[PATCH v8 6/9] selftests: KVM: Add support for aarch64 to system_counter_offset_test
From: Oliver Upton <hidden>
Date: 2021-09-16 18:33:17
Also in:
kvm, kvmarm
Subsystem:
kernel selftest framework, kernel virtual machine (kvm), the rest · Maintainers:
Shuah Khan, Paolo Bonzini, Linus Torvalds
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 <redacted> Signed-off-by: Oliver Upton <redacted> --- 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!
--
2.33.0.464.g1972c5931b-goog
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