On Mon, May 12, 2025 at 03:52:44AM -0700, Ganapatrao Kulkarni wrote:
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;
+}
The kernel this v2 series applied is based off of the latest kvmarm-next and tested this on QEMU TCG mode with the kvm-arm.mode=nested option added at boot.
Tested-by: Itaru Kitayama itaru.kitayama@fujitsu.com
-- 2.48.1