Add simple test to run guest code with NV enabled. With NV enabled, guest code runs in vEL2 context.
Signed-off-by: Ganapatrao Kulkarni gankulkarni@os.amperecomputing.com --- .../selftests/kvm/arm64/nv_guest_hypervisor.c | 68 +++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 tools/testing/selftests/kvm/arm64/nv_guest_hypervisor.c
diff --git a/tools/testing/selftests/kvm/arm64/nv_guest_hypervisor.c b/tools/testing/selftests/kvm/arm64/nv_guest_hypervisor.c new file mode 100644 index 000000000000..7d7b3944e229 --- /dev/null +++ b/tools/testing/selftests/kvm/arm64/nv_guest_hypervisor.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2025 Ampere Computing LLC + */ +#include <kvm_util.h> +#include <nv_util.h> +#include <processor.h> + +static void guest_code(void) +{ + if (read_sysreg(CurrentEL) == CurrentEL_EL2) + GUEST_PRINTF("Test PASS\n"); + else + GUEST_FAIL("Fail to run in vEL2\n"); + + GUEST_DONE(); +} + +static void guest_undef_handler(struct ex_regs *regs) +{ + GUEST_FAIL("Unexpected exception far_el1 = 0x%lx", read_sysreg(far_el1)); +} + +static void test_run_vcpu(struct kvm_vcpu *vcpu) +{ + struct ucall uc; + + do { + vcpu_run(vcpu); + + switch (get_ucall(vcpu, &uc)) { + case UCALL_ABORT: + REPORT_GUEST_ASSERT(uc); + break; + case UCALL_PRINTF: + printf("%s", uc.buffer); + break; + case UCALL_DONE: + break; + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); + } + } while (uc.cmd != UCALL_DONE); +} + +static void test_nv_guest_hypervisor(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + int gic_fd = -1; + + vm = nv_vm_create_with_vcpus_gic(1, &vcpu, &gic_fd, guest_code); + vm_init_descriptor_tables(vm); + vcpu_init_descriptor_tables(vcpu); + vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT, + ESR_ELx_EC_UNKNOWN, guest_undef_handler); + + test_run_vcpu(vcpu); + + vgic_v3_close(gic_fd); + kvm_vm_free(vm); +} + +int main(int argc, char *argv[]) +{ + test_nv_guest_hypervisor(); + return 0; +}