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Re: [PATCH v3 04/39] xen/riscv: request a G-stage flush on vmenter when VMIDs are disabled
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
- Date: Mon, 05 Oct 2026 12:01:55 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Romain Caritey <Romain.Caritey@xxxxxxxxxxxxx>, Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>, Zheng Zhang <zhangzheng@xxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
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On Wed, 30 Sep 2026 18:18:46 +0200, Oleksii Kurochko
<oleksii.kurochko@xxxxxxxxx> wrote:
> vmid_handle_vmenter() reports that no flush is needed when VMIDs are
> unavailable (e.g. vmid=off, or hardware with no more than one VMID bit).
> Every domain then runs under VMID 0 with nothing flushed in between, so as
> soon as a hart runs more than one domain, a domain entered there can use
> the G-stage translations left behind by the domain which ran before it.
>
> Report that a flush is needed on every entry instead.
>
> [...]
Reviewed-by: Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
--
Baptiste Le Duc <baptiste.le-duc@xxxxxxxxxx>
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