linux-kernel - [PATCH 2/7] KVM: x86: Function for determining exception type

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Date:	Mon, 21 Jul 2014 14:37:25 +0300
From:	Nadav Amit <namit@...technion.ac.il>
To:	pbonzini@...hat.com
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...nel.org, linux-kernel@...r.kernel.org,
	Nadav Amit <namit@...technion.ac.il>
Subject: [PATCH 2/7] KVM: x86: Function for determining exception type

New function for determining the x86 exception type: fault, abort, trap, etc.
This function is used by the next patch for setting rflags.rf upon faults.

Signed-off-by: Nadav Amit <namit@...technion.ac.il>
---
 arch/x86/kvm/x86.c | 35 +++++++++++++++++++++++++++++++++++
 arch/x86/kvm/x86.h |  9 +++++++++
 2 files changed, 44 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f750b69..c2aa58e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -311,6 +311,41 @@ static int exception_class(int vector)
 	return EXCPT_BENIGN;
 }
 
+int kvm_exception_type(unsigned int nr)
+{
+	switch (nr) {
+	case DE_VECTOR:
+	case BR_VECTOR:
+	case UD_VECTOR:
+	case NM_VECTOR:
+	case TS_VECTOR:
+	case NP_VECTOR:
+	case SS_VECTOR:
+	case GP_VECTOR:
+	case PF_VECTOR:
+	case MF_VECTOR:
+	case AC_VECTOR:
+	case XM_VECTOR:
+	case VE_VECTOR:
+		return EXCPT_FAULT;
+	case DB_VECTOR:
+		return EXCPT_FAULT_OR_TRAP;
+	case BP_VECTOR:
+	case OF_VECTOR:
+		return EXCPT_TRAP;
+	case DF_VECTOR:
+	case MC_VECTOR:
+		return EXCPT_ABORT;
+	case 15:
+	case 21 ... 31:
+		return EXCPT_RESERVED;
+	default:
+		break;
+	}
+	return EXCPT_INTERRUPT;
+}
+EXPORT_SYMBOL_GPL(kvm_exception_type);
+
 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 		unsigned nr, bool has_error, u32 error_code,
 		bool reinject)
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 306a1b7..b413181 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -151,6 +151,15 @@ int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
 
 #define KVM_SUPPORTED_XCR0     (XSTATE_FP | XSTATE_SSE | XSTATE_YMM \
 				| XSTATE_BNDREGS | XSTATE_BNDCSR)
+
+#define EXCPT_FAULT		0
+#define EXCPT_TRAP		1
+#define EXCPT_FAULT_OR_TRAP	2
+#define EXCPT_ABORT		3
+#define EXCPT_RESERVED		4
+#define EXCPT_INTERRUPT		5
+int kvm_exception_type(unsigned int nr);
+
 extern u64 host_xcr0;
 
 extern u64 kvm_supported_xcr0(void);
-- 
1.9.1

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