Re: [xen-unstable test] 162845: regressions - FAIL

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Wed, Jun 16, 2021 at 04:49:33PM +0200, Jan Beulich wrote:
> I don't think it should. But I now notice I should have looked at the
> logs of these tests:
> 
> xc: info: Saving domain 2, type x86 HVM
> xc: error: Unable to obtain the guest p2m size (1 = Operation not permitted): 
> Internal error
> xc: error: Save failed (1 = Operation not permitted): Internal error
> 
> which looks suspiciously similar to the issue Jürgen's d21121685fac
> ("tools/libs/guest: fix save and restore of pv domains after 32-bit
> de-support") took care of, just that here we're dealing with a HVM
> guest. I'll have to go inspect what exactly the library is doing there,
> and hence where in Xen the -EPERM may be coming from all of the
> sudden (and only for OVMF).
> 
> Of course the behavior you describe above may play into this, since
> aiui this might lead to an excessively large p2m (depending what
> exactly you mean with "as high as possible").

The maximum physical address size as reported by cpuid 0x80000008
(or 1<<48 if above that) minus 1 page, or 1<<36 - 1 page.

-- 
Anthony PERARD