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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2023, Google LLC.
   4  */
   5 #include <sys/ioctl.h>
   6
   7 #include "test_util.h"
   8 #include "kvm_util.h"
   9 #include "vmx.h"
  10
  11 void test_hwcr_bit(struct kvm_vcpu *vcpu, unsigned int bit)
  12 {
  13         const uint64_t ignored = BIT_ULL(3) | BIT_ULL(6) | BIT_ULL(8);
  14         const uint64_t valid = BIT_ULL(18) | BIT_ULL(24);
  15         const uint64_t legal = ignored | valid;
  16         uint64_t val = BIT_ULL(bit);
  17         uint64_t actual;
  18         int r;
  19
  20         r = _vcpu_set_msr(vcpu, MSR_K7_HWCR, val);
  21         TEST_ASSERT(val & ~legal ? !r : r == 1,
  22                     "Expected KVM_SET_MSRS(MSR_K7_HWCR) = 0x%lx to %s",
  23                     val, val & ~legal ? "fail" : "succeed");
  24
  25         actual = vcpu_get_msr(vcpu, MSR_K7_HWCR);
  26         TEST_ASSERT(actual == (val & valid),
  27                     "Bit %u: unexpected HWCR 0x%lx; expected 0x%lx",
  28                     bit, actual, (val & valid));
  29
  30         vcpu_set_msr(vcpu, MSR_K7_HWCR, 0);
  31 }
  32
  33 int main(int argc, char *argv[])
  34 {
  35         struct kvm_vm *vm;
  36         struct kvm_vcpu *vcpu;
  37         unsigned int bit;
  38
  39         vm = vm_create_with_one_vcpu(&vcpu, NULL);
  40
  41         for (bit = 0; bit < BITS_PER_LONG; bit++)
  42                 test_hwcr_bit(vcpu, bit);
  43
  44         kvm_vm_free(vm);
  45 }