xref: /kvm-unit-tests/x86/svm_tests.c (revision bbafc57767378873e7cc49183082797489fba592)

#include "svm.h"
#include "libcflat.h"
#include "processor.h"
#include "desc.h"
#include "msr.h"
#include "vm.h"
#include "smp.h"
#include "alloc_page.h"
#include "isr.h"
#include "apic.h"
#include "delay.h"
#include "util.h"
#include "x86/usermode.h"
#include "vmalloc.h"

#define SVM_EXIT_MAX_DR_INTERCEPT 0x3f

#define LATENCY_RUNS 1000000

u64 tsc_start;
u64 tsc_end;

u64 vmrun_sum, vmexit_sum;
u64 vmsave_sum, vmload_sum;
u64 stgi_sum, clgi_sum;
u64 latvmrun_max;
u64 latvmrun_min;
u64 latvmexit_max;
u64 latvmexit_min;
u64 latvmload_max;
u64 latvmload_min;
u64 latvmsave_max;
u64 latvmsave_min;
u64 latstgi_max;
u64 latstgi_min;
u64 latclgi_max;
u64 latclgi_min;
u64 runs;

static void null_test(struct svm_test *test)
{
}

static bool null_check(struct svm_test *test)
{
	return vmcb->control.exit_code == SVM_EXIT_VMMCALL;
}

static void prepare_no_vmrun_int(struct svm_test *test)
{
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMRUN);
}

static bool check_no_vmrun_int(struct svm_test *test)
{
	return vmcb->control.exit_code == SVM_EXIT_ERR;
}

static void test_vmrun(struct svm_test *test)
{
	asm volatile ("vmrun %0" : : "a"(virt_to_phys(vmcb)));
}

static bool check_vmrun(struct svm_test *test)
{
	return vmcb->control.exit_code == SVM_EXIT_VMRUN;
}

static void prepare_rsm_intercept(struct svm_test *test)
{
	default_prepare(test);
	vmcb->control.intercept |= 1 << INTERCEPT_RSM;
	vmcb->control.intercept_exceptions |= (1ULL << UD_VECTOR);
}

static void test_rsm_intercept(struct svm_test *test)
{
	asm volatile ("rsm" : : : "memory");
}

static bool check_rsm_intercept(struct svm_test *test)
{
	return get_test_stage(test) == 2;
}

static bool finished_rsm_intercept(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_RSM) {
			report_fail("VMEXIT not due to rsm. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->control.intercept &= ~(1 << INTERCEPT_RSM);
		inc_test_stage(test);
		break;

	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_EXCP_BASE + UD_VECTOR) {
			report_fail("VMEXIT not due to #UD. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 2;
		inc_test_stage(test);
		break;

	default:
		return true;
	}
	return get_test_stage(test) == 2;
}

static void prepare_cr3_intercept(struct svm_test *test)
{
	default_prepare(test);
	vmcb->control.intercept_cr_read |= 1 << 3;
}

static void test_cr3_intercept(struct svm_test *test)
{
	asm volatile ("mov %%cr3, %0" : "=r"(test->scratch) : : "memory");
}

static bool check_cr3_intercept(struct svm_test *test)
{
	return vmcb->control.exit_code == SVM_EXIT_READ_CR3;
}

static bool check_cr3_nointercept(struct svm_test *test)
{
	return null_check(test) && test->scratch == read_cr3();
}

static void corrupt_cr3_intercept_bypass(void *_test)
{
	struct svm_test *test = _test;
	extern volatile u32 mmio_insn;

	while (!__sync_bool_compare_and_swap(&test->scratch, 1, 2))
		pause();
	pause();
	pause();
	pause();
	mmio_insn = 0x90d8200f;  // mov %cr3, %rax; nop
}

static void prepare_cr3_intercept_bypass(struct svm_test *test)
{
	default_prepare(test);
	vmcb->control.intercept_cr_read |= 1 << 3;
	on_cpu_async(1, corrupt_cr3_intercept_bypass, test);
}

static void test_cr3_intercept_bypass(struct svm_test *test)
{
	ulong a = 0xa0000;

	test->scratch = 1;
	while (test->scratch != 2)
		barrier();

	asm volatile ("mmio_insn: mov %0, (%0); nop"
		      : "+a"(a) : : "memory");
	test->scratch = a;
}

static void prepare_dr_intercept(struct svm_test *test)
{
	default_prepare(test);
	vmcb->control.intercept_dr_read = 0xff;
	vmcb->control.intercept_dr_write = 0xff;
}

static void test_dr_intercept(struct svm_test *test)
{
	unsigned int i, failcnt = 0;

	/* Loop testing debug register reads */
	for (i = 0; i < 8; i++) {

		switch (i) {
		case 0:
			asm volatile ("mov %%dr0, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 1:
			asm volatile ("mov %%dr1, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 2:
			asm volatile ("mov %%dr2, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 3:
			asm volatile ("mov %%dr3, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 4:
			asm volatile ("mov %%dr4, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 5:
			asm volatile ("mov %%dr5, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 6:
			asm volatile ("mov %%dr6, %0" : "=r"(test->scratch) : : "memory");
			break;
		case 7:
			asm volatile ("mov %%dr7, %0" : "=r"(test->scratch) : : "memory");
			break;
		}

		if (test->scratch != i) {
			report_fail("dr%u read intercept", i);
			failcnt++;
		}
	}

	/* Loop testing debug register writes */
	for (i = 0; i < 8; i++) {

		switch (i) {
		case 0:
			asm volatile ("mov %0, %%dr0" : : "r"(test->scratch) : "memory");
			break;
		case 1:
			asm volatile ("mov %0, %%dr1" : : "r"(test->scratch) : "memory");
			break;
		case 2:
			asm volatile ("mov %0, %%dr2" : : "r"(test->scratch) : "memory");
			break;
		case 3:
			asm volatile ("mov %0, %%dr3" : : "r"(test->scratch) : "memory");
			break;
		case 4:
			asm volatile ("mov %0, %%dr4" : : "r"(test->scratch) : "memory");
			break;
		case 5:
			asm volatile ("mov %0, %%dr5" : : "r"(test->scratch) : "memory");
			break;
		case 6:
			asm volatile ("mov %0, %%dr6" : : "r"(test->scratch) : "memory");
			break;
		case 7:
			asm volatile ("mov %0, %%dr7" : : "r"(test->scratch) : "memory");
			break;
		}

		if (test->scratch != i) {
			report_fail("dr%u write intercept", i);
			failcnt++;
		}
	}

	test->scratch = failcnt;
}

static bool dr_intercept_finished(struct svm_test *test)
{
	ulong n = (vmcb->control.exit_code - SVM_EXIT_READ_DR0);

	/* Only expect DR intercepts */
	if (n > (SVM_EXIT_MAX_DR_INTERCEPT - SVM_EXIT_READ_DR0))
		return true;

	/*
	 * Compute debug register number.
	 * Per Appendix C "SVM Intercept Exit Codes" of AMD64 Architecture
	 * Programmer's Manual Volume 2 - System Programming:
	 * http://support.amd.com/TechDocs/24593.pdf
	 * there are 16 VMEXIT codes each for DR read and write.
	 */
	test->scratch = (n % 16);

	/* Jump over MOV instruction */
	vmcb->save.rip += 3;

	return false;
}

static bool check_dr_intercept(struct svm_test *test)
{
	return !test->scratch;
}

static bool next_rip_supported(void)
{
	return this_cpu_has(X86_FEATURE_NRIPS);
}

static void prepare_next_rip(struct svm_test *test)
{
	vmcb->control.intercept |= (1ULL << INTERCEPT_RDTSC);
}


static void test_next_rip(struct svm_test *test)
{
	asm volatile ("rdtsc\n\t"
		      ".globl exp_next_rip\n\t"
		      "exp_next_rip:\n\t" ::: "eax", "edx");
}

static bool check_next_rip(struct svm_test *test)
{
	extern char exp_next_rip;
	unsigned long address = (unsigned long)&exp_next_rip;

	return address == vmcb->control.next_rip;
}

extern u8 *msr_bitmap;

static bool is_x2apic;

static void prepare_msr_intercept(struct svm_test *test)
{
	default_prepare(test);
	vmcb->control.intercept |= (1ULL << INTERCEPT_MSR_PROT);

	memset(msr_bitmap, 0, MSR_BITMAP_SIZE);

	is_x2apic = is_x2apic_enabled();
}

#define SVM_MSRPM_BYTES_PER_RANGE 2048
#define SVM_BITS_PER_MSR 2
#define SVM_MSRS_PER_BYTE 4
#define SVM_MSRS_PER_RANGE 8192
#define SVM_MSRPM_OFFSET_MASK (SVM_MSRS_PER_RANGE - 1)

static int get_msrpm_bit_nr(u32 msr)
{
	int range_nr;

	switch (msr & ~SVM_MSRPM_OFFSET_MASK) {
	case 0:
		range_nr = 0;
		break;
	case 0xc0000000:
		range_nr = 1;
		break;
	case 0xc0010000:
		range_nr = 2;
		break;
	default:
		return - 1;
	}

	return range_nr * SVM_MSRPM_BYTES_PER_RANGE * BITS_PER_BYTE +
	       (msr & SVM_MSRPM_OFFSET_MASK) * SVM_BITS_PER_MSR;
}

static void __test_msr_intercept(struct svm_test *test)
{
	u64 val, exp, arb_val = 0xef8056791234abcd; /* Arbitrary value */
	int vector;
	u32 msr;

	for (msr = 0; msr <= 0xc0012000; msr++) {
		if (msr == 0xC0010131 /* MSR_SEV_STATUS */) {
			/*
			 * Per section 15.34.10 "SEV_STATUS MSR" of AMD64 Architecture
			 * Programmer's Manual volume 2 - System Programming:
			 * http://support.amd.com/TechDocs/24593.pdf
			 * SEV_STATUS MSR (C001_0131) is a non-interceptable MSR.
			 */
			continue;
		}

		/*
		 * Test one MSR just before and after each range, but otherwise
		 * skips gaps between supported MSR ranges.
		 */
		if (msr == 0x2000 + 1)
			msr = 0xc0000000 - 1;
		else if (msr == 0xc0002000 + 1)
			msr = 0xc0010000 - 1;

		test->scratch = msr;
		vmmcall();

		test->scratch = -1;

		vector = rdmsr_safe(msr, &val);
		if (vector)
			report_fail("Expected RDMSR(0x%x) to #VMEXIT, got exception '%u'",
				    msr, vector);
		else if (test->scratch != msr)
			report_fail("Expected RDMSR(0x%x) to #VMEXIT, got scratch '%ld",
				    msr, test->scratch);

		test->scratch = BIT_ULL(32) | msr;
		vmmcall();

		/*
		 * Poor man approach to generate a value that
		 * seems arbitrary each time around the loop.
		 */
		arb_val += (arb_val << 1);

		test->scratch = -1;

		vector = wrmsr_safe(msr, arb_val);
		if (vector)
			report_fail("Expected WRMSR(0x%x) to #VMEXIT, got exception '%u'",
				    msr, vector);
		else if (test->scratch != arb_val)
			report_fail("Expected WRMSR(0x%x) to #VMEXIT, got scratch '%ld' (wanted %ld)",
				    msr, test->scratch, arb_val);

		test->scratch = BIT_ULL(33) | msr;
		vmmcall();

		if (get_msrpm_bit_nr(msr) < 0) {
			report(msr == 0x2000 ||
			       msr == 0xc0000000 - 1 || msr == 0xc0002000 ||
			       msr == 0xc0010000 - 1 || msr == 0xc0012000,
			       "MSR 0x%x not covered by an MSRPM range", msr);
			continue;
		}

		exp = test->scratch;

		/*
		 * Verify that disabling interception for MSRs within an MSRPM
		 * range behaves as expected.  Simply eat exceptions, the goal
		 * is to verify interception, not MSR emulation/virtualization.
		 */
		test->scratch = -1;
		(void)rdmsr_safe(msr, &val);
		if (test->scratch != -1)
			report_fail("RDMSR 0x%x, Wanted -1 (no intercept), got 0x%lx",
				    msr, test->scratch);

		/*
		 * Verify L1 and L2 see the same MSR value.  Skip TSC to avoid
		 * false failures, as it's constantly changing.
		 */
		if (val != exp && msr != MSR_IA32_TSC)
			report_fail("RDMSR 0x%x, wanted val '0%lx', got val '0x%lx'",
				    msr, exp, val);

		test->scratch = BIT_ULL(34) | msr;
		vmmcall();

		test->scratch = -1;
		(void)wrmsr_safe(msr, val);
		if (test->scratch != -1)
			report_fail("WRMSR 0x%x, Wanted -1 (no intercept), got 0x%lx",
				    msr, test->scratch);

		test->scratch = BIT_ULL(35) | msr;
		vmmcall();
	}
}

static void test_msr_intercept(struct svm_test *test)
{
	__test_msr_intercept(test);

	test->scratch = -2;
	vmmcall();

	__test_msr_intercept(test);

	test->scratch = -3;
}

static void restore_msrpm_bit(int bit_nr, bool set)
{
	if (set)
		__set_bit(bit_nr, msr_bitmap);
	else
		__clear_bit(bit_nr, msr_bitmap);
}

static bool msr_intercept_finished(struct svm_test *test)
{
	u32 exit_code = vmcb->control.exit_code;
	bool all_set = false;
	int bit_nr;

	if (exit_code == SVM_EXIT_VMMCALL) {
		u32 msr = test->scratch & -1u;

		vmcb->save.rip += 3;

		if (test->scratch == -3)
			return true;

		if (test->scratch == -2) {
			all_set = true;
			memset(msr_bitmap, 0xff, MSR_BITMAP_SIZE);
			return false;
		}

		bit_nr = get_msrpm_bit_nr(msr);
		if (bit_nr < 0)
			return false;

		switch (test->scratch >> 32) {
		case 0:
			__set_bit(bit_nr, msr_bitmap);
			return false;
		case 1:
			restore_msrpm_bit(bit_nr, all_set);
			__set_bit(bit_nr + 1, msr_bitmap);
			return false;
		case 2:
			restore_msrpm_bit(bit_nr + 1, all_set);
			__clear_bit(bit_nr, msr_bitmap);
			(void)rdmsr_safe(msr, &test->scratch);
			return false;
		case 4:
			restore_msrpm_bit(bit_nr, all_set);
			__clear_bit(bit_nr + 1, msr_bitmap);
			/*
			 * Disable x2APIC so that WRMSR faults instead of doing
			 * random things, e.g. sending IPIs.
			 */
			if (is_x2apic && msr >= 0x800 && msr <= 0x8ff)
				reset_apic();
			return false;
		case 8:
			restore_msrpm_bit(bit_nr + 1, all_set);
			if (is_x2apic && msr >= 0x800 && msr <= 0x8ff)
				enable_x2apic();
			return false;
		default:
			return true;
		}
	}

	if (exit_code != SVM_EXIT_MSR) {
		report_fail("Wanted MSR VM-Exit, got reason 0x%x", exit_code);
		return true;
	}

	/* Jump over RDMSR/WRMSR instruction */
	vmcb->save.rip += 2;

	/*
	 * Test whether the intercept was for RDMSR/WRMSR.
	 * For RDMSR, test->scratch is set to the MSR index;
	 *      RCX holds the MSR index.
	 * For WRMSR, test->scratch is set to the MSR value;
	 *      RDX holds the upper 32 bits of the MSR value,
	 *      while RAX hold its lower 32 bits.
	 */
	if (vmcb->control.exit_info_1)
		test->scratch = ((get_regs().rdx << 32) | (vmcb->save.rax & 0xffffffff));
	else
		test->scratch = get_regs().rcx;

	return false;
}

static bool check_msr_intercept(struct svm_test *test)
{
	return (test->scratch == -3);
}

static void prepare_mode_switch(struct svm_test *test)
{
	vmcb->control.intercept_exceptions |= (1ULL << GP_VECTOR)
		|  (1ULL << UD_VECTOR)
		|  (1ULL << DF_VECTOR)
		|  (1ULL << PF_VECTOR);
	test->scratch = 0;
}

static void test_mode_switch(struct svm_test *test)
{
	asm volatile("	cli\n"
		     "	ljmp *1f\n" /* jump to 32-bit code segment */
		     "1:\n"
		     "	.long 2f\n"
		     "	.long " xstr(KERNEL_CS32) "\n"
		     ".code32\n"
		     "2:\n"
		     "	movl %%cr0, %%eax\n"
		     "	btcl  $31, %%eax\n" /* clear PG */
		     "	movl %%eax, %%cr0\n"
		     "	movl $0xc0000080, %%ecx\n" /* EFER */
		     "	rdmsr\n"
		     "	btcl $8, %%eax\n" /* clear LME */
		     "	wrmsr\n"
		     "	movl %%cr4, %%eax\n"
		     "	btcl $5, %%eax\n" /* clear PAE */
		     "	movl %%eax, %%cr4\n"
		     "	movw %[ds16], %%ax\n"
		     "	movw %%ax, %%ds\n"
		     "	ljmpl %[cs16], $3f\n" /* jump to 16 bit protected-mode */
		     ".code16\n"
		     "3:\n"
		     "	movl %%cr0, %%eax\n"
		     "	btcl $0, %%eax\n" /* clear PE  */
		     "	movl %%eax, %%cr0\n"
		     "	ljmpl $0, $4f\n"   /* jump to real-mode */
		     "4:\n"
		     "	vmmcall\n"
		     "	movl %%cr0, %%eax\n"
		     "	btsl $0, %%eax\n" /* set PE  */
		     "	movl %%eax, %%cr0\n"
		     "	ljmpl %[cs32], $5f\n" /* back to protected mode */
		     ".code32\n"
		     "5:\n"
		     "	movl %%cr4, %%eax\n"
		     "	btsl $5, %%eax\n" /* set PAE */
		     "	movl %%eax, %%cr4\n"
		     "	movl $0xc0000080, %%ecx\n" /* EFER */
		     "	rdmsr\n"
		     "	btsl $8, %%eax\n" /* set LME */
		     "	wrmsr\n"
		     "	movl %%cr0, %%eax\n"
		     "	btsl  $31, %%eax\n" /* set PG */
		     "	movl %%eax, %%cr0\n"
		     "	ljmpl %[cs64], $6f\n"    /* back to long mode */
		     ".code64\n\t"
		     "6:\n"
		     "	vmmcall\n"
		     :: [cs16] "i"(KERNEL_CS16), [ds16] "i"(KERNEL_DS16),
		      [cs32] "i"(KERNEL_CS32), [cs64] "i"(KERNEL_CS64)
		     : "rax", "rbx", "rcx", "rdx", "memory");
}

static bool mode_switch_finished(struct svm_test *test)
{
	u64 cr0, cr4, efer;

	cr0  = vmcb->save.cr0;
	cr4  = vmcb->save.cr4;
	efer = vmcb->save.efer;

	/* Only expect VMMCALL intercepts */
	if (vmcb->control.exit_code != SVM_EXIT_VMMCALL)
		return true;

	/* Jump over VMMCALL instruction */
	vmcb->save.rip += 3;

	/* Do sanity checks */
	switch (test->scratch) {
	case 0:
		/* Test should be in real mode now - check for this */
		if ((cr0  & 0x80000001) || /* CR0.PG, CR0.PE */
		    (cr4  & 0x00000020) || /* CR4.PAE */
		    (efer & 0x00000500))   /* EFER.LMA, EFER.LME */
			return true;
		break;
	case 2:
		/* Test should be back in long-mode now - check for this */
		if (((cr0  & 0x80000001) != 0x80000001) || /* CR0.PG, CR0.PE */
		    ((cr4  & 0x00000020) != 0x00000020) || /* CR4.PAE */
		    ((efer & 0x00000500) != 0x00000500))   /* EFER.LMA, EFER.LME */
			return true;
		break;
	}

	/* one step forward */
	test->scratch += 1;

	return test->scratch == 2;
}

static bool check_mode_switch(struct svm_test *test)
{
	return test->scratch == 2;
}

extern u8 *io_bitmap;

static void prepare_ioio(struct svm_test *test)
{
	vmcb->control.intercept |= (1ULL << INTERCEPT_IOIO_PROT);
	test->scratch = 0;
	memset(io_bitmap, 0, 8192);
	io_bitmap[8192] = 0xFF;
}

static void test_ioio(struct svm_test *test)
{
	// stage 0, test IO pass
	inb(0x5000);
	outb(0x0, 0x5000);
	if (get_test_stage(test) != 0)
		goto fail;

	// test IO width, in/out
	io_bitmap[0] = 0xFF;
	inc_test_stage(test);
	inb(0x0);
	if (get_test_stage(test) != 2)
		goto fail;

	outw(0x0, 0x0);
	if (get_test_stage(test) != 3)
		goto fail;

	inl(0x0);
	if (get_test_stage(test) != 4)
		goto fail;

	// test low/high IO port
	io_bitmap[0x5000 / 8] = (1 << (0x5000 % 8));
	inb(0x5000);
	if (get_test_stage(test) != 5)
		goto fail;

	io_bitmap[0x9000 / 8] = (1 << (0x9000 % 8));
	inw(0x9000);
	if (get_test_stage(test) != 6)
		goto fail;

	// test partial pass
	io_bitmap[0x5000 / 8] = (1 << (0x5000 % 8));
	inl(0x4FFF);
	if (get_test_stage(test) != 7)
		goto fail;

	// test across pages
	inc_test_stage(test);
	inl(0x7FFF);
	if (get_test_stage(test) != 8)
		goto fail;

	inc_test_stage(test);
	io_bitmap[0x8000 / 8] = 1 << (0x8000 % 8);
	inl(0x7FFF);
	if (get_test_stage(test) != 10)
		goto fail;

	io_bitmap[0] = 0;
	inl(0xFFFF);
	if (get_test_stage(test) != 11)
		goto fail;

	io_bitmap[0] = 0xFF;
	io_bitmap[8192] = 0;
	inl(0xFFFF);
	inc_test_stage(test);
	if (get_test_stage(test) != 12)
		goto fail;

	return;

fail:
	report_fail("stage %d", get_test_stage(test));
	test->scratch = -1;
}

static bool ioio_finished(struct svm_test *test)
{
	unsigned port, size;

	/* Only expect IOIO intercepts */
	if (vmcb->control.exit_code == SVM_EXIT_VMMCALL)
		return true;

	if (vmcb->control.exit_code != SVM_EXIT_IOIO)
		return true;

	/* one step forward */
	test->scratch += 1;

	port = vmcb->control.exit_info_1 >> 16;
	size = (vmcb->control.exit_info_1 >> SVM_IOIO_SIZE_SHIFT) & 7;

	while (size--) {
		io_bitmap[port / 8] &= ~(1 << (port & 7));
		port++;
	}

	return false;
}

static bool check_ioio(struct svm_test *test)
{
	memset(io_bitmap, 0, 8193);
	return test->scratch != -1;
}

static void prepare_asid_zero(struct svm_test *test)
{
	vmcb->control.asid = 0;
}

static void test_asid_zero(struct svm_test *test)
{
	asm volatile ("vmmcall\n\t");
}

static bool check_asid_zero(struct svm_test *test)
{
	return vmcb->control.exit_code == SVM_EXIT_ERR;
}

static void sel_cr0_bug_prepare(struct svm_test *test)
{
	vmcb->control.intercept |= (1ULL << INTERCEPT_SELECTIVE_CR0);
}

static bool sel_cr0_bug_finished(struct svm_test *test)
{
	return true;
}

static void sel_cr0_bug_test(struct svm_test *test)
{
	unsigned long cr0;

	/* read cr0, clear CD, and write back */
	cr0  = read_cr0();
	cr0 |= (1UL << 30);
	write_cr0(cr0);

	/*
	 * If we are here the test failed, not sure what to do now because we
	 * are not in guest-mode anymore so we can't trigger an intercept.
	 * Trigger a tripple-fault for now.
	 */
	report_fail("sel_cr0 test. Can not recover from this - exiting");
	exit(report_summary());
}

static bool sel_cr0_bug_check(struct svm_test *test)
{
	return vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE;
}

#define TSC_ADJUST_VALUE    (1ll << 32)
#define TSC_OFFSET_VALUE    (~0ull << 48)
static bool ok;

static bool tsc_adjust_supported(void)
{
	return this_cpu_has(X86_FEATURE_TSC_ADJUST);
}

static void tsc_adjust_prepare(struct svm_test *test)
{
	default_prepare(test);
	vmcb->control.tsc_offset = TSC_OFFSET_VALUE;

	wrmsr(MSR_IA32_TSC_ADJUST, -TSC_ADJUST_VALUE);
	int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST);
	ok = adjust == -TSC_ADJUST_VALUE;
}

static void tsc_adjust_test(struct svm_test *test)
{
	int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST);
	ok &= adjust == -TSC_ADJUST_VALUE;

	uint64_t l1_tsc = rdtsc() - TSC_OFFSET_VALUE;
	wrmsr(MSR_IA32_TSC, l1_tsc - TSC_ADJUST_VALUE);

	adjust = rdmsr(MSR_IA32_TSC_ADJUST);
	ok &= adjust <= -2 * TSC_ADJUST_VALUE;

	uint64_t l1_tsc_end = rdtsc() - TSC_OFFSET_VALUE;
	ok &= (l1_tsc_end + TSC_ADJUST_VALUE - l1_tsc) < TSC_ADJUST_VALUE;

	uint64_t l1_tsc_msr = rdmsr(MSR_IA32_TSC) - TSC_OFFSET_VALUE;
	ok &= (l1_tsc_msr + TSC_ADJUST_VALUE - l1_tsc) < TSC_ADJUST_VALUE;
}

static bool tsc_adjust_check(struct svm_test *test)
{
	int64_t adjust = rdmsr(MSR_IA32_TSC_ADJUST);

	wrmsr(MSR_IA32_TSC_ADJUST, 0);
	return ok && adjust <= -2 * TSC_ADJUST_VALUE;
}


static u64 guest_tsc_delay_value;
/* number of bits to shift tsc right for stable result */
#define TSC_SHIFT 24
#define TSC_SCALE_ITERATIONS 10

static void svm_tsc_scale_guest(struct svm_test *test)
{
	u64 start_tsc = rdtsc();

	while (rdtsc() - start_tsc < guest_tsc_delay_value)
		cpu_relax();
}

static void svm_tsc_scale_run_testcase(u64 duration,
				       double tsc_scale, u64 tsc_offset)
{
	u64 start_tsc, actual_duration;

	guest_tsc_delay_value = (duration << TSC_SHIFT) * tsc_scale;

	test_set_guest(svm_tsc_scale_guest);
	vmcb->control.tsc_offset = tsc_offset;
	wrmsr(MSR_AMD64_TSC_RATIO, (u64)(tsc_scale * (1ULL << 32)));

	start_tsc = rdtsc();

	if (svm_vmrun() != SVM_EXIT_VMMCALL)
		report_fail("unexpected vm exit code 0x%x", vmcb->control.exit_code);

	actual_duration = (rdtsc() - start_tsc) >> TSC_SHIFT;

	report(duration == actual_duration, "tsc delay (expected: %lu, actual: %lu)",
	       duration, actual_duration);
}

static void svm_tsc_scale_test(void)
{
	int i;

	if (!tsc_scale_supported()) {
		report_skip("TSC scale not supported in the guest");
		return;
	}

	report(rdmsr(MSR_AMD64_TSC_RATIO) == TSC_RATIO_DEFAULT,
	       "initial TSC scale ratio");

	for (i = 0 ; i < TSC_SCALE_ITERATIONS; i++) {

		double tsc_scale = (double)(rdrand() % 100 + 1) / 10;
		int duration = rdrand() % 50 + 1;
		u64 tsc_offset = rdrand();

		report_info("duration=%d, tsc_scale=%d, tsc_offset=%ld",
			    duration, (int)(tsc_scale * 100), tsc_offset);

		svm_tsc_scale_run_testcase(duration, tsc_scale, tsc_offset);
	}

	svm_tsc_scale_run_testcase(50, 255, rdrand());
	svm_tsc_scale_run_testcase(50, 0.0001, rdrand());
}

static void latency_prepare(struct svm_test *test)
{
	default_prepare(test);
	runs = LATENCY_RUNS;
	latvmrun_min = latvmexit_min = -1ULL;
	latvmrun_max = latvmexit_max = 0;
	vmrun_sum = vmexit_sum = 0;
	tsc_start = rdtsc();
}

static void latency_test(struct svm_test *test)
{
	u64 cycles;

start:
	tsc_end = rdtsc();

	cycles = tsc_end - tsc_start;

	if (cycles > latvmrun_max)
		latvmrun_max = cycles;

	if (cycles < latvmrun_min)
		latvmrun_min = cycles;

	vmrun_sum += cycles;

	tsc_start = rdtsc();

	asm volatile ("vmmcall" : : : "memory");
	goto start;
}

static bool latency_finished(struct svm_test *test)
{
	u64 cycles;

	tsc_end = rdtsc();

	cycles = tsc_end - tsc_start;

	if (cycles > latvmexit_max)
		latvmexit_max = cycles;

	if (cycles < latvmexit_min)
		latvmexit_min = cycles;

	vmexit_sum += cycles;

	vmcb->save.rip += 3;

	runs -= 1;

	tsc_end = rdtsc();

	return runs == 0;
}

static bool latency_finished_clean(struct svm_test *test)
{
	vmcb->control.clean = VMCB_CLEAN_ALL;
	return latency_finished(test);
}

static bool latency_check(struct svm_test *test)
{
	printf("    Latency VMRUN : max: %ld min: %ld avg: %ld\n", latvmrun_max,
	       latvmrun_min, vmrun_sum / LATENCY_RUNS);
	printf("    Latency VMEXIT: max: %ld min: %ld avg: %ld\n", latvmexit_max,
	       latvmexit_min, vmexit_sum / LATENCY_RUNS);
	return true;
}

static void lat_svm_insn_prepare(struct svm_test *test)
{
	default_prepare(test);
	runs = LATENCY_RUNS;
	latvmload_min = latvmsave_min = latstgi_min = latclgi_min = -1ULL;
	latvmload_max = latvmsave_max = latstgi_max = latclgi_max = 0;
	vmload_sum = vmsave_sum = stgi_sum = clgi_sum;
}

static bool lat_svm_insn_finished(struct svm_test *test)
{
	u64 vmcb_phys = virt_to_phys(vmcb);
	u64 cycles;

	for ( ; runs != 0; runs--) {
		tsc_start = rdtsc();
		asm volatile("vmload %0\n\t" : : "a"(vmcb_phys) : "memory");
		cycles = rdtsc() - tsc_start;
		if (cycles > latvmload_max)
			latvmload_max = cycles;
		if (cycles < latvmload_min)
			latvmload_min = cycles;
		vmload_sum += cycles;

		tsc_start = rdtsc();
		asm volatile("vmsave %0\n\t" : : "a"(vmcb_phys) : "memory");
		cycles = rdtsc() - tsc_start;
		if (cycles > latvmsave_max)
			latvmsave_max = cycles;
		if (cycles < latvmsave_min)
			latvmsave_min = cycles;
		vmsave_sum += cycles;

		tsc_start = rdtsc();
		asm volatile("stgi\n\t");
		cycles = rdtsc() - tsc_start;
		if (cycles > latstgi_max)
			latstgi_max = cycles;
		if (cycles < latstgi_min)
			latstgi_min = cycles;
		stgi_sum += cycles;

		tsc_start = rdtsc();
		asm volatile("clgi\n\t");
		cycles = rdtsc() - tsc_start;
		if (cycles > latclgi_max)
			latclgi_max = cycles;
		if (cycles < latclgi_min)
			latclgi_min = cycles;
		clgi_sum += cycles;
	}

	tsc_end = rdtsc();

	return true;
}

static bool lat_svm_insn_check(struct svm_test *test)
{
	printf("    Latency VMLOAD: max: %ld min: %ld avg: %ld\n", latvmload_max,
	       latvmload_min, vmload_sum / LATENCY_RUNS);
	printf("    Latency VMSAVE: max: %ld min: %ld avg: %ld\n", latvmsave_max,
	       latvmsave_min, vmsave_sum / LATENCY_RUNS);
	printf("    Latency STGI:   max: %ld min: %ld avg: %ld\n", latstgi_max,
	       latstgi_min, stgi_sum / LATENCY_RUNS);
	printf("    Latency CLGI:   max: %ld min: %ld avg: %ld\n", latclgi_max,
	       latclgi_min, clgi_sum / LATENCY_RUNS);
	return true;
}

/*
 * Report failures from SVM guest code, and on failure, set the stage to -1 and
 * do VMMCALL to terminate the test (host side must treat -1 as "finished").
 * TODO: fix the tests that don't play nice with a straight report, e.g. the
 * V_TPR test fails if report() is invoked.
 */
#define report_svm_guest(cond, test, fmt, args...)	\
do {							\
	if (!(cond)) {					\
		report_fail(fmt, ##args);		\
		set_test_stage(test, -1);		\
		vmmcall();				\
	}						\
} while (0)

bool pending_event_ipi_fired;
bool pending_event_guest_run;

static void pending_event_ipi_isr(isr_regs_t *regs)
{
	pending_event_ipi_fired = true;
	eoi();
}

static void pending_event_prepare(struct svm_test *test)
{
	int ipi_vector = 0xf1;

	default_prepare(test);

	pending_event_ipi_fired = false;

	handle_irq(ipi_vector, pending_event_ipi_isr);

	pending_event_guest_run = false;

	vmcb->control.intercept |= (1ULL << INTERCEPT_INTR);
	vmcb->control.int_ctl |= V_INTR_MASKING_MASK;

	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL |
		       APIC_DM_FIXED | ipi_vector, 0);

	set_test_stage(test, 0);
}

static void pending_event_test(struct svm_test *test)
{
	pending_event_guest_run = true;
}

static bool pending_event_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_INTR) {
			report_fail("VMEXIT not due to pending interrupt. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}

		vmcb->control.intercept &= ~(1ULL << INTERCEPT_INTR);
		vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;

		if (pending_event_guest_run) {
			report_fail("Guest ran before host received IPI\n");
			return true;
		}

		sti_nop_cli();

		if (!pending_event_ipi_fired) {
			report_fail("Pending interrupt not dispatched after IRQ enabled\n");
			return true;
		}
		break;

	case 1:
		if (!pending_event_guest_run) {
			report_fail("Guest did not resume when no interrupt\n");
			return true;
		}
		break;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 2;
}

static bool pending_event_check(struct svm_test *test)
{
	return get_test_stage(test) == 2;
}

static void pending_event_cli_prepare(struct svm_test *test)
{
	default_prepare(test);

	pending_event_ipi_fired = false;

	handle_irq(0xf1, pending_event_ipi_isr);

	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL |
		       APIC_DM_FIXED | 0xf1, 0);

	set_test_stage(test, 0);
}

static void pending_event_cli_prepare_gif_clear(struct svm_test *test)
{
	asm("cli");
}

static void pending_event_cli_test(struct svm_test *test)
{
	report_svm_guest(!pending_event_ipi_fired, test,
			 "IRQ should NOT be delivered while IRQs disabled");

	/* VINTR_MASKING is zero.  This should cause the IPI to fire.  */
	sti_nop_cli();

	report_svm_guest(pending_event_ipi_fired, test,
			 "IRQ should be delivered after enabling IRQs");
	vmmcall();

	/*
	 * Now VINTR_MASKING=1, but no interrupt is pending so
	 * the VINTR interception should be clear in VMCB02.  Check
	 * that L0 did not leave a stale VINTR in the VMCB.
	 */
	sti_nop_cli();
}

static bool pending_event_cli_finished(struct svm_test *test)
{
	report_svm_guest(vmcb->control.exit_code == SVM_EXIT_VMMCALL, test,
			 "Wanted VMMCALL VM-Exit, got exit reason 0x%x",
			 vmcb->control.exit_code);

	switch (get_test_stage(test)) {
	case 0:
		vmcb->save.rip += 3;

		pending_event_ipi_fired = false;

		vmcb->control.int_ctl |= V_INTR_MASKING_MASK;

		/* Now entering again with VINTR_MASKING=1.  */
		apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL |
			       APIC_DM_FIXED | 0xf1, 0);

		break;

	case 1:
		if (pending_event_ipi_fired == true) {
			report_fail("Interrupt triggered by guest");
			return true;
		}

		sti_nop_cli();

		if (pending_event_ipi_fired != true) {
			report_fail("Interrupt not triggered by host");
			return true;
		}

		break;

	default:
		return true;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 2;
}

static bool pending_event_cli_check(struct svm_test *test)
{
	return get_test_stage(test) == 2;
}

#define TIMER_VECTOR    222

static volatile bool timer_fired;

static void timer_isr(isr_regs_t *regs)
{
	timer_fired = true;
	apic_write(APIC_EOI, 0);
}

static void interrupt_prepare(struct svm_test *test)
{
	default_prepare(test);
	handle_irq(TIMER_VECTOR, timer_isr);
	timer_fired = false;
	set_test_stage(test, 0);
}

static void interrupt_test(struct svm_test *test)
{
	long long start, loops;

	apic_setup_timer(TIMER_VECTOR, APIC_LVT_TIMER_PERIODIC);
	sti();
	apic_start_timer(1000);

	for (loops = 0; loops < 10000000 && !timer_fired; loops++)
		asm volatile ("nop");

	report_svm_guest(timer_fired, test,
			 "direct interrupt while running guest");

	apic_stop_timer();
	cli();
	vmmcall();

	timer_fired = false;
	apic_start_timer(1000);
	for (loops = 0; loops < 10000000 && !timer_fired; loops++)
		asm volatile ("nop");

	report_svm_guest(timer_fired, test,
			 "intercepted interrupt while running guest");

	sti();
	apic_stop_timer();
	cli();

	timer_fired = false;
	start = rdtsc();
	apic_start_timer(1000000);
	safe_halt();

	report_svm_guest(timer_fired, test, "direct interrupt + hlt");
	report(rdtsc() - start > 10000, "IRQ arrived after expected delay");

	apic_stop_timer();
	cli();
	vmmcall();

	timer_fired = false;
	start = rdtsc();
	apic_start_timer(1000000);
	asm volatile ("hlt");

	report_svm_guest(timer_fired, test, "intercepted interrupt + hlt");
	report(rdtsc() - start > 10000, "IRQ arrived after expected delay");

	apic_cleanup_timer();
}

static bool interrupt_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
	case 2:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;

		vmcb->control.intercept |= (1ULL << INTERCEPT_INTR);
		vmcb->control.int_ctl |= V_INTR_MASKING_MASK;
		break;

	case 1:
	case 3:
		if (vmcb->control.exit_code != SVM_EXIT_INTR) {
			report_fail("VMEXIT not due to intr intercept. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}

		sti_nop_cli();

		vmcb->control.intercept &= ~(1ULL << INTERCEPT_INTR);
		vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
		break;

	case 4:
		break;

	default:
		return true;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 5;
}

static bool interrupt_check(struct svm_test *test)
{
	return get_test_stage(test) == 5;
}

static volatile bool nmi_fired;

static void nmi_handler(struct ex_regs *regs)
{
	nmi_fired = true;
}

static void nmi_prepare(struct svm_test *test)
{
	default_prepare(test);
	nmi_fired = false;
	handle_exception(NMI_VECTOR, nmi_handler);
	set_test_stage(test, 0);
}

static void nmi_test(struct svm_test *test)
{
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, 0);

	report_svm_guest(nmi_fired, test, "direct NMI while running guest");

	vmmcall();

	nmi_fired = false;

	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, 0);

	report_svm_guest(nmi_fired, test, "intercepted pending NMI delivered to guest");
}

static bool nmi_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;

		vmcb->control.intercept |= (1ULL << INTERCEPT_NMI);
		break;

	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_NMI) {
			report_fail("VMEXIT not due to NMI intercept. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}

		report_pass("NMI intercept while running guest");
		break;

	case 2:
		break;

	default:
		return true;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 3;
}

static bool nmi_check(struct svm_test *test)
{
	return get_test_stage(test) == 3;
}

#define NMI_DELAY 100000000ULL

static void nmi_message_thread(void *_test)
{
	struct svm_test *test = _test;

	while (get_test_stage(test) != 1)
		pause();

	delay(NMI_DELAY);

	apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, id_map[0]);

	while (get_test_stage(test) != 2)
		pause();

	delay(NMI_DELAY);

	apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_NMI | APIC_INT_ASSERT, id_map[0]);
}

static void nmi_hlt_test(struct svm_test *test)
{
	long long start;

	on_cpu_async(1, nmi_message_thread, test);

	start = rdtsc();

	set_test_stage(test, 1);

	asm volatile ("hlt");

	report_svm_guest(nmi_fired, test, "direct NMI + hlt");
	report(rdtsc() - start > NMI_DELAY, "direct NMI after expected delay");

	nmi_fired = false;

	vmmcall();

	start = rdtsc();

	set_test_stage(test, 2);

	asm volatile ("hlt");

	report_svm_guest(nmi_fired, test, "intercepted NMI + hlt");
	report(rdtsc() - start > NMI_DELAY, "intercepted NMI after expected delay");

	set_test_stage(test, 3);
}

static bool nmi_hlt_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;

		vmcb->control.intercept |= (1ULL << INTERCEPT_NMI);
		break;

	case 2:
		if (vmcb->control.exit_code != SVM_EXIT_NMI) {
			report_fail("VMEXIT not due to NMI intercept. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}

		report_pass("NMI intercept while running guest");
		break;

	case 3:
		break;

	default:
		return true;
	}

	return get_test_stage(test) == 3;
}

static bool nmi_hlt_check(struct svm_test *test)
{
	return get_test_stage(test) == 3;
}

static void vnmi_prepare(struct svm_test *test)
{
	nmi_prepare(test);

	/*
	 * Disable NMI interception to start.  Enabling vNMI without
	 * intercepting "real" NMIs should result in an ERR VM-Exit.
	 */
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_NMI);
	vmcb->control.int_ctl = V_NMI_ENABLE_MASK;
	vmcb->control.int_vector = NMI_VECTOR;
}

static void vnmi_test(struct svm_test *test)
{
	report_svm_guest(!nmi_fired, test, "No vNMI before injection");
	vmmcall();

	report_svm_guest(nmi_fired, test, "vNMI delivered after injection");
	vmmcall();
}

static bool vnmi_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_ERR) {
			report_fail("Wanted ERR VM-Exit, got 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		report(!nmi_fired, "vNMI enabled but NMI_INTERCEPT unset!");
		vmcb->control.intercept |= (1ULL << INTERCEPT_NMI);
		vmcb->save.rip += 3;
		break;

	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("Wanted VMMCALL VM-Exit, got 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		report(!nmi_fired, "vNMI with vector 2 not injected");
		vmcb->control.int_ctl |= V_NMI_PENDING_MASK;
		vmcb->save.rip += 3;
		break;

	case 2:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("Wanted VMMCALL VM-Exit, got 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		if (vmcb->control.int_ctl & V_NMI_BLOCKING_MASK) {
			report_fail("V_NMI_BLOCKING_MASK not cleared on VMEXIT");
			return true;
		}
		report_pass("VNMI serviced");
		vmcb->save.rip += 3;
		break;

	default:
		return true;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 3;
}

static bool vnmi_check(struct svm_test *test)
{
	return get_test_stage(test) == 3;
}

static volatile int count_exc = 0;

static void my_isr(struct ex_regs *r)
{
	count_exc++;
}

static void exc_inject_prepare(struct svm_test *test)
{
	default_prepare(test);
	handle_exception(DE_VECTOR, my_isr);
	handle_exception(NMI_VECTOR, my_isr);
}


static void exc_inject_test(struct svm_test *test)
{
	asm volatile ("vmmcall\n\tvmmcall\n\t");
}

static bool exc_inject_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;
		vmcb->control.event_inj = NMI_VECTOR | SVM_EVTINJ_TYPE_EXEPT | SVM_EVTINJ_VALID;
		break;

	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_ERR) {
			report_fail("VMEXIT not due to error. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		report(count_exc == 0, "exception with vector 2 not injected");
		vmcb->control.event_inj = DE_VECTOR | SVM_EVTINJ_TYPE_EXEPT | SVM_EVTINJ_VALID;
		break;

	case 2:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;
		report(count_exc == 1, "divide overflow exception injected");
		report(!(vmcb->control.event_inj & SVM_EVTINJ_VALID), "eventinj.VALID cleared");
		break;

	default:
		return true;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 3;
}

static bool exc_inject_check(struct svm_test *test)
{
	return count_exc == 1 && get_test_stage(test) == 3;
}

static volatile bool virq_fired;
static volatile unsigned long virq_rip;

static void virq_isr(isr_regs_t *regs)
{
	virq_fired = true;
	virq_rip = regs->rip;
}

static void virq_inject_prepare(struct svm_test *test)
{
	handle_irq(0xf1, virq_isr);
	default_prepare(test);
	vmcb->control.int_ctl = V_INTR_MASKING_MASK | V_IRQ_MASK |
		(0x0f << V_INTR_PRIO_SHIFT); // Set to the highest priority
	vmcb->control.int_vector = 0xf1;
	virq_fired = false;
	virq_rip = -1;
	set_test_stage(test, 0);
}

static void virq_inject_test(struct svm_test *test)
{
	report_svm_guest(!virq_fired, test, "virtual IRQ blocked after L2 cli");

	sti_nop_cli();

	report_svm_guest(virq_fired, test, "virtual IRQ fired after L2 sti");

	vmmcall();

	report_svm_guest(!virq_fired, test, "intercepted VINTR blocked after L2 cli");

	sti_nop_cli();

	report_svm_guest(virq_fired, test, "intercepted VINTR fired after L2 sti");

	vmmcall();

	sti_nop_cli();

	report_svm_guest(!virq_fired, test,
			  "virtual IRQ blocked V_IRQ_PRIO less than V_TPR");

	vmmcall();
	vmmcall();
}

static bool virq_inject_finished(struct svm_test *test)
{
	vmcb->save.rip += 3;

	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		if (vmcb->control.int_ctl & V_IRQ_MASK) {
			report_fail("V_IRQ not cleared on VMEXIT after firing");
			return true;
		}
		virq_fired = false;
		vmcb->control.intercept |= (1ULL << INTERCEPT_VINTR);
		vmcb->control.int_ctl = V_INTR_MASKING_MASK | V_IRQ_MASK |
			(0x0f << V_INTR_PRIO_SHIFT);
		break;

	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_VINTR) {
			report_fail("VMEXIT not due to vintr. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		if (virq_fired) {
			report_fail("V_IRQ fired before SVM_EXIT_VINTR");
			return true;
		}
		vmcb->control.intercept &= ~(1ULL << INTERCEPT_VINTR);
		break;

	case 2:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		virq_fired = false;
		// Set irq to lower priority
		vmcb->control.int_ctl = V_INTR_MASKING_MASK | V_IRQ_MASK |
			(0x08 << V_INTR_PRIO_SHIFT);
		// Raise guest TPR
		vmcb->control.int_ctl |= 0x0a & V_TPR_MASK;
		break;

	case 3:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->control.intercept |= (1ULL << INTERCEPT_VINTR);
		break;

	case 4:
		// INTERCEPT_VINTR should be ignored because V_INTR_PRIO < V_TPR
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		break;

	default:
		return true;
	}

	inc_test_stage(test);

	return get_test_stage(test) == 5;
}

static bool virq_inject_check(struct svm_test *test)
{
	return get_test_stage(test) == 5;
}

static void virq_inject_within_shadow_prepare(struct svm_test *test)
{
	virq_inject_prepare(test);
	vmcb->control.int_state = SVM_INTERRUPT_SHADOW_MASK;
	vmcb->save.rflags |= X86_EFLAGS_IF;
}

extern void virq_inject_within_shadow_test(struct svm_test *test);
asm("virq_inject_within_shadow_test: nop; nop; vmmcall");

static void virq_inject_within_shadow_prepare_gif_clear(struct svm_test *test)
{
	vmcb->save.rip = (unsigned long) test->guest_func;
}

static bool virq_inject_within_shadow_finished(struct svm_test *test)
{
	if (vmcb->control.exit_code != SVM_EXIT_VMMCALL)
		report_fail("VMEXIT not due to vmmcall. Exit reason 0x%x",
			    vmcb->control.exit_code);
	if (!virq_fired)
		report_fail("V_IRQ did not fire");
	else if (virq_rip != (unsigned long) virq_inject_within_shadow_test + 1)
		report_fail("Unexpected RIP for interrupt handler");
	else if (vmcb->control.int_ctl & V_IRQ_MASK)
		report_fail("V_IRQ not cleared on VMEXIT after firing");
	else if (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
		report_fail("Interrupt shadow not cleared");
	else
		inc_test_stage(test);

	return true;
}

static bool virq_inject_within_shadow_check(struct svm_test *test)
{
	return get_test_stage(test) == 1;
}

/*
 * Detect nested guest RIP corruption as explained in kernel commit
 * b6162e82aef19fee9c32cb3fe9ac30d9116a8c73
 *
 * In the assembly loop below 'ins' is executed while IO instructions
 * are not intercepted; the instruction is emulated by L0.
 *
 * At the same time we are getting interrupts from the local APIC timer,
 * and we do intercept them in L1
 *
 * If the interrupt happens on the insb instruction, L0 will VMexit, emulate
 * the insb instruction and then it will inject the interrupt to L1 through
 * a nested VMexit.  Due to a bug, it would leave pre-emulation values of RIP,
 * RAX and RSP in the VMCB.
 *
 * In our intercept handler we detect the bug by checking that RIP is that of
 * the insb instruction, but its memory operand has already been written.
 * This means that insb was already executed.
 */

static volatile int isr_cnt = 0;
static volatile uint8_t io_port_var = 0xAA;
extern const char insb_instruction_label[];

static void reg_corruption_isr(isr_regs_t *regs)
{
	isr_cnt++;
	apic_write(APIC_EOI, 0);
}

static void reg_corruption_prepare(struct svm_test *test)
{
	default_prepare(test);
	set_test_stage(test, 0);

	vmcb->control.int_ctl = V_INTR_MASKING_MASK;
	vmcb->control.intercept |= (1ULL << INTERCEPT_INTR);

	handle_irq(TIMER_VECTOR, reg_corruption_isr);

	/* set local APIC to inject external interrupts */
	apic_setup_timer(TIMER_VECTOR, APIC_LVT_TIMER_PERIODIC);
	apic_start_timer(1000);
}

static void reg_corruption_test(struct svm_test *test)
{
	/* this is endless loop, which is interrupted by the timer interrupt */
	asm volatile (
		      "1:\n\t"
		      "movw $0x4d0, %%dx\n\t" // IO port
		      "lea %[io_port_var], %%rdi\n\t"
		      "movb $0xAA, %[io_port_var]\n\t"
		      "insb_instruction_label:\n\t"
		      "insb\n\t"
		      "jmp 1b\n\t"

		      : [io_port_var] "=m" (io_port_var)
		      : /* no inputs*/
		      : "rdx", "rdi"
		      );
}

static bool reg_corruption_finished(struct svm_test *test)
{
	if (isr_cnt == 10000) {
		report_pass("No RIP corruption detected after %d timer interrupts",
			    isr_cnt);
		set_test_stage(test, 1);
		goto cleanup;
	}

	if (vmcb->control.exit_code == SVM_EXIT_INTR) {

		void* guest_rip = (void*)vmcb->save.rip;

		sti_nop_cli();

		if (guest_rip == insb_instruction_label && io_port_var != 0xAA) {
			report_fail("RIP corruption detected after %d timer interrupts",
				    isr_cnt);
			goto cleanup;
		}

	}
	return false;
cleanup:
	apic_cleanup_timer();
	return true;

}

static bool reg_corruption_check(struct svm_test *test)
{
	return get_test_stage(test) == 1;
}

static void get_tss_entry(void *data)
{
	*((gdt_entry_t **)data) = get_tss_descr();
}

static int orig_cpu_count;

static void init_startup_prepare(struct svm_test *test)
{
	gdt_entry_t *tss_entry;
	int i;

	on_cpu(1, get_tss_entry, &tss_entry);

	orig_cpu_count = atomic_read(&cpu_online_count);

	apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT,
		       id_map[1]);

	delay(100000000ULL);

	atomic_dec(&cpu_online_count);

	tss_entry->type &= ~DESC_BUSY;

	apic_icr_write(APIC_DEST_PHYSICAL | APIC_DM_STARTUP, id_map[1]);

	for (i = 0; i < 5 && atomic_read(&cpu_online_count) < orig_cpu_count; i++)
		delay(100000000ULL);
}

static bool init_startup_finished(struct svm_test *test)
{
	return true;
}

static bool init_startup_check(struct svm_test *test)
{
	return atomic_read(&cpu_online_count) == orig_cpu_count;
}

static volatile bool init_intercept;

static void init_intercept_prepare(struct svm_test *test)
{
	init_intercept = false;
	vmcb->control.intercept |= (1ULL << INTERCEPT_INIT);
}

static void init_intercept_test(struct svm_test *test)
{
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_INIT | APIC_INT_ASSERT, 0);
}

static bool init_intercept_finished(struct svm_test *test)
{
	vmcb->save.rip += 3;

	if (vmcb->control.exit_code != SVM_EXIT_INIT) {
		report_fail("VMEXIT not due to init intercept. Exit reason 0x%x",
			    vmcb->control.exit_code);

		return true;
	}

	init_intercept = true;

	report_pass("INIT to vcpu intercepted");

	return true;
}

static bool init_intercept_check(struct svm_test *test)
{
	return init_intercept;
}

/*
 * Setting host EFLAGS.TF causes a #DB trap after the VMRUN completes on the
 * host side (i.e., after the #VMEXIT from the guest).
 *
 * Setting host EFLAGS.RF suppresses any potential instruction breakpoint
 * match on the VMRUN and completion of the VMRUN instruction clears the
 * host EFLAGS.RF bit.
 *
 * [AMD APM]
 */
static volatile u8 host_rflags_guest_main_flag = 0;
static volatile u8 host_rflags_db_handler_flag = 0;
static volatile bool host_rflags_ss_on_vmrun = false;
static volatile bool host_rflags_vmrun_reached = false;
static volatile bool host_rflags_set_tf = false;
static volatile bool host_rflags_set_rf = false;
static u64 rip_detected;

extern u64 *vmrun_rip;

static void host_rflags_db_handler(struct ex_regs *r)
{
	if (host_rflags_ss_on_vmrun) {
		if (host_rflags_vmrun_reached) {
			if (!host_rflags_set_rf) {
				r->rflags &= ~X86_EFLAGS_TF;
				rip_detected = r->rip;
			} else {
				r->rflags |= X86_EFLAGS_RF;
				++host_rflags_db_handler_flag;
			}
		} else {
			if (r->rip == (u64)&vmrun_rip) {
				host_rflags_vmrun_reached = true;

				if (host_rflags_set_rf) {
					host_rflags_guest_main_flag = 0;
					rip_detected = r->rip;
					r->rflags &= ~X86_EFLAGS_TF;

					/* Trigger #DB via debug registers */
					write_dr0((void *)&vmrun_rip);
					write_dr7(0x403);
				}
			}
		}
	} else {
		r->rflags &= ~X86_EFLAGS_TF;
	}
}

static void host_rflags_prepare(struct svm_test *test)
{
	default_prepare(test);
	handle_exception(DB_VECTOR, host_rflags_db_handler);
	set_test_stage(test, 0);
}

static void host_rflags_prepare_gif_clear(struct svm_test *test)
{
	if (host_rflags_set_tf)
		write_rflags(read_rflags() | X86_EFLAGS_TF);
}

static void host_rflags_test(struct svm_test *test)
{
	while (1) {
		if (get_test_stage(test) > 0) {
			if ((host_rflags_set_tf && !host_rflags_ss_on_vmrun && !host_rflags_db_handler_flag) ||
			    (host_rflags_set_rf && host_rflags_db_handler_flag == 1))
				host_rflags_guest_main_flag = 1;
		}

		if (get_test_stage(test) == 4)
			break;
		vmmcall();
	}
}

static bool host_rflags_finished(struct svm_test *test)
{
	switch (get_test_stage(test)) {
	case 0:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
			report_fail("Unexpected VMEXIT. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;
		/*
		 * Setting host EFLAGS.TF not immediately before VMRUN, causes
		 * #DB trap before first guest instruction is executed
		 */
		host_rflags_set_tf = true;
		break;
	case 1:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL ||
		    host_rflags_guest_main_flag != 1) {
			report_fail("Unexpected VMEXIT or #DB handler"
				    " invoked before guest main. Exit reason 0x%x",
				    vmcb->control.exit_code);
			return true;
		}
		vmcb->save.rip += 3;
		/*
		 * Setting host EFLAGS.TF immediately before VMRUN, causes #DB
		 * trap after VMRUN completes on the host side (i.e., after
		 * VMEXIT from guest).
		 */
		host_rflags_ss_on_vmrun = true;
		break;
	case 2:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL ||
		    rip_detected != (u64)&vmrun_rip + 3) {
			report_fail("Unexpected VMEXIT or RIP mismatch."
				    " Exit reason 0x%x, RIP actual: %lx, RIP expected: "
				    "%lx", vmcb->control.exit_code,
				    (u64)&vmrun_rip + 3, rip_detected);
			return true;
		}
		host_rflags_set_rf = true;
		host_rflags_guest_main_flag = 0;
		host_rflags_vmrun_reached = false;
		vmcb->save.rip += 3;
		break;
	case 3:
		if (vmcb->control.exit_code != SVM_EXIT_VMMCALL ||
		    rip_detected != (u64)&vmrun_rip ||
		    host_rflags_guest_main_flag != 1 ||
		    host_rflags_db_handler_flag > 1 ||
		    read_rflags() & X86_EFLAGS_RF) {
			report_fail("Unexpected VMEXIT or RIP mismatch or "
				    "EFLAGS.RF not cleared."
				    " Exit reason 0x%x, RIP actual: %lx, RIP expected: "
				    "%lx", vmcb->control.exit_code,
				    (u64)&vmrun_rip, rip_detected);
			return true;
		}
		host_rflags_set_tf = false;
		host_rflags_set_rf = false;
		vmcb->save.rip += 3;
		break;
	default:
		return true;
	}
	inc_test_stage(test);
	return get_test_stage(test) == 5;
}

static bool host_rflags_check(struct svm_test *test)
{
	return get_test_stage(test) == 4;
}

#define TEST(name) { #name, .v2 = name }

/*
 * v2 tests
 */

/*
 * Ensure that kvm recalculates the L1 guest's CPUID.01H:ECX.OSXSAVE
 * after VM-exit from an L2 guest that sets CR4.OSXSAVE to a different
 * value than in L1.
 */

static void svm_cr4_osxsave_test_guest(struct svm_test *test)
{
	write_cr4(read_cr4() & ~X86_CR4_OSXSAVE);
}

static void svm_cr4_osxsave_test(void)
{
	if (!this_cpu_has(X86_FEATURE_XSAVE)) {
		report_skip("XSAVE not detected");
		return;
	}

	if (!(read_cr4() & X86_CR4_OSXSAVE)) {
		unsigned long cr4 = read_cr4() | X86_CR4_OSXSAVE;

		write_cr4(cr4);
		vmcb->save.cr4 = cr4;
	}

	report(this_cpu_has(X86_FEATURE_OSXSAVE), "CPUID.01H:ECX.XSAVE set before VMRUN");

	test_set_guest(svm_cr4_osxsave_test_guest);
	report(svm_vmrun() == SVM_EXIT_VMMCALL,
	       "svm_cr4_osxsave_test_guest finished with VMMCALL");

	report(this_cpu_has(X86_FEATURE_OSXSAVE), "CPUID.01H:ECX.XSAVE set after VMRUN");
}

static void basic_guest_main(struct svm_test *test)
{
}


#define SVM_TEST_REG_RESERVED_BITS(start, end, inc, str_name, reg, val,	\
				   resv_mask)				\
{									\
	u64 tmp, mask;							\
	int i;								\
									\
	for (i = start; i <= end; i = i + inc) {			\
		mask = 1ull << i;					\
		if (!(mask & resv_mask))				\
			continue;					\
		tmp = val | mask;					\
		reg = tmp;						\
		report(svm_vmrun() == SVM_EXIT_ERR, "Test %s %d:%d: %lx", \
		       str_name, end, start, tmp);			\
	}								\
}

#define SVM_TEST_CR_RESERVED_BITS(start, end, inc, cr, val, resv_mask,	\
				  exit_code, test_name)			\
{									\
	u64 tmp, mask;							\
	u32 r;								\
	int i;								\
									\
	for (i = start; i <= end; i = i + inc) {			\
		mask = 1ull << i;					\
		if (!(mask & resv_mask))				\
			continue;					\
		tmp = val | mask;					\
		switch (cr) {						\
		case 0:							\
			vmcb->save.cr0 = tmp;				\
			break;						\
		case 3:							\
			vmcb->save.cr3 = tmp;				\
			break;						\
		case 4:							\
			vmcb->save.cr4 = tmp;				\
		}							\
		r = svm_vmrun();					\
		report(r == exit_code, "Test CR%d %s%d:%d: %lx, wanted exit 0x%x, got 0x%x", \
		       cr, test_name, end, start, tmp, exit_code, r);	\
	}								\
}

static void test_efer(void)
{
	/*
	 * Un-setting EFER.SVME is illegal
	 */
	u64 efer_saved = vmcb->save.efer;
	u64 efer = efer_saved;

	report (svm_vmrun() == SVM_EXIT_VMMCALL, "EFER.SVME: %lx", efer);
	efer &= ~EFER_SVME;
	vmcb->save.efer = efer;
	report (svm_vmrun() == SVM_EXIT_ERR, "EFER.SVME: %lx", efer);
	vmcb->save.efer = efer_saved;

	/*
	 * EFER MBZ bits: 63:16, 9
	 */
	efer_saved = vmcb->save.efer;

	SVM_TEST_REG_RESERVED_BITS(8, 9, 1, "EFER", vmcb->save.efer,
				   efer_saved, SVM_EFER_RESERVED_MASK);
	SVM_TEST_REG_RESERVED_BITS(16, 63, 4, "EFER", vmcb->save.efer,
				   efer_saved, SVM_EFER_RESERVED_MASK);

	/*
	 * EFER.LME and CR0.PG are both set and CR4.PAE is zero.
	 */
	u64 cr0_saved = vmcb->save.cr0;
	u64 cr0;
	u64 cr4_saved = vmcb->save.cr4;
	u64 cr4;

	efer = efer_saved | EFER_LME;
	vmcb->save.efer = efer;
	cr0 = cr0_saved | X86_CR0_PG | X86_CR0_PE;
	vmcb->save.cr0 = cr0;
	cr4 = cr4_saved & ~X86_CR4_PAE;
	vmcb->save.cr4 = cr4;
	report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), "
	       "CR0.PG=1 (%lx) and CR4.PAE=0 (%lx)", efer, cr0, cr4);

	/*
	 * EFER.LME and CR0.PG are both set and CR0.PE is zero.
	 * CR4.PAE needs to be set as we otherwise cannot
	 * determine if CR4.PAE=0 or CR0.PE=0 triggered the
	 * SVM_EXIT_ERR.
	 */
	cr4 = cr4_saved | X86_CR4_PAE;
	vmcb->save.cr4 = cr4;
	cr0 &= ~X86_CR0_PE;
	vmcb->save.cr0 = cr0;
	report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), "
	       "CR0.PG=1 and CR0.PE=0 (%lx)", efer, cr0);

	/*
	 * EFER.LME, CR0.PG, CR4.PAE, CS.L, and CS.D are all non-zero.
	 */
	u32 cs_attrib_saved = vmcb->save.cs.attrib;
	u32 cs_attrib;

	cr0 |= X86_CR0_PE;
	vmcb->save.cr0 = cr0;
	cs_attrib = cs_attrib_saved | SVM_SELECTOR_L_MASK |
		SVM_SELECTOR_DB_MASK;
	vmcb->save.cs.attrib = cs_attrib;
	report(svm_vmrun() == SVM_EXIT_ERR, "EFER.LME=1 (%lx), "
	       "CR0.PG=1 (%lx), CR4.PAE=1 (%lx), CS.L=1 and CS.D=1 (%x)",
	       efer, cr0, cr4, cs_attrib);

	vmcb->save.cr0 = cr0_saved;
	vmcb->save.cr4 = cr4_saved;
	vmcb->save.efer = efer_saved;
	vmcb->save.cs.attrib = cs_attrib_saved;
}

static void test_cr0(void)
{
	/*
	 * Un-setting CR0.CD and setting CR0.NW is illegal combination
	 */
	u64 cr0_saved = vmcb->save.cr0;
	u64 cr0 = cr0_saved;

	cr0 |= X86_CR0_CD;
	cr0 &= ~X86_CR0_NW;
	vmcb->save.cr0 = cr0;
	report (svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR0 CD=1,NW=0: %lx",
		cr0);
	cr0 |= X86_CR0_NW;
	vmcb->save.cr0 = cr0;
	report (svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR0 CD=1,NW=1: %lx",
		cr0);
	cr0 &= ~X86_CR0_NW;
	cr0 &= ~X86_CR0_CD;
	vmcb->save.cr0 = cr0;
	report (svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR0 CD=0,NW=0: %lx",
		cr0);
	cr0 |= X86_CR0_NW;
	vmcb->save.cr0 = cr0;
	report (svm_vmrun() == SVM_EXIT_ERR, "Test CR0 CD=0,NW=1: %lx",
		cr0);
	vmcb->save.cr0 = cr0_saved;

	/*
	 * CR0[63:32] are not zero
	 */
	cr0 = cr0_saved;

	SVM_TEST_REG_RESERVED_BITS(32, 63, 4, "CR0", vmcb->save.cr0, cr0_saved,
				   SVM_CR0_RESERVED_MASK);
	vmcb->save.cr0 = cr0_saved;
}

static void test_cr3(void)
{
	/*
	 * CR3 MBZ bits based on different modes:
	 *   [63:52] - long mode
	 */
	u64 cr3_saved = vmcb->save.cr3;

	SVM_TEST_CR_RESERVED_BITS(0, 63, 1, 3, cr3_saved,
				  SVM_CR3_LONG_MBZ_MASK, SVM_EXIT_ERR, "");

	vmcb->save.cr3 = cr3_saved & ~SVM_CR3_LONG_MBZ_MASK;
	report(svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR3 63:0: %lx",
	       vmcb->save.cr3);

	/*
	 * CR3 non-MBZ reserved bits based on different modes:
	 *   [11:5] [2:0] - long mode (PCIDE=0)
	 *          [2:0] - PAE legacy mode
	 */
	u64 cr4_saved = vmcb->save.cr4;
	u64 *pdpe = npt_get_pml4e();

	/*
	 * Long mode
	 */
	if (this_cpu_has(X86_FEATURE_PCID)) {
		vmcb->save.cr4 = cr4_saved | X86_CR4_PCIDE;
		SVM_TEST_CR_RESERVED_BITS(0, 11, 1, 3, cr3_saved,
					  SVM_CR3_LONG_RESERVED_MASK, SVM_EXIT_VMMCALL, "(PCIDE=1) ");

		vmcb->save.cr3 = cr3_saved & ~SVM_CR3_LONG_RESERVED_MASK;
		report(svm_vmrun() == SVM_EXIT_VMMCALL, "Test CR3 63:0: %lx",
		       vmcb->save.cr3);
	}

	vmcb->save.cr4 = cr4_saved & ~X86_CR4_PCIDE;

	if (!npt_supported())
		goto skip_npt_only;

	/* Clear P (Present) bit in NPT in order to trigger #NPF */
	pdpe[0] &= ~1ULL;

	SVM_TEST_CR_RESERVED_BITS(0, 11, 1, 3, cr3_saved,
				  SVM_CR3_LONG_RESERVED_MASK, SVM_EXIT_NPF, "(PCIDE=0) ");

	pdpe[0] |= 1ULL;
	vmcb->save.cr3 = cr3_saved;

	/*
	 * PAE legacy
	 */
	pdpe[0] &= ~1ULL;
	vmcb->save.cr4 = cr4_saved | X86_CR4_PAE;
	SVM_TEST_CR_RESERVED_BITS(0, 2, 1, 3, cr3_saved,
				  SVM_CR3_PAE_LEGACY_RESERVED_MASK, SVM_EXIT_NPF, "(PAE) ");

	pdpe[0] |= 1ULL;

skip_npt_only:
	vmcb->save.cr3 = cr3_saved;
	vmcb->save.cr4 = cr4_saved;
}

/* Test CR4 MBZ bits based on legacy or long modes */
static void test_cr4(void)
{
	u64 cr4_saved = vmcb->save.cr4;
	u64 efer_saved = vmcb->save.efer;
	u64 efer = efer_saved;

	efer &= ~EFER_LME;
	vmcb->save.efer = efer;
	SVM_TEST_CR_RESERVED_BITS(12, 31, 1, 4, cr4_saved,
				  SVM_CR4_LEGACY_RESERVED_MASK, SVM_EXIT_ERR, "");

	efer |= EFER_LME;
	vmcb->save.efer = efer;
	SVM_TEST_CR_RESERVED_BITS(12, 31, 1, 4, cr4_saved,
				  SVM_CR4_RESERVED_MASK, SVM_EXIT_ERR, "");
	SVM_TEST_CR_RESERVED_BITS(32, 63, 4, 4, cr4_saved,
				  SVM_CR4_RESERVED_MASK, SVM_EXIT_ERR, "");

	vmcb->save.cr4 = cr4_saved;
	vmcb->save.efer = efer_saved;
}

static void test_dr(void)
{
	/*
	 * DR6[63:32] and DR7[63:32] are MBZ
	 */
	u64 dr_saved = vmcb->save.dr6;

	SVM_TEST_REG_RESERVED_BITS(32, 63, 4, "DR6", vmcb->save.dr6, dr_saved,
				   SVM_DR6_RESERVED_MASK);
	vmcb->save.dr6 = dr_saved;

	dr_saved = vmcb->save.dr7;
	SVM_TEST_REG_RESERVED_BITS(32, 63, 4, "DR7", vmcb->save.dr7, dr_saved,
				   SVM_DR7_RESERVED_MASK);

	vmcb->save.dr7 = dr_saved;
}

/* TODO: verify if high 32-bits are sign- or zero-extended on bare metal */
#define	TEST_BITMAP_ADDR(save_intercept, type, addr, exit_code,		\
			 msg) {						\
		vmcb->control.intercept = saved_intercept | 1ULL << type; \
		if (type == INTERCEPT_MSR_PROT)				\
			vmcb->control.msrpm_base_pa = addr;		\
		else							\
			vmcb->control.iopm_base_pa = addr;		\
		report(svm_vmrun() == exit_code,			\
		       "Test %s address: %lx", msg, addr);		\
	}

/*
 * If the MSR or IOIO intercept table extends to a physical address that
 * is greater than or equal to the maximum supported physical address, the
 * guest state is illegal.
 *
 * The VMRUN instruction ignores the lower 12 bits of the address specified
 * in the VMCB.
 *
 * MSRPM spans 2 contiguous 4KB pages while IOPM spans 2 contiguous 4KB
 * pages + 1 byte.
 *
 * [APM vol 2]
 *
 * Note: Unallocated MSRPM addresses conforming to consistency checks, generate
 * #NPF.
 */
static void test_msrpm_iopm_bitmap_addrs(void)
{
	u64 saved_intercept = vmcb->control.intercept;
	u64 addr_beyond_limit = 1ull << cpuid_maxphyaddr();
	u64 addr = virt_to_phys(msr_bitmap) & (~((1ull << 12) - 1));

	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT,
			 addr_beyond_limit - 2 * PAGE_SIZE, SVM_EXIT_ERR,
			 "MSRPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT,
			 addr_beyond_limit - 2 * PAGE_SIZE + 1, SVM_EXIT_ERR,
			 "MSRPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT,
			 addr_beyond_limit - PAGE_SIZE, SVM_EXIT_ERR,
			 "MSRPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, addr,
			 SVM_EXIT_VMMCALL, "MSRPM");
	addr |= (1ull << 12) - 1;
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_MSR_PROT, addr,
			 SVM_EXIT_VMMCALL, "MSRPM");

	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT,
			 addr_beyond_limit - 4 * PAGE_SIZE, SVM_EXIT_VMMCALL,
			 "IOPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT,
			 addr_beyond_limit - 3 * PAGE_SIZE, SVM_EXIT_VMMCALL,
			 "IOPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT,
			 addr_beyond_limit - 2 * PAGE_SIZE - 2, SVM_EXIT_VMMCALL,
			 "IOPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT,
			 addr_beyond_limit - 2 * PAGE_SIZE, SVM_EXIT_ERR,
			 "IOPM");
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT,
			 addr_beyond_limit - PAGE_SIZE, SVM_EXIT_ERR,
			 "IOPM");
	addr = virt_to_phys(io_bitmap) & (~((1ull << 11) - 1));
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, addr,
			 SVM_EXIT_VMMCALL, "IOPM");
	addr |= (1ull << 12) - 1;
	TEST_BITMAP_ADDR(saved_intercept, INTERCEPT_IOIO_PROT, addr,
			 SVM_EXIT_VMMCALL, "IOPM");

	vmcb->control.intercept = saved_intercept;
}

/*
 * Unlike VMSAVE, VMRUN seems not to update the value of noncanonical
 * segment bases in the VMCB.  However, VMENTRY succeeds as documented.
 */
#define TEST_CANONICAL_VMRUN(seg_base, msg)				\
	saved_addr = seg_base;						\
	seg_base = (seg_base & ((1ul << addr_limit) - 1)) | noncanonical_mask; \
	return_value = svm_vmrun();					\
	report(return_value == SVM_EXIT_VMMCALL,			\
	       "Successful VMRUN with noncanonical %s.base", msg);	\
	seg_base = saved_addr;


#define TEST_CANONICAL_VMLOAD(seg_base, msg)				\
	saved_addr = seg_base;						\
	seg_base = (seg_base & ((1ul << addr_limit) - 1)) | noncanonical_mask; \
	asm volatile ("vmload %0" : : "a"(vmcb_phys) : "memory");	\
	asm volatile ("vmsave %0" : : "a"(vmcb_phys) : "memory");	\
	report(is_canonical(seg_base),					\
	       "Test %s.base for canonical form: %lx", msg, seg_base);	\
	seg_base = saved_addr;

static void test_canonicalization(void)
{
	u64 saved_addr;
	u64 return_value;
	u64 addr_limit;
	u64 vmcb_phys = virt_to_phys(vmcb);

	addr_limit = (this_cpu_has(X86_FEATURE_LA57)) ? 57 : 48;
	u64 noncanonical_mask = NONCANONICAL & ~((1ul << addr_limit) - 1);

	TEST_CANONICAL_VMLOAD(vmcb->save.fs.base, "FS");
	TEST_CANONICAL_VMLOAD(vmcb->save.gs.base, "GS");
	TEST_CANONICAL_VMLOAD(vmcb->save.ldtr.base, "LDTR");
	TEST_CANONICAL_VMLOAD(vmcb->save.tr.base, "TR");
	TEST_CANONICAL_VMLOAD(vmcb->save.kernel_gs_base, "KERNEL GS");
	TEST_CANONICAL_VMRUN(vmcb->save.es.base, "ES");
	TEST_CANONICAL_VMRUN(vmcb->save.cs.base, "CS");
	TEST_CANONICAL_VMRUN(vmcb->save.ss.base, "SS");
	TEST_CANONICAL_VMRUN(vmcb->save.ds.base, "DS");
	TEST_CANONICAL_VMRUN(vmcb->save.gdtr.base, "GDTR");
	TEST_CANONICAL_VMRUN(vmcb->save.idtr.base, "IDTR");
}

/*
 * When VMRUN loads a guest value of 1 in EFLAGS.TF, that value does not
 * cause a trace trap between the VMRUN and the first guest instruction, but
 * rather after completion of the first guest instruction.
 *
 * [APM vol 2]
 */
u64 guest_rflags_test_trap_rip;

static void guest_rflags_test_db_handler(struct ex_regs *r)
{
	guest_rflags_test_trap_rip = r->rip;
	r->rflags &= ~X86_EFLAGS_TF;
}

static void svm_guest_state_test(void)
{
	test_set_guest(basic_guest_main);
	test_efer();
	test_cr0();
	test_cr3();
	test_cr4();
	test_dr();
	test_msrpm_iopm_bitmap_addrs();
	test_canonicalization();
}

extern void guest_rflags_test_guest(struct svm_test *test);
extern u64 *insn2;
extern u64 *guest_end;

asm("guest_rflags_test_guest:\n\t"
    "push %rbp\n\t"
    ".global insn2\n\t"
    "insn2:\n\t"
    "mov %rsp,%rbp\n\t"
    "vmmcall\n\t"
    "vmmcall\n\t"
    ".global guest_end\n\t"
    "guest_end:\n\t"
    "vmmcall\n\t"
    "pop %rbp\n\t"
    "ret");

static void svm_test_singlestep(void)
{
	handle_exception(DB_VECTOR, guest_rflags_test_db_handler);

	/*
	 * Trap expected after completion of first guest instruction
	 */
	vmcb->save.rflags |= X86_EFLAGS_TF;
	report (__svm_vmrun((u64)guest_rflags_test_guest) == SVM_EXIT_VMMCALL &&
		guest_rflags_test_trap_rip == (u64)&insn2,
		"Test EFLAGS.TF on VMRUN: trap expected  after completion of first guest instruction");
	/*
	 * No trap expected
	 */
	guest_rflags_test_trap_rip = 0;
	vmcb->save.rip += 3;
	vmcb->save.rflags |= X86_EFLAGS_TF;
	report (__svm_vmrun(vmcb->save.rip) == SVM_EXIT_VMMCALL &&
		guest_rflags_test_trap_rip == 0, "Test EFLAGS.TF on VMRUN: trap not expected");

	/*
	 * Let guest finish execution
	 */
	vmcb->save.rip += 3;
	report (__svm_vmrun(vmcb->save.rip) == SVM_EXIT_VMMCALL &&
		vmcb->save.rip == (u64)&guest_end, "Test EFLAGS.TF on VMRUN: guest execution completion");
}

static bool volatile svm_errata_reproduced = false;
static unsigned long volatile physical = 0;


/*
 *
 * Test the following errata:
 * If the VMRUN/VMSAVE/VMLOAD are attempted by the nested guest,
 * the CPU would first check the EAX against host reserved memory
 * regions (so far only SMM_ADDR/SMM_MASK are known to cause it),
 * and only then signal #VMexit
 *
 * Try to reproduce this by trying vmsave on each possible 4K aligned memory
 * address in the low 4G where the SMM area has to reside.
 */

static void gp_isr(struct ex_regs *r)
{
	svm_errata_reproduced = true;
	/* skip over the vmsave instruction*/
	r->rip += 3;
}

static void svm_vmrun_errata_test(void)
{
	unsigned long *last_page = NULL;

	handle_exception(GP_VECTOR, gp_isr);

	while (!svm_errata_reproduced) {

		unsigned long *page = alloc_pages(1);

		if (!page) {
			report_pass("All guest memory tested, no bug found");
			break;
		}

		physical = virt_to_phys(page);

		asm volatile (
			      "mov %[_physical], %%rax\n\t"
			      "vmsave %%rax\n\t"

			      : [_physical] "=m" (physical)
			      : /* no inputs*/
			      : "rax" /*clobbers*/
			      );

		if (svm_errata_reproduced) {
			report_fail("Got #GP exception - svm errata reproduced at 0x%lx",
				    physical);
			break;
		}

		*page = (unsigned long)last_page;
		last_page = page;
	}

	while (last_page) {
		unsigned long *page = last_page;
		last_page = (unsigned long *)*last_page;
		free_pages_by_order(page, 1);
	}
}

static void vmload_vmsave_guest_main(struct svm_test *test)
{
	u64 vmcb_phys = virt_to_phys(vmcb);

	asm volatile ("vmload %0" : : "a"(vmcb_phys));
	asm volatile ("vmsave %0" : : "a"(vmcb_phys));
}

static void svm_vmload_vmsave(void)
{
	u32 intercept_saved = vmcb->control.intercept;

	test_set_guest(vmload_vmsave_guest_main);

	/*
	 * Disabling intercept for VMLOAD and VMSAVE doesn't cause
	 * respective #VMEXIT to host
	 */
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMLOAD);
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMSAVE);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT");

	/*
	 * Enabling intercept for VMLOAD and VMSAVE causes respective
	 * #VMEXIT to host
	 */
	vmcb->control.intercept |= (1ULL << INTERCEPT_VMLOAD);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMLOAD, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMLOAD #VMEXIT");
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMLOAD);
	vmcb->control.intercept |= (1ULL << INTERCEPT_VMSAVE);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMSAVE, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMSAVE #VMEXIT");
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMSAVE);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT");

	vmcb->control.intercept |= (1ULL << INTERCEPT_VMLOAD);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMLOAD, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMLOAD #VMEXIT");
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMLOAD);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT");

	vmcb->control.intercept |= (1ULL << INTERCEPT_VMSAVE);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMSAVE, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMSAVE #VMEXIT");
	vmcb->control.intercept &= ~(1ULL << INTERCEPT_VMSAVE);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "Test "
	       "VMLOAD/VMSAVE intercept: Expected VMMCALL #VMEXIT");

	vmcb->control.intercept = intercept_saved;
}

static void prepare_vgif_enabled(struct svm_test *test)
{
	default_prepare(test);
}

static void test_vgif(struct svm_test *test)
{
	asm volatile ("vmmcall\n\tstgi\n\tvmmcall\n\tclgi\n\tvmmcall\n\t");
}

static bool vgif_finished(struct svm_test *test)
{
	switch (get_test_stage(test))
		{
		case 0:
			if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
				report_fail("VMEXIT not due to vmmcall.");
				return true;
			}
			vmcb->control.int_ctl |= V_GIF_ENABLED_MASK;
			vmcb->save.rip += 3;
			inc_test_stage(test);
			break;
		case 1:
			if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
				report_fail("VMEXIT not due to vmmcall.");
				return true;
			}
			if (!(vmcb->control.int_ctl & V_GIF_MASK)) {
				report_fail("Failed to set VGIF when executing STGI.");
				vmcb->control.int_ctl &= ~V_GIF_ENABLED_MASK;
				return true;
			}
			report_pass("STGI set VGIF bit.");
			vmcb->save.rip += 3;
			inc_test_stage(test);
			break;
		case 2:
			if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
				report_fail("VMEXIT not due to vmmcall.");
				return true;
			}
			if (vmcb->control.int_ctl & V_GIF_MASK) {
				report_fail("Failed to clear VGIF when executing CLGI.");
				vmcb->control.int_ctl &= ~V_GIF_ENABLED_MASK;
				return true;
			}
			report_pass("CLGI cleared VGIF bit.");
			vmcb->save.rip += 3;
			inc_test_stage(test);
			vmcb->control.int_ctl &= ~V_GIF_ENABLED_MASK;
			break;
		default:
			return true;
			break;
		}

	return get_test_stage(test) == 3;
}

static bool vgif_check(struct svm_test *test)
{
	return get_test_stage(test) == 3;
}


static int pause_test_counter;
static int wait_counter;

static void pause_filter_test_guest_main(struct svm_test *test)
{
	int i;
	for (i = 0 ; i < pause_test_counter ; i++)
		pause();

	if (!wait_counter)
		return;

	for (i = 0; i < wait_counter; i++)
		;

	for (i = 0 ; i < pause_test_counter ; i++)
		pause();

}

static void pause_filter_run_test(int pause_iterations, int filter_value, int wait_iterations, int threshold)
{
	test_set_guest(pause_filter_test_guest_main);

	pause_test_counter = pause_iterations;
	wait_counter = wait_iterations;

	vmcb->control.pause_filter_count = filter_value;
	vmcb->control.pause_filter_thresh = threshold;
	svm_vmrun();

	if (filter_value <= pause_iterations || wait_iterations < threshold)
		report(vmcb->control.exit_code == SVM_EXIT_PAUSE, "expected PAUSE vmexit");
	else
		report(vmcb->control.exit_code == SVM_EXIT_VMMCALL, "no expected PAUSE vmexit");
}

static void pause_filter_test(void)
{
	if (!pause_filter_supported()) {
		report_skip("PAUSE filter not supported in the guest");
		return;
	}

	vmcb->control.intercept |= (1 << INTERCEPT_PAUSE);

	// filter count more that pause count - no VMexit
	pause_filter_run_test(10, 9, 0, 0);

	// filter count smaller pause count - no VMexit
	pause_filter_run_test(20, 21, 0, 0);


	if (pause_threshold_supported()) {
		// filter count smaller pause count - no VMexit +  large enough threshold
		// so that filter counter resets
		pause_filter_run_test(20, 21, 1000, 10);

		// filter count smaller pause count - no VMexit +  small threshold
		// so that filter doesn't reset
		pause_filter_run_test(20, 21, 10, 1000);
	} else {
		report_skip("PAUSE threshold not supported in the guest");
		return;
	}
}

/* If CR0.TS and CR0.EM are cleared in L2, no #NM is generated. */
static void svm_no_nm_test(void)
{
	write_cr0(read_cr0() & ~X86_CR0_TS);
	test_set_guest((test_guest_func)fnop);

	vmcb->save.cr0 = vmcb->save.cr0 & ~(X86_CR0_TS | X86_CR0_EM);
	report(svm_vmrun() == SVM_EXIT_VMMCALL,
	       "fnop with CR0.TS and CR0.EM unset no #NM exception");
}

static u64 amd_get_lbr_rip(u32 msr)
{
	return rdmsr(msr) & ~AMD_LBR_RECORD_MISPREDICT;
}

#define HOST_CHECK_LBR(from_expected, to_expected)					\
do {											\
	TEST_EXPECT_EQ((u64)from_expected, amd_get_lbr_rip(MSR_IA32_LASTBRANCHFROMIP));	\
	TEST_EXPECT_EQ((u64)to_expected, amd_get_lbr_rip(MSR_IA32_LASTBRANCHTOIP));	\
} while (0)

/*
 * FIXME: Do something other than generate an exception to communicate failure.
 * Debugging without expected vs. actual is an absolute nightmare.
 */
#define GUEST_CHECK_LBR(from_expected, to_expected)				\
do {										\
	if ((u64)(from_expected) != amd_get_lbr_rip(MSR_IA32_LASTBRANCHFROMIP))	\
		asm volatile("ud2");						\
	if ((u64)(to_expected) != amd_get_lbr_rip(MSR_IA32_LASTBRANCHTOIP))	\
		asm volatile("ud2");						\
} while (0)

#define REPORT_GUEST_LBR_ERROR(vmcb)						\
	report(false, "LBR guest test failed.  Exit reason 0x%x, RIP = %lx, from = %lx, to = %lx, ex from = %lx, ex to = %lx", \
		       vmcb->control.exit_code, vmcb->save.rip,			\
		       vmcb->save.br_from, vmcb->save.br_to,			\
		       vmcb->save.last_excp_from, vmcb->save.last_excp_to)

#define DO_BRANCH(branch_name)				\
	asm volatile (					\
		      # branch_name "_from:"		\
		      "jmp " # branch_name  "_to\n"	\
		      "nop\n"				\
		      "nop\n"				\
		      # branch_name  "_to:"		\
		      "nop\n"				\
		       )


extern u64 guest_branch0_from, guest_branch0_to;
extern u64 guest_branch2_from, guest_branch2_to;

extern u64 host_branch0_from, host_branch0_to;
extern u64 host_branch2_from, host_branch2_to;
extern u64 host_branch3_from, host_branch3_to;
extern u64 host_branch4_from, host_branch4_to;

u64 dbgctl;

static void svm_lbrv_test_guest1(void)
{
	/*
	 * This guest expects the LBR to be already enabled when it starts,
	 * it does a branch, and then disables the LBR and then checks.
	 */

	DO_BRANCH(guest_branch0);

	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);

	if (dbgctl != DEBUGCTLMSR_LBR)
		asm volatile("ud2\n");
	if (rdmsr(MSR_IA32_DEBUGCTLMSR) != 0)
		asm volatile("ud2\n");

	GUEST_CHECK_LBR(&guest_branch0_from, &guest_branch0_to);
	asm volatile ("vmmcall\n");
}

static void svm_lbrv_test_guest2(void)
{
	/*
	 * This guest expects the LBR to be disabled when it starts,
	 * enables it, does a branch, disables it and then checks.
	 */

	DO_BRANCH(guest_branch1);
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);

	if (dbgctl != 0)
		asm volatile("ud2\n");

	GUEST_CHECK_LBR(&host_branch2_from, &host_branch2_to);

	wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR);
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	DO_BRANCH(guest_branch2);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);

	if (dbgctl != DEBUGCTLMSR_LBR)
		asm volatile("ud2\n");
	GUEST_CHECK_LBR(&guest_branch2_from, &guest_branch2_to);

	asm volatile ("vmmcall\n");
}

static void svm_lbrv_test0(void)
{
	report(true, "Basic LBR test");
	wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR);
	DO_BRANCH(host_branch0);
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);

	TEST_EXPECT_EQ(dbgctl, DEBUGCTLMSR_LBR);
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	TEST_EXPECT_EQ(dbgctl, 0);

	HOST_CHECK_LBR(&host_branch0_from, &host_branch0_to);
}

static void svm_lbrv_test1(void)
{
	report(true, "Test that without LBRV enabled, guest LBR state does 'leak' to the host(1)");

	svm_setup_vmrun((u64)svm_lbrv_test_guest1);
	vmcb->control.virt_ext = 0;

	wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR);
	DO_BRANCH(host_branch1);
	SVM_BARE_VMRUN;
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);

	if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
		REPORT_GUEST_LBR_ERROR(vmcb);
		return;
	}

	TEST_EXPECT_EQ(dbgctl, 0);
	HOST_CHECK_LBR(&guest_branch0_from, &guest_branch0_to);
}

static void svm_lbrv_test2(void)
{
	report(true, "Test that without LBRV enabled, guest LBR state does 'leak' to the host(2)");

	svm_setup_vmrun((u64)svm_lbrv_test_guest2);
	vmcb->control.virt_ext = 0;

	wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR);
	DO_BRANCH(host_branch2);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);
	SVM_BARE_VMRUN;
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);

	if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
		REPORT_GUEST_LBR_ERROR(vmcb);
		return;
	}

	TEST_EXPECT_EQ(dbgctl, 0);
	HOST_CHECK_LBR(&guest_branch2_from, &guest_branch2_to);
}

static void svm_lbrv_nested_test1(void)
{
	if (!lbrv_supported()) {
		report_skip("LBRV not supported in the guest");
		return;
	}

	report(true, "Test that with LBRV enabled, guest LBR state doesn't leak (1)");
	svm_setup_vmrun((u64)svm_lbrv_test_guest1);
	vmcb->control.virt_ext = LBR_CTL_ENABLE_MASK;
	vmcb->save.dbgctl = DEBUGCTLMSR_LBR;

	wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR);
	DO_BRANCH(host_branch3);
	SVM_BARE_VMRUN;
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);

	if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
		REPORT_GUEST_LBR_ERROR(vmcb);
		return;
	}

	if (vmcb->save.dbgctl != 0) {
		report(false, "unexpected virtual guest MSR_IA32_DEBUGCTLMSR value 0x%lx", vmcb->save.dbgctl);
		return;
	}

	TEST_EXPECT_EQ(dbgctl, DEBUGCTLMSR_LBR);
	HOST_CHECK_LBR(&host_branch3_from, &host_branch3_to);
}

static void svm_lbrv_nested_test2(void)
{
	if (!lbrv_supported()) {
		report_skip("LBRV not supported in the guest");
		return;
	}

	report(true, "Test that with LBRV enabled, guest LBR state doesn't leak (2)");
	svm_setup_vmrun((u64)svm_lbrv_test_guest2);
	vmcb->control.virt_ext = LBR_CTL_ENABLE_MASK;

	vmcb->save.dbgctl = 0;
	vmcb->save.br_from = (u64)&host_branch2_from;
	vmcb->save.br_to = (u64)&host_branch2_to;

	wrmsr(MSR_IA32_DEBUGCTLMSR, DEBUGCTLMSR_LBR);
	DO_BRANCH(host_branch4);
	SVM_BARE_VMRUN;
	dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
	wrmsr(MSR_IA32_DEBUGCTLMSR, 0);

	if (vmcb->control.exit_code != SVM_EXIT_VMMCALL) {
		REPORT_GUEST_LBR_ERROR(vmcb);
		return;
	}

	TEST_EXPECT_EQ(dbgctl, DEBUGCTLMSR_LBR);
	HOST_CHECK_LBR(&host_branch4_from, &host_branch4_to);
}


// test that a nested guest which does enable INTR interception
// but doesn't enable virtual interrupt masking works

static volatile int dummy_isr_recevied;
static void dummy_isr(isr_regs_t *regs)
{
	dummy_isr_recevied++;
	eoi();
}


static volatile int nmi_recevied;
static void dummy_nmi_handler(struct ex_regs *regs)
{
	nmi_recevied++;
}


static void svm_intr_intercept_mix_run_guest(volatile int *counter, int expected_vmexit)
{
	if (counter)
		*counter = 0;

	sti();  // host IF value should not matter
	clgi(); // vmrun will set back GIF to 1

	svm_vmrun();

	if (counter)
		report(!*counter, "No interrupt expected");

	stgi();

	if (counter)
		report(*counter == 1, "Interrupt is expected");

	report(vmcb->control.exit_code == expected_vmexit,
	       "Wanted VM-Exit reason 0x%x, got 0x%x",
	       expected_vmexit, vmcb->control.exit_code);
	report(vmcb->save.rflags & X86_EFLAGS_IF, "Guest should have EFLAGS.IF set now");
	cli();
}


// subtest: test that enabling EFLAGS.IF is enough to trigger an interrupt
static void svm_intr_intercept_mix_if_guest(struct svm_test *test)
{
	asm volatile("nop;nop;nop;nop");
	report(!dummy_isr_recevied, "No interrupt expected");
	sti_nop();
	report(0, "must not reach here");
}

static void svm_intr_intercept_mix_if(void)
{
	// make a physical interrupt to be pending
	handle_irq(0x55, dummy_isr);

	vmcb->control.intercept |= (1 << INTERCEPT_INTR);
	vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
	vmcb->save.rflags &= ~X86_EFLAGS_IF;

	test_set_guest(svm_intr_intercept_mix_if_guest);
	cli();
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | 0x55, 0);
	svm_intr_intercept_mix_run_guest(&dummy_isr_recevied, SVM_EXIT_INTR);
}


// subtest: test that a clever guest can trigger an interrupt by setting GIF
// if GIF is not intercepted
static void svm_intr_intercept_mix_gif_guest(struct svm_test *test)
{

	asm volatile("nop;nop;nop;nop");
	report(!dummy_isr_recevied, "No interrupt expected");

	// clear GIF and enable IF
	// that should still not cause VM exit
	clgi();
	sti_nop();
	report(!dummy_isr_recevied, "No interrupt expected");

	stgi();
	report(0, "must not reach here");
}

static void svm_intr_intercept_mix_gif(void)
{
	handle_irq(0x55, dummy_isr);

	vmcb->control.intercept |= (1 << INTERCEPT_INTR);
	vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
	vmcb->save.rflags &= ~X86_EFLAGS_IF;

	test_set_guest(svm_intr_intercept_mix_gif_guest);
	cli();
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | 0x55, 0);
	svm_intr_intercept_mix_run_guest(&dummy_isr_recevied, SVM_EXIT_INTR);
}

// subtest: test that a clever guest can trigger an interrupt by setting GIF
// if GIF is not intercepted and interrupt comes after guest
// started running
static void svm_intr_intercept_mix_gif_guest2(struct svm_test *test)
{
	asm volatile("nop;nop;nop;nop");
	report(!dummy_isr_recevied, "No interrupt expected");

	clgi();
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_FIXED | 0x55, 0);
	report(!dummy_isr_recevied, "No interrupt expected");

	stgi();
	report(0, "must not reach here");
}

static void svm_intr_intercept_mix_gif2(void)
{
	handle_irq(0x55, dummy_isr);

	vmcb->control.intercept |= (1 << INTERCEPT_INTR);
	vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
	vmcb->save.rflags |= X86_EFLAGS_IF;

	test_set_guest(svm_intr_intercept_mix_gif_guest2);
	svm_intr_intercept_mix_run_guest(&dummy_isr_recevied, SVM_EXIT_INTR);
}


// subtest: test that pending NMI will be handled when guest enables GIF
static void svm_intr_intercept_mix_nmi_guest(struct svm_test *test)
{
	asm volatile("nop;nop;nop;nop");
	report(!nmi_recevied, "No NMI expected");
	cli(); // should have no effect

	clgi();
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_NMI, 0);
	sti_nop(); // should have no effect
	report(!nmi_recevied, "No NMI expected");

	stgi();
	report(0, "must not reach here");
}

static void svm_intr_intercept_mix_nmi(void)
{
	handle_exception(2, dummy_nmi_handler);

	vmcb->control.intercept |= (1 << INTERCEPT_NMI);
	vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
	vmcb->save.rflags |= X86_EFLAGS_IF;

	test_set_guest(svm_intr_intercept_mix_nmi_guest);
	svm_intr_intercept_mix_run_guest(&nmi_recevied, SVM_EXIT_NMI);
}

// test that pending SMI will be handled when guest enables GIF
// TODO: can't really count #SMIs so just test that guest doesn't hang
// and VMexits on SMI
static void svm_intr_intercept_mix_smi_guest(struct svm_test *test)
{
	asm volatile("nop;nop;nop;nop");

	clgi();
	apic_icr_write(APIC_DEST_SELF | APIC_DEST_PHYSICAL | APIC_DM_SMI, 0);
	sti_nop(); // should have no effect
	stgi();
	report(0, "must not reach here");
}

static void svm_intr_intercept_mix_smi(void)
{
	vmcb->control.intercept |= (1 << INTERCEPT_SMI);
	vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
	test_set_guest(svm_intr_intercept_mix_smi_guest);
	svm_intr_intercept_mix_run_guest(NULL, SVM_EXIT_SMI);
}

static void svm_l2_ac_test(void)
{
	bool hit_ac = false;

	write_cr0(read_cr0() | X86_CR0_AM);
	write_rflags(read_rflags() | X86_EFLAGS_AC);

	run_in_user(generate_usermode_ac, AC_VECTOR, 0, 0, 0, 0, &hit_ac);
	report(hit_ac, "Usermode #AC handled in L2");
	vmmcall();
}

struct svm_exception_test {
	u8 vector;
	void (*guest_code)(void);
};

struct svm_exception_test svm_exception_tests[] = {
	{ GP_VECTOR, generate_non_canonical_gp },
	{ UD_VECTOR, generate_ud },
	{ DE_VECTOR, generate_de },
	{ DB_VECTOR, generate_single_step_db },
	{ BP_VECTOR, generate_bp },
	{ AC_VECTOR, svm_l2_ac_test },
	{ OF_VECTOR, generate_of },
	{ NM_VECTOR, generate_cr0_ts_nm },
	{ NM_VECTOR, generate_cr0_em_nm },
};

static u8 svm_exception_test_vector;

static void svm_exception_handler(struct ex_regs *regs)
{
	report(regs->vector == svm_exception_test_vector,
		"Handling %s in L2's exception handler",
		exception_mnemonic(svm_exception_test_vector));
	vmmcall();
}

static void handle_exception_in_l2(u8 vector)
{
	handler old_handler = handle_exception(vector, svm_exception_handler);
	svm_exception_test_vector = vector;

	report(svm_vmrun() == SVM_EXIT_VMMCALL,
		"%s handled by L2", exception_mnemonic(vector));

	handle_exception(vector, old_handler);
}

static void handle_exception_in_l1(u32 vector)
{
	u32 old_ie = vmcb->control.intercept_exceptions;

	vmcb->control.intercept_exceptions |= (1ULL << vector);

	report(svm_vmrun() == (SVM_EXIT_EXCP_BASE + vector),
		"%s handled by L1",  exception_mnemonic(vector));

	vmcb->control.intercept_exceptions = old_ie;
}

static void svm_exception_test(void)
{
	struct svm_exception_test *t;
	int i;

	for (i = 0; i < ARRAY_SIZE(svm_exception_tests); i++) {
		t = &svm_exception_tests[i];
		test_set_guest((test_guest_func)t->guest_code);

		handle_exception_in_l2(t->vector);
		vmcb_ident(vmcb);

		handle_exception_in_l1(t->vector);
		vmcb_ident(vmcb);
	}
}

static void shutdown_intercept_test_guest(struct svm_test *test)
{
	asm volatile ("ud2");
	report_fail("should not reach here\n");

}

static void svm_shutdown_intercept_test(void)
{
	test_set_guest(shutdown_intercept_test_guest);
	vmcb->save.idtr.base = (u64)alloc_vpage();
	vmcb->control.intercept |= (1ULL << INTERCEPT_SHUTDOWN);
	svm_vmrun();
	report(vmcb->control.exit_code == SVM_EXIT_SHUTDOWN, "shutdown test passed");
}

struct svm_test svm_tests[] = {
	{ "null", default_supported, default_prepare,
	  default_prepare_gif_clear, null_test,
	  default_finished, null_check },
	{ "vmrun", default_supported, default_prepare,
	  default_prepare_gif_clear, test_vmrun,
	  default_finished, check_vmrun },
	{ "ioio", default_supported, prepare_ioio,
	  default_prepare_gif_clear, test_ioio,
	  ioio_finished, check_ioio },
	{ "vmrun intercept check", default_supported, prepare_no_vmrun_int,
	  default_prepare_gif_clear, null_test, default_finished,
	  check_no_vmrun_int },
	{ "rsm", default_supported,
	  prepare_rsm_intercept, default_prepare_gif_clear,
	  test_rsm_intercept, finished_rsm_intercept, check_rsm_intercept },
	{ "cr3 read intercept", default_supported,
	  prepare_cr3_intercept, default_prepare_gif_clear,
	  test_cr3_intercept, default_finished, check_cr3_intercept },
	{ "cr3 read nointercept", default_supported, default_prepare,
	  default_prepare_gif_clear, test_cr3_intercept, default_finished,
	  check_cr3_nointercept },
	{ "cr3 read intercept emulate", smp_supported,
	  prepare_cr3_intercept_bypass, default_prepare_gif_clear,
	  test_cr3_intercept_bypass, default_finished, check_cr3_intercept },
	{ "dr intercept check", default_supported, prepare_dr_intercept,
	  default_prepare_gif_clear, test_dr_intercept, dr_intercept_finished,
	  check_dr_intercept },
	{ "next_rip", next_rip_supported, prepare_next_rip,
	  default_prepare_gif_clear, test_next_rip,
	  default_finished, check_next_rip },
	{ "msr intercept check", default_supported, prepare_msr_intercept,
	  default_prepare_gif_clear, test_msr_intercept,
	  msr_intercept_finished, check_msr_intercept },
	{ "mode_switch", default_supported, prepare_mode_switch,
	  default_prepare_gif_clear, test_mode_switch,
	  mode_switch_finished, check_mode_switch },
	{ "asid_zero", default_supported, prepare_asid_zero,
	  default_prepare_gif_clear, test_asid_zero,
	  default_finished, check_asid_zero },
	{ "sel_cr0_bug", default_supported, sel_cr0_bug_prepare,
	  default_prepare_gif_clear, sel_cr0_bug_test,
	  sel_cr0_bug_finished, sel_cr0_bug_check },
	{ "tsc_adjust", tsc_adjust_supported, tsc_adjust_prepare,
	  default_prepare_gif_clear, tsc_adjust_test,
	  default_finished, tsc_adjust_check },
	{ "latency_run_exit", default_supported, latency_prepare,
	  default_prepare_gif_clear, latency_test,
	  latency_finished, latency_check },
	{ "latency_run_exit_clean", default_supported, latency_prepare,
	  default_prepare_gif_clear, latency_test,
	  latency_finished_clean, latency_check },
	{ "latency_svm_insn", default_supported, lat_svm_insn_prepare,
	  default_prepare_gif_clear, null_test,
	  lat_svm_insn_finished, lat_svm_insn_check },
	{ "exc_inject", default_supported, exc_inject_prepare,
	  default_prepare_gif_clear, exc_inject_test,
	  exc_inject_finished, exc_inject_check },
	{ "pending_event", default_supported, pending_event_prepare,
	  default_prepare_gif_clear,
	  pending_event_test, pending_event_finished, pending_event_check },
	{ "pending_event_cli", default_supported, pending_event_cli_prepare,
	  pending_event_cli_prepare_gif_clear,
	  pending_event_cli_test, pending_event_cli_finished,
	  pending_event_cli_check },
	{ "interrupt", default_supported, interrupt_prepare,
	  default_prepare_gif_clear, interrupt_test,
	  interrupt_finished, interrupt_check },
	{ "nmi", default_supported, nmi_prepare,
	  default_prepare_gif_clear, nmi_test,
	  nmi_finished, nmi_check },
	{ "nmi_hlt", smp_supported, nmi_prepare,
	  default_prepare_gif_clear, nmi_hlt_test,
	  nmi_hlt_finished, nmi_hlt_check },
        { "vnmi", vnmi_supported, vnmi_prepare,
          default_prepare_gif_clear, vnmi_test,
          vnmi_finished, vnmi_check },
	{ "virq_inject", default_supported, virq_inject_prepare,
	  default_prepare_gif_clear, virq_inject_test,
	  virq_inject_finished, virq_inject_check },
	{ "virq_inject_within_shadow", default_supported, virq_inject_within_shadow_prepare,
	  virq_inject_within_shadow_prepare_gif_clear, virq_inject_within_shadow_test,
	  virq_inject_within_shadow_finished, virq_inject_within_shadow_check },
	{ "reg_corruption", default_supported, reg_corruption_prepare,
	  default_prepare_gif_clear, reg_corruption_test,
	  reg_corruption_finished, reg_corruption_check },
	{ "svm_init_startup_test", smp_supported, init_startup_prepare,
	  default_prepare_gif_clear, null_test,
	  init_startup_finished, init_startup_check },
	{ "svm_init_intercept_test", smp_supported, init_intercept_prepare,
	  default_prepare_gif_clear, init_intercept_test,
	  init_intercept_finished, init_intercept_check, .on_vcpu = 2 },
	{ "host_rflags", default_supported, host_rflags_prepare,
	  host_rflags_prepare_gif_clear, host_rflags_test,
	  host_rflags_finished, host_rflags_check },
	{ "vgif", vgif_supported, prepare_vgif_enabled,
	  default_prepare_gif_clear, test_vgif, vgif_finished,
	  vgif_check },
	TEST(svm_cr4_osxsave_test),
	TEST(svm_guest_state_test),
	TEST(svm_vmrun_errata_test),
	TEST(svm_vmload_vmsave),
	TEST(svm_test_singlestep),
	TEST(svm_no_nm_test),
	TEST(svm_exception_test),
	TEST(svm_lbrv_test0),
	TEST(svm_lbrv_test1),
	TEST(svm_lbrv_test2),
	TEST(svm_lbrv_nested_test1),
	TEST(svm_lbrv_nested_test2),
	TEST(svm_intr_intercept_mix_if),
	TEST(svm_intr_intercept_mix_gif),
	TEST(svm_intr_intercept_mix_gif2),
	TEST(svm_intr_intercept_mix_nmi),
	TEST(svm_intr_intercept_mix_smi),
	TEST(svm_tsc_scale_test),
	TEST(pause_filter_test),
	TEST(svm_shutdown_intercept_test),
	{ NULL, NULL, NULL, NULL, NULL, NULL, NULL }
};

int main(int ac, char **av)
{
	setup_vm();
	return run_svm_tests(ac, av, svm_tests);
}