Re: [Xen-devel] [PATCH] qemu-xen-trad: free all the pirqs for msi/msix when driver unloads

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Aug 05, 2014 at 03:31:34PM +0800, Zhenzhong Duan wrote:
> 
> On 2014-8-4 22:01, Konrad Rzeszutek Wilk wrote:
> >On Tue, Jul 08, 2014 at 09:12:39AM +0800, Zhenzhong Duan wrote:
> >>On 2014-7-8 4:40, Konrad Rzeszutek Wilk wrote:
> >>>On Fri, Jul 04, 2014 at 09:29:38AM +0800, Zhenzhong Duan wrote:
> >>>>On 2014-7-4 1:54, Konrad Rzeszutek Wilk wrote:
> >>>>>On Thu, Jul 03, 2014 at 11:12:18AM +0800, Zhenzhong Duan wrote:
> >>>>>>There is a patch dependency missed.
> >>>>>Is that one upstream as well? Or does it not need to be?
> >>>>>If it is upstream, what is the title/commit id of that one?
> >>>>>
> >>>>>Thank you!
> >>>>It's upstream, see detail below
> >>>[konrad@build-external qemu-xen-dir]$ pwd
> >>>/home/konrad/xtt-x86_64/xen/tools/qemu-xen-dir
> >>>[konrad@build-external qemu-xen-dir]$ git show 
> >>>adf74189dd58014744a4b8c9d64407d629da5e2f
> >>>fatal: bad object adf74189dd58014744a4b8c9d64407d629da5e2f
> >>>[konrad@build-external qemu-xen-dir]$ git log --grep="clear all MSI"
> >>>[konrad@build-external qemu-xen-dir]$
> >>>
> >>>?
> >>Sorry, I mean qemu-xen-traditional upstream git
> >Ok, is that patch upstream? Should it be upstream? If so, had it been
> >posted in the past?
> It's already in qemu-xen upstream, see below
> 
> void xen_pt_msi_disable(XenPCIPassthroughState *s)
> {
> .......
>     /* clear msi info */
>     msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
>     msi->initialized = false;
>     msi->mapped = false;
>     msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
> }

OK, and that is part of the giant '3854ca57':

commit 3854ca577dad92c4fe97b4a6ebce360e25407af7
Author: Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
Date:   Thu Jun 21 15:42:35 2012 +0000

    Introduce Xen PCI Passthrough, MSI
    
    A more complete history can be found here:
    git://xenbits.xensource.com/qemu-xen-unstable.git
    
    Signed-off-by: Jiang Yunhong <yunhong.jiang@xxxxxxxxx>
    Signed-off-by: Shan Haitao <haitao.shan@xxxxxxxxx>
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

And the git tree it points to has tons of tags but nothing
really saying 'pci'. <sigh>

Seems like the only option is to spin out a tiny patch
that has the fix and document where it was (aka point to the
giant commit). 

Duan, I can do it in two-three weeks time-frame. If you want
to take a stab at it before then, don't hesitate!

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