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KVM: selftests: Test behavior of HWCR, a.k.a. MSR_K7_HWCR

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Verify the following behavior holds true for writes and reads of HWCR from
host userspace:

* Attempts to set bits 3, 6, or 8 are ignored
* Bits 18 and 24 are the only bits that can be set
* Any bit that can be set can also be cleared

Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://lore.kernel.org/r/20230929230246.1954854-4-jmattson@google.com
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Jim Mattson 2023-09-29 16:02:46 -07:00 committed by Sean Christopherson
parent 8b0e00fba9
commit 591455325a
2 changed files with 48 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile
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@ -66,6 +66,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/dirty_log_page_splitting_test
TEST_GEN_PROGS_x86_64 += x86_64/get_msr_index_features
TEST_GEN_PROGS_x86_64 += x86_64/exit_on_emulation_failure_test
TEST_GEN_PROGS_x86_64 += x86_64/fix_hypercall_test
TEST_GEN_PROGS_x86_64 += x86_64/hwcr_msr_test
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_clock
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_evmcs

47
tools/testing/selftests/kvm/x86_64/hwcr_msr_test.c Normal file
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@ -0,0 +1,47 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023, Google LLC.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <sys/ioctl.h>
#include "test_util.h"
#include "kvm_util.h"
#include "vmx.h"
void test_hwcr_bit(struct kvm_vcpu *vcpu, unsigned int bit)
{
const uint64_t ignored = BIT_ULL(3) | BIT_ULL(6) | BIT_ULL(8);
const uint64_t valid = BIT_ULL(18) | BIT_ULL(24);
const uint64_t legal = ignored | valid;
uint64_t val = BIT_ULL(bit);
uint64_t actual;
int r;
r = _vcpu_set_msr(vcpu, MSR_K7_HWCR, val);
TEST_ASSERT(val & ~legal ? !r : r == 1,
"Expected KVM_SET_MSRS(MSR_K7_HWCR) = 0x%lx to %s",
val, val & ~legal ? "fail" : "succeed");
actual = vcpu_get_msr(vcpu, MSR_K7_HWCR);
TEST_ASSERT(actual == (val & valid),
"Bit %u: unexpected HWCR 0x%lx; expected 0x%lx",
bit, actual, (val & valid));
vcpu_set_msr(vcpu, MSR_K7_HWCR, 0);
}
int main(int argc, char *argv[])
{
struct kvm_vm *vm;
struct kvm_vcpu *vcpu;
unsigned int bit;
vm = vm_create_with_one_vcpu(&vcpu, NULL);
for (bit = 0; bit < BITS_PER_LONG; bit++)
test_hwcr_bit(vcpu, bit);
kvm_vm_free(vm);
}