linux-kernel - [PATCH 3/9] KVM: SVM: Add checks for DRx read and write intercepts

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Message-ID: <1290622715-8382-4-git-send-email-joerg.roedel@amd.com>
Date:	Wed, 24 Nov 2010 19:18:29 +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 3/9] KVM: SVM: Add checks for DRx read and write intercepts

This patch adds checking for read and write intercepts
from/to DRx registers from the KVM instruction emulator
path.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kvm/svm.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 29f0491..16ff569 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3669,6 +3669,9 @@ static int svm_insn_intercepted(struct kvm_vcpu *vcpu,
 	case 0x20: /* CR read  */
 		vmcb->control.exit_code = SVM_EXIT_READ_CR0 + c->modrm_reg;
 		break;
+	case 0x21:
+		vmcb->control.exit_code = SVM_EXIT_READ_DR0 + c->modrm_reg;
+		break;
 	case 0x22: /* CR write */
 		vmcb->control.exit_code = SVM_EXIT_WRITE_CR0 + c->modrm_reg;
 		if (c->modrm_reg == 0 &&
@@ -3683,6 +3686,9 @@ static int svm_insn_intercepted(struct kvm_vcpu *vcpu,
 				vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
 		}
 		break;
+	case 0x23:
+		vmcb->control.exit_code = SVM_EXIT_WRITE_DR0 + c->modrm_reg;
+		break;
 	}
 
 	vmcb->control.next_rip = ctxt->eip;
-- 
1.7.1


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