Re: [Xen-devel] bug, bad page free with hvm guest after commits about AMD IOMMU

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 14:31 +0100 on 05 May (1304605909), Anthony PERARD wrote:
> Hi,
> 
> With the last xen-unstable, when I try to run a HVM guest, the vgabios
> did not display anything on the screen (it is only white), and Xen
> print this:

Interesting.  I get those messages but the BIOS continues OK so I hadn't
been in a hurry to investigate.  I'll take a look. 

Tim.

> (XEN) mm.c:2137:d0 Error pfn 0: rd=ffff83023e8a0000,
> od=ffff83022f5f3000, caf=8000000000000001, taf=7400000000000001
> (XEN) memory.c:196:d0 Bad page free for domain 24
> (XEN) mm.c:2137:d0 Error pfn 0: rd=ffff83023e8a0000,
> od=ffff83022f5f3000, caf=8000000000000001, taf=7400000000000001
> (XEN) memory.c:196:d0 Bad page free for domain 24
> ...
> 
> I found the issue come from one of this commits:
> 5cd3681 x86/mm: Add a generic interface for vtd and amd iommu p2m
> sharing. Also introduce a new parameter (iommu=sharept) to enable this
> 6b3faa6 x86/mm: Implement p2m table sharing for AMD IOMMU.
> 8d771f6 x86/mm: add AMD IOMMU control bits to p2m entries.
> 2452ae6 x86/mm: Move p2m type into bits of the PTE that the IOMMU doesn't use.
> 
> This happened on two machines:
> Intel(R) Core(TM) i7 CPU       M 620  @ 2.67GHz
> Intel(R) Xeon(R) CPU           X3450  @ 2.67GHz
> 
> -- 
> Anthony PERARD
> 
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-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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