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 #include <fcntl.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <sys/ioctl.h>
  17
  18 #include "test_util.h"
  19 #include "kvm_util.h"
  20 #include "processor.h"
  21
  22 #define MSR_PLATFORM_INFO_MAX_TURBO_RATIO 0xff00
  23
  24 static void guest_code(void)
  25 {
  26         uint64_t msr_platform_info;
  27         uint8_t vector;
  28
  29         GUEST_SYNC(true);
  30         msr_platform_info = rdmsr(MSR_PLATFORM_INFO);
  31         GUEST_ASSERT_EQ(msr_platform_info & MSR_PLATFORM_INFO_MAX_TURBO_RATIO,
  32                         MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
  33
  34         GUEST_SYNC(false);
  35         vector = rdmsr_safe(MSR_PLATFORM_INFO, &msr_platform_info);
  36         GUEST_ASSERT_EQ(vector, GP_VECTOR);
  37
  38         GUEST_DONE();
  39 }
  40
  41 int main(int argc, char *argv[])
  42 {
  43         struct kvm_vcpu *vcpu;
  44         struct kvm_vm *vm;
  45         uint64_t msr_platform_info;
  46         struct ucall uc;
  47
  48         TEST_REQUIRE(kvm_has_cap(KVM_CAP_MSR_PLATFORM_INFO));
  49
  50         vm = vm_create_with_one_vcpu(&vcpu, guest_code);
  51
  52         msr_platform_info = vcpu_get_msr(vcpu, MSR_PLATFORM_INFO);
  53         vcpu_set_msr(vcpu, MSR_PLATFORM_INFO,
  54                      msr_platform_info | MSR_PLATFORM_INFO_MAX_TURBO_RATIO);
  55
  56         for (;;) {
  57                 vcpu_run(vcpu);
  58                 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
  59
  60                 switch (get_ucall(vcpu, &uc)) {
  61                 case UCALL_SYNC:
  62                         vm_enable_cap(vm, KVM_CAP_MSR_PLATFORM_INFO, uc.args[1]);
  63                         break;
  64                 case UCALL_DONE:
  65                         goto done;
  66                 case UCALL_ABORT:
  67                         REPORT_GUEST_ASSERT(uc);
  68                 default:
  69                         TEST_FAIL("Unexpected ucall %lu", uc.cmd);
  70                         break;
  71                 }
  72         }
  73
  74 done:
  75         kvm_vm_free(vm);
  76
  77         return 0;
  78 }