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 <sclp.h> 20 #include <sie.h> 21 #include <snippet.h> 22 23 static struct vm vm; 24 25 static uint8_t *src; 26 static uint8_t *dst; 27 static uint8_t *cmp; 28 29 static void test_mvpg_pei(void) 30 { 31 uint64_t **pei_dst = (uint64_t **)((uintptr_t) vm.sblk + 0xc0); 32 uint64_t **pei_src = (uint64_t **)((uintptr_t) vm.sblk + 0xc8); 33 34 report_prefix_push("pei"); 35 36 report_prefix_push("src"); 37 memset(dst, 0, PAGE_SIZE); 38 protect_page(src, PAGE_ENTRY_I); 39 sie(&vm); 40 report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution"); 41 report((uintptr_t)**pei_src == (uintptr_t)src + PAGE_ENTRY_I, "PEI_SRC correct"); 42 report((uintptr_t)**pei_dst == (uintptr_t)dst, "PEI_DST correct"); 43 unprotect_page(src, PAGE_ENTRY_I); 44 report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact"); 45 /* 46 * We need to execute the diag44 which is used as a blocker 47 * behind the mvpg. It makes sure we fail the tests above if 48 * the mvpg wouldn't have intercepted. 49 */ 50 sie(&vm); 51 /* Make sure we intercepted for the diag44 and nothing else */ 52 assert(vm.sblk->icptcode == ICPT_INST && 53 vm.sblk->ipa == 0x8300 && vm.sblk->ipb == 0x440000); 54 report_prefix_pop(); 55 56 /* Clear PEI data for next check */ 57 report_prefix_push("dst"); 58 memset((uint64_t *)((uintptr_t) vm.sblk + 0xc0), 0, 16); 59 memset(dst, 0, PAGE_SIZE); 60 protect_page(dst, PAGE_ENTRY_I); 61 sie(&vm); 62 report(vm.sblk->icptcode == ICPT_PARTEXEC, "Partial execution"); 63 report((uintptr_t)**pei_src == (uintptr_t)src, "PEI_SRC correct"); 64 report((uintptr_t)**pei_dst == (uintptr_t)dst + PAGE_ENTRY_I, "PEI_DST correct"); 65 /* Needed for the memcmp and general cleanup */ 66 unprotect_page(dst, PAGE_ENTRY_I); 67 report(!memcmp(cmp, dst, PAGE_SIZE), "Destination intact"); 68 report_prefix_pop(); 69 70 report_prefix_pop(); 71 } 72 73 static void test_mvpg(void) 74 { 75 memset(src, 0x42, PAGE_SIZE); 76 memset(dst, 0x43, PAGE_SIZE); 77 sie(&vm); 78 report(!memcmp(src, dst, PAGE_SIZE) && *dst == 0x42, "Page moved"); 79 } 80 81 static void setup_guest(void) 82 { 83 extern const char SNIPPET_NAME_START(c, mvpg_snippet)[]; 84 extern const char SNIPPET_NAME_END(c, mvpg_snippet)[]; 85 86 setup_vm(); 87 88 snippet_setup_guest(&vm, false); 89 snippet_init(&vm, SNIPPET_NAME_START(c, mvpg_snippet), 90 SNIPPET_LEN(c, mvpg_snippet), SNIPPET_UNPACK_OFF); 91 92 /* Enable MVPG interpretation as we want to test KVM and not ourselves */ 93 vm.sblk->eca = ECA_MVPGI; 94 95 src = (uint8_t *) vm.sblk->mso + PAGE_SIZE * 6; 96 dst = (uint8_t *) vm.sblk->mso + PAGE_SIZE * 5; 97 cmp = alloc_page(); 98 memset(cmp, 0, PAGE_SIZE); 99 } 100 101 int main(void) 102 { 103 report_prefix_push("mvpg-sie"); 104 if (!sclp_facilities.has_sief2) { 105 report_skip("SIEF2 facility unavailable"); 106 goto done; 107 } 108 109 setup_guest(); 110 test_mvpg(); 111 test_mvpg_pei(); 112 sie_guest_destroy(&vm); 113 114 done: 115 report_prefix_pop(); 116 return report_summary(); 117 118 } 119