linux-kernel - [PATCH 10/10] KVM: VMX: Reset mmu context when entering real mode

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Date:	Sun,  2 Dec 2007 13:18:47 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	stable@...nel.org
Cc:	linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net,
	Eddie Dong <eddie.dong@...el.com>, Qing He <qing.he@...el.com>,
	Avi Kivity <avi@...ranet.com>
Subject: [PATCH 10/10] KVM: VMX: Reset mmu context when entering real mode

From: Eddie Dong <eddie.dong@...el.com>

Resetting an SMP guest will force AP enter real mode (RESET) with
paging enabled in protected mode. While current enter_rmode() can
only handle mode switch from nonpaging mode to real mode which leads
to SMP reboot failure.

Fix by reloading the mmu context on entering real mode.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@...el.com>
Signed-off-by: Qing He <qing.he@...el.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 drivers/kvm/mmu.c |    1 +
 drivers/kvm/vmx.c |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 23965aa..56ab369 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -1066,6 +1066,7 @@ int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
 	destroy_kvm_mmu(vcpu);
 	return init_kvm_mmu(vcpu);
 }
+EXPORT_SYMBOL_GPL(kvm_mmu_reset_context);
 
 int kvm_mmu_load(struct kvm_vcpu *vcpu)
 {
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index c158a2d..916da29 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -957,6 +957,7 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
 	fix_rmode_seg(VCPU_SREG_GS, &vcpu->rmode.gs);
 	fix_rmode_seg(VCPU_SREG_FS, &vcpu->rmode.fs);
 
+	kvm_mmu_reset_context(vcpu);
 	init_rmode_tss(vcpu->kvm);
 }
 
-- 
1.5.3

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