[PATCH v4 17/40] KVM: arm64: Move userspace system registers into separate function

Marc Zyngier marc.zyngier at arm.com
Wed Feb 21 04:21:11 PST 2018

On Thu, 15 Feb 2018 21:03:09 +0000,
Christoffer Dall wrote:
> There's a semantic difference between the EL1 registers that control
> operation of a kernel running in EL1 and EL1 registers that only control
> userspace execution in EL0.  Since we can defer saving/restoring the
> latter, move them into their own function.
> ACTLR_EL1 is not used by a VHE host, so we can move this register into
> the EL1 state which is not saved/restored for a VHE host.

Nit: maybe worth adding a reference to the D10.2.1 comment in the
ARMv8 ARM that indicates the "recommended" behaviour of this register?

> We also take this chance to rename the function saving/restoring the
> remaining system register to make it clear this function deals with
> the EL1 system registers.
> Reviewed-by: Andrew Jones <drjones at redhat.com>
> Signed-off-by: Christoffer Dall <christoffer.dall at linaro.org>

Reviewed-by: Marc Zyngier <marc.zyngier at arm.com>


Jazz is not dead, it just smell funny.

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