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Re: [Xen-devel] [PATCH v5 08/15] xen: arm: drop cache maintenance by set/way trap handling

To: Ian Campbell <ian.campbell@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxx
From: Julien Grall <julien.grall@xxxxxxxxxx>
Date: Mon, 30 Mar 2015 13:28:41 +0100
Cc: tim@xxxxxxx, stefano.stabellini@xxxxxxxxxxxxx
Delivery-date: Mon, 30 Mar 2015 12:29:12 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

Hi Ian,

On 30/03/15 12:12, Ian Campbell wrote:
> We do not set HCR_EL2.TSW so we will never see these.
> 
> This is undoubtedly wrong, but for now remove the dead code.

Would it be better to trap and ignore them?

Even though it wouldn't be entirely correct, it would be better than
letting the guest using it.

Regards,

-- 
Julien Grall

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Follow-Ups:
- Re: [Xen-devel] [PATCH v5 08/15] xen: arm: drop cache maintenance by set/way trap handling
  - From: Ian Campbell

References:
- [Xen-devel] [PATCH v5 0/15] xen: arm: reenable support for 32-bit userspace running in 64-bit guest.
  - From: Ian Campbell

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