Re: [PATCH v6 18/64] KVM: arm64: nv: Trap EL1 VM register accesses in virtual EL2

Russell King (Oracle)
2022-02-01T18:10:34Z

On Fri, Jan 28, 2022 at 12:18:26PM +0000, Marc Zyngier wrote:
> From: Christoffer Dall <christoffer.dall@linaro.org>
>
> When running in virtual EL2 mode, we actually run the hardware in EL1
> and therefore have to use the EL1 registers to ensure correct operation.
>
> By setting the HCR.TVM and HCR.TVRM we ensure that the virtual EL2 mode
> doesn't shoot itself in the foot when setting up what it believes to be
> a different mode's system register state (for example when preparing to
> switch to a VM).
>
> We can leverage the existing sysregs infrastructure to support trapped
> accesses to these registers.
>
> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

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