Re: [Xen-devel] [PATCH v4 4/7] x86/tlb: introduce a flush guests TLB flag

[Tim Deegan <tim@xxxxxxx>]

At 18:28 +0100 on 10 Feb (1581359306), Roger Pau Monne wrote:
> Introduce a specific flag to request a HVM guest TLB flush, which is
> an ASID/VPID tickle that forces a linear TLB flush for all HVM guests.
> 
> This was previously unconditionally done in each pre_flush call, but
> that's not required: HVM guests not using shadow don't require linear
> TLB flushes as Xen doesn't modify the guest page tables in that case
> (ie: when using HAP).
> 
> Modify all shadow code TLB flushes to also flush the guest TLB, in
> order to keep the previous behavior. I haven't looked at each specific
> shadow code TLB flush in order to figure out whether it actually
> requires a guest TLB flush or not, so there might be room for
> improvement in that regard.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> Reviewed-by: Wei Liu <wl@xxxxxxx>

Acked-by:  Tim Deegan <tim@xxxxxxx>

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