linux-kernel - [PATCH 8/9] KVM: SVM: Add checks for IO instructions

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Message-ID: <1290622715-8382-9-git-send-email-joerg.roedel@amd.com>
Date:	Wed, 24 Nov 2010 19:18:34 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>
CC:	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 8/9] KVM: SVM: Add checks for IO instructions

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

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c |   55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 55 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2a30b5b..a2c513d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3668,6 +3668,47 @@ static void svm_check_group7(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
 	}
 }
 
+static void svm_check_ioio(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
+{
+	struct decode_cache *c;
+	u32 bytes, seg;
+	u32 exit_info;
+
+	c         = &ctxt->decode;
+	/* Encode Port */
+	exit_info = (c->regs[VCPU_REGS_RDX] & 0xffff) << 16;
+	seg       = 0;
+
+	/* Encode Address Size */
+	exit_info |= (u32)c->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);
+
+	if (c->rep_prefix)
+		exit_info |= SVM_IOIO_REP_MASK;
+
+	if ((c->b & 0x06) == 0x06) {
+		/* OUT* Instruction */
+		bytes = c->dst.bytes;
+	} else {
+		/* IN* Instruction */
+		bytes      = c->src.bytes;
+		exit_info |= SVM_IOIO_TYPE_MASK;
+	}
+
+	/* Encode Data Size */
+	bytes      = min(bytes, 4u);
+	exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;
+
+	/* Check for the string variants */
+	if ((c->b & 0xf0) == 0x60) {
+		exit_info |= SVM_IOIO_STR_MASK;
+		exit_info |= (seg & 0x07) << 10;
+	}
+
+	vmcb->control.exit_info_1 = exit_info;
+	vmcb->control.exit_info_2 = ctxt->eip;
+	vmcb->control.exit_code   = SVM_EXIT_IOIO;
+}
+
 static void svm_check_onebyte(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
 {
 	struct decode_cache *c = &ctxt->decode;
@@ -3685,6 +3726,20 @@ static void svm_check_onebyte(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
 	case 0xcd: /* INTn */
 		vmcb->control.exit_code = SVM_EXIT_SWINT;
 		break;
+	case 0x6c: /* INS */
+	case 0x6d:
+	case 0xe4: /* IN */
+	case 0xe5:
+	case 0xec:
+	case 0xed:
+	case 0x6e: /* OUTS */
+	case 0x6f:
+	case 0xe6: /* OUT */
+	case 0xe7:
+	case 0xee:
+	case 0xef:
+		svm_check_ioio(vmcb, ctxt);
+		break;
 	case 0xcf: /* IRET */
 		vmcb->control.exit_code = SVM_EXIT_IRET;
 		break;
-- 
1.7.1


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