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Re: [Qemu-devel] Stack corruption problem with SeaBIOS/gPXE under QEMU

From: Gleb Natapov
Subject: Re: [Qemu-devel] Stack corruption problem with SeaBIOS/gPXE under QEMU
Date: Wed, 18 Nov 2009 16:19:49 +0200

On Wed, Nov 18, 2009 at 03:50:20PM +0200, Avi Kivity wrote:
> On 11/18/2009 11:39 AM, Gleb Natapov wrote:
> >
> >>Hi Avi,
> >>
> >>Can you send the full qemu command line that you used?  I can't seem
> >>to reproduce this on my setup.
> >>
> >>I do see an issue if SeaBIOS's reboot vector is called (eg, by using
> >>"sendkey ctrl-alt-delete" while still in the bios) because seabios
> >>allows gpxe to modify itself, and on a seabios only reboot the gpxe
> >>rom isn't recopied and gpxe therefore gets confused.  However, on a
> >>linux invoked reboot, it looks like a full machine reset occurs and
> >>qemu recopies the gpxe rom, so that doesn't seem to be an issue.
> >>
> >Do we have the same problem with tpr patching rom (vapic,bin)? It modifies
> >itself too.
> But a reset will reload it.
Correct, but Kevin says "sendkey ctrl-alt-delete" jumps to SeaBIOS's
reboot vector without issuing system reset. I am talking about this situation.


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