Re: [PATCH] x86/svm: Use flush-by-asid when available

[Jan Beulich <jbeulich@xxxxxxxx>]

On 05.05.2020 20:25, Andrew Cooper wrote:
> AMD Fam15h processors introduced the flush-by-asid feature, for more fine
> grain flushing purposes.
> 
> Flushing everything including ASID 0 (i.e. Xen context) is an an unnecesserily
> large hammer, and never necessary in the context of guest TLBs needing
> invalidating.
> 
> When available, use TLB_CTRL_FLUSH_ASID in preference to TLB_CTRL_FLUSH_ALL.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>