linux-kernel - [PATCH 4/13] KVM: vmx: hack set_cr0_no_modeswitch() to actually do modeswitch

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Message-Id: <20070219102451.E848F25016B@il.qumranet.com>
Date:	Mon, 19 Feb 2007 10:24:51 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu
Subject: [PATCH 4/13] KVM: vmx: hack set_cr0_no_modeswitch() to actually do
	modeswitch

From: Markus Rechberger <markus.rechberger@....com>
From: Joerg Roedel <joerg.roedel@....com>

The whole thing is rotten, but this allows vmx to boot with the guest reboot
fix.

Signed-off-by: Markus Rechberger <markus.rechberger@....com>
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -791,6 +791,9 @@ static void vmx_set_cr0(struct kvm_vcpu 
  */
 static void vmx_set_cr0_no_modeswitch(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
+	if (!vcpu->rmode.active && !(cr0 & CR0_PE_MASK))
+		enter_rmode(vcpu);
+
 	vcpu->rmode.active = ((cr0 & CR0_PE_MASK) == 0);
 	update_exception_bitmap(vcpu);
 	vmcs_writel(CR0_READ_SHADOW, cr0);
-
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