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xen-devel
RE: [Xen-devel] [PATCH] [VTD] Remove PCI device enumeration for dom0 in
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To: |
"Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "Espen Skoglund" <espen.skoglund@xxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] [PATCH] [VTD] Remove PCI device enumeration for dom0 in Xen |
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From: |
"Han, Weidong" <weidong.han@xxxxxxxxx> |
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Date: |
Wed, 22 Oct 2008 21:15:13 +0800 |
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Cc: |
"Zhao, Yu" <yu.zhao@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> |
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Wed, 22 Oct 2008 06:15:39 -0700 |
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Thread-topic: |
[Xen-devel] [PATCH] [VTD] Remove PCI device enumeration for dom0 in Xen |
Keir Fraser wrote:
> On 22/10/08 13:38, "Espen Skoglund" <espen.skoglund@xxxxxxxxxxxxx>
> wrote:
>
>>> Xen 3.3 should continue to work with older dom0 kernels. However,
>>> now that iommu is *disabled* by default, will this mean that it
>>> would continue to work with older dom0 kernels so long as iommu is
>>> not enabled on the Xen command line? This should be tested and
>>> confirmed with this patch applied. If so, I would accept it.
>>
>> Users of pci_lock_pdev() and pci_lock_domain_pdev() would not be able
>> to find the PCI device unless it has been registered by dom0. Apart
>> from the iommu code, the only user affected would be the MSI code
>> which looks up the PCI device before enabling MSIs on it. As such,
>> you would not be able to enable MSIs if you have an old dom0 kernel.
>
> Is there any disadvantage to keeping this legacy code in Xen, apart
> from it annoyingly sitting there?
>
At present, I don't see any other disadvantage on functionality, apart
from it annoyingly sitting there and it allocates two pdev for the same
bdf.
Regards,
Weidong
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