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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=7QjavrqBsU/MBAzScH1BwocaUHGDPl4uPFd2XGsDMvE=; b=hBbYFcZKFllJ6D1GdW1j3244LcY7X71CpcegC3q2vnyaZ81YQLUh23TV2v1lbFDToY JgPa/eiO5LWKE7Z4EDtMscvj6u3zTLSJIwai2iBE5aZn1Rcxc1F6scsYW3eoymAwCioW vu8lAhLvEb7VBPCv0PS/tipZzEbXcEbnwPVcGawqVnosNgX66oX10ji+Y8yvdfVZgDCz JdP1N11kXKKJeSju9bS5jTuEgxgfdOX4PD3UGSVNrQdMyYs5yf1I3WujrHGTamoMtOrl +mxyEs6ukEcBpY+8oZBCWNMc1fe31T/NZuMCGoIjhSA3ZDhSnFp0KdthTDwsBqfzQkGL MTKA== X-Gm-Message-State: AOAM531G8gm4YeCbTTVcgwf+nV4cTfETcfP6UkJhnzqPEIkzGTZOtcxC 6R/VxuNRHtTQfBOPyP4RDzx+hPrSDVs= X-Google-Smtp-Source: ABdhPJyEbuPS+wYh6ttOuY6erGnCSv4WLRJ1npvavUrNwz7P3JruTT8DOF+7Y2BrFtjDW2ZEfJYAF+ysuwg= X-Received: from oupton.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:404]) (user=oupton job=sendgmr) by 2002:a05:6214:7b4:: with SMTP id v20mr7057215qvz.0.1631816164628; Thu, 16 Sep 2021 11:16:04 -0700 (PDT) Date: Thu, 16 Sep 2021 18:15:52 +0000 In-Reply-To: <20210916181555.973085-1-oupton@google.com> Message-Id: <20210916181555.973085-7-oupton@google.com> Mime-Version: 1.0 References: <20210916181555.973085-1-oupton@google.com> X-Mailer: git-send-email 2.33.0.464.g1972c5931b-goog Subject: [PATCH v8 6/9] selftests: KVM: Add support for aarch64 to system_counter_offset_test From: Oliver Upton To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Will Deacon , Catalin Marinas , Oliver Upton X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210916_111606_373586_9F07A329 X-CRM114-Status: GOOD ( 15.96 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org KVM/arm64 now allows userspace to adjust the guest virtual counter-timer via a vCPU register. Test that changes to the virtual counter-timer offset result in the correct view being presented to the guest. Reviewed-by: Andrew Jones Signed-off-by: Oliver Upton --- tools/testing/selftests/kvm/Makefile | 1 + .../selftests/kvm/include/aarch64/processor.h | 12 ++++ .../kvm/system_counter_offset_test.c | 64 ++++++++++++++++++- 3 files changed, 76 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 225803ac95bb..fd61d0063c50 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -98,6 +98,7 @@ 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 c0273aefa63d..4c7472823df3 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -132,4 +132,16 @@ 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 b337bbbfa41f..7ea406fdd56f 100644 --- a/tools/testing/selftests/kvm/system_counter_offset_test.c +++ b/tools/testing/selftests/kvm/system_counter_offset_test.c @@ -53,7 +53,69 @@ 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) +{ + struct kvm_enable_cap cap = { + .cap = KVM_CAP_ARM_VTIMER_OFFSET, + }; + + if (vcpu_has_reg(vm, VCPU_ID, KVM_REG_ARM_TIMER_OFFSET)) + return; + + if (!kvm_check_cap(KVM_CAP_ARM_VTIMER_OFFSET)) { + print_skip("KVM_REG_ARM_TIMER_OFFSET not supported"); + exit(KSFT_SKIP); + } + + vm_enable_cap(vm, &cap); +} + +static void setup_system_counter(struct kvm_vm *vm, struct test_case *test) +{ + struct kvm_one_reg reg = { + .id = KVM_REG_ARM_TIMER_OFFSET, + .addr = (__u64)&test->offset, + }; + + vcpu_set_reg(vm, VCPU_ID, ®); +} + +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!