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From: Vadim Rozenfeld <vrozenfe@redhat.com>
Date: Thu, 08 Jan 2015 20:01:24 +1100
In-Reply-To: <54AE4295.7040109@huawei.com>
References: <54AE4253.2090206@huawei.com> <54AE4295.7040109@huawei.com>
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Subject: Re: [Qemu-devel] Fwd: [question] About MSI for vioscsi
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To: "Wangting (Kathy)" <kathy.wangting@huawei.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

On Thu, 2015-01-08 at 16:40 +0800, Wangting (Kathy) wrote:
> Hi Vadim,
> 
>    In order to enable MSI for vioscsi in virtio-win-0.1-74, I try to merge
> 
> the patch about Bug 1077566 into it, but I find that MSI still doesn't work,
> 
> because the value of IRQ is not negative in the device manager.
> 
>    I try to trace the I/O path with ENABLE_COM_DEBUG, and I find that
> 
> pMsixCapOffset->MessageControl.MSIXEnable is zero when
> 
> StorPortGetBusData returned in VioScsiFindAdapter, so MSI can't be enabled.
> 
>    I have tested that MSI is successfully enabled in virtio-win-0.1-81.
> 
> But I still want to find out why the patch is not work in virtio-win-0.1-74.
> 
> Is there some important points I missed?

Did you enable MSISupported in inf file?

Cheers,
Vadim.

> 
>    Thank you very much.
> 
>    Best wishes,
> 
>    Ting Wang
> 
> 
> 
> 
> 
> 
> 
>