mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-03-21 01:15:47 -04:00
Code Issues Packages Projects Releases Wiki Activity

KVM: selftests: Move 0/initial value PERF_CAPS checks to dedicated sub-test

Browse Source 
Use a separate sub-test to verify userspace can clear PERF_CAPABILITIES
and restore it to the KVM-supported value, as the testcase isn't unique
to the LBR format.

Link: https://lore.kernel.org/r/20230311004618.920745-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2023-03-10 16:46:06 -08:00
parent 957d0f70e9
commit 710fb61267
1 changed files with 19 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
View File

@@ -41,6 +41,24 @@ static void guest_code(void)
wrmsr(MSR_IA32_PERF_CAPABILITIES, PMU_CAP_LBR_FMT);
}
/*
* Verify KVM allows writing PERF_CAPABILITIES with all KVM-supported features
* enabled, as well as '0' (to disable all features).
*/
static void test_basic_perf_capabilities(union perf_capabilities host_cap)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, NULL);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, 0);
ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), 0);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), host_cap.capabilities);
kvm_vm_free(vm);
}
static void test_fungible_perf_capabilities(union perf_capabilities host_cap)
{
struct kvm_vcpu *vcpu;
@@ -66,12 +84,6 @@ static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
uint64_t val;
int ret;
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, 0);
ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), 0);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.lbr_format);
ASSERT_EQ(vcpu_get_msr(vcpu, MSR_IA32_PERF_CAPABILITIES), (u64)host_cap.lbr_format);
/*
* KVM only supports the host's native LBR format, as well as '0' (to
* disable LBR support). Verify KVM rejects all other LBR formats.
@@ -98,6 +110,7 @@ int main(int argc, char *argv[])
host_cap.capabilities = kvm_get_feature_msr(MSR_IA32_PERF_CAPABILITIES);
host_cap.capabilities &= (PMU_CAP_FW_WRITES | PMU_CAP_LBR_FMT);
test_basic_perf_capabilities(host_cap);
test_fungible_perf_capabilities(host_cap);
test_immutable_perf_capabilities(host_cap);