Re: [Xen-devel] "Iomem mapping not permitted" during windows crash dump under GPLPV

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

James Harper wrote:
> > Keir Fraser wrote:
> > > On 30/01/2010 08:30, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
> wrote:
> > > > So there is definitely nothing I could tell Xen to do with a DomU
> PFN
> > > > that would remove the p2m mapping?
> > > If you balloon out a page, that would do it.
> > Yes, it certainly would and I've seen it many times. I'm fairly sure
> > that by just ignoring the failed block writes coming back from
> > blkback/tap and carrying on you still end up with a usable MEMORY.DMP
> > after reboot.
> Yes, that works. I still eye the error messages with contempt though :)
If you wanted to be clean, I guess you could check the data buffer addr 
passed to you by Windows against a map of ballooned out pages and 
substitute a dummy buffer in this case... but then you have the 
'interesting' problem of making the dump driver aware of that map.
  Paul

--
===============================
Paul Durrant, Software Engineer

Citrix Systems (R&D) Ltd.
First Floor, Building 101
Cambridge Science Park
Milton Road
Cambridge CB4 0FY
United Kingdom
===============================

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel