Re: [Xen-devel] [PATCH v5 0/4] x86: modify_ldt improvement, test, and config option

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 07/30/2015 12:12 PM, Andrew Cooper wrote:
> On 30/07/15 17:05, Borislav Petkov wrote:
> > On Thu, Jul 30, 2015 at 11:53:34AM -0400, Boris Ostrovsky wrote:
> > > As far as Xen guests are concerned,
> > >
> > > Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> > Does that mean, this patch 1/4 fixes the 32bit issue you guys are still
> > debugging on the v4 thread? Or does that need more fixing?
> I was going to say... This v5 pre-dates figuring out what was wrong with
> 32bit Xen.  v5 1/4 is still susceptible.
>
> Boris: does your Tested-by cover v5 + proposed fix?
Only V5, no extra changes.

And perhaps dropping aliases in xen_alloc_ldt() may be sufficient since 
with that done we will only have one mapping so a subsequent fault will 
have "correct" cr2 provided by the hypervisor (from your earlier email 
it sounded that hypervisor may have been providing incorrect cr2 if 
alias exists)
-boris

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