linux-kernel - Re: [PATCH v2] pci: fix device presence detection for VFs

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Date:   Mon, 7 Nov 2022 23:06:58 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Wei Gong <gongwei833x@...il.com>, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2] pci: fix device presence detection for VFs

On Mon, Nov 07, 2022 at 11:58:21PM -0500, Michael S. Tsirkin wrote:
> On Tue, Nov 08, 2022 at 04:52:16AM +0000, Wei Gong wrote:
> > O Wed, Oct 26, 2022 at 02:11:21AM -0400, Michael S. Tsirkin wrote:
> > > virtio uses the same driver for VFs and PFs.  Accordingly,
> > > pci_device_is_present is used to detect device presence. This function
> > > isn't currently working properly for VFs since it attempts reading
> > > device and vendor ID. As VFs are present if and only if PF is present,
> > > just return the value for that device.
> > > 
> > > Reported-by: Wei Gong <gongwei833x@...il.com>
> > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > ---
> > > 
> > > Wei Gong, thanks for your testing of the RFC!
> > > As I made a small change, would appreciate re-testing.
> > > 
> > > Thanks!
> > > 
> > > changes from RFC:
> > > 	use pci_physfn() wrapper to make the code build without PCI_IOV
> > > 
> > > 
> > >  drivers/pci/pci.c | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > 
> > Tested-by: Wei Gong <gongwei833x@...il.com>
> 
> 
> 
> Thanks!
> Bjorn, could you queue this fix in your tree or should I queue this
> in the virtio tree? I also think this would be nice to have for stable too -
> do you agree?
> Thanks!

It's on my list to look at, sorry for the delay.

Bjorn