linux-kernel - [PATCH 2/3] KVM: Pass fs, gs segment bases to x86 emulator

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Date:	Mon, 20 Nov 2006 10:28:20 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	akpm@...l.org, kvm-devel@...ts.sourceforge.net,
	yaniv.kamay@...ranet.com, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] KVM: Pass fs, gs segment bases to x86 emulator

From: Yaniv Kamay <yaniv@...ranet.com>

The x86-64 respects segment bases for fs and gs.

Signed-off-by: Yaniv Kamay <yaniv@...ranet.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/kvm_main.c
===================================================================
--- linux-2.6.orig/drivers/kvm/kvm_main.c
+++ linux-2.6/drivers/kvm/kvm_main.c
@@ -1907,17 +1907,16 @@ static int emulate_instruction(struct kv
 		emulate_ctxt.ds_base = 0;
 		emulate_ctxt.es_base = 0;
 		emulate_ctxt.ss_base = 0;
-		emulate_ctxt.gs_base = 0;
-		emulate_ctxt.fs_base = 0;
 	} else {
 		emulate_ctxt.cs_base = vmcs_readl(GUEST_CS_BASE);
 		emulate_ctxt.ds_base = vmcs_readl(GUEST_DS_BASE);
 		emulate_ctxt.es_base = vmcs_readl(GUEST_ES_BASE);
 		emulate_ctxt.ss_base = vmcs_readl(GUEST_SS_BASE);
-		emulate_ctxt.gs_base = vmcs_readl(GUEST_GS_BASE);
-		emulate_ctxt.fs_base = vmcs_readl(GUEST_FS_BASE);
 	}
 
+	emulate_ctxt.gs_base = vmcs_readl(GUEST_GS_BASE);
+	emulate_ctxt.fs_base = vmcs_readl(GUEST_FS_BASE);
+
 	vcpu->mmio_is_write = 0;
 	r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
 
-
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