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KVM: selftests: Add a test for KVM_CAP_EXIT_ON_EMULATION_FAILURE

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Add a selftest to exercise the KVM_CAP_EXIT_ON_EMULATION_FAILURE
capability.

This capability is also exercised through
smaller_maxphyaddr_emulation_test, but that test requires
allow_smaller_maxphyaddr=Y, which is off by default on Intel when ept=Y
and unconditionally disabled on AMD when npt=Y. This new test ensures
that KVM_CAP_EXIT_ON_EMULATION_FAILURE is exercised independent of
allow_smaller_maxphyaddr.

Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20221102184654.282799-11-dmatlack@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
David Matlack
2022-11-02 11:46:54 -07:00
committed by Sean Christopherson
parent a323845d6c
commit 3ae5b759c3
3 changed files with 47 additions and 0 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@@ -17,6 +17,7 @@
/x86_64/cr4_cpuid_sync_test
/x86_64/debug_regs
/x86_64/evmcs_test
/x86_64/exit_on_emulation_failure_test
/x86_64/fix_hypercall_test
/x86_64/get_msr_index_features
/x86_64/kvm_clock_test

1
tools/testing/selftests/kvm/Makefile
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@@ -82,6 +82,7 @@ TEST_GEN_PROGS_x86_64 = x86_64/cpuid_test
TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test
TEST_GEN_PROGS_x86_64 += x86_64/get_msr_index_features
TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test
TEST_GEN_PROGS_x86_64 += x86_64/exit_on_emulation_failure_test
TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid

45
tools/testing/selftests/kvm/x86_64/exit_on_emulation_failure_test.c Normal file
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@@ -0,0 +1,45 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022, Google LLC.
*
* Test for KVM_CAP_EXIT_ON_EMULATION_FAILURE.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include "flds_emulation.h"
#include "test_util.h"
#define MMIO_GPA 0x700000000
#define MMIO_GVA MMIO_GPA
static void guest_code(void)
{
/* Execute flds with an MMIO address to force KVM to emulate it. */
flds(MMIO_GVA);
GUEST_DONE();
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
/* Tell stdout not to buffer its content */
setbuf(stdout, NULL);
TEST_REQUIRE(kvm_has_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE));
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vm_enable_cap(vm, KVM_CAP_EXIT_ON_EMULATION_FAILURE, 1);
virt_map(vm, MMIO_GVA, MMIO_GPA, 1);
vcpu_run(vcpu);
handle_flds_emulation_failure_exit(vcpu);
vcpu_run(vcpu);
ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_DONE);
kvm_vm_free(vm);
return 0;
}