Re: [Xen-devel] [PATCH for-4.12 6/8] xen/arm: Implement workaround for Cortex-A76 erratum 1165522

[Andrii Anisov <andrii.anisov@xxxxxxxxx>]

On 28.11.18 18:49, Julien Grall wrote:
> Early version of Cortex-A76 can end-up with corrupt TLBs if they
> speculate an AT instruction while the S1/S2 system registers are in an
> inconsistent state.
>
> This can happen during guest context switch and when invalidating the
> TLBs for other than the current VMID.
>
> The workaround implemented in Xen will:
>      - Use an empty stage-2 with a reserved VMID while context switching
>      between 2 guests
>      - Use an empty stage-2 with the VMID where TLBs need to be flushed
>
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Andrii Anisov <andrii_anisov@xxxxxxxx>

--
Sincerely,
Andrii Anisov.

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