From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: kernel 3.9.x kvm hangs after seabios
Date: Wed, 8 May 2013 17:43:48 +0300
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To: Tomas Papan <tomas.papan@gmail.com>
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On Wed, May 08, 2013 at 03:50:47PM +0200, Tomas Papan wrote:
> Ok, the cpu stays at 0% when it hangs, there is only one 100% cpu peak
> which happens when the vm starts ( I think this is quite normal).
> 
> However I run following command, and I stop it right when it hangs:
> anakin trace2 # virsh start vm-jack; pid=`virsh qemu-monitor-command
> vm-jack --hmp info cpus | grep '\*' | awk '{print $5}' | cut -d\=
> -f2`; trace-cmd record -P $pid -p function
> 
> if anyone is interested it produces a 1.6 GB file (the compressed
> version can be found here: http://papan.sk/share/trace2.dat.tar.gz
> (150 MB))
> 
Thanks! Can you test the patch below:

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6667042..0af1807 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5197,6 +5197,12 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
 			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())
--
			Gleb.