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Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios
From: |
Kevin O'Connor |
Subject: |
Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios |
Date: |
Sun, 22 Nov 2009 12:40:24 -0500 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Sun, Nov 22, 2009 at 05:38:09PM +0200, Gleb Natapov wrote:
> On Sun, Nov 22, 2009 at 04:31:24PM +0100, Sebastian Herbszt wrote:
> > // Write protect bios memory.
> > make_bios_readonly();
> Hmmm. How is tpr patching works then? It relies on ability of a guest to
> write into BIOS memory region. Need to retest if it actually works I
> guess.
The last time I looked, the TPR patching backend forced the "vapic"
pages to be writable (effectively overriding the bios decision to make
it readonly).
> > Bad things could happen if someone modifies the BIOS because it's
> > unprotected
> > (e.g. VM crash).
I'm not sure why modification of the BIOS would cause a VM crash. If
this is true, then a malicious guest could unlock the ram and write to
it for the same effect.
-Kevin
- [Qemu-devel] POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/19
- [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Kevin O'Connor, 2009/11/20
- [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/21
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios,
Kevin O'Connor <=
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/23
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/23
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/22
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/23
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/23
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/23
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Sebastian Herbszt, 2009/11/23
- Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios, Gleb Natapov, 2009/11/24