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

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Message-ID: <20190805183657.GD17747@sasha-vm>
Date:   Mon, 5 Aug 2019 14:36:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     "bhelgaas@...gle.com" <bhelgaas@...gle.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 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?

--
Thanks,
Sasha