Re: [Xen-devel] [PATCH 18/21] xenpaging: prevent page-out of first 16MB

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 16.12.10 at 17:59, Olaf Hering <olaf@xxxxxxxxx> wrote:
> On Fri, Nov 26, Olaf Hering wrote:
> 
>> This is more a workaround than a bugfix:
>> Don't page out first 16MB of memory.
>> When the BIOS does its initialization process and xenpaging removes pages,
>> crashes will occour due to lack of support of xenpaging.
> 
> While looking at this again, I came up with this change. Any idea whats
> at 512K during BIOS startup?
> 
> 
>  Subject: xenpaging: prevent page-out of gfn 0x80
> 
> Add a workaround for missing handling of paged-out pages during BIOS 
> startup.
> For some reason, only gfn 0x80 is affected.
> 
> (XEN) HVM3: HVM Loader
> (XEN) traps.c:649:d3 Bad GMFN 80 (MFN ffffffffff) to MSR 40000000

This clearly is another place where page-in needs to be triggered.
Isn't it the case that *any* gmfn_to_mfn() needs this special
treatment? Couldn't therefore the translation function itself deal
with requesting the page-in (and waiting for its completion, now
that this can be done)?

Jan


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