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Re: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks

To: "Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Wed, 5 Oct 2005 22:46:45 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "Koren, Bradley J" <Bradley.Koren@xxxxxxxxxx>, "Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx>, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx>
Delivery-date: Wed, 05 Oct 2005 21:52:50 +0000
List-id: Xen developer discussion <xen-devel.lists.xensource.com>


On 5 Oct 2005, at 19:27, Puthiyaparambil, Aravindh wrote:

Does anyone know if there are other places where the "lock" prefix is
used with a cache misaligned address?

x86 systems are supposed to guarantee that LOCKed instructions accesstheir memory operand atomically, regardless of alignment (Vol 3 of theIntel reference manual). Your systems break this application-visibleguarantee?


 -- Keir


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