Re: [Xen-devel] [PATCH 2/5] [RESEND] changes of common files for xen/ia64 dom0 vp model: privcmd_mmap

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Fri, Apr 28, 2006 at 02:43:58PM +0100, Keir Fraser wrote:
> 
> On 28 Apr 2006, at 03:52, Isaku Yamahata wrote:
> 
> >introduce xen_arch_privcmd_mmap() to allow xen/ia64 to override 
> >privcmd_mmap()
> >later.
> >xen/ia64 with dom0 vp model also needs direct_remap_pfn_range() to be 
> >called
> >for IOCTL_PRIVCMD_MMAPBATCH.
> >These changes are necessary for xen/ia64 with dom0 vp model.
> 
> Can you describe the use of xen_arch_privcmd_mmap() for ia64? I checked 
> in the other hunks of this patch, but excluded the 
> xen_arch_privcmd_mmap bits for now -- they can go in a separate patch.

It sets its own vma->vm_ops to track mmap/munmap.
When the region is completely unmapped, pages of a foreign domain
are zapped from dom0.

I attached the patch which implements it.
(HYPERVISOR_add_physmap(), HYPERVISOR_zap_physmap() are ia64 specific
hypercalls.)
It can't be applied to xen-unstable.hg nor xen-ia64-unstable.hg
cleanly because it is one of the series patches which is being merged.
The patch will be merged into xen-ia64-unstable.hg in the near future.
(At least I hope so)
I think it can be simplified using PageForeign() and its families.
When I wrote it I did't want to use PG_foreign bit.

-- 
yamahata

9780:ffd79e3ceeda_privcmd_direct_remap_pfn_range_linux.patch
Description: Text document

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