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// SPDX-License-Identifier: GPL-2.0
/*
* Test for x86 KVM_CAP_MSR_PLATFORM_INFO
*
* Copyright (C) 2018, Google LLC.
*
* This work is licensed under the terms of the GNU GPL, version 2.
*
* Verifies expected behavior of controlling guest access to
* MSR_PLATFORM_INFO.
*/
#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 "x86.h"
#define VCPU_ID 0
#define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
static void guest_code(void)
{
uint64_t msr_platform_info;
for (;;) {
msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
GUEST_SYNC(msr_platform_info);
asm volatile ("inc %r11");
}
}
static void set_msr_platform_info_enabled(struct kvm_vm *vm, bool enable)
{
struct kvm_enable_cap cap = {};
cap.cap = KVM_CAP_MSR_PLATFORM_INFO;
cap.flags = 0;
cap.args[0] = (int)enable;
vm_enable_cap(vm, &cap);
}
static void test_msr_platform_info_enabled(struct kvm_vm *vm)
{
struct kvm_run *run = vcpu_state(vm, VCPU_ID);
struct guest_args args;
set_msr_platform_info_enabled(vm, true);
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Exit_reason other than KVM_EXIT_IO: %u (%s),\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
guest_args_read(vm, VCPU_ID, &args);
TEST_ASSERT(args.port == GUEST_PORT_SYNC,
"Received IO from port other than PORT_HOST_SYNC: %u\n",
run->io.port);
TEST_ASSERT((args.arg1 & MSR_PLATFORM_INFO_MAX_TURBO_RATIO) ==
MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
"Expected MSR_PLATFORM_INFO to have max turbo ratio mask: %i.",
MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
}
static void test_msr_platform_info_disabled(struct kvm_vm *vm)
{
struct kvm_run *run = vcpu_state(vm, VCPU_ID);
set_msr_platform_info_enabled(vm, false);
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
"Exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
}
int main(int argc, char *argv[])
{
struct kvm_vm *vm;
struct kvm_run *state;
int rv;
uint64_t msr_platform_info;
/* Tell stdout not to buffer its content */
setbuf(stdout, NULL);
rv = kvm_check_cap(KVM_CAP_MSR_PLATFORM_INFO);
if (!rv) {
fprintf(stderr,
"KVM_CAP_MSR_PLATFORM_INFO not supported, skip test\n");
exit(KSFT_SKIP);
}
vm = vm_create_default(VCPU_ID, 0, guest_code);
msr_platform_info = vcpu_get_msr(vm, VCPU_ID, MSR_PLATFORM_INFO);
vcpu_set_msr(vm, VCPU_ID, MSR_PLATFORM_INFO,
msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
test_msr_platform_info_enabled(vm);
test_msr_platform_info_disabled(vm);
vcpu_set_msr(vm, VCPU_ID, MSR_PLATFORM_INFO, msr_platform_info);
kvm_vm_free(vm);
return 0;
}
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