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Date: Thu, 25 Jul 2013 14:30:44 +0300
From: Gleb Natapov <gleb@redhat.com>
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Subject: Re: [Qemu-devel] VM can not boot after commit 235e898
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To: Alexander Graf <agraf@suse.de>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Jordan Justen <jordan.l.justen@intel.com>, qemu-devel Developers <qemu-devel@nongnu.org>, Dunrong Huang <riegamaths@gmail.com>, Hannes Reinecke <hare@suse.de>, Paolo Bonzini <pbonzini@redhat.com>, Jordan Justen <jljusten@gmail.com>

On Wed, Jul 24, 2013 at 10:25:49PM +0200, Alexander Graf wrote:
> On 07/24/2013 06:53 PM, Gleb Natapov wrote:
> >On Wed, Jul 24, 2013 at 06:26:41PM +0200, Alexander Graf wrote:
> >>>before. Are you saying configuring BIOS memslot differently solves the
> >>>problem?
> >>Git bisect pointed to the commit mentioned in this email. The
> >>following patch also gets me a working guest again:
> >>
> >>diff --git a/kvm-all.c b/kvm-all.c
> >>index 4fb4ccb..deca9e5 100644
> >>--- a/kvm-all.c
> >>+++ b/kvm-all.c
> >>@@ -1455,7 +1455,7 @@ int kvm_init(void)
> >>          s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
> >>      }
> >>
> >>-#ifdef KVM_CAP_READONLY_MEM
> >>+#if 0 //def KVM_CAP_READONLY_MEM
> >>      kvm_readonly_mem_allowed =
> >>          (kvm_check_extension(s, KVM_CAP_READONLY_MEM)>  0);
> >>  #endif
> >>
> >Can you disable emulate_invalid_state on 3.7?
> 
> I could only find emulate_invalid_guest_state. I suppose you mean
> that one? :)
> 
That one will do :)

> $ rmmod kvm-intel
> $ modprobe kvm-intel emulate_invalid_guest_state=n
> $ ./x86_64-softmmu/qemu-system-x86_64 -nographic -kernel
> /boot/vmlinuz -append console=ttyS0 -bios pc-bios/bios.bin
> -enable-kvm
> QEMU 1.5.50 monitor - type 'help' for more information
> (qemu)
> KVM: entry failed, hardware error 0x80000021
> 
Yeah, emulate_invalid_guest_state=0 was broken for a while. Can you try
applying a4d3326c2de46fd7bcc47d1e8786efccfc152f81 on top of 3.7
and try again with emulate_invalid_guest_state=0?

> >What happens on upstream kernel
> >(works for me obviously :)).
> 
> kvm-kmod from 3.9 works.
> 
Doing backwards bisect to see where it was fixed would be interesting.

--
			Gleb.