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[Xen-devel] Re: Illegal PV kernel pfm/pfn translations on PROT_NONE iore
| To: | "Stephen C. Tweedie" <sct@xxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: Illegal PV kernel pfm/pfn translations on PROT_NONE ioremaps |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 20 Mar 2008 11:39:26 +0000 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx> |
| Delivery-date: | Thu, 20 Mar 2008 04:41:03 -0700 |
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| In-reply-to: | <C407115D.1E26E%keir.fraser@xxxxxxxxxxxxx> |
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| Thread-topic: | Illegal PV kernel pfm/pfn translations on PROT_NONE ioremaps |
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On 19/3/08 18:52, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote: >> Yep. There are a number of bits that could be used: for example, I >> don't think PROT_WRITE is ever going to be set on a PROT_NONE page, >> either. > > My point is the flag would be set even when the protection is not PROT_NONE. > It has other uses beyond fixing this bug. > > I might look into doing this myself as I think it is probably the best fix for > this issue. ...and the issue is now fixed (changeset 488) in http://xenbits.xensource.com/staging/linux-2.6.18-xen.hg The patch is a minimal one given the approach of using a new _PAGE_IO flag. For example, pte_pfn() probably no longer needs to use mfn_to_local_pfn() and could use the simpler and faster mfn_to_pfn() instead. But that belongs in a separate patch. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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