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xen-devel
[Xen-devel] [PATCH] Assert that the p2m lock is held in ept_sync_domain
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To: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] [PATCH] Assert that the p2m lock is held in ept_sync_domain |
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From: |
George Dunlap <George.Dunlap@xxxxxxxxxxxxx> |
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Date: |
Tue, 22 Sep 2009 13:44:54 +0100 |
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Cc: |
Xiaohui Xin <Xiaohui.xin@xxxxxxxxx>, Xin Li <xin.b.li@xxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Tue, 22 Sep 2009 05:45:54 -0700 |
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Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
On Tue, Sep 22, 2009 at 10:17 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> On 22/09/2009 10:02, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
>
>>> Please see what you think of xen-unstable:20244.
>>
>> With no assertion in ept_sync_domain() on any locks held, is it guaranteed
>> that the function cannot be entered twice at the same time for a given
>> guest? If not, passing a pointer to the new ept_synced member isn't any
>> better than passing the one to domain_dirty_cpumask.
>
> I assume George is knowledgeable on that area. If calls to ept_sync_domain()
> are not serialised then I think synchronisation around the
> ept_needs_flush/ept_synced cpumask is indeed pretty suspect. If there isn't
> such a serialising lock, we could add one to ept_sync_domain() quite safely.
>
> -- Keir
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
assert-p2m-locked-in-ept-sync-domain.diff
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