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([2601:282:8200:4c:4ef8:d404:554b:9671]) by smtp.gmail.com with ESMTPSA id l7sm9486227ilv.75.2022.01.25.11.48.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Jan 2022 11:48:02 -0800 (PST) Subject: Re: [PATCH] kselftest: kvm/arm64: Skip tests if we can't create a vgic-v3 To: Mark Brown , Marc Zyngier , Shuah Khan Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kselftest@vger.kernel.org, Shuah Khan References: <20220125192851.3907611-1-broonie@kernel.org> From: Shuah Khan Message-ID: Date: Tue, 25 Jan 2022 12:48:00 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20220125192851.3907611-1-broonie@kernel.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220125_114805_253220_D43EA89E X-CRM114-Status: GOOD ( 28.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/25/22 12:28 PM, Mark Brown wrote: > The arch_timer and vgic_irq kselftests assume that they can create a > vgic-v3, using the library function vgic_v3_setup() which aborts with a > test failure if it is not possible to do so. Since vgic-v3 can only be > instantiated on systems where the host has GICv3 this leads to false > positives on older systems where that is not the case. > > Fix this by changing vgic_v3_setup() to return an error if the vgic can't > be instantiated and have the callers skip if this happens. We could also > exit flagging a skip in vgic_v3_setup() but this would prevent future test > cases conditionally deciding which GIC to use or generally doing more > complex output. > > Signed-off-by: Mark Brown > --- > tools/testing/selftests/kvm/aarch64/arch_timer.c | 7 ++++++- > tools/testing/selftests/kvm/aarch64/vgic_irq.c | 5 +++++ > tools/testing/selftests/kvm/lib/aarch64/vgic.c | 4 +++- > 3 files changed, 14 insertions(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/kvm/aarch64/arch_timer.c b/tools/testing/selftests/kvm/aarch64/arch_timer.c > index 9ad38bd360a4..791d38404652 100644 > --- a/tools/testing/selftests/kvm/aarch64/arch_timer.c > +++ b/tools/testing/selftests/kvm/aarch64/arch_timer.c > @@ -366,6 +366,7 @@ static struct kvm_vm *test_vm_create(void) > { > struct kvm_vm *vm; > unsigned int i; > + int ret; > int nr_vcpus = test_args.nr_vcpus; > > vm = vm_create_default_with_vcpus(nr_vcpus, 0, 0, guest_code, NULL); > @@ -382,7 +383,11 @@ static struct kvm_vm *test_vm_create(void) > > ucall_init(vm, NULL); > test_init_timer_irq(vm); > - vgic_v3_setup(vm, nr_vcpus, 64, GICD_BASE_GPA, GICR_BASE_GPA); > + ret = vgic_v3_setup(vm, nr_vcpus, 64, GICD_BASE_GPA, GICR_BASE_GPA); > + if (ret < 0) { > + pr_info("Failed to create vgic-v3, skipping\n"); > + exit(KSFT_SKIP); > + } > > /* Make all the test's cmdline args visible to the guest */ > sync_global_to_guest(vm, test_args); > diff --git a/tools/testing/selftests/kvm/aarch64/vgic_irq.c b/tools/testing/selftests/kvm/aarch64/vgic_irq.c > index e6c7d7f8fbd1..8c6b61b8e6aa 100644 > --- a/tools/testing/selftests/kvm/aarch64/vgic_irq.c > +++ b/tools/testing/selftests/kvm/aarch64/vgic_irq.c > @@ -761,6 +761,11 @@ static void test_vgic(uint32_t nr_irqs, bool level_sensitive, bool eoi_split) > > gic_fd = vgic_v3_setup(vm, 1, nr_irqs, > GICD_BASE_GPA, GICR_BASE_GPA); > + if (gic_fd < 0) { > + pr_info("Failed to create vgic-v3, skipping\n"); > + exit(KSFT_SKIP); > + } > + > > vm_install_exception_handler(vm, VECTOR_IRQ_CURRENT, > guest_irq_handlers[args.eoi_split][args.level_sensitive]); > diff --git a/tools/testing/selftests/kvm/lib/aarch64/vgic.c b/tools/testing/selftests/kvm/lib/aarch64/vgic.c > index b3a0fca0d780..647c18733e1b 100644 > --- a/tools/testing/selftests/kvm/lib/aarch64/vgic.c > +++ b/tools/testing/selftests/kvm/lib/aarch64/vgic.c > @@ -52,7 +52,9 @@ int vgic_v3_setup(struct kvm_vm *vm, unsigned int nr_vcpus, uint32_t nr_irqs, > nr_vcpus, nr_vcpus_created); > > /* Distributor setup */ > - gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, false); > + gic_fd = kvm_create_device(vm, KVM_DEV_TYPE_ARM_VGIC_V3, true); Assume the flag change is intentional. The reason isn't obvious in the change log > + if (gic_fd == -1) > + return -1; > > kvm_device_access(gic_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, > 0, &nr_irqs, true); > Looks good to me otherwise - thanks for adding the skips Reviewed-by: Shuah Khan thanks, -- Shuah _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel