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Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) dev
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device |
Date: |
Mon, 19 Jul 2010 10:23:03 +0100 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Mon, Jul 19, 2010 at 12:19:22PM +0300, Gleb Natapov wrote:
> Vcpu executes "in %ax". Next instruction is executed 6 seconds later.
> All timers that should have been processed during this time fire at the
> same moment triggering all kind of timeouts. Think about watchdog that
> should be written into every two seconds otherwise it does reset.
This particular code runs very early in boot, and the atomic copy
operation is very quick even with a 100MB initrd.
But the question I think should be: If a guest maliciously (after
boot) tried to use this mechanism, could it do harm to the host? Or
would it just harm itself?
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
libguestfs lets you edit virtual machines. Supports shell scripting,
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- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, (continued)
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Alexander Graf, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Alexander Graf, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Alexander Graf, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Alexander Graf, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Alexander Graf, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device,
Richard W.M. Jones <=
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Jamie Lokier, 2010/07/20
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/20
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Richard W.M. Jones, 2010/07/20
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Richard W.M. Jones, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Richard W.M. Jones, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Richard W.M. Jones, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Gleb Natapov, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Richard W.M. Jones, 2010/07/19
- Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device, Richard W.M. Jones, 2010/07/19