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KVM: selftests: Add a test for L2 clearing EFER.SVME without intercept

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Add a test that verifies KVM's newly introduced behavior of synthesizing
a triple fault in L1 if L2 clears EFER.SVME without an L1 interception
(which is architecturally undefined).

Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20260209195142.2554532-3-yosry.ahmed@linux.dev
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yosry Ahmed 2026-02-09 19:51:42 +00:00 committed by Sean Christopherson
parent cdc69269b1
commit 3900e56eb1
2 changed files with 56 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile.kvm
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@ -110,6 +110,7 @@ TEST_GEN_PROGS_x86 += x86/state_test
TEST_GEN_PROGS_x86 += x86/vmx_preemption_timer_test
TEST_GEN_PROGS_x86 += x86/svm_vmcall_test
TEST_GEN_PROGS_x86 += x86/svm_int_ctl_test
TEST_GEN_PROGS_x86 += x86/svm_nested_clear_efer_svme
TEST_GEN_PROGS_x86 += x86/svm_nested_invalid_vmcb12_gpa
TEST_GEN_PROGS_x86 += x86/svm_nested_shutdown_test
TEST_GEN_PROGS_x86 += x86/svm_nested_soft_inject_test

55
tools/testing/selftests/kvm/x86/svm_nested_clear_efer_svme.c Normal file
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@ -0,0 +1,55 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2026, Google LLC.
*/
#include "kvm_util.h"
#include "vmx.h"
#include "svm_util.h"
#include "kselftest.h"
#define L2_GUEST_STACK_SIZE 64
static void l2_guest_code(void)
{
unsigned long efer = rdmsr(MSR_EFER);
/* generic_svm_setup() initializes EFER_SVME set for L2 */
GUEST_ASSERT(efer & EFER_SVME);
wrmsr(MSR_EFER, efer & ~EFER_SVME);
/* Unreachable, L1 should be shutdown */
GUEST_ASSERT(0);
}
static void l1_guest_code(struct svm_test_data *svm)
{
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
generic_svm_setup(svm, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
run_guest(svm->vmcb, svm->vmcb_gpa);
/* Unreachable, L1 should be shutdown */
GUEST_ASSERT(0);
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
vm_vaddr_t nested_gva = 0;
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
vcpu_alloc_svm(vm, &nested_gva);
vcpu_args_set(vcpu, 1, nested_gva);
vcpu_run(vcpu);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SHUTDOWN);
kvm_vm_free(vm);
return 0;
}