[PATCH v2 2/2] KVM: arm64: selftests: tests for vgic redist regions above the VM IPA size

[Ricardo Koller <ricarkol@google.com>]

These new tests attempt (and fail) to set a redist region using the
KVM_VGIC_V3_ADDR_TYPE_REDIST and KVM_VGIC_V3_ADDR_TYPE_REDIST_REGIONS
with regions partially above the VM-specified IPA size (phys_size).

Signed-off-by: Ricardo Koller <ricarkol@google.com>
---
 .../testing/selftests/kvm/aarch64/vgic_init.c | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/tools/testing/selftests/kvm/aarch64/vgic_init.c b/tools/testing/selftests/kvm/aarch64/vgic_init.c
index 623f31a14326..15aa01dc6a4d 100644
--- a/tools/testing/selftests/kvm/aarch64/vgic_init.c
+++ b/tools/testing/selftests/kvm/aarch64/vgic_init.c
@@ -285,6 +285,57 @@ static void test_vcpus_then_vgic(void)
 	vm_gic_destroy(&v);
 }
 
+static void test_redist_above_vm_pa_bits(enum vm_guest_mode mode)
+{
+	struct vm_gic v;
+	int ret, i;
+	uint32_t vcpuids[] = { 1, 2, 3, 4, };
+	int pa_bits = vm_guest_mode_params[mode].pa_bits;
+	uint64_t addr, psize = 1ULL << pa_bits;
+
+	/* Add vcpu 1 */
+	v.vm = vm_create_with_vcpus(mode, 1, DEFAULT_GUEST_PHY_PAGES,
+				    0, 0, guest_code, vcpuids);
+	v.gic_fd = kvm_create_device(v.vm, KVM_DEV_TYPE_ARM_VGIC_V3, false);
+
+	/* The redist end is above the IPA size, so this fails. */
+	addr = REDIST_REGION_ATTR_ADDR(1, psize - 0x10000, 0, 0);
+	ret = _kvm_device_access(v.gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+				 KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &addr, true);
+	TEST_ASSERT(ret && errno == E2BIG,
+		"register redist region with end address beyond IPA range");
+
+	/* Set space for half a redist, we have 1 vcpu, so this fails. */
+	addr = psize - 0x10000;
+	ret = _kvm_device_access(v.gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+				 KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
+	TEST_ASSERT(ret && errno == E2BIG,
+		"register redist (legacy) with end address beyond IPA range");
+
+	/* Set space for 3 redists, we have 1 vcpu, so this succeeds. */
+	addr = psize - (3 * 2 * 0x10000);
+	kvm_device_access(v.gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+				 KVM_VGIC_V3_ADDR_TYPE_REDIST, &addr, true);
+
+	addr = 0x00000;
+	kvm_device_access(v.gic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
+			KVM_VGIC_V3_ADDR_TYPE_DIST, &addr, true);
+
+	/* Add the rest of the VCPUs */
+	for (i = 1; i < 4; ++i)
+		vm_vcpu_add_default(v.vm, vcpuids[i], guest_code);
+
+	kvm_device_access(v.gic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
+			  KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true);
+
+	/* Attempt to run a vcpu without enough redist space. */
+	ret = run_vcpu(v.vm, vcpuids[3]);
+	TEST_ASSERT(ret && errno == EINVAL,
+			"redist base+size above IPA detected on 1st vcpu run");
+
+	vm_gic_destroy(&v);
+}
+
 static void test_new_redist_regions(void)
 {
 	void *dummy = NULL;
@@ -542,6 +593,7 @@ int main(int ac, char **av)
 	test_kvm_device();
 	test_vcpus_then_vgic();
 	test_vgic_then_vcpus();
+	test_redist_above_vm_pa_bits(VM_MODE_DEFAULT);
 	test_new_redist_regions();
 	test_typer_accesses();
 	test_last_bit_redist_regions();
-- 
2.33.0.309.g3052b89438-goog

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