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
11void 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
33int 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}