Re: [Xen-devel] [PATCH] hvmloader: Intel GPU passthrough, reverse OpRegion

[Jean Guyader <jean.guyader@xxxxxxxxxxxxx>]

On 23/11 05:20, Keir Fraser wrote:
> On 23/11/2011 16:07, "Jean Guyader" <jean.guyader@xxxxxxxxxxxxx> wrote:
> 
> > 
> > The Intel GPU uses a two pages NVS region called OpRegion.
> > In order to get full support for the driver in the guest
> > we need to map this region.
> > 
> > This patch reserves 2 pages on the top of the RAM and
> > mark this region as NVS in the e820. Then we write the
> > address to the config space (offset 0xfc) so the device
> > model can map the OpRegion at this address in the guest.
> 
> Please use mem_hole_alloc() rather than adjusting {low,high}_mem_pgend.
> 

I'm calling mem_hole_alloc() in pci_setup (see patch attached),
but that causes an overlap in e820, is that expected?

(XEN) HVM5: E820 table:
(XEN) HVM5:  [00]: 00000000:00000000 - 00000000:0009e000: RAM
(XEN) HVM5:  [01]: 00000000:0009e000 - 00000000:000a0000: RESERVED
(XEN) HVM5:  HOLE: 00000000:000a0000 - 00000000:000e0000
(XEN) HVM5:  [02]: 00000000:000e0000 - 00000000:00100000: RESERVED
(XEN) HVM5:  [03]: 00000000:00100000 - 00000000:3f800000: RAM
(XEN) HVM5:  HOLE: 00000000:3f800000 - 00000000:feff8000
(XEN) HVM5:  [04]: 00000000:feff8000 - 00000000:feffa000: NVS
(XEN) HVM5:  OVERLAP!!
(XEN) HVM5:  [05]: 00000000:fc000000 - 00000001:00000000: RESERVED

Jean

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