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 #include <snippet.h> 23 24 static struct vm vm; 25 26 static uint8_t *src; 27 static uint8_t *dst; 28 static uint8_t *cmp; 29 30 static void test_mvpg_pei(void) 31 { 32 uint64_t **pei_dst = (uint64_t **)((uintptr_t) vm.sblk + 0xc0); 33 uint64_t **pei_src = (uint64_t **)((uintptr_t) vm.sblk + 0xc8); 34 35 report_prefix_push("pei"); 36 37 report_prefix_push("src"); 38 memset(dst, 0, PAGE_SIZE); 39 protect_page(src, PAGE_ENTRY_I); 40 sie(&vm); 41 report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution"); 42 report((uintptr_t)**pei_src == (uintptr_t)src + PAGE_ENTRY_I, "PEI_SRC correct"); 43 report((uintptr_t)**pei_dst == (uintptr_t)dst, "PEI_DST correct"); 44 unprotect_page(src, PAGE_ENTRY_I); 45 report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact"); 46 /* 47 * We need to execute the diag44 which is used as a blocker 48 * behind the mvpg. It makes sure we fail the tests above if 49 * the mvpg wouldn't have intercepted. 50 */ 51 sie(&vm); 52 /* Make sure we intercepted for the diag44 and nothing else */ 53 assert(vm.sblk->icptcode == ICPT_INST && 54 vm.sblk->ipa == 0x8300 && vm.sblk->ipb == 0x440000); 55 report_prefix_pop(); 56 57 /* Clear PEI data for next check */ 58 report_prefix_push("dst"); 59 memset((uint64_t *)((uintptr_t) vm.sblk + 0xc0), 0, 16); 60 memset(dst, 0, PAGE_SIZE); 61 protect_page(dst, PAGE_ENTRY_I); 62 sie(&vm); 63 report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution"); 64 report((uintptr_t)**pei_src == (uintptr_t)src, "PEI_SRC correct"); 65 report((uintptr_t)**pei_dst == (uintptr_t)dst + PAGE_ENTRY_I, "PEI_DST correct"); 66 /* Needed for the memcmp and general cleanup */ 67 unprotect_page(dst, PAGE_ENTRY_I); 68 report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact"); 69 report_prefix_pop(); 70 71 report_prefix_pop(); 72 } 73 74 static void test_mvpg(void) 75 { 76 memset(src, 0x42, PAGE_SIZE); 77 memset(dst, 0x43, PAGE_SIZE); 78 sie(&vm); 79 report(!memcmp(src, dst, PAGE_SIZE) && *dst == 0x42, "Page moved"); 80 } 81 82 static void setup_guest(void) 83 { 84 extern const char SNIPPET_NAME_START(c, mvpg_snippet)[]; 85 extern const char SNIPPET_NAME_END(c, mvpg_snippet)[]; 86 87 setup_vm(); 88 89 snippet_setup_guest(&vm, false); 90 snippet_init(&vm, SNIPPET_NAME_START(c, mvpg_snippet), 91 SNIPPET_LEN(c, mvpg_snippet), SNIPPET_OFF_C); 92 93 /* Enable MVPG interpretation as we want to test KVM and not ourselves */ 94 vm.sblk->eca = ECA_MVPGI; 95 96 src = (uint8_t *) vm.sblk->mso + PAGE_SIZE * 6; 97 dst = (uint8_t *) vm.sblk->mso + PAGE_SIZE * 5; 98 cmp = alloc_page(); 99 memset(cmp, 0, PAGE_SIZE); 100 } 101 102 int main(void) 103 { 104 report_prefix_push("mvpg-sie"); 105 if (!sclp_facilities.has_sief2) { 106 report_skip("SIEF2 facility unavailable"); 107 goto done; 108 } 109 110 setup_guest(); 111 test_mvpg(); 112 test_mvpg_pei(); 113 sie_guest_destroy(&vm); 114 115 done: 116 report_prefix_pop(); 117 return report_summary(); 118 119 } 120