linux-kernel - Re: [PATCH v9 3/3] KVM: selftests: aarch64: Add invalid filter test in pmu_event_filter

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Date: Tue, 18 Jun 2024 15:23:43 +0800
From: Shaoqin Huang <shahuang@...hat.com>
To: Raghavendra Rao Ananta <rananta@...gle.com>
Cc: Oliver Upton <oliver.upton@...ux.dev>, Marc Zyngier <maz@...nel.org>,
 kvmarm@...ts.linux.dev, Eric Auger <eric.auger@...hat.com>,
 James Morse <james.morse@....com>, Suzuki K Poulose
 <suzuki.poulose@....com>, Zenghui Yu <yuzenghui@...wei.com>,
 Paolo Bonzini <pbonzini@...hat.com>, Shuah Khan <shuah@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 3/3] KVM: selftests: aarch64: Add invalid filter test
 in pmu_event_filter_test



On 6/18/24 08:01, Raghavendra Rao Ananta wrote:
> Hi Shaoqin,
> 
> On Thu, Jun 13, 2024 at 1:27 AM Shaoqin Huang <shahuang@...hat.com> wrote:
>>
>> Add the invalid filter test which sets the filter beyond the event
>> space and sets the invalid action to double check if the
>> KVM_ARM_VCPU_PMU_V3_FILTER will return the expected error.
>>
>> Reviewed-by: Eric Auger <eric.auger@...hat.com>
>> Signed-off-by: Shaoqin Huang <shahuang@...hat.com>
>> ---
>>   .../kvm/aarch64/pmu_event_filter_test.c       | 37 +++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>
>> diff --git a/tools/testing/selftests/kvm/aarch64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/aarch64/pmu_event_filter_test.c
>> index fb0fde1ed436..13b2f354c39b 100644
>> --- a/tools/testing/selftests/kvm/aarch64/pmu_event_filter_test.c
>> +++ b/tools/testing/selftests/kvm/aarch64/pmu_event_filter_test.c
>> @@ -8,6 +8,7 @@
>>    * This test checks if the guest only see the limited pmu event that userspace
>>    * sets, if the guest can use those events which user allow, and if the guest
>>    * can't use those events which user deny.
>> + * It also checks that setting invalid filter ranges return the expected error.
>>    * This test runs only when KVM_CAP_ARM_PMU_V3, KVM_ARM_VCPU_PMU_V3_FILTER
>>    * is supported on the host.
>>    */
>> @@ -178,6 +179,40 @@ static void destroy_vpmu_vm(void)
>>          kvm_vm_free(vpmu_vm.vm);
>>   }
>>
>> +static void test_invalid_filter(void)
>> +{
>> +       struct kvm_pmu_event_filter invalid;
>> +       int ret;
>> +
>> +       pr_info("Test: test_invalid_filter\n");
>> +
>> +       memset(&vpmu_vm, 0, sizeof(vpmu_vm));
>> +
>> +       vpmu_vm.vm = vm_create(1);
>> +       vpmu_vm.vcpu = vm_vcpu_add_with_vpmu(vpmu_vm.vm, 0, guest_code);
>> +       vpmu_vm.gic_fd = vgic_v3_setup(vpmu_vm.vm, 1, 64);
>> +       __TEST_REQUIRE(vpmu_vm.gic_fd >= 0,
>> +                      "Failed to create vgic-v3, skipping");
>> +
>> +       /* The max event number is (1 << 16), set a range largeer than it. */
> nit: s/largeer/larger
> 
> Also, perhaps not in this series, but we can also check for -EBUSY
> situations such as setting a (valid) filter after
> KVM_ARM_VCPU_PMU_V3_INIT and after the vCPUs have started.
> 

That's also a great test, we can add it in the future.

> Besides that, Reviewed-by: Raghavendra Rao Ananta <rananta@...gle.com>

Thanks a lot for your reviewing.

> 
> - Raghavendra
> 
> 
> 
>> +       invalid = __DEFINE_FILTER(BIT(15), BIT(15) + 1, 0);
>> +       ret = __kvm_device_attr_set(vpmu_vm.vcpu->fd, KVM_ARM_VCPU_PMU_V3_CTRL,
>> +                                   KVM_ARM_VCPU_PMU_V3_FILTER, &invalid);
>> +       TEST_ASSERT(ret && errno == EINVAL, "Set Invalid filter range "
>> +                   "ret = %d, errno = %d (expected ret = -1, errno = EINVAL)",
>> +                   ret, errno);
>> +
>> +       /* Set the Invalid action. */
>> +       invalid = __DEFINE_FILTER(0, 1, 3);
>> +       ret = __kvm_device_attr_set(vpmu_vm.vcpu->fd, KVM_ARM_VCPU_PMU_V3_CTRL,
>> +                                   KVM_ARM_VCPU_PMU_V3_FILTER, &invalid);
>> +       TEST_ASSERT(ret && errno == EINVAL, "Set Invalid filter action "
>> +                   "ret = %d, errno = %d (expected ret = -1, errno = EINVAL)",
>> +                   ret, errno);
>> +
>> +       destroy_vpmu_vm();
>> +}
>> +
>>   static void run_test(struct test_desc *t)
>>   {
>>          pr_info("Test: %s\n", t->name);
>> @@ -300,4 +335,6 @@ int main(void)
>>          TEST_REQUIRE(kvm_pmu_support_events());
>>
>>          run_tests();
>> +
>> +       test_invalid_filter();
>>   }
>> --
>> 2.40.1
>>
>>
> 

-- 
Shaoqin