[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] BSS region in xen_in_range is incorrect
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
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