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xen-devel
Re: [Xen-devel] [PATCH 0/5] Add MSI support to XEN
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To: |
"Shan, Haitao" <haitao.shan@xxxxxxxxx>, Neil Turton <nturton@xxxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH 0/5] Add MSI support to XEN |
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From: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Date: |
Thu, 03 Apr 2008 13:31:34 +0100 |
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Cc: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx>, "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> |
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Thu, 03 Apr 2008 05:33:43 -0700 |
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[Xen-devel] [PATCH 0/5] Add MSI support to XEN |
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On 3/4/08 13:11, "Shan, Haitao" <haitao.shan@xxxxxxxxx> wrote:
> Thanks for trying the patches. The problem is caused by incompatibility
> between Xen and Dom0 kernel.
> Pci_vector_resources is to calculate available vectors. Xen assigns vector by
> start with vector 0x20 and offset = 0. This will confuse the code in
> pci_vector_resources.
> Maybe we should replace the function with a hypercall to acquire the number of
> available vectors.
> How do you think about it, Keir?
I may not understand the issue here, but in principle I do not particularly
want to have anything outside Xen handling real IRQ vectors. In which case
this confusion should not exist in the first place? I know the last round of
patches did have dom0 poking the MSI registers, and hence it knew about real
vectors, but that's being changed in the next round, right?
-- Keir
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