linux-kernel - [PATCH 3/3] selftests: kvm: check dynamic bits against KVM_X86_XCOMP_GUEST

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Message-Id: <20220126152210.3044876-4-pbonzini@redhat.com>
Date:   Wed, 26 Jan 2022 10:22:10 -0500
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     yang.zhong@...el.com, seanjc@...gle.com
Subject: [PATCH 3/3] selftests: kvm: check dynamic bits against KVM_X86_XCOMP_GUEST_SUPP

Provide coverage for the new API.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 tools/arch/x86/include/uapi/asm/kvm.h             |  3 +++
 tools/include/uapi/linux/kvm.h                    |  1 +
 .../testing/selftests/kvm/lib/x86_64/processor.c  | 15 +++++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/tools/arch/x86/include/uapi/asm/kvm.h b/tools/arch/x86/include/uapi/asm/kvm.h
index 2da3316bb559..bf6e96011dfe 100644
--- a/tools/arch/x86/include/uapi/asm/kvm.h
+++ b/tools/arch/x86/include/uapi/asm/kvm.h
@@ -452,6 +452,9 @@ struct kvm_sync_regs {
 
 #define KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE	0x00000001
 
+/* attributes for system fd (group 0) */
+#define KVM_X86_XCOMP_GUEST_SUPP	0
+
 struct kvm_vmx_nested_state_data {
 	__u8 vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE];
 	__u8 shadow_vmcs12[KVM_STATE_NESTED_VMX_VMCS_SIZE];
diff --git a/tools/include/uapi/linux/kvm.h b/tools/include/uapi/linux/kvm.h
index 9563d294f181..b46bcdb0cab1 100644
--- a/tools/include/uapi/linux/kvm.h
+++ b/tools/include/uapi/linux/kvm.h
@@ -1133,6 +1133,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM 206
 #define KVM_CAP_VM_GPA_BITS 207
 #define KVM_CAP_XSAVE2 208
+#define KVM_CAP_SYS_ATTRIBUTES 209
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index c1d1c195a838..9f000dfb5594 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -667,8 +667,23 @@ static bool is_xfd_supported(void)
 
 void vm_xsave_req_perm(int bit)
 {
+	int kvm_fd;
 	u64 bitmask;
 	long rc;
+	struct kvm_device_attr attr = {
+		.group = 0,
+		.attr = KVM_X86_XCOMP_GUEST_SUPP,
+		.addr = (unsigned long) &bitmask
+	};
+
+	kvm_fd = open_kvm_dev_path_or_exit();
+	rc = ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr);
+	close(kvm_fd);
+	if (rc == -1 && (errno == ENXIO || errno == EINVAL))
+		exit(KSFT_SKIP);
+	TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc);
+	if (!(bitmask & (1ULL << bit)))
+		exit(KSFT_SKIP);
 
 	if (!is_xfd_supported())
 		exit(KSFT_SKIP);
-- 
2.31.1