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

[Juergen Gross <jgross@xxxxxxxx>]

On 28/02/18 12:52, Jan Beulich wrote:
>>>> On 07.02.18 at 17:05, <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
> 
> I've updated this one to patch all paths, but I'd like to avoid sending
> v3 of the series without having had any feedback on v2 (leaving
> aside a tiny bit on patch 1).
> 
> Jan
> 
>> 5: avoid double CR3 reload when switching to guest user mode
>> 6: disable XPTI when RDCL_NO
>> 7: x86: log XPTI enabled status
>>
>> I won't mind if it was decided for some of them to be pointless, but I
>> think 1 (because of a measurable improvement of 1-3%), 4 (helping
>> the "xpti=no" case, even if only a little; taking 3 as prereq), and
>> 6+7 should be considered seriously.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

You can add to all of them:

Tested-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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