lkml.org 
[lkml]   [2020]   [Feb]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v2 2/2] selftests: KVM: SVM: Add vmcall test
Date
Eric Auger <eric.auger@redhat.com> writes:

> L2 guest calls vmcall and L1 checks the exit status does
> correspond.
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> ---
> tools/testing/selftests/kvm/Makefile | 1 +
> .../selftests/kvm/x86_64/svm_vmcall_test.c | 86 +++++++++++++++++++
> 2 files changed, 87 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 2e770f554cae..b529d3b42c02 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..75e66f3bbbc0
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/x86_64/svm_vmcall_test.c
> @@ -0,0 +1,86 @@
> +// 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.h"
> +
> +#include <string.h>
> +#include <sys/ioctl.h>
> +
> +#include "kselftest.h"
> +#include <linux/kernel.h>
> +
> +#define VCPU_ID 5
> +
> +/* The virtual machine object. */

I'm not sure this comment is any helpful, the virus is probably
spreading from vmx_close_while_nested_test.c/vmx_tsc_adjust_test.c :-)

> +static struct kvm_vm *vm;
> +
> +static inline void l2_vmcall(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_vmcall,
> + &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: Vitaly Kuznetsov <vkuznets@redhat.com>

Thanks!

--
Vitaly

\
 
 \ /
  Last update: 2020-02-03 10:45    [W:0.076 / U:2.868 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site