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KVM: selftests: evmcs_test: Test that KVM_STATE_NESTED_EVMCS is never lost 

Do KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE for a freshly restored VM
(before the first KVM_RUN) to check that KVM_STATE_NESTED_EVMCS is not
lost.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210526132026.270394-12-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-26 15:20:26 +02:00 committed by Paolo Bonzini
parent 8629b625e0
commit 8f7663cea2
1 changed files with 38 additions and 26 deletions
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64
tools/testing/selftests/kvm/x86_64/evmcs_test.c
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@ -112,14 +112,38 @@ void inject_nmi(struct kvm_vm *vm)
vcpu_events_set(vm, VCPU_ID, &events);
}
static void save_restore_vm(struct kvm_vm *vm)
{
struct kvm_regs regs1, regs2;
struct kvm_x86_state *state;
state = vcpu_save_state(vm, VCPU_ID);
memset(&regs1, 0, sizeof(regs1));
vcpu_regs_get(vm, VCPU_ID, &regs1);
kvm_vm_release(vm);
/* Restore state in a new VM. */
kvm_vm_restart(vm, O_RDWR);
vm_vcpu_add(vm, VCPU_ID);
vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
vcpu_load_state(vm, VCPU_ID, state);
free(state);
memset(&regs2, 0, sizeof(regs2));
vcpu_regs_get(vm, VCPU_ID, &regs2);
TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
"Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
(ulong) regs2.rdi, (ulong) regs2.rsi);
}
int main(int argc, char *argv[])
{
vm_vaddr_t vmx_pages_gva = 0;
struct kvm_regs regs1, regs2;
struct kvm_vm *vm;
struct kvm_run *run;
struct kvm_x86_state *state;
struct ucall uc;
int stage;
@ -136,10 +160,6 @@ int main(int argc, char *argv[])
vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
run = vcpu_state(vm, VCPU_ID);
vcpu_regs_get(vm, VCPU_ID, &regs1);
vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
@ -151,6 +171,7 @@ int main(int argc, char *argv[])
pr_info("Running L1 which uses EVMCS to run L2\n");
for (stage = 1;; stage++) {
run = vcpu_state(vm, VCPU_ID);
_vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Stage %d: unexpected exit reason: %u (%s),\n",
@ -175,32 +196,23 @@ int main(int argc, char *argv[])
uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
stage, (ulong)uc.args[1]);
state = vcpu_save_state(vm, VCPU_ID);
memset(&regs1, 0, sizeof(regs1));
vcpu_regs_get(vm, VCPU_ID, &regs1);
kvm_vm_release(vm);
/* Restore state in a new VM. */
kvm_vm_restart(vm, O_RDWR);
vm_vcpu_add(vm, VCPU_ID);
vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
vcpu_load_state(vm, VCPU_ID, state);
run = vcpu_state(vm, VCPU_ID);
free(state);
memset(&regs2, 0, sizeof(regs2));
vcpu_regs_get(vm, VCPU_ID, &regs2);
TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
"Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
(ulong) regs2.rdi, (ulong) regs2.rsi);
save_restore_vm(vm);
/* Force immediate L2->L1 exit before resuming */
if (stage == 8) {
pr_info("Injecting NMI into L1 before L2 had a chance to run after restore\n");
inject_nmi(vm);
}
/*
* Do KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE for a freshly
* restored VM (before the first KVM_RUN) to check that
* KVM_STATE_NESTED_EVMCS is not lost.
*/
if (stage == 9) {
pr_info("Trying extra KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE cycle\n");
save_restore_vm(vm);
}
}
done: