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