github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 16:44:58 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: selftests: x86: Use TAP interface in the vmx_pmu_caps test

Browse Source 
Use the kvm_test_harness.h interface in this test to get TAP
output, so that it is easier for the user to see what the test
is doing.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20240208204844.119326-8-thuth@redhat.com
[sean: make host_cap static]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Thomas Huth 2024-02-08 21:48:43 +01:00 committed by Sean Christopherson
parent a6983e8f5f
commit de1b03f25f
1 changed files with 12 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
tools/testing/selftests/kvm/x86_64/vmx_pmu_caps_test.c
View File

@ -15,10 +15,11 @@
#include <linux/bitmap.h>
#include "kvm_test_harness.h"
#include "kvm_util.h"
#include "vmx.h"
union perf_capabilities {
static union perf_capabilities {
struct {
u64 lbr_format:6;
u64 pebs_trap:1;
@ -32,7 +33,7 @@ union perf_capabilities {
u64 anythread_deprecated:1;
};
u64 capabilities;
};
} host_cap;
/*
* The LBR format and most PEBS features are immutable, all other features are
@ -73,19 +74,19 @@ static void guest_code(uint64_t current_val)
GUEST_DONE();
}
KVM_ONE_VCPU_TEST_SUITE(vmx_pmu_caps);
/*
* Verify that guest WRMSRs to PERF_CAPABILITIES #GP regardless of the value
* written, that the guest always sees the userspace controlled value, and that
* PERF_CAPABILITIES is immutable after KVM_RUN.
*/
static void test_guest_wrmsr_perf_capabilities(union perf_capabilities host_cap)
KVM_ONE_VCPU_TEST(vmx_pmu_caps, guest_wrmsr_perf_capabilities, guest_code)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, guest_code);
struct ucall uc;
int r, i;
vm_init_descriptor_tables(vm);
vm_init_descriptor_tables(vcpu->vm);
vcpu_init_descriptor_tables(vcpu);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
@ -117,31 +118,21 @@ static void test_guest_wrmsr_perf_capabilities(union perf_capabilities host_cap)
TEST_ASSERT(!r, "Post-KVM_RUN write '0x%llx'didn't fail",
host_cap.capabilities ^ BIT_ULL(i));
}
kvm_vm_free(vm);
}
/*
* 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)
KVM_ONE_VCPU_TEST(vmx_pmu_caps, basic_perf_capabilities, guest_code)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, NULL);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, 0);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
kvm_vm_free(vm);
}
static void test_fungible_perf_capabilities(union perf_capabilities host_cap)
KVM_ONE_VCPU_TEST(vmx_pmu_caps, fungible_perf_capabilities, guest_code)
{
const uint64_t fungible_caps = host_cap.capabilities & ~immutable_caps.capabilities;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, NULL);
int bit;
for_each_set_bit(bit, &fungible_caps, 64) {
@ -150,8 +141,6 @@ static void test_fungible_perf_capabilities(union perf_capabilities host_cap)
host_cap.capabilities & ~BIT_ULL(bit));
}
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
kvm_vm_free(vm);
}
/*
@ -160,14 +149,11 @@ static void test_fungible_perf_capabilities(union perf_capabilities host_cap)
* separately as they are multi-bit values, e.g. toggling or setting a single
* bit can generate a false positive without dedicated safeguards.
*/
static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
KVM_ONE_VCPU_TEST(vmx_pmu_caps, immutable_perf_capabilities, guest_code)
{
const uint64_t reserved_caps = (~host_cap.capabilities |
immutable_caps.capabilities) &
~format_caps.capabilities;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm = vm_create_with_one_vcpu(&vcpu, NULL);
union perf_capabilities val = host_cap;
int r, bit;
@ -201,8 +187,6 @@ static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
TEST_ASSERT(!r, "Bad PEBS FMT = 0x%x didn't fail, host = 0x%x",
val.pebs_format, host_cap.pebs_format);
}
kvm_vm_free(vm);
}
/*
@ -211,17 +195,13 @@ static void test_immutable_perf_capabilities(union perf_capabilities host_cap)
* LBR_TOS as those bits are writable across all uarch implementations (arch
* LBRs will need to poke a different MSR).
*/
static void test_lbr_perf_capabilities(union perf_capabilities host_cap)
KVM_ONE_VCPU_TEST(vmx_pmu_caps, lbr_perf_capabilities, guest_code)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
int r;
if (!host_cap.lbr_format)
return;
vm = vm_create_with_one_vcpu(&vcpu, NULL);
vcpu_set_msr(vcpu, MSR_IA32_PERF_CAPABILITIES, host_cap.capabilities);
vcpu_set_msr(vcpu, MSR_LBR_TOS, 7);
@ -229,14 +209,10 @@ static void test_lbr_perf_capabilities(union perf_capabilities host_cap)
r = _vcpu_set_msr(vcpu, MSR_LBR_TOS, 7);
TEST_ASSERT(!r, "Writing LBR_TOS should fail after disabling vPMU");
kvm_vm_free(vm);
}
int main(int argc, char *argv[])
{
union perf_capabilities host_cap;
TEST_REQUIRE(get_kvm_param_bool("enable_pmu"));
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_PDCM));
@ -248,9 +224,5 @@ int main(int argc, char *argv[])
TEST_ASSERT(host_cap.full_width_write,
"Full-width writes should always be supported");
test_basic_perf_capabilities(host_cap);
test_fungible_perf_capabilities(host_cap);
test_immutable_perf_capabilities(host_cap);
test_guest_wrmsr_perf_capabilities(host_cap);
test_lbr_perf_capabilities(host_cap);
return test_harness_run(argc, argv);
}