[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 1/2][VTD] pci mmconfig support to be usedfor ATS
>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 20.11.08 21:20 >>> >On 20/11/08 20:10, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote: > >>> If this is x86-64 only anyway, why do you need to use fixmap >>> space for this (and limit things arbitrarily to 4 segments) >>> rather than using a 256Mb block from one of the unused virtual >>> address regions in hypervisor space? >> >> Can you point me how to use unused virtual address region to do ioremap >> without using fixmap? Is there a existing code that is already doing this? > >Pick yourself a nice piece of virtual address space (see the layout in >include/asm-x86/config.h -- 0xffff840000000000 would be fine) and then use >map_pages_to_xen(). While it can be adjusted later anyway, I'd suggest not using a part of this largest available range - sooner or later we'll want to use this to extend the 1:1 mapping to 4Tb. Instead, I'd pick another 1Gb range out of the 461Gb reserved region. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |