[PATCH v14 03/13] KVM: x86: Add #CP support in guest exception dispatch

Yang Weijiang
2020-11-06T01:07:25Z

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@intel.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 89e5f3d1bba8..9dc2c58d894b 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -31,6 +31,7 @@
#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 0823bf1e2977..0433015ee443 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -433,6 +433,7 @@ 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 3900ab0c6004..74858c18978a 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -115,7 +115,7 @@ 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;
}
--
2.17.2