leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

kvm: tests: Add test to verify MSR_IA32_XSS

Browse Source 
Ensure that IA32_XSS appears in KVM_GET_MSR_INDEX_LIST if it can be set
to a non-zero value.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Change-Id: Ia2d644f69e2d6d8c27d7e0a7a45c2bf9c42bf5ff
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis 2019-10-21 16:30:28 -07:00 committed by Paolo Bonzini
parent 5229743619
commit c90992bfb0
5 changed files with 153 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/testing/selftests/kvm/.gitignore vendored
View File

@ -13,6 +13,7 @@
/x86_64/vmx_dirty_log_test
/x86_64/vmx_set_nested_state_test
/x86_64/vmx_tsc_adjust_test
/x86_64/xss_msr_test
/clear_dirty_log_test
/dirty_log_test
/kvm_create_max_vcpus

1
tools/testing/selftests/kvm/Makefile
View File

@ -25,6 +25,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test
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 += clear_dirty_log_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus

7
tools/testing/selftests/kvm/include/x86_64/processor.h
View File

@ -308,6 +308,8 @@ struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_x86_state *state);
struct kvm_msr_list *kvm_get_msr_index_list(void);
struct kvm_cpuid2 *kvm_get_supported_cpuid(void);
void vcpu_set_cpuid(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_cpuid2 *cpuid);
@ -322,10 +324,13 @@ kvm_get_supported_cpuid_entry(uint32_t function)
}
uint64_t vcpu_get_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index);
int _vcpu_set_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index,
uint64_t msr_value);
void vcpu_set_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index,
uint64_t msr_value);
uint32_t kvm_get_cpuid_max(void);
uint32_t kvm_get_cpuid_max_basic(void);
uint32_t kvm_get_cpuid_max_extended(void);
void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits);
/*

84
tools/testing/selftests/kvm/lib/x86_64/processor.c
View File

@ -869,6 +869,39 @@ uint64_t vcpu_get_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index)
return buffer.entry.data;
}
/* _VCPU Set MSR
*
* Input Args:
* vm - Virtual Machine
* vcpuid - VCPU ID
* msr_index - Index of MSR
* msr_value - New value of MSR
*
* Output Args: None
*
* Return: The result of KVM_SET_MSRS.
*
* Sets the value of an MSR for the given VCPU.
*/
int _vcpu_set_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index,
uint64_t msr_value)
{
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
struct {
struct kvm_msrs header;
struct kvm_msr_entry entry;
} buffer = {};
int r;
TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
memset(&buffer, 0, sizeof(buffer));
buffer.header.nmsrs = 1;
buffer.entry.index = msr_index;
buffer.entry.data = msr_value;
r = ioctl(vcpu->fd, KVM_SET_MSRS, &buffer.header);
return r;
}
/* VCPU Set MSR
*
* Input Args:
@ -886,19 +919,9 @@ uint64_t vcpu_get_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index)
void vcpu_set_msr(struct kvm_vm *vm, uint32_t vcpuid, uint64_t msr_index,
uint64_t msr_value)
{
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
struct {
struct kvm_msrs header;
struct kvm_msr_entry entry;
} buffer = {};
int r;
TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);
memset(&buffer, 0, sizeof(buffer));
buffer.header.nmsrs = 1;
buffer.entry.index = msr_index;
buffer.entry.data = msr_value;
r = ioctl(vcpu->fd, KVM_SET_MSRS, &buffer.header);
r = _vcpu_set_msr(vm, vcpuid, msr_index, msr_value);
TEST_ASSERT(r == 1, "KVM_SET_MSRS IOCTL failed,\n"
" rc: %i errno: %i", r, errno);
}
@ -1000,19 +1023,45 @@ struct kvm_x86_state {
struct kvm_msrs msrs;
};
static int kvm_get_num_msrs(struct kvm_vm *vm)
static int kvm_get_num_msrs_fd(int kvm_fd)
{
struct kvm_msr_list nmsrs;
int r;
nmsrs.nmsrs = 0;
r = ioctl(vm->kvm_fd, KVM_GET_MSR_INDEX_LIST, &nmsrs);
r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, &nmsrs);
TEST_ASSERT(r == -1 && errno == E2BIG, "Unexpected result from KVM_GET_MSR_INDEX_LIST probe, r: %i",
r);
return nmsrs.nmsrs;
}
static int kvm_get_num_msrs(struct kvm_vm *vm)
{
return kvm_get_num_msrs_fd(vm->kvm_fd);
}
struct kvm_msr_list *kvm_get_msr_index_list(void)
{
struct kvm_msr_list *list;
int nmsrs, r, kvm_fd;
kvm_fd = open(KVM_DEV_PATH, O_RDONLY);
if (kvm_fd < 0)
exit(KSFT_SKIP);
nmsrs = kvm_get_num_msrs_fd(kvm_fd);
list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
list->nmsrs = nmsrs;
r = ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
close(kvm_fd);
TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_MSR_INDEX_LIST, r: %i",
r);
return list;
}
struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid)
{
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
@ -1158,7 +1207,12 @@ bool is_intel_cpu(void)
return (ebx == chunk[0] && edx == chunk[1] && ecx == chunk[2]);
}
uint32_t kvm_get_cpuid_max(void)
uint32_t kvm_get_cpuid_max_basic(void)
{
return kvm_get_supported_cpuid_entry(0)->eax;
}
uint32_t kvm_get_cpuid_max_extended(void)
{
return kvm_get_supported_cpuid_entry(0x80000000)->eax;
}
@ -1169,7 +1223,7 @@ void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits)
bool pae;
/* SDM 4.1.4 */
if (kvm_get_cpuid_max() < 0x80000008) {
if (kvm_get_cpuid_max_extended() < 0x80000008) {
pae = kvm_get_supported_cpuid_entry(1)->edx & (1 << 6);
*pa_bits = pae ? 36 : 32;
*va_bits = 32;

76
tools/testing/selftests/kvm/x86_64/xss_msr_test.c Normal file
View File

@ -0,0 +1,76 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019, Google LLC.
*
* Tests for the IA32_XSS MSR.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <sys/ioctl.h>
#include "test_util.h"
#include "kvm_util.h"
#include "vmx.h"
#define VCPU_ID 1
#define MSR_BITS 64
#define X86_FEATURE_XSAVES (1<<3)
bool is_supported_msr(u32 msr_index)
{
struct kvm_msr_list *list;
bool found = false;
int i;
list = kvm_get_msr_index_list();
for (i = 0; i < list->nmsrs; ++i) {
if (list->indices[i] == msr_index) {
found = true;
break;
}
}
free(list);
return found;
}
int main(int argc, char *argv[])
{
struct kvm_cpuid_entry2 *entry;
bool xss_supported = false;
struct kvm_vm *vm;
uint64_t xss_val;
int i, r;
/* Create VM */
vm = vm_create_default(VCPU_ID, 0, 0);
if (kvm_get_cpuid_max_basic() >= 0xd) {
entry = kvm_get_supported_cpuid_index(0xd, 1);
xss_supported = entry && !!(entry->eax & X86_FEATURE_XSAVES);
}
if (!xss_supported) {
printf("IA32_XSS is not supported by the vCPU.\n");
exit(KSFT_SKIP);
}
xss_val = vcpu_get_msr(vm, VCPU_ID, MSR_IA32_XSS);
TEST_ASSERT(xss_val == 0,
"MSR_IA32_XSS should be initialized to zero\n");
vcpu_set_msr(vm, VCPU_ID, MSR_IA32_XSS, xss_val);
/*
* At present, KVM only supports a guest IA32_XSS value of 0. Verify
* that trying to set the guest IA32_XSS to an unsupported value fails.
* Also, in the future when a non-zero value succeeds check that
* IA32_XSS is in the KVM_GET_MSR_INDEX_LIST.
*/
for (i = 0; i < MSR_BITS; ++i) {
r = _vcpu_set_msr(vm, VCPU_ID, MSR_IA32_XSS, 1ull << i);
TEST_ASSERT(r == 0 || is_supported_msr(MSR_IA32_XSS),
"IA32_XSS was able to be set, but was not found in KVM_GET_MSR_INDEX_LIST.\n");
}
kvm_vm_free(vm);
}