Re: [Qemu-devel] [edk2] OVMF hung on qemu 1.6.0 with KVM

["Andreas Färber" <afaerber@suse.de>]

Am 28.08.2013 13:45, schrieb Laszlo Ersek:
> (qemu-devel CC'd)
> 
> On 08/28/13 12:35, Gary Ching-Pang Lin wrote:
>> Hi,
>>
>> I recently updated qemu to 1.6.0 and found OVMF just showed a blank
>> screen when kvm was enabled. I tried to dump OVMF log with the
>> following commond but nothing was stored in debug.log.
>>
>> qemu-system-x86_64 -s -enable-kvm -bios OVMF.fd -debugcon file:debug.log -global isa-debugcon.iobase=0x402
>>
>> The kvm trace was recorded with "trace-cmd record -b 20000 -e kvm"
>> and uploaded to the following link:
>> https://docs.google.com/file/d/0B9hbtlc_aK_gcGh2TDZLUVlzWWc/edit?usp=sharing
>>
>> I found a similar case with kernel < 3.9, but I already upgraded linux
>> kernel to 3.10.5, so this may be another bug.
> 
> Well, the usual first response in cases like this is...
> 
> Can you bisect qemu? :)

We had a similar report:
https://bugzilla.novell.com/show_bug.cgi?id=835895

git-bisect said:
235e8982ad393e5611cb892df54881c872eea9e1 is the first bad commit
commit 235e8982ad393e5611cb892df54881c872eea9e1
Author: Jordan Justen <jordan.l.justen@intel.com>
Date:   Wed May 29 01:27:26 2013 -0700

    kvm: support using KVM_MEM_READONLY flag for regions

    For readonly memory regions and rom devices in romd_mode,
    we make use of the KVM_MEM_READONLY. A slot that uses
    KVM_MEM_READONLY can be read from and code can execute from the
    region, but writes will exit to qemu.

    For rom devices with !romd_mode, we force the slot to be
    removed so reads or writes to the region will exit to qemu.
    (Note that a memory region in this state is not executable
    within kvm.)

    v7:
     * Update for readable => romd_mode rename (5f9a5ea1)

    Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
    Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> (v4)
    Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> (v5)
    Message-id: 1369816047-16384-4-git-send-email-jordan.l.justen@intel.com
    Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


Any hints or patches welcome. :)

Regards,
Andreas

-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg