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// SPDX-License-Identifier: GPL-2.0
/*
* Test for x86 KVM_CAP_HYPERV_CPUID
*
* Copyright (C) 2018, Red Hat, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2.
*
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "vmx.h"
#define VCPU_ID 0
static void guest_code(void)
{
}
static bool smt_possible(void)
{
char buf[16];
FILE *f;
bool res = true;
f = fopen("/sys/devices/system/cpu/smt/control", "r");
if (f) {
if (fread(buf, sizeof(*buf), sizeof(buf), f) > 0) {
if (!strncmp(buf, "forceoff", 8) ||
!strncmp(buf, "notsupported", 12))
res = false;
}
fclose(f);
}
return res;
}
static void test_hv_cpuid(struct kvm_cpuid2 *hv_cpuid_entries,
bool evmcs_enabled)
{
int i;
int nent = 9;
u32 test_val;
if (evmcs_enabled)
nent += 1; /* 0x4000000A */
TEST_ASSERT(hv_cpuid_entries->nent == nent,
"KVM_GET_SUPPORTED_HV_CPUID should return %d entries"
" with evmcs=%d (returned %d)",
nent, evmcs_enabled, hv_cpuid_entries->nent);
for (i = 0; i < hv_cpuid_entries->nent; i++) {
struct kvm_cpuid_entry2 *entry = &hv_cpuid_entries->entries[i];
TEST_ASSERT((entry->function >= 0x40000000) &&
(entry->function <= 0x40000082),
"function %x is our of supported range",
entry->function);
TEST_ASSERT(evmcs_enabled || (entry->function != 0x4000000A),
"0x4000000A leaf should not be reported");
TEST_ASSERT(entry->index == 0,
".index field should be zero");
TEST_ASSERT(entry->flags == 0,
".flags field should be zero");
TEST_ASSERT(!entry->padding[0] && !entry->padding[1] &&
!entry->padding[2], "padding should be zero");
switch (entry->function) {
case 0x40000000:
test_val = 0x40000082;
TEST_ASSERT(entry->eax == test_val,
"Wrong max leaf report in 0x40000000.EAX: %x"
" (evmcs=%d)",
entry->eax, evmcs_enabled
);
break;
case 0x40000004:
test_val = entry->eax & (1UL << 18);
TEST_ASSERT(!!test_val == !smt_possible(),
"NoNonArchitecturalCoreSharing bit"
" doesn't reflect SMT setting");
break;
}
/*
* If needed for debug:
* fprintf(stdout,
* "CPUID%lx EAX=0x%lx EBX=0x%lx ECX=0x%lx EDX=0x%lx\n",
* entry->function, entry->eax, entry->ebx, entry->ecx,
* entry->edx);
*/
}
}
void test_hv_cpuid_e2big(struct kvm_vm *vm)
{
static struct kvm_cpuid2 cpuid = {.nent = 0};
int ret;
ret = _vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, &cpuid);
TEST_ASSERT(ret == -1 && errno == E2BIG,
"KVM_GET_SUPPORTED_HV_CPUID didn't fail with -E2BIG when"
" it should have: %d %d", ret, errno);
}
struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(struct kvm_vm *vm)
{
int nent = 20; /* should be enough */
static struct kvm_cpuid2 *cpuid;
cpuid = malloc(sizeof(*cpuid) + nent * sizeof(struct kvm_cpuid_entry2));
if (!cpuid) {
perror("malloc");
abort();
}
cpuid->nent = nent;
vcpu_ioctl(vm, VCPU_ID, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
return cpuid;
}
int main(int argc, char *argv[])
{
struct kvm_vm *vm;
int rv, stage;
struct kvm_cpuid2 *hv_cpuid_entries;
bool evmcs_enabled;
/* Tell stdout not to buffer its content */
setbuf(stdout, NULL);
rv = kvm_check_cap(KVM_CAP_HYPERV_CPUID);
if (!rv) {
print_skip("KVM_CAP_HYPERV_CPUID not supported");
exit(KSFT_SKIP);
}
for (stage = 0; stage < 3; stage++) {
evmcs_enabled = false;
vm = vm_create_default(VCPU_ID, 0, guest_code);
switch (stage) {
case 0:
test_hv_cpuid_e2big(vm);
continue;
case 1:
break;
case 2:
if (!kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
print_skip("Enlightened VMCS is unsupported");
continue;
}
vcpu_enable_evmcs(vm, VCPU_ID);
evmcs_enabled = true;
break;
}
hv_cpuid_entries = kvm_get_supported_hv_cpuid(vm);
test_hv_cpuid(hv_cpuid_entries, evmcs_enabled);
free(hv_cpuid_entries);
kvm_vm_free(vm);
}
return 0;
}
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