Re: [Xen-devel] [PATCH v2 1/2] x86: Meltdown band-aid against malicious 64-bit PV guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.01.18 at 19:23, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 15/01/18 11:06, Jan Beulich wrote:
>> This also wants Andrew's "[PATCH RFC 11/44] x86/pt-shadow: Always set
>> _PAGE_ACCESSED on L4e updates".
> 
> I've cleaned this patch up and committed it in preparation.
> 
> http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=bd61fe94bee0556bc2f6 
> 4999a4a8315b93f90f21

Only now that I'm doing backports thereof I notice an oddity with
32-bit guest handling: Why would you set the accessed bit in that
case? The L4 is an internal thing there, and hence by us knowing
that we don't care, this is unnecessary (but of course also not
wrong). I'll do the 4.9 and older backports according to that
observation (making for slightly less of a code change).

Jan


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