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xen-devel
[Xen-devel] RE: [RFC] fix xen_in_range()
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To: |
Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] RE: [RFC] fix xen_in_range() |
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From: |
"Cihula, Joseph" <joseph.cihula@xxxxxxxxx> |
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Date: |
Thu, 23 Apr 2009 18:26:44 -0700 |
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Cc: |
"Cui, Dexuan" <dexuan.cui@xxxxxxxxx>, "Wang, Shane" <shane.wang@xxxxxxxxx>, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, "Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx>, "Ke, Liping" <liping.ke@xxxxxxxxx>, "Li, Xin" <xin.li@xxxxxxxxx> |
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Thu, 23 Apr 2009 18:27:14 -0700 |
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<C615D676.947F%keir.fraser@xxxxxxxxxxxxx> |
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AcnDpY3Rx9vYpAhLRJKuPa7HelNYvQAPx4L1ACJmXQA= |
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Thread-topic: |
[RFC] fix xen_in_range() |
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: Thursday, April 23, 2009 12:25 AM
>
> On 23/04/2009 00:53, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx> wrote:
>
> > Unfortunately, the frametable is only contiguous in the virtual address
> > space,
> > so one can't simply take __pa() of its start and end. And since it is quite
> > large, iterating through each page to gets its phys addr adds a perceptible
> > delay when that check has to be done for each page of physical memory (as is
> > the case in the only caller, the VT-d routine that maps memory for dom0).
> > But
> > it also appears that we can't convert the phys addr arguments into their
> > virt
> > addrs to compare with the contiguous frametable range because they will
> > convert to the DIRECTMAP va's instead.
>
> The frametable is allocated in aligned 2MB chunks. So you can check at that
> granularity rather than 4kB.
That made it just a single iteration on a 2GB system, but what fn should be
used to convert the va to pa? __pa() isn't converting this correctly.
Joe
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