linux-kernel - [RFC PATCH v2 4/9] KVM: arm64: nv: selftests: enable aarch32_id

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Message-ID: <20250512105251.577874-5-gankulkarni@os.amperecomputing.com>
Date: Mon, 12 May 2025 03:52:46 -0700
From: Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
To: linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: maz@...nel.org,
	oliver.upton@...ux.dev,
	joey.gouly@....com,
	suzuki.poulose@....com,
	yuzenghui@...wei.com,
	seanjc@...gle.com,
	darren@...amperecomputing.com,
	gankulkarni@...amperecomputing.com
Subject: [RFC PATCH v2 4/9] KVM: arm64: nv: selftests: enable aarch32_id_regs test to run in vEL2

Extend the testing of AArch32 ID registers with guest code
with NV enabled.

NV is enabled using command line argument and it is disabled by default.

Signed-off-by: Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
---
 .../selftests/kvm/arm64/aarch32_id_regs.c     | 34 +++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/arm64/aarch32_id_regs.c b/tools/testing/selftests/kvm/arm64/aarch32_id_regs.c
index cef8f7323ceb..8a9afda8a3e2 100644
--- a/tools/testing/selftests/kvm/arm64/aarch32_id_regs.c
+++ b/tools/testing/selftests/kvm/arm64/aarch32_id_regs.c
@@ -11,6 +11,7 @@
 #include <stdint.h>
 
 #include "kvm_util.h"
+#include "nv_util.h"
 #include "processor.h"
 #include "test_util.h"
 #include <linux/bitfield.h>
@@ -150,12 +151,38 @@ static bool vcpu_aarch64_only(struct kvm_vcpu *vcpu)
 	return el0 == ID_AA64PFR0_EL1_EL0_IMP;
 }
 
-int main(void)
+static void help(const char *name)
+{
+	pr_info("Usage: %s [-g enable]\n", name);
+	pr_info("\t-g: Enable Nested Virtualization, run guest code as guest hypervisor (default: Disabled)\n");
+	exit(1);
+}
+
+int main(int argc, char **argv)
 {
 	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
+	int gic_fd;
+	int opt;
+	bool is_nested = false;
+
+
+	while ((opt = getopt(argc, argv, "h:g:")) != -1) {
+		switch (opt) {
+		case 'g':
+			is_nested = atoi_non_negative("Is Nested", optarg);
+			break;
+		case 'h':
+		default:
+			help(argv[0]);
+			break;
+		}
+	}
 
-	vm = vm_create_with_one_vcpu(&vcpu, guest_main);
+	if (is_nested)
+		vm = nv_vm_create_with_vcpus_gic(1, &vcpu, &gic_fd, guest_main);
+	else
+		vm = vm_create_with_one_vcpu(&vcpu, guest_main);
 
 	TEST_REQUIRE(vcpu_aarch64_only(vcpu));
 
@@ -163,5 +190,8 @@ int main(void)
 	test_user_raz_invariant(vcpu);
 	test_guest_raz(vcpu);
 
+	if (is_nested)
+		close(gic_fd);
+
 	kvm_vm_free(vm);
 }
-- 
2.48.1