Re: [Xen-devel] [PATCH] AMD IOMMU: Defer IO pagetable construction until device assignment

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 2/4/08 15:13, "Wei Wang2" <wei.wang2@xxxxxxx> wrote:

> During HVM domain creation, I/O page tables are filled by coping p2m
> entries from p2m table, which is a useless step for non-passthru domain.
> This patch defers I/O page table construction until the moment of device
> assignment. In case that pci devices are never assigned or hot plugged,
> the unnecessary duplication will be avoid.

You can't duplicate p2m_lock() and p2m_unlock(). Why do you need to protect
your new function with that lock anyway?

 -- Keir



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