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Re: [Xen-devel] [PATCH] xen vtd : set msi guest_masked 0 by default

> From: Jan Beulich
> Sent: Tuesday, January 26, 2016 8:57 PM
> To: Chang Jianzhong
> Cc: andrew.cooper3@xxxxxxxxxx; keir@xxxxxxx; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH] xen vtd : set msi guest_masked 0 by default
> >>> On 26.01.16 at 02:34, <changjzh@xxxxxxxxx> wrote:
> > There are some problems when msi guest_masked is set to 1 by default.
> > When guest os is windows 2008 r2 server,
> > the device(eg X540-AT2 vf) is not initialized correctly.
> > Host will always receive message like this :"VF Reset msg received from vf".
> > Guest has network connectivity issues,
> > and can not correctly receive/send the packet.
> > So, guest_masked is set to 0 by default.
> You describe a problem and half of your change, but there's no
> connection between the two: What is actually wrong with current
> behavior (matching the hardware's - MSI-X mask bits are set when
> coming out of reset).

Agree. Jianzhong, could you elaborate how mask bit is related to
the error message above? Also instead of changing the behavior
completely, you need consider there must be a reason for 
guest_masked set to 1 originally. So when you fix one issue please
pay attention to not break other scenarios.


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