Re: [PATCH] x86/mm: avoid playing with directmap when self-snoop can be relied upon

[Jan Beulich <jbeulich@xxxxxxxx>]

On 21.10.2020 17:23, Roger Pau Monné wrote:
> On Tue, Oct 20, 2020 at 03:51:18PM +0200, Jan Beulich wrote:
>> The set of systems affected by XSA-345 would have been smaller is we had
>> this in place already: When the processor is capable of dealing with
>> mismatched cacheability, there's no extra work we need to carry out.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Thanks.

> I guess it's not worth using the alternative framework to patch this
> up at boot in order to avoid the call in the first place?

It being non-trivial (afaict) in cases like this one makes me
think that the price to do so would be higher than the gain
to be had. But I might be wrong ...

Jan