Re: [Xen-devel] [PATCH 8/8] x86: remove the Xen-specific _PAGE_IOMAP PTE flag

["H. Peter Anvin" <hpa@xxxxxxxxx>]

On 02/24/2014 09:39 AM, David Vrabel wrote:
> From: David Vrabel <david.vrabel@xxxxxxxxxx>
> 
> The _PAGE_IO_MAP PTE flag was only used by Xen PV guests to mark PTEs
> that were used to map I/O regions that are 1:1 in the p2m.  This
> allowed Xen to obtain the correct PFN when converting the MFNs read
> from a PTE back to their PFN.
> 
> Xen guests no longer use _PAGE_IOMAP for this. Instead mfn_to_pfn()
> returns the correct PFN by using a combination of the m2p and p2m to
> determine if an MFN corresponds to a 1:1 mapping in the the p2m.
> 
> Remove _PAGE_IOMAP, replacing it with _PAGE_UNUSED2 to allow for
> future uses of the PTE flag.
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: x86@xxxxxxxxxx
> --
> This depends on the preceeding Xen changes, so I think it would be
> best if this was acked by an x86 maintainer and merged via the Xen
> tree.

Acked-by: H. Peter Anvin <hpa@xxxxxxxxx>

Yay, a bit back!

        -hpa



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