[SeaBIOS] [PATCH 00/11] Relocate init code to high memory

Kevin O'Connor kevin at koconnor.net
Sun Sep 19 23:54:41 CEST 2010

On Thu, Sep 16, 2010 at 07:31:46PM -0400, Kevin O'Connor wrote:
> On Thu, Sep 16, 2010 at 06:34:04PM +0200, Avi Kivity wrote:
> >  On 09/16/2010 04:31 AM, Kevin O'Connor wrote:
> > >Unfortunately, both qemu and kvm don't appear to have a reliable way
> > >to hard-reboot - normal reboots don't reset the 0xc0000-0xfffff
> > >memory.  I've worked around this on qemu by manually resetting that
> > >memory.  However, kvm doesn't keep a pristine copy of the bios at
> > >0xffff0000.  Until this is fixed, this patch series will cause a
> > >soft-reboot on kvm to result in a shutdown instead of a reboot.
> To work around this, patch 7 does a copy from 0xffff0000 to 0xf0000 to
> manually clear the f-segment (qemu_prep_reset).  This hack works okay
> for qemu.  Unfortunately, it doesn't work for kvm - even after the
> copy HaveRunPost is still set.  Normally, 0xffff0000 would have a
> pristine copy of the bios - changes to 0xf0000 should not also change
> 0xffff0000, but it looks like kvm does something different.

Hi Avi,

Are you okay with me applying this patch series to seabios?  It will
cause kvm guest reboots to turn into shutdowns until kvm can be


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