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kvm: selftests: add svm nested shutdown test

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Add test that tests that on SVM if L1 doesn't intercept SHUTDOWN,
then L2 crashes L1 and doesn't crash L2

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-7-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2022-11-03 16:13:48 +02:00 • committed by Paolo Bonzini
parent fc6392d51d
commit 0bd2d3f487
3 changed files with 69 additions and 0 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@ -41,6 +41,7 @@
/x86_64/svm_vmcall_test
/x86_64/svm_int_ctl_test
/x86_64/svm_nested_soft_inject_test
/x86_64/svm_nested_shutdown_test
/x86_64/sync_regs_test
/x86_64/tsc_msrs_test
/x86_64/tsc_scaling_sync

1
tools/testing/selftests/kvm/Makefile
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@ -101,6 +101,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/state_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test

67
tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c Normal file
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@ -0,0 +1,67 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* svm_nested_shutdown_test
*
* Copyright (C) 2022, Red Hat, Inc.
*
* Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
*/
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "svm_util.h"
static void l2_guest_code(struct svm_test_data *svm)
{
__asm__ __volatile__("ud2");
}
static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
struct vmcb *vmcb = svm->vmcb;
generic_svm_setup(svm, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
idt[6].p = 0; // #UD is intercepted but its injection will cause #NP
idt[11].p = 0; // #NP is not intercepted and will cause another
// #NP that will be converted to #DF
idt[8].p = 0; // #DF will cause #NP which will cause SHUTDOWN
run_guest(vmcb, svm->vmcb_gpa);
/* should not reach here */
GUEST_ASSERT(0);
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_run *run;
vm_vaddr_t svm_gva;
struct kvm_vm *vm;
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
vcpu_alloc_svm(vm, &svm_gva);
vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
run = vcpu->run;
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
"Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
kvm_vm_free(vm);
}