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Date: Tue, 09 Sep 2008 16:32:16 +0300 From: Avi Kivity <avi@...ranet.com> To: Jeremy Fitzhardinge <jeremy@...p.org> CC: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, Xen Devel <xen-devel@...ts.xensource.com>, Andi Kleen <andi@...stfloor.org> Subject: Re: [PATCH 1 of 7] x86: add _PAGE_IOMAP pte flag for IO mappings Jeremy Fitzhardinge wrote: > Use one of the software-defined PTE bits to indicate that a mapping is > intended for an IO address. On native hardware this is irrelevent, > since a physical address is a physical address. But in a virtual > environment, physical addresses are also virtualized, so there needs > to be some way to distinguish between pseudo-physical addresses and > actual hardware addresses; _PAGE_IOMAP indicates this intent. > > By default, __supported_pte_mask masks out _PAGE_IOMAP, so it doesn't > even appear in the final pagetable. > Could PTE_SPECIAL, added for get_user_pages_really_fast(), be reused for this? -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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