1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Tests mvpg SIE partial execution intercepts. 4 * 5 * Copyright 2021 IBM Corp. 6 * 7 * Authors: 8 * Janosch Frank <frankja@linux.ibm.com> 9 */ 10 #include <libcflat.h> 11 #include <asm/asm-offsets.h> 12 #include <asm-generic/barrier.h> 13 #include <asm/pgtable.h> 14 #include <mmu.h> 15 #include <asm/page.h> 16 #include <asm/facility.h> 17 #include <asm/mem.h> 18 #include <alloc_page.h> 19 #include <vm.h> 20 #include <sclp.h> 21 #include <sie.h> 22 23 static u8 *guest; 24 static u8 *guest_instr; 25 static struct vm vm; 26 27 static uint8_t *src; 28 static uint8_t *dst; 29 static uint8_t *cmp; 30 31 extern const char _binary_s390x_snippets_c_mvpg_snippet_gbin_start[]; 32 extern const char _binary_s390x_snippets_c_mvpg_snippet_gbin_end[]; 33 int binary_size; 34 35 static void test_mvpg_pei(void) 36 { 37 uint64_t **pei_dst = (uint64_t **)((uintptr_t) vm.sblk + 0xc0); 38 uint64_t **pei_src = (uint64_t **)((uintptr_t) vm.sblk + 0xc8); 39 40 report_prefix_push("pei"); 41 42 report_prefix_push("src"); 43 memset(dst, 0, PAGE_SIZE); 44 protect_page(src, PAGE_ENTRY_I); 45 sie(&vm); 46 report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution"); 47 report((uintptr_t)**pei_src == (uintptr_t)src + PAGE_ENTRY_I, "PEI_SRC correct"); 48 report((uintptr_t)**pei_dst == (uintptr_t)dst, "PEI_DST correct"); 49 unprotect_page(src, PAGE_ENTRY_I); 50 report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact"); 51 /* 52 * We need to execute the diag44 which is used as a blocker 53 * behind the mvpg. It makes sure we fail the tests above if 54 * the mvpg wouldn't have intercepted. 55 */ 56 sie(&vm); 57 /* Make sure we intercepted for the diag44 and nothing else */ 58 assert(vm.sblk->icptcode == ICPT_INST && 59 vm.sblk->ipa == 0x8300 && vm.sblk->ipb == 0x440000); 60 report_prefix_pop(); 61 62 /* Clear PEI data for next check */ 63 report_prefix_push("dst"); 64 memset((uint64_t *)((uintptr_t) vm.sblk + 0xc0), 0, 16); 65 memset(dst, 0, PAGE_SIZE); 66 protect_page(dst, PAGE_ENTRY_I); 67 sie(&vm); 68 report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution"); 69 report((uintptr_t)**pei_src == (uintptr_t)src, "PEI_SRC correct"); 70 report((uintptr_t)**pei_dst == (uintptr_t)dst + PAGE_ENTRY_I, "PEI_DST correct"); 71 /* Needed for the memcmp and general cleanup */ 72 unprotect_page(dst, PAGE_ENTRY_I); 73 report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact"); 74 report_prefix_pop(); 75 76 report_prefix_pop(); 77 } 78 79 static void test_mvpg(void) 80 { 81 int binary_size = ((uintptr_t)_binary_s390x_snippets_c_mvpg_snippet_gbin_end - 82 (uintptr_t)_binary_s390x_snippets_c_mvpg_snippet_gbin_start); 83 84 memcpy(guest, _binary_s390x_snippets_c_mvpg_snippet_gbin_start, binary_size); 85 memset(src, 0x42, PAGE_SIZE); 86 memset(dst, 0x43, PAGE_SIZE); 87 sie(&vm); 88 report(!memcmp(src, dst, PAGE_SIZE) && *dst == 0x42, "Page moved"); 89 } 90 91 static void setup_guest(void) 92 { 93 setup_vm(); 94 95 /* Allocate 1MB as guest memory */ 96 guest = alloc_pages(8); 97 /* The first two pages are the lowcore */ 98 guest_instr = guest + PAGE_SIZE * 2; 99 100 sie_guest_create(&vm, (uint64_t)guest, HPAGE_SIZE); 101 102 vm.sblk->gpsw.addr = PAGE_SIZE * 4; 103 vm.sblk->gpsw.mask = PSW_MASK_64; 104 vm.sblk->ictl = ICTL_OPEREXC | ICTL_PINT; 105 /* Enable MVPG interpretation as we want to test KVM and not ourselves */ 106 vm.sblk->eca = ECA_MVPGI; 107 108 src = guest + PAGE_SIZE * 6; 109 dst = guest + PAGE_SIZE * 5; 110 cmp = alloc_page(); 111 memset(cmp, 0, PAGE_SIZE); 112 } 113 114 int main(void) 115 { 116 report_prefix_push("mvpg-sie"); 117 if (!sclp_facilities.has_sief2) { 118 report_skip("SIEF2 facility unavailable"); 119 goto done; 120 } 121 122 setup_guest(); 123 test_mvpg(); 124 test_mvpg_pei(); 125 sie_guest_destroy(&vm); 126 127 done: 128 report_prefix_pop(); 129 return report_summary(); 130 131 } 132