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KVM: selftests: Refactor LBR_FMT test to avoid use of separate macro 

Rework the LBR format test to use the bitfield instead of a separate
mask macro, mainly so that adding a nearly-identical PEBS format test
doesn't have to copy-paste-tweak the macro too.

No functional change intended.

Link: https://lore.kernel.org/r/20230311004618.920745-20-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-03-10 16:46:16 -08:00
parent bc7bb00829
commit 8ac2f774b9
1 changed files with 6 additions and 7 deletions
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13
tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
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@ -19,8 +19,6 @@
#include "kvm_util.h"
#include "vmx.h"
#define PMU_CAP_LBR_FMT 0x3f
union perf_capabilities {
struct {
u64 lbr_format:6;
@ -169,7 +167,7 @@ static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, NULL);
uint64_t val;
union perf_capabilities val = host_cap;
int r, bit;
for_each_set_bit(bit, &reserved_caps, 64) {
@ -184,12 +182,13 @@ static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
* KVM only supports the host's native LBR format, as well as '0' (to
* disable LBR support). Verify KVM rejects all other LBR formats.
*/
for (val = 1; val <= PMU_CAP_LBR_FMT; val++) {
if (val == (host_cap.capabilities & PMU_CAP_LBR_FMT))
for (val.lbr_format = 1; val.lbr_format; val.lbr_format++) {
if (val.lbr_format == host_cap.lbr_format)
continue;
r = _vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, val);
TEST_ASSERT(!r, "Bad LBR FMT = 0x%lx didn't fail", val);
r = _vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, val.capabilities);
TEST_ASSERT(!r, "Bad LBR FMT = 0x%x didn't fail, host = 0x%x",
val.lbr_format, host_cap.lbr_format);
}
kvm_vm_free(vm);