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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021, Red Hat Inc.
*
* Generic tests for KVM CPUID set/get ioctls
*/
#include <asm/kvm_para.h>
#include <linux/kvm_para.h>
#include <stdint.h>
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
struct cpuid_mask {
union {
struct {
u32 eax;
u32 ebx;
u32 ecx;
u32 edx;
};
u32 regs[4];
};
};
static void test_guest_cpuids(struct kvm_cpuid2 *guest_cpuid)
{
int i;
u32 eax, ebx, ecx, edx;
for (i = 0; i < guest_cpuid->nent; i++) {
__cpuid(guest_cpuid->entries[i].function,
guest_cpuid->entries[i].index,
&eax, &ebx, &ecx, &edx);
GUEST_ASSERT_EQ(eax, guest_cpuid->entries[i].eax);
GUEST_ASSERT_EQ(ebx, guest_cpuid->entries[i].ebx);
GUEST_ASSERT_EQ(ecx, guest_cpuid->entries[i].ecx);
GUEST_ASSERT_EQ(edx, guest_cpuid->entries[i].edx);
}
}
static void guest_main(struct kvm_cpuid2 *guest_cpuid)
{
GUEST_SYNC(1);
test_guest_cpuids(guest_cpuid);
GUEST_SYNC(2);
GUEST_ASSERT_EQ(this_cpu_property(X86_PROPERTY_MAX_KVM_LEAF), 0x40000001);
GUEST_DONE();
}
static struct cpuid_mask get_const_cpuid_mask(const struct kvm_cpuid_entry2 *entry)
{
struct cpuid_mask mask;
memset(&mask, 0xff, sizeof(mask));
switch (entry->function) {
case 0x1:
mask.regs[X86_FEATURE_OSXSAVE.reg] &= ~BIT(X86_FEATURE_OSXSAVE.bit);
break;
case 0x7:
mask.regs[X86_FEATURE_OSPKE.reg] &= ~BIT(X86_FEATURE_OSPKE.bit);
break;
case 0xd:
/*
* CPUID.0xD.{0,1}.EBX enumerate XSAVE size based on the current
* XCR0 and IA32_XSS MSR values.
*/
if (entry->index < 2)
mask.ebx = 0;
break;
}
return mask;
}
static void compare_cpuids(const struct kvm_cpuid2 *cpuid1,
const struct kvm_cpuid2 *cpuid2)
{
const struct kvm_cpuid_entry2 *e1, *e2;
int i;
TEST_ASSERT(cpuid1->nent == cpuid2->nent,
"CPUID nent mismatch: %d vs. %d", cpuid1->nent, cpuid2->nent);
for (i = 0; i < cpuid1->nent; i++) {
struct cpuid_mask mask;
e1 = &cpuid1->entries[i];
e2 = &cpuid2->entries[i];
TEST_ASSERT(e1->function == e2->function &&
e1->index == e2->index && e1->flags == e2->flags,
"CPUID entries[%d] mismtach: 0x%x.%d.%x vs. 0x%x.%d.%x",
i, e1->function, e1->index, e1->flags,
e2->function, e2->index, e2->flags);
/* Mask off dynamic bits, e.g. OSXSAVE, when comparing entries. */
mask = get_const_cpuid_mask(e1);
TEST_ASSERT((e1->eax & mask.eax) == (e2->eax & mask.eax) &&
(e1->ebx & mask.ebx) == (e2->ebx & mask.ebx) &&
(e1->ecx & mask.ecx) == (e2->ecx & mask.ecx) &&
(e1->edx & mask.edx) == (e2->edx & mask.edx),
"CPUID 0x%x.%x differ: 0x%x:0x%x:0x%x:0x%x vs 0x%x:0x%x:0x%x:0x%x",
e1->function, e1->index,
e1->eax & mask.eax, e1->ebx & mask.ebx,
e1->ecx & mask.ecx, e1->edx & mask.edx,
e2->eax & mask.eax, e2->ebx & mask.ebx,
e2->ecx & mask.ecx, e2->edx & mask.edx);
}
}
static void run_vcpu(struct kvm_vcpu *vcpu, int stage)
{
struct ucall uc;
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
case UCALL_SYNC:
TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
uc.args[1] == stage + 1,
"Stage %d: Unexpected register values vmexit, got %lx",
stage + 1, (ulong)uc.args[1]);
return;
case UCALL_DONE:
return;
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
default:
TEST_ASSERT(false, "Unexpected exit: %s",
exit_reason_str(vcpu->run->exit_reason));
}
}
struct kvm_cpuid2 *vcpu_alloc_cpuid(struct kvm_vm *vm, vm_vaddr_t *p_gva, struct kvm_cpuid2 *cpuid)
{
int size = sizeof(*cpuid) + cpuid->nent * sizeof(cpuid->entries[0]);
vm_vaddr_t gva = vm_vaddr_alloc(vm, size, KVM_UTIL_MIN_VADDR);
struct kvm_cpuid2 *guest_cpuids = addr_gva2hva(vm, gva);
memcpy(guest_cpuids, cpuid, size);
*p_gva = gva;
return guest_cpuids;
}
static void set_cpuid_after_run(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *ent;
int rc;
u32 eax, ebx, x;
/* Setting unmodified CPUID is allowed */
rc = __vcpu_set_cpuid(vcpu);
TEST_ASSERT(!rc, "Setting unmodified CPUID after KVM_RUN failed: %d", rc);
/* Changing CPU features is forbidden */
ent = vcpu_get_cpuid_entry(vcpu, 0x7);
ebx = ent->ebx;
ent->ebx--;
rc = __vcpu_set_cpuid(vcpu);
TEST_ASSERT(rc, "Changing CPU features should fail");
ent->ebx = ebx;
/* Changing MAXPHYADDR is forbidden */
ent = vcpu_get_cpuid_entry(vcpu, 0x80000008);
eax = ent->eax;
x = eax & 0xff;
ent->eax = (eax & ~0xffu) | (x - 1);
rc = __vcpu_set_cpuid(vcpu);
TEST_ASSERT(rc, "Changing MAXPHYADDR should fail");
ent->eax = eax;
}
static void test_get_cpuid2(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(vcpu->cpuid->nent + 1);
int i, r;
vcpu_ioctl(vcpu, KVM_GET_CPUID2, cpuid);
TEST_ASSERT(cpuid->nent == vcpu->cpuid->nent,
"KVM didn't update nent on success, wanted %u, got %u",
vcpu->cpuid->nent, cpuid->nent);
for (i = 0; i < vcpu->cpuid->nent; i++) {
cpuid->nent = i;
r = __vcpu_ioctl(vcpu, KVM_GET_CPUID2, cpuid);
TEST_ASSERT(r && errno == E2BIG, KVM_IOCTL_ERROR(KVM_GET_CPUID2, r));
TEST_ASSERT(cpuid->nent == i, "KVM modified nent on failure");
}
free(cpuid);
}
int main(void)
{
struct kvm_vcpu *vcpu;
vm_vaddr_t cpuid_gva;
struct kvm_vm *vm;
int stage;
vm = vm_create_with_one_vcpu(&vcpu, guest_main);
compare_cpuids(kvm_get_supported_cpuid(), vcpu->cpuid);
vcpu_alloc_cpuid(vm, &cpuid_gva, vcpu->cpuid);
vcpu_args_set(vcpu, 1, cpuid_gva);
for (stage = 0; stage < 3; stage++)
run_vcpu(vcpu, stage);
set_cpuid_after_run(vcpu);
test_get_cpuid2(vcpu);
kvm_vm_free(vm);
}
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