From: Julien Grall <julien.grall@linaro.org>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: xen-devel@lists.xenproject.org, Tim Deegan <tim@xen.org>,
stefano.stabellini@citrix.com
Subject: Re: [PATCH 1/3] xen/arm: Move p2m context save/restore in a separate function
Date: Fri, 28 Mar 2014 12:44:05 +0000 [thread overview]
Message-ID: <53356E95.2080103@linaro.org> (raw)
In-Reply-To: <1395393567.3104.46.camel@kazak.uk.xensource.com>
Hi Ian,
On 03/21/2014 09:19 AM, Ian Campbell wrote:
> On Thu, 2014-03-20 at 17:59 +0000, Julien Grall wrote:
>
>>> Are all of these isb()s necessary? I guess this is only code motion,
>>> so in any case, Acked-by: Tim Deegan <tim@xen.org> (for the whole series)
>>> but it seems like at least the one after the VTTBR write could go?
>>
>> Thanks for the review.
>>
>> Yes, the isb() right after VTBBR can be removed.
>
> Actually I think there are probably loads of barriers in the context
> switch path which can be dropped in favour of a final one at the end,
> not all that much stuff there relies on stuff which is reloaded before
> it (of course we should keep barriers for cases where there is a
> dependence).
Sorry for the late answer. Shall I rework this patch and remove the
duplicated isb and HCR_VM?
Regards,
--
Julien Grall
next prev parent reply other threads:[~2014-03-28 12:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-19 15:43 [PATCH 0/3] xen/arm: setup a sane EL1 state while building domain 0 Julien Grall
2014-03-19 15:43 ` [PATCH 1/3] xen/arm: Move p2m context save/restore in a separate function Julien Grall
2014-03-20 17:23 ` Tim Deegan
2014-03-20 17:59 ` Julien Grall
2014-03-21 9:19 ` Ian Campbell
2014-03-28 12:44 ` Julien Grall [this message]
2014-03-28 12:47 ` Ian Campbell
2014-03-28 13:23 ` Julien Grall
2014-04-01 10:53 ` Ian Campbell
2014-03-21 16:52 ` Ian Campbell
2014-03-19 15:43 ` [PATCH 2/3] xen/arm: Use p2m_restore_state in construct_dom0 Julien Grall
2014-03-21 16:50 ` Ian Campbell
2014-03-28 13:26 ` Julien Grall
2014-03-28 13:51 ` Ian Campbell
2014-03-19 15:43 ` [PATCH 3/3] xen/arm: Don't need to export p2m_load_VTTBR Julien Grall
2014-03-21 16:52 ` Ian Campbell
2014-04-01 10:53 ` [PATCH 0/3] xen/arm: setup a sane EL1 state while building domain 0 Ian Campbell
2014-04-01 11:33 ` Fu Wei
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