tools/testing/selftests/kvm/s390x/sync_regs_test.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Test for s390x KVM_CAP_SYNC_REGS
   4  *
   5  * Based on the same test for x86:
   6  * Copyright (C) 2018, Google LLC.
   7  *
   8  * Adaptions for s390x:
   9  * Copyright (C) 2019, Red Hat, Inc.
  10  *
  11  * Test expected behavior of the KVM_CAP_SYNC_REGS functionality.
  12  */
  13
  14 #define _GNU_SOURCE /* for program_invocation_short_name */
  15 #include <fcntl.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <sys/ioctl.h>
  20
  21 #include "test_util.h"
  22 #include "kvm_util.h"
  23
  24 #define VCPU_ID 5
  25
  26 static void guest_code(void)
  27 {
  28         /*
  29          * We embed diag 501 here instead of doing a ucall to avoid that
  30          * the compiler has messed with r11 at the time of the ucall.
  31          */
  32         asm volatile (
  33                 "0:     diag 0,0,0x501\n"
  34                 "       ahi 11,1\n"
  35                 "       j 0b\n"
  36         );
  37 }
  38
  39 #define REG_COMPARE(reg) \
  40         TEST_ASSERT(left->reg == right->reg, \
  41                     "Register " #reg \
  42                     " values did not match: 0x%llx, 0x%llx\n", \
  43                     left->reg, right->reg)
  44
  45 static void compare_regs(struct kvm_regs *left, struct kvm_sync_regs *right)
  46 {
  47         int i;
  48
  49         for (i = 0; i < 16; i++)
  50                 REG_COMPARE(gprs[i]);
  51 }
  52
  53 static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)
  54 {
  55         int i;
  56
  57         for (i = 0; i < 16; i++)
  58                 REG_COMPARE(acrs[i]);
  59
  60         for (i = 0; i < 16; i++)
  61                 REG_COMPARE(crs[i]);
  62 }
  63
  64 #undef REG_COMPARE
  65
  66 #define TEST_SYNC_FIELDS   (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS)
  67 #define INVALID_SYNC_FIELD 0x80000000
  68
  69 int main(int argc, char *argv[])
  70 {
  71         struct kvm_vm *vm;
  72         struct kvm_run *run;
  73         struct kvm_regs regs;
  74         struct kvm_sregs sregs;
  75         int rv, cap;
  76
  77         /* Tell stdout not to buffer its content */
  78         setbuf(stdout, NULL);
  79
  80         cap = kvm_check_cap(KVM_CAP_SYNC_REGS);
  81         if (!cap) {
  82                 fprintf(stderr, "CAP_SYNC_REGS not supported, skipping test\n");
  83                 exit(KSFT_SKIP);
  84         }
  85
  86         /* Create VM */
  87         vm = vm_create_default(VCPU_ID, 0, guest_code);
  88
  89         run = vcpu_state(vm, VCPU_ID);
  90
  91         /* Request reading invalid register set from VCPU. */
  92         run->kvm_valid_regs = INVALID_SYNC_FIELD;
  93         rv = _vcpu_run(vm, VCPU_ID);
  94         TEST_ASSERT(rv < 0 && errno == EINVAL,
  95                     "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
  96                     rv);
  97         vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;
  98
  99         run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
 100         rv = _vcpu_run(vm, VCPU_ID);
 101         TEST_ASSERT(rv < 0 && errno == EINVAL,
 102                     "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
 103                     rv);
 104         vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;
 105
 106         /* Request setting invalid register set into VCPU. */
 107         run->kvm_dirty_regs = INVALID_SYNC_FIELD;
 108         rv = _vcpu_run(vm, VCPU_ID);
 109         TEST_ASSERT(rv < 0 && errno == EINVAL,
 110                     "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
 111                     rv);
 112         vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;
 113
 114         run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
 115         rv = _vcpu_run(vm, VCPU_ID);
 116         TEST_ASSERT(rv < 0 && errno == EINVAL,
 117                     "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
 118                     rv);
 119         vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;
 120
 121         /* Request and verify all valid register sets. */
 122         run->kvm_valid_regs = TEST_SYNC_FIELDS;
 123         rv = _vcpu_run(vm, VCPU_ID);
 124         TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
 125         TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
 126                     "Unexpected exit reason: %u (%s)\n",
 127                     run->exit_reason,
 128                     exit_reason_str(run->exit_reason));
 129         TEST_ASSERT(run->s390_sieic.icptcode == 4 &&
 130                     (run->s390_sieic.ipa >> 8) == 0x83 &&
 131                     (run->s390_sieic.ipb >> 16) == 0x501,
 132                     "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x\n",
 133                     run->s390_sieic.icptcode, run->s390_sieic.ipa,
 134                     run->s390_sieic.ipb);
 135
 136         vcpu_regs_get(vm, VCPU_ID, &regs);
 137         compare_regs(&regs, &run->s.regs);
 138
 139         vcpu_sregs_get(vm, VCPU_ID, &sregs);
 140         compare_sregs(&sregs, &run->s.regs);
 141
 142         /* Set and verify various register values */
 143         run->s.regs.gprs[11] = 0xBAD1DEA;
 144         run->s.regs.acrs[0] = 1 << 11;
 145
 146         run->kvm_valid_regs = TEST_SYNC_FIELDS;
 147         run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;
 148         rv = _vcpu_run(vm, VCPU_ID);
 149         TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
 150         TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
 151                     "Unexpected exit reason: %u (%s)\n",
 152                     run->exit_reason,
 153                     exit_reason_str(run->exit_reason));
 154         TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1,
 155                     "r11 sync regs value incorrect 0x%llx.",
 156                     run->s.regs.gprs[11]);
 157         TEST_ASSERT(run->s.regs.acrs[0]  == 1 << 11,
 158                     "acr0 sync regs value incorrect 0x%llx.",
 159                     run->s.regs.acrs[0]);
 160
 161         vcpu_regs_get(vm, VCPU_ID, &regs);
 162         compare_regs(&regs, &run->s.regs);
 163
 164         vcpu_sregs_get(vm, VCPU_ID, &sregs);
 165         compare_sregs(&sregs, &run->s.regs);
 166
 167         /* Clear kvm_dirty_regs bits, verify new s.regs values are
 168          * overwritten with existing guest values.
 169          */
 170         run->kvm_valid_regs = TEST_SYNC_FIELDS;
 171         run->kvm_dirty_regs = 0;
 172         run->s.regs.gprs[11] = 0xDEADBEEF;
 173         rv = _vcpu_run(vm, VCPU_ID);
 174         TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
 175         TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
 176                     "Unexpected exit reason: %u (%s)\n",
 177                     run->exit_reason,
 178                     exit_reason_str(run->exit_reason));
 179         TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,
 180                     "r11 sync regs value incorrect 0x%llx.",
 181                     run->s.regs.gprs[11]);
 182
 183         kvm_vm_free(vm);
 184
 185         return 0;
 186 }