Re: [Xen-devel] [PATCH v7 01/12] x86/mm: allow a privileged PV domain to map guest mfns

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.09.17 at 16:22, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: 27 September 2017 14:31
>> >>> On 27.09.17 at 14:49, <Paul.Durrant@xxxxxxxxxx> wrote:
>> > Ok, I'll claim the final cmd value then.
>> 
>> Final? We've got 5 left (for a total of 3 bits) afaict.
> 
> Really? Maybe I misread... looks like only 2 bits to me.

Maybe you and I looked in different places. I'm deriving this from

        cmd = req.ptr & (sizeof(l1_pgentry_t)-1);

        switch ( cmd )

in do_mmu_update(). Only 32-bit non-PAE guests would have been
limited to 2 bits.

Jan


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