Re: [Xen-devel] [PATCH v2 0/7] x86: Meltdown band-aid overhead reduction

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.02.18 at 19:39, <persaur@xxxxxxxxx> wrote:
> On Feb 7, 2018, at 11:05, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>> 
>> 1: slightly reduce Meltdown band-aid overhead
>> 2: remove CR reads from exit-to-guest path
>> 3: introduce altinstruction_nop assembler macro
>> 4: NOP out most XPTI entry/exit code when it's not in use
>> 5: avoid double CR3 reload when switching to guest user mode
>> 6: disable XPTI when RDCL_NO
>> 7: x86: log XPTI enabled status
> 
> Since work on XPTI is ongoing, will these improvements to XPTI-stage-1 be 
> published via http://xenbits.xen.org/xsa/xsa254/README.pti? 

They first of all need to go in (or whatever sub-portion of it is
deemed acceptable). And then I'm not sure we should further
clutter the XSA with performance improvements - I'd be
inclined to add further commits to the list only if we find issues
with the current approach.

Jan


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