Add a simple NV selftest that uses the NV library functions to eret from vEL2 to EL1, then call an hvc to jump back to vEL2.
Signed-off-by: Wei-Lin Chang <[email protected]> --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/arm64/hello_nested.c | 65 +++++++++++++++++++ 2 files changed, 66 insertions(+) create mode 100644 tools/testing/selftests/kvm/arm64/hello_nested.c diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 5e681e8e0cd7..d7499609cd0c 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -167,6 +167,7 @@ TEST_GEN_PROGS_arm64 += arm64/arch_timer_edge_cases TEST_GEN_PROGS_arm64 += arm64/at TEST_GEN_PROGS_arm64 += arm64/debug-exceptions TEST_GEN_PROGS_arm64 += arm64/hello_el2 +TEST_GEN_PROGS_arm64 += arm64/hello_nested TEST_GEN_PROGS_arm64 += arm64/host_sve TEST_GEN_PROGS_arm64 += arm64/hypercalls TEST_GEN_PROGS_arm64 += arm64/external_aborts diff --git a/tools/testing/selftests/kvm/arm64/hello_nested.c b/tools/testing/selftests/kvm/arm64/hello_nested.c new file mode 100644 index 000000000000..16c600539810 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/hello_nested.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * hello_nested - Go from vEL2 to EL1 then back + */ +#include "kvm_util.h" +#include "nested.h" +#include "processor.h" +#include "test_util.h" +#include "ucall.h" + +static void l2_guest_code(void) +{ + /* nothing */ +} + +static void guest_code(void) +{ + GUEST_ASSERT_EQ(get_current_el(), 2); + GUEST_PRINTF("vEL2 entry\n"); + run_l2(); + GUEST_DONE(); +} + +int main(void) +{ + struct kvm_vcpu_init init; + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + struct ucall uc; + + TEST_REQUIRE(kvm_check_cap(KVM_CAP_ARM_EL2)); + vm = vm_create(1); + + kvm_get_default_vcpu_target(vm, &init); + init.features[0] |= BIT(KVM_ARM_VCPU_HAS_EL2); + vcpu = aarch64_vcpu_add(vm, 0, &init, guest_code); + kvm_arch_vm_finalize_vcpus(vm); + + prepare_l2_stack(vm, vcpu); + prepare_hyp_state(vm, vcpu); + prepare_eret_destination(vm, vcpu, l2_guest_code); + prepare_nested_sync_handler(vm, vcpu); + + while (true) { + vcpu_run(vcpu); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_PRINTF: + pr_info("%s", uc.buffer); + break; + case UCALL_DONE: + pr_info("DONE!\n"); + goto end; + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + fallthrough; + default: + TEST_FAIL("Unhandled ucall: %ld\n", uc.cmd); + } + } + +end: + kvm_vm_free(vm); + return 0; +} -- 2.43.0
