linux-kernel - Re: [PATCH] PCI: hv: Detect and fix Hyper-V PCI domain number collision

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Message-ID: <20190806185531.GS151852@google.com>
Date:   Tue, 6 Aug 2019 13:55:31 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Haiyang Zhang <haiyangz@...rosoft.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>, vkuznets <vkuznets@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: hv: Detect and fix Hyper-V PCI domain number
 collision

On Mon, Aug 05, 2019 at 02:36:57PM -0400, Sasha Levin wrote:
> On Fri, Aug 02, 2019 at 06:52:56PM +0000, Haiyang Zhang wrote:
> > Due to Azure host agent settings, the device instance ID's bytes 8 and 9
> > are no longer unique. This causes some of the PCI devices not showing up
> > in VMs with multiple passthrough devices, such as GPUs. So, as recommended
> > by Azure host team, we now use the bytes 4 and 5 which usually provide
> > unique numbers.
> > 
> > In the rare cases of collision, we will detect and find another number
> > that is not in use.
> > Thanks to Michael Kelley <mikelley@...rosoft.com> for proposing this idea.

> > Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> 
> Acked-by: Sasha Levin <sashal@...nel.org>
> 
> Bjorn, will you take it through the PCI tree or do you want me to take
> it through hyper-v?

Lorenzo usually applies patches to drivers/pci/controller/*, so that
would be my preference.

Bjorn