On Fri, 06 Oct 2023 10:35:57 +0100, Oliver Upton <oliver.upton@xxxxxxxxx> wrote: > > Unlike nVHE, there is no need to switch the stage-2 MMU around on guest > entry/exit in VHE mode as the host is running at EL2. Despite this KVM > reloads the stage-2 on every guest entry, which is needless. > > This series moves the setup of the stage-2 MMU context to vcpu_load() > when running in VHE mode. This is likely to be a win across the board, > but also allows us to remove an ISB on the guest entry path for systems > with one of the speculative AT errata. > > None of my machines affected by the AT errata are VHE-capable, so it'd > be appreciated if someone could give this series a go and make sure I > haven't wrecked anything. It totally breaks on my A55 board. Running a single guest seems OK, but running a number of the concurrently makes them explode early on (faults in EFI...) I guess we end-up running with the wrong VTTBR at times, which would be interesting... M. -- Without deviation from the norm, progress is not possible.
