Re: Corrupt data when reading filesystems under Linux guest

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Jun 10, 2005 at 06:59:14AM +0000, Jed Davis wrote:
> In article <1118281429.532953.2723.nullmailer%yamt.dyndns.org@localhost>,
> YAMAMOTO Takashi  <yamt%mwd.biglobe.ne.jp@localhost> wrote:
> > 
> > besides that, xen_shm assumes an arbitrary request can be mapped into
> > a single contiguous virtual address range.  it's wrong.
> 
> Also, it assumes that it will be mapping pages for only one xbd request
> at a time; see XENSHM_MAX_PAGES_PER_REQUEST.  That will need some
> adjusting if I want to piece together a whole MAXPHYS... and, while I'm
> in this file, I wonder: is xen_shm's big piece of VM actually big enough
> to handle use by both disk and net devices?

Yes, it should. And there is a callback mechanism to defer a request in
case of resource shortage at this level.

> 
> Oh, and: it's nice that the value of xen_shm_size is patchable, but
> won't the size of _xen_shm_vaddr2ma[] be a little harder to manipulate
> post-linking?

Sure, I didn't intend to have xen_shm_size patchable.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--