1 files changed, 44 insertions, 40 deletions

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index c5c46f5b767c..c4d368d56cfe 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -552,40 +552,6 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
 	vcpu_sregs_set(vcpu, &sregs);
 }
 
-void __vm_xsave_require_permission(int bit, const char *name)
-{
-	int kvm_fd;
-	u64 bitmask;
-	long rc;
-	struct kvm_device_attr attr = {
-		.group = 0,
-		.attr = KVM_X86_XCOMP_GUEST_SUPP,
-		.addr = (unsigned long) &bitmask
-	};
-
-	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XFD));
-
-	kvm_fd = open_kvm_dev_path_or_exit();
-	rc = __kvm_ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr);
-	close(kvm_fd);
-
-	if (rc == -1 && (errno == ENXIO || errno == EINVAL))
-		__TEST_REQUIRE(0, "KVM_X86_XCOMP_GUEST_SUPP not supported");
-
-	TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc);
-
-	__TEST_REQUIRE(bitmask & (1ULL << bit),
-		       "Required XSAVE feature '%s' not supported", name);
-
-	TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit));
-
-	rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask);
-	TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc);
-	TEST_ASSERT(bitmask & (1ULL << bit),
-		    "prctl(ARCH_REQ_XCOMP_GUEST_PERM) failure bitmask=0x%lx",
-		    bitmask);
-}
-
 void kvm_arch_vm_post_create(struct kvm_vm *vm)
 {
 	vm_create_irqchip(vm);
@@ -636,21 +602,24 @@ void vcpu_arch_free(struct kvm_vcpu *vcpu)
 		free(vcpu->cpuid);
 }
 
+/* Do not use kvm_supported_cpuid directly except for validity checks. */
+static void *kvm_supported_cpuid;
+
 const struct kvm_cpuid2 *kvm_get_supported_cpuid(void)
 {
-	static struct kvm_cpuid2 *cpuid;
 	int kvm_fd;
 
-	if (cpuid)
-		return cpuid;
+	if (kvm_supported_cpuid)
+		return kvm_supported_cpuid;
 
-	cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
+	kvm_supported_cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
 	kvm_fd = open_kvm_dev_path_or_exit();
 
-	kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID, cpuid);
+	kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID,
+		  (struct kvm_cpuid2 *)kvm_supported_cpuid);
 
 	close(kvm_fd);
-	return cpuid;
+	return kvm_supported_cpuid;
 }
 
 static uint32_t __kvm_cpu_has(const struct kvm_cpuid2 *cpuid,
@@ -708,6 +677,41 @@ uint64_t kvm_get_feature_msr(uint64_t msr_index)
 	return buffer.entry.data;
 }
 
+void __vm_xsave_require_permission(int bit, const char *name)
+{
+	int kvm_fd;
+	u64 bitmask;
+	long rc;
+	struct kvm_device_attr attr = {
+		.group = 0,
+		.attr = KVM_X86_XCOMP_GUEST_SUPP,
+		.addr = (unsigned long) &bitmask
+	};
+
+	TEST_ASSERT(!kvm_supported_cpuid,
+		    "kvm_get_supported_cpuid() cannot be used before ARCH_REQ_XCOMP_GUEST_PERM");
+
+	kvm_fd = open_kvm_dev_path_or_exit();
+	rc = __kvm_ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr);
+	close(kvm_fd);
+
+	if (rc == -1 && (errno == ENXIO || errno == EINVAL))
+		__TEST_REQUIRE(0, "KVM_X86_XCOMP_GUEST_SUPP not supported");
+
+	TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc);
+
+	__TEST_REQUIRE(bitmask & (1ULL << bit),
+		       "Required XSAVE feature '%s' not supported", name);
+
+	TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit));
+
+	rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask);
+	TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc);
+	TEST_ASSERT(bitmask & (1ULL << bit),
+		    "prctl(ARCH_REQ_XCOMP_GUEST_PERM) failure bitmask=0x%lx",
+		    bitmask);
+}
+
 void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid)
 {
 	TEST_ASSERT(cpuid != vcpu->cpuid, "@cpuid can't be the vCPU's CPUID");