Re: [Xen-devel] [PATCH] KVM: arm64: add workaround for Cortex-A57 erratum #852523

[Marc Zyngier <marc.zyngier@xxxxxxx>]

On 14/09/15 16:06, Will Deacon wrote:
> When restoring the system register state for an AArch32 guest at EL2,
> writes to DACR32_EL2 may not be correctly synchronised by Cortex-A57,
> which can lead to the guest effectively running with junk in the DACR
> and running into unexpected domain faults.
> 
> This patch works around the issue by re-ordering our restoration of the
> AArch32 register aliases so that they happen before the AArch64 system
> registers. Ensuring that the registers are restored in this order
> guarantees that they will be correctly synchronised by the core.
> 
> Cc: <stable@xxxxxxxxxxxxxxx>
> Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> Signed-off-by: Will Deacon <will.deacon@xxxxxxx>

Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>

I'll queue that together with the next batch of fixes.

Thanks,

        M.
-- 
Jazz is not dead. It just smells funny...

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