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Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses
From: |
Isaku Yamahata |
Subject: |
Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses |
Date: |
Thu, 21 Jul 2011 01:17:02 +0900 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Wed, Jul 20, 2011 at 04:27:08PM +0200, Jan Kiszka wrote:
> On 2011-07-20 14:15, Jan Kiszka wrote:
> > On 2011-07-20 14:00, Isaku Yamahata wrote:
> >> Hi. This clean up looks good basically.
> >
> > Oops, forgot to cc you. Sorry.
> >
> >> But when conventional pci device is accessed via MMCONFIG area,
> >> addr &= addr_mask doesn't work as expected.
> >> The config area of [256, 4K) of conventional pci should have no effect.
> >
> > Mmh, I see. Looks like we need to split accesses at this boundary and
> > executed them separately.
>
> Nope, no such issue: we already automatically split up accesses that
> span the legacy/extended boundary. Just like so far, legacy config space
> handlers have to filter out requests that address regions >= 256.
For example, when accessing to offset 257 of conventional pci device,
the access is routed to offset 1 due to the masking.
Such overwrapping isn't correct.
--
yamahata
- [Qemu-devel] [PATCH] pci: Length-align config space accesses, Jan Kiszka, 2011/07/19
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Isaku Yamahata, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Jan Kiszka, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Jan Kiszka, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses,
Isaku Yamahata <=
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Michael S. Tsirkin, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Jan Kiszka, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Isaku Yamahata, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Michael S. Tsirkin, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Jan Kiszka, 2011/07/20
- Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Michael S. Tsirkin, 2011/07/20
Re: [Qemu-devel] [PATCH] pci: Length-align config space accesses, Michael S. Tsirkin, 2011/07/20