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Wed, 21 Jul 2021 09:26:48 -0700 (PDT) Received: from gator ([140.82.166.162]) by smtp.gmail.com with ESMTPSA id m1sm14838987iok.33.2021.07.21.09.26.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 09:26:48 -0700 (PDT) Date: Wed, 21 Jul 2021 18:26:45 +0200 From: Andrew Jones To: Oliver Upton Subject: Re: [PATCH v3 09/12] selftests: KVM: Add support for aarch64 to system_counter_offset_test Message-ID: <20210721162645.5frobtrhtniyanng@gator> References: <20210719184949.1385910-1-oupton@google.com> <20210719184949.1385910-10-oupton@google.com> MIME-Version: 1.0 In-Reply-To: <20210719184949.1385910-10-oupton@google.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=drjones@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: kvm@vger.kernel.org, Marc Zyngier , Raghavendra Rao Anata , Peter Shier , Sean Christopherson , David Matlack , Paolo Bonzini , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Jim Mattson X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Mon, Jul 19, 2021 at 06:49:46PM +0000, Oliver Upton wrote: > KVM/arm64 now allows userspace to adjust the guest virtual counter-timer > via a vCPU device attribute. Test that changes to the virtual > counter-timer offset result in the correct view being presented to the > guest. > > Signed-off-by: Oliver Upton > --- > tools/testing/selftests/kvm/Makefile | 1 + > .../selftests/kvm/include/aarch64/processor.h | 12 +++++ > .../kvm/system_counter_offset_test.c | 54 ++++++++++++++++++- > 3 files changed, 66 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile > index 7bf2e5fb1d5a..d89908108c97 100644 > --- a/tools/testing/selftests/kvm/Makefile > +++ b/tools/testing/selftests/kvm/Makefile > @@ -96,6 +96,7 @@ TEST_GEN_PROGS_aarch64 += kvm_page_table_test > TEST_GEN_PROGS_aarch64 += set_memory_region_test > TEST_GEN_PROGS_aarch64 += steal_time > TEST_GEN_PROGS_aarch64 += kvm_binary_stats_test > +TEST_GEN_PROGS_aarch64 += system_counter_offset_test > > TEST_GEN_PROGS_s390x = s390x/memop > TEST_GEN_PROGS_s390x += s390x/resets > diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h > index 27dc5c2e56b9..3168cdbae6ee 100644 > --- a/tools/testing/selftests/kvm/include/aarch64/processor.h > +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h > @@ -129,4 +129,16 @@ void vm_install_sync_handler(struct kvm_vm *vm, > > #define isb() asm volatile("isb" : : : "memory") > > +static inline uint64_t read_cntvct_ordered(void) > +{ > + uint64_t r; > + > + __asm__ __volatile__("isb\n\t" > + "mrs %0, cntvct_el0\n\t" > + "isb\n\t" > + : "=r"(r)); > + > + return r; > +} > + > #endif /* SELFTEST_KVM_PROCESSOR_H */ > diff --git a/tools/testing/selftests/kvm/system_counter_offset_test.c b/tools/testing/selftests/kvm/system_counter_offset_test.c > index 7e9015770759..88ad997f5b69 100644 > --- a/tools/testing/selftests/kvm/system_counter_offset_test.c > +++ b/tools/testing/selftests/kvm/system_counter_offset_test.c > @@ -53,7 +53,59 @@ static uint64_t host_read_guest_system_counter(struct test_case *test) > return rdtsc() + test->tsc_offset; > } > > -#else /* __x86_64__ */ > +#elif __aarch64__ /* __x86_64__ */ > + > +enum arch_counter { > + VIRTUAL, > +}; > + > +struct test_case { > + enum arch_counter counter; > + uint64_t offset; > +}; > + > +static struct test_case test_cases[] = { > + { .counter = VIRTUAL, .offset = 0 }, > + { .counter = VIRTUAL, .offset = 180 * NSEC_PER_SEC }, > + { .counter = VIRTUAL, .offset = -180 * NSEC_PER_SEC }, > +}; > + > +static void check_preconditions(struct kvm_vm *vm) > +{ > + if (!_vcpu_has_device_attr(vm, VCPU_ID, KVM_ARM_VCPU_TIMER_CTRL, > + KVM_ARM_VCPU_TIMER_OFFSET_VTIMER)) > + return; > + > + print_skip("KVM_ARM_VCPU_TIMER_OFFSET_VTIMER not supported; skipping test"); > + exit(KSFT_SKIP); > +} > + > +static void setup_system_counter(struct kvm_vm *vm, struct test_case *test) > +{ > + vcpu_access_device_attr(vm, VCPU_ID, KVM_ARM_VCPU_TIMER_CTRL, > + KVM_ARM_VCPU_TIMER_OFFSET_VTIMER, &test->offset, > + true); > +} > + > +static uint64_t guest_read_system_counter(struct test_case *test) > +{ > + switch (test->counter) { > + case VIRTUAL: > + return read_cntvct_ordered(); > + default: > + GUEST_ASSERT(0); > + } > + > + /* unreachable */ > + return 0; > +} > + > +static uint64_t host_read_guest_system_counter(struct test_case *test) > +{ > + return read_cntvct_ordered() - test->offset; > +} > + > +#else /* __aarch64__ */ > > #error test not implemented for this architecture! > > -- > 2.32.0.402.g57bb445576-goog > > _______________________________________________ > kvmarm mailing list > kvmarm@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > Reviewed-by: Andrew Jones _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm