Test userspace can use KVM_SET_VCPU_EVENTS to inject an external instruction abort into guest. The test injects instruction abort at an arbitrary time without real SEA happening in the guest VCPU, so only certain ESR_EL1 value can be expected, but not the case for FAR_EL1.
Signed-off-by: Jiaqi Yan jiaqiyan@google.com --- tools/arch/arm64/include/uapi/asm/kvm.h | 3 +- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/arm64/inject_iabt.c | 100 ++++++++++++++++++ 3 files changed, 103 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/kvm/arm64/inject_iabt.c
diff --git a/tools/arch/arm64/include/uapi/asm/kvm.h b/tools/arch/arm64/include/uapi/asm/kvm.h index af9d9acaf9975..d3a4530846311 100644 --- a/tools/arch/arm64/include/uapi/asm/kvm.h +++ b/tools/arch/arm64/include/uapi/asm/kvm.h @@ -184,8 +184,9 @@ struct kvm_vcpu_events { __u8 serror_pending; __u8 serror_has_esr; __u8 ext_dabt_pending; + __u8 ext_iabt_pending; /* Align it to 8 bytes */ - __u8 pad[5]; + __u8 pad[4]; __u64 serror_esr; } exception; __u32 reserved[12]; diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 16d2e9f32619f..708fd126a36dd 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -148,6 +148,7 @@ TEST_GEN_PROGS_arm64 += arm64/aarch32_id_regs TEST_GEN_PROGS_arm64 += arm64/arch_timer_edge_cases TEST_GEN_PROGS_arm64 += arm64/debug-exceptions TEST_GEN_PROGS_arm64 += arm64/hypercalls +TEST_GEN_PROGS_arm64 += arm64/inject_iabt TEST_GEN_PROGS_arm64 += arm64/mmio_abort TEST_GEN_PROGS_arm64 += arm64/page_fault_test TEST_GEN_PROGS_arm64 += arm64/psci_test diff --git a/tools/testing/selftests/kvm/arm64/inject_iabt.c b/tools/testing/selftests/kvm/arm64/inject_iabt.c new file mode 100644 index 0000000000000..43b701e9143c2 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/inject_iabt.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * inject_iabt.c - Tests for injecting instruction aborts into guest. + */ + +#include "processor.h" +#include "test_util.h" + +static void expect_iabt_handler(struct ex_regs *regs) +{ + u64 esr = read_sysreg(esr_el1); + + GUEST_PRINTF("Guest SEA esr_el1=%#lx\n", esr); + GUEST_ASSERT_EQ(ESR_ELx_EC(esr), ESR_ELx_EC_IABT_CUR); + GUEST_ASSERT_EQ(esr & ESR_ELx_FSC_TYPE, ESR_ELx_FSC_EXTABT); + /* + * We inject IABT but there is no SEA in guest at all, + * so guest should see FnV == 1, which is set by KVM. + */ + GUEST_ASSERT(esr & ESR_ELx_FnV); + + GUEST_DONE(); +} + +static void guest_code(void) +{ + GUEST_FAIL("Guest should only run SEA handler"); +} + +static void vcpu_run_expect_done(struct kvm_vcpu *vcpu) +{ + struct ucall uc; + bool guest_done = false; + + do { + vcpu_run(vcpu); + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + break; + case UCALL_PRINTF: + ksft_print_msg("From guest: %s", uc.buffer); + case UCALL_DONE: + ksft_print_msg("Guest done gracefully!\n"); + guest_done = true; + break; + default: + TEST_FAIL("Unexpected ucall: %lu", uc.cmd); + } + } while (!guest_done); +} + +static void vcpu_inject_ext_iabt(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_events events = {}; + + events.exception.ext_iabt_pending = true; + vcpu_events_set(vcpu, &events); +} + +static void vcpu_inject_invalid_abt(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_events events = {}; + int r; + + events.exception.ext_iabt_pending = true; + events.exception.ext_dabt_pending = true; + + ksft_print_msg("Injecting invalid external abort events\n"); + r = __vcpu_ioctl(vcpu, KVM_SET_VCPU_EVENTS, &events); + TEST_ASSERT(r && errno == EINVAL, + KVM_IOCTL_ERROR(KVM_SET_VCPU_EVENTS, r)); +} + +static void test_inject_iabt(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + + vm_init_descriptor_tables(vm); + vcpu_init_descriptor_tables(vcpu); + + vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, + ESR_ELx_EC_IABT_CUR, expect_iabt_handler); + + vcpu_inject_invalid_abt(vcpu); + + vcpu_inject_ext_iabt(vcpu); + vcpu_run_expect_done(vcpu); + + kvm_vm_free(vm); +} + +int main(void) +{ + test_inject_iabt(); + return 0; +}