linux-kernel - [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception dispatch

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Date:   Wed,  3 Feb 2021 19:34:11 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, jmattson@...gle.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     yu.c.zhang@...ux.intel.com, Yang Weijiang <weijiang.yang@...el.com>
Subject: [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception dispatch

Add handling for Control Protection (#CP) exceptions, vector 21, used
and introduced by Intel's Control-Flow Enforcement Technology (CET).
relevant CET violation case.  See Intel's SDM for details.

Signed-off-by: Yang Weijiang <weijiang.yang@...el.com>
---
 arch/x86/include/uapi/asm/kvm.h | 1 +
 arch/x86/kvm/x86.c              | 1 +
 arch/x86/kvm/x86.h              | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 8e76d3701db3..507263d1d0b2 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -32,6 +32,7 @@
 #define MC_VECTOR 18
 #define XM_VECTOR 19
 #define VE_VECTOR 20
+#define CP_VECTOR 21
 
 /* Select x86 specific features in <linux/kvm.h> */
 #define __KVM_HAVE_PIT
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 99f787152d12..d9d3bae40a8c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -436,6 +436,7 @@ static int exception_class(int vector)
 	case NP_VECTOR:
 	case SS_VECTOR:
 	case GP_VECTOR:
+	case CP_VECTOR:
 		return EXCPT_CONTRIBUTORY;
 	default:
 		break;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index c5ee0f5ce0f1..bdbd0b023ecc 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -116,7 +116,7 @@ static inline bool x86_exception_has_error_code(unsigned int vector)
 {
 	static u32 exception_has_error_code = BIT(DF_VECTOR) | BIT(TS_VECTOR) |
 			BIT(NP_VECTOR) | BIT(SS_VECTOR) | BIT(GP_VECTOR) |
-			BIT(PF_VECTOR) | BIT(AC_VECTOR);
+			BIT(PF_VECTOR) | BIT(AC_VECTOR) | BIT(CP_VECTOR);
 
 	return (1U << vector) & exception_has_error_code;
 }
-- 
2.26.2