tools/testing/selftests/kvm/x86_64/platform_info_test.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Test for x86 KVM_CAP_MSR_PLATFORM_INFO
   4  *
   5  * Copyright (C) 2018, Google LLC.
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2.
   8  *
   9  * Verifies expected behavior of controlling guest access to
  10  * MSR_PLATFORM_INFO.
  11  */
  12
  13 #define _GNU_SOURCE /* for program_invocation_short_name */
  14 #include <fcntl.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/ioctl.h>
  19
  20 #include "test_util.h"
  21 #include "kvm_util.h"
  22 #include "processor.h"
  23
  24 #define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
  25
  26 static void guest_code(void)
  27 {
  28         uint64_t msr_platform_info;
  29
  30         for (;;) {
  31                 msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
  32                 GUEST_SYNC(msr_platform_info);
  33                 asm volatile ("inc %r11");
  34         }
  35 }
  36
  37 static void test_msr_platform_info_enabled(struct kvm_vcpu *vcpu)
  38 {
  39         struct ucall uc;
  40
  41         vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, true);
  42         vcpu_run(vcpu);
  43         TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
  44
  45         get_ucall(vcpu, &uc);
  46         TEST_ASSERT(uc.cmd == UCALL_SYNC,
  47                         "Received ucall other than UCALL_SYNC: %lu", uc.cmd);
  48         TEST_ASSERT((uc.args[1] & MSR_PLATFORM_INFO_MAX_TURBO_RATIO) ==
  49                 MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
  50                 "Expected MSR_PLATFORM_INFO to have max turbo ratio mask: %i.",
  51                 MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
  52 }
  53
  54 static void test_msr_platform_info_disabled(struct kvm_vcpu *vcpu)
  55 {
  56         vm_enable_cap(vcpu->vm, KVM_CAP_MSR_PLATFORM_INFO, false);
  57         vcpu_run(vcpu);
  58         TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_SHUTDOWN);
  59 }
  60
  61 int main(int argc, char *argv[])
  62 {
  63         struct kvm_vcpu *vcpu;
  64         struct kvm_vm *vm;
  65         uint64_t msr_platform_info;
  66
  67         TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO));
  68
  69         vm = vm_create_with_one_vcpu(&vcpu, guest_code);
  70
  71         msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO);
  72         vcpu_set_msr(vcpu, MSR_PLATFORM_INFO,
  73                      msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
  74         test_msr_platform_info_enabled(vcpu);
  75         test_msr_platform_info_disabled(vcpu);
  76         vcpu_set_msr(vcpu, MSR_PLATFORM_INFO, msr_platform_info);
  77
  78         kvm_vm_free(vm);
  79
  80         return 0;
  81 }