RE: Re: [Xen-devel] [PATCH] ept: Fix bug in changeset 22526:7a5ee3800417

[MaoXiaoyun <tinnycloud@xxxxxxxxxxx>]

 
So system doesn't use VTD is not affectted, right?
 
> Date: Wed, 16 Mar 2011 09:40:15 +0000
> From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
> Subject: Re: [Xen-devel] [PATCH] ept: Fix bug in changeset
> 22526:7a5ee3800417
> To: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
>
> At 15:41 +0000 on 15 Mar (1300203711), George Dunlap wrote:
> > This fixes a bug in changeset 22526:7a5ee3800417, where the wrong
> > value is read when deciding whether to flush the VTd tables. The
> > effect is minor: in situations where the p2m entry is changed but the
> > mfn is the same, the VTd tables will be unnecessarily flushed.
> >
> > old_entry is left untouched in the second case, since having a present
> > old_entry will cause the an unnecessary check to be taken at the end
> > of the function.
> >
> > Spotted-by: Zhang, Peng Fei <zpfalpc23@xxxxxxxxx>
> > Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
>
> Applied, thanks.
>
> Tim.
>
> --
> Tim Deegan <Tim.Deegan@xxxxxxxxxx>
> Principal Software Engineer, Xen Platform Team
> Citrix Systems UK Ltd. (Company #02937203, SL9 0BG)
>
>
>

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