Re: [Xen-devel] [PATCH v6 24/29] xen/x86: allow HVM guests to use hypercalls to bring up vCPUs

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 29/09/15 11:33, Jan Beulich wrote:
>>>> On 29.09.15 at 12:25, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 29/09/15 11:07, Jan Beulich wrote:
>>>>>> On 29.09.15 at 12:00, <andrew.cooper3@xxxxxxxxxx> wrote:
>>>> Therefore, we are back to the question of whether to provide all segment
>>>> registers, or specify a flat layout without specific selector values.  I
>>>> would prefer the former to the latter.
>>> If we don't go the CS+SS only route, then yes, I'd too prefer
>>> completing the set (I would probably agree with not adding FS
>>> and GS, and even recommend against it in the 64-bit variant,
>>> but I do insist on ES in that case).
>> I would still err on the CS/SS/DS/ES side given a straight choice.  It
>> offers more flexibility for rarer usecases.
> Okay, all four of them then for 32-bit, and just CS and SS for 64-bit?

Is SS needed for 64bit?  It is expected to be NUL just like DS and ES.

~Andrew

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel