[PATCH 12/13] KVM: SVM: Add checks for IO instructions

[Joerg Roedel <joerg.roedel@xxxxxxx>]

This patch adds code to check for IOIO intercepts on
instructions decoded by the KVM instruction emulator.

Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
---
 arch/x86/include/asm/kvm_emulate.h |    4 ++++
 arch/x86/kvm/emulate.c             |   10 ++++++----
 arch/x86/kvm/svm.c                 |   36 ++++++++++++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index 41c0120..0b2e2de 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -317,6 +317,10 @@ enum x86_intercept {
 	x86_intercept_mwait,
 	x86_intercept_rdmsr,
 	x86_intercept_wrmsr,
+	x86_intercept_in,
+	x86_intercept_ins,
+	x86_intercept_out,
+	x86_intercept_outs,
 
 	nr_x86_intercepts
 };
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 4c0939d..879ce78 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2339,6 +2339,7 @@ static int em_mov(struct x86_emulate_ctxt *ctxt)
 	{ .flags = (_f), .u.execute = (_e), .intercept = x86_intercept_##_i }
 
 #define D2bv(_f)      D((_f) | ByteOp), D(_f)
+#define D2bvI(_f, _i) DI((_f) | ByteOp, _i), DI((_f), _i)
 #define I2bv(_f, _e)  I((_f) | ByteOp, _e), I(_f, _e)
 
 #define D6ALU(_f) D2bv((_f) | DstMem | SrcReg | ModRM),			\
@@ -2468,8 +2469,8 @@ static struct opcode opcode_table[256] = {
 	I(DstReg | SrcMem | ModRM | Src2Imm, em_imul_3op),
 	I(SrcImmByte | Mov | Stack, em_push),
 	I(DstReg | SrcMem | ModRM | Src2ImmByte, em_imul_3op),
-	D2bv(DstDI | Mov | String), /* insb, insw/insd */
-	D2bv(SrcSI | ImplicitOps | String), /* outsb, outsw/outsd */
+	D2bvI(DstDI | Mov | String, ins), /* insb, insw/insd */
+	D2bvI(SrcSI | ImplicitOps | String, outs), /* outsb, outsw/outsd */
 	/* 0x70 - 0x7F */
 	X16(D(SrcImmByte)),
 	/* 0x80 - 0x87 */
@@ -2520,11 +2521,11 @@ static struct opcode opcode_table[256] = {
 	N, N, N, N, N, N, N, N,
 	/* 0xE0 - 0xE7 */
 	X4(D(SrcImmByte)),
-	D2bv(SrcImmUByte | DstAcc), D2bv(SrcAcc | DstImmUByte),
+	D2bvI(SrcImmUByte | DstAcc, in), D2bvI(SrcAcc | DstImmUByte, out),
 	/* 0xE8 - 0xEF */
 	D(SrcImm | Stack), D(SrcImm | ImplicitOps),
 	D(SrcImmFAddr | No64), D(SrcImmByte | ImplicitOps),
-	D2bv(SrcNone | DstAcc),	D2bv(SrcAcc | ImplicitOps),
+	D2bvI(SrcNone | DstAcc, in), D2bvI(SrcAcc | ImplicitOps, out),
 	/* 0xF0 - 0xF7 */
 	N, DI(ImplicitOps, icebp), N, N,
 	DI(ImplicitOps | Priv, hlt), D(ImplicitOps),
@@ -2609,6 +2610,7 @@ static struct opcode twobyte_table[256] = {
 #undef EXT
 
 #undef D2bv
+#undef D2bvI
 #undef I2bv
 #undef D6ALU
 
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 847a3f9..1672e3c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3929,6 +3929,10 @@ static struct __x86_intercept {
 	[x86_intercept_iret]		= PRE_EX(SVM_EXIT_IRET),
 	[x86_intercept_icebp]		= PRE_EX(SVM_EXIT_ICEBP),
 	[x86_intercept_hlt]		= POST_EX(SVM_EXIT_HLT),
+	[x86_intercept_in]		= POST_EX(SVM_EXIT_IOIO),
+	[x86_intercept_ins]		= POST_EX(SVM_EXIT_IOIO),
+	[x86_intercept_out]		= POST_EX(SVM_EXIT_IOIO),
+	[x86_intercept_outs]		= POST_EX(SVM_EXIT_IOIO),
 };
 
 #undef PRE_EX
@@ -4004,6 +4008,38 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
 		 */
 		if (info->rep_prefix != REPE_PREFIX)
 			goto out;
+	case SVM_EXIT_IOIO: {
+		u64 exit_info;
+		u32 bytes;
+
+		exit_info = (vcpu->arch.regs[VCPU_REGS_RDX] & 0xffff) << 16;
+
+		if (info->intercept == x86_intercept_in ||
+		    info->intercept == x86_intercept_ins) {
+			exit_info |= SVM_IOIO_TYPE_MASK;
+			bytes = info->src_bytes;
+		} else {
+			bytes = info->dst_bytes;
+		}
+
+		if (info->intercept == x86_intercept_outs ||
+		    info->intercept == x86_intercept_ins)
+			exit_info |= SVM_IOIO_STR_MASK;
+
+		if (info->rep_prefix)
+			exit_info |= SVM_IOIO_REP_MASK;
+
+		bytes = min(bytes, 4u);
+
+		exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;
+
+		exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);
+
+		vmcb->control.exit_info_1 = exit_info;
+		vmcb->control.exit_info_2 = info->next_rip;
+
+		break;
+	}
 	default:
 		break;
 	}
-- 
1.7.1


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