This is a note to let you know that I've just added the patch titled
KVM: VMX: fix halt emulation while emulating invalid guest sate
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-vmx-fix-halt-emulation-while-emulating-invalid-guest-sate.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8d76c49e9ffeee839bc0b7a3278a23f99101263e Mon Sep 17 00:00:00 2001
From: Gleb Natapov <gleb@xxxxxxxxxx>
Date: Wed, 8 May 2013 18:38:44 +0300
Subject: KVM: VMX: fix halt emulation while emulating invalid guest sate
From: Gleb Natapov <gleb@xxxxxxxxxx>
commit 8d76c49e9ffeee839bc0b7a3278a23f99101263e upstream.
The invalid guest state emulation loop does not check halt_request
which causes 100% cpu loop while guest is in halt and in invalid
state, but more serious issue is that this leaves halt_request set, so
random instruction emulated by vm86 #GP exit can be interpreted
as halt which causes guest hang. Fix both problems by handling
halt_request in emulation loop.
Reported-by: Tomas Papan <tomas.papan@xxxxxxxxx>
Tested-by: Tomas Papan <tomas.papan@xxxxxxxxx>
Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5197,6 +5197,12 @@ static int handle_invalid_guest_state(st
return 0;
}
+ if (vcpu->arch.halt_request) {
+ vcpu->arch.halt_request = 0;
+ ret = kvm_emulate_halt(vcpu);
+ goto out;
+ }
+
if (signal_pending(current))
goto out;
if (need_resched())
Patches currently in stable-queue which might be from gleb@xxxxxxxxxx are
queue-3.9/kvm-emulator-emulate-salc.patch
queue-3.9/kvm-emulator-emulate-aam.patch
queue-3.9/kvm-vmx-fix-halt-emulation-while-emulating-invalid-guest-sate.patch
queue-3.9/kvm-emulator-emulate-xlat.patch
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