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SubjectRe: [PATCH v5 4/4] selftests: KVM: SVM: Add vmcall test
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On 2/7/20 6:27 AM, Eric Auger wrote:
> L2 guest calls vmcall and L1 checks the exit status does
> correspond.
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
>
> ---
>
> v4 -> v5:
> - rename l2_vmcall into l2_guest_code
>
> v3 -> v4:
> - remove useless includes
> - collected Lin's R-b
>
> v2 -> v3:
> - remove useless comment and add Vitaly's R-b
> ---
> tools/testing/selftests/kvm/Makefile | 1 +
> .../selftests/kvm/x86_64/svm_vmcall_test.c | 79 +++++++++++++++++++
> 2 files changed, 80 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index fb2fa62d7dd5..d91c53b726e6 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -26,6 +26,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
> TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
> TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
> TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
> TEST_GEN_PROGS_x86_64 += clear_dirty_log_test
> TEST_GEN_PROGS_x86_64 += dirty_log_test
> TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
> diff --git a/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c b/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c
> new file mode 100644
> index 000000000000..d74ab0cc06d0
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c
> @@ -0,0 +1,79 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * svm_vmcall_test
> + *
> + * Copyright (C) 2020, Red Hat, Inc.
> + *
> + * Nested SVM testing: VMCALL
> + */
> +
> +#include "test_util.h"
> +#include "kvm_util.h"
> +#include "processor.h"
> +#include "svm_util.h"
> +
> +#define VCPU_ID 5
> +
> +static struct kvm_vm *vm;
> +
> +static inline void l2_guest_code(struct svm_test_data *svm)
> +{
> + __asm__ __volatile__("vmcall");
> +}
> +
> +static void l1_guest_code(struct svm_test_data *svm)
> +{
> + #define L2_GUEST_STACK_SIZE 64
> + unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
> + struct vmcb *vmcb = svm->vmcb;
> +
> + /* Prepare for L2 execution. */
> + generic_svm_setup(svm, l2_guest_code,
> + &l2_guest_stack[L2_GUEST_STACK_SIZE]);
> +
> + run_guest(vmcb, svm->vmcb_gpa);
> +
> + GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
> + GUEST_DONE();
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + vm_vaddr_t svm_gva;
> +
> + nested_svm_check_supported();
> +
> + vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
> + vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
> +
> + vcpu_alloc_svm(vm, &svm_gva);
> + vcpu_args_set(vm, VCPU_ID, 1, svm_gva);
> +
> + for (;;) {
> + volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
> + struct ucall uc;
> +
> + vcpu_run(vm, VCPU_ID);
> + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
> + "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
> + run->exit_reason,
> + exit_reason_str(run->exit_reason));
> +
> + switch (get_ucall(vm, VCPU_ID, &uc)) {
> + case UCALL_ABORT:
> + TEST_ASSERT(false, "%s",
> + (const char *)uc.args[0]);
> + /* NOT REACHED */
> + case UCALL_SYNC:
> + break;
> + case UCALL_DONE:
> + goto done;
> + default:
> + TEST_ASSERT(false,
> + "Unknown ucall 0x%x.", uc.cmd);
> + }
> + }
> +done:
> + kvm_vm_free(vm);
> + return 0;
> +}
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>

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