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Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support |
Date: |
Sun, 28 Feb 2010 16:44:13 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Sun, Feb 28, 2010 at 12:45:07PM +0000, Paul Brook wrote:
> > > There certainly
> > > exist machines that can change physical RAM mapping.
> >
> > I am talking about mapping between phy RAM offset and qemu virt address.
> > When can it change without RAM in question going away?
>
> RAM offset or guest physical address? The two are very different.
RAM offset. virtio only cares about where the rings are.
> Some machines have chip selects that allow given physical address range to be
> mapped to different banks of ram.
>
> Paul
So guest can cause vhost to write to a wrong place in RAM, but it can
just pass a wrong address directly. As long as vhost does not access a
non-RAM address, we are definitely fine.
--
MST
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, (continued)
[Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Anthony Liguori, 2010/02/25
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/26
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Anthony Liguori, 2010/02/26
- [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/27
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Paul Brook, 2010/02/27
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Paul Brook, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support,
Michael S. Tsirkin <=
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Paul Brook, 2010/02/28
- Re: [Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Michael S. Tsirkin, 2010/02/28
[Qemu-devel] Re: [PATCHv2 09/12] vhost: vhost net support, Anthony Liguori, 2010/02/28
[Qemu-devel] [PATCHv2 02/12] kvm: add API to set ioeventfd, Michael S. Tsirkin, 2010/02/25
[Qemu-devel] [PATCHv2 04/12] virtio: add notifier support, Michael S. Tsirkin, 2010/02/25
[Qemu-devel] [PATCHv2 01/12] tap: add interface to get device fd, Michael S. Tsirkin, 2010/02/25
[Qemu-devel] [PATCHv2 07/12] virtio: move typedef to qemu-common, Michael S. Tsirkin, 2010/02/25
[Qemu-devel] [PATCHv2 10/12] tap: add vhost/vhostfd options, Michael S. Tsirkin, 2010/02/25