Re: [Xen-devel] [PATCH v2 05/19] xen/arm: Avoid setting/clearing HCR_RW at every context switch

[Julien Grall <julien.grall@xxxxxxx>]

Hi Wei,

On 30/03/17 10:13, Wei Chen wrote:
> The HCR_EL2 flags for 64-bit and 32-bit domains are different. But
> when we initialized the HCR_EL2 for vcpu0 of Dom0 and all vcpus of
> DomU in vcpu_initialise, we didn't know the domain's address size
> information. We had to use compatible flags to initialize HCR_EL2,
> and set HCR_RW for 64-bit domain or clear HCR_RW for 32-bit domain
> at every context switch.
>
> But, after we added the HCR_EL2 to vcpu's context, this behaviour
> seems a little fussy. We can update the HCR_RW bit in vcpu's context
> as soon as we get the domain's address size to avoid setting/clearing
> HCR_RW at every context switch.
>
> Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

--
Julien Grall

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