Re: [Xen-devel] BSS region in xen_in_range is incorrect

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

Allocate the static buffer in initdata, and always require to dynamically
allocate a replacement buffer during Xen boot. The latter allocation should
surely succeed since it happens so early.

Goodness knows why I applied that patch so late during 4.0.0 release cycle.

 -- Keir

On 22/04/2010 10:35, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote:

> In c/s 21038, console_init_postirq frees default static ring buffer if a
> dynamic one was obtained. This makes dom0 can use the default static ring
> buffer which is in BSS region, but xen_in_range didn't remove the region from
> BSS region which won't be mapped in VT-d page table, so it causes problems
> when a device DMAs to that region. To fix this issue, 1) remove the freed
> region from BSS region in xen_in_range; 2) don't free default static ring
> buffer. Method 1) can fix it cleanly, but maybe need many changes. Method 2)
> is simple, but it wastes some resources.
> 
> Keir / Jan, what's your opinion?
> 
> Regards,
> Weidong
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel



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