Test that userspace adjustment of the guest physical counter-timer results in the correct view within the guest.
Cc: Andrew Jones <[email protected]> Signed-off-by: Oliver Upton <[email protected]> --- .../selftests/kvm/include/aarch64/processor.h | 12 +++++++ .../kvm/system_counter_offset_test.c | 31 +++++++++++++++++-- 2 files changed, 40 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h index 3168cdbae6ee..7f53d90e9512 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -141,4 +141,16 @@ static inline uint64_t read_cntvct_ordered(void) return r; } +static inline uint64_t read_cntpct_ordered(void) +{ + uint64_t r; + + __asm__ __volatile__("isb\n\t" + "mrs %0, cntpct_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 ac933db83d03..82d26a45cc48 100644 --- a/tools/testing/selftests/kvm/system_counter_offset_test.c +++ b/tools/testing/selftests/kvm/system_counter_offset_test.c @@ -57,6 +57,9 @@ static uint64_t host_read_guest_system_counter(struct test_case *test) enum arch_counter { VIRTUAL, + PHYSICAL, + /* offset physical, read virtual */ + PHYSICAL_READ_VIRTUAL, }; struct test_case { @@ -68,32 +71,54 @@ static struct test_case test_cases[] = { { .counter = VIRTUAL, .offset = 0 }, { .counter = VIRTUAL, .offset = 180 * NSEC_PER_SEC }, { .counter = VIRTUAL, .offset = -180 * NSEC_PER_SEC }, + { .counter = PHYSICAL, .offset = 0 }, + { .counter = PHYSICAL, .offset = 180 * NSEC_PER_SEC }, + { .counter = PHYSICAL, .offset = -180 * NSEC_PER_SEC }, + { .counter = PHYSICAL_READ_VIRTUAL, .offset = 0 }, + { .counter = PHYSICAL_READ_VIRTUAL, .offset = 180 * NSEC_PER_SEC }, + { .counter = PHYSICAL_READ_VIRTUAL, .offset = -180 * NSEC_PER_SEC }, }; static void check_preconditions(struct kvm_vm *vm) { - if (vcpu_has_reg(vm, VCPU_ID, KVM_REG_ARM_TIMER_OFFSET)) + if (vcpu_has_reg(vm, VCPU_ID, KVM_REG_ARM_TIMER_OFFSET) && + !_vcpu_has_device_attr(vm, VCPU_ID, KVM_ARM_VCPU_TIMER_CTRL, + KVM_ARM_VCPU_TIMER_OFFSET)) return; - print_skip("KVM_REG_ARM_TIMER_OFFSET not supported; skipping test"); + print_skip("KVM_REG_ARM_TIMER_OFFSET|KVM_ARM_VCPU_TIMER_OFFSET not supported; skipping test"); exit(KSFT_SKIP); } static void setup_system_counter(struct kvm_vm *vm, struct test_case *test) { + uint64_t cntvoff, cntpoff; struct kvm_one_reg reg = { .id = KVM_REG_ARM_TIMER_OFFSET, - .addr = (__u64)&test->offset, + .addr = (__u64)&cntvoff, }; + if (test->counter == VIRTUAL) { + cntvoff = test->offset; + cntpoff = 0; + } else { + cntvoff = 0; + cntpoff = test->offset; + } + vcpu_set_reg(vm, VCPU_ID, ®); + vcpu_access_device_attr(vm, VCPU_ID, KVM_ARM_VCPU_TIMER_CTRL, + KVM_ARM_VCPU_TIMER_OFFSET, &cntpoff, true); } static uint64_t guest_read_system_counter(struct test_case *test) { switch (test->counter) { case VIRTUAL: + case PHYSICAL_READ_VIRTUAL: return read_cntvct_ordered(); + case PHYSICAL: + return read_cntpct_ordered(); default: GUEST_ASSERT(0); } -- 2.32.0.605.g8dce9f2422-goog _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
