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xen: map foreign pages for shared rings by updating the PTEs directly

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When mapping a foreign page with xenbus_map_ring_valloc() with the
GNTTABOP_map_grant_ref hypercall, set the GNTMAP_contains_pte flag and
pass a pointer to the PTE (in init_mm).

After the page is mapped, the usual fault mechanism can be used to
update additional MMs.  This allows the vmalloc_sync_all() to be
removed from alloc_vm_area().

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
[v1: Squashed fix by Michal for no-mmu case]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
David Vrabel 2011-09-29 16:53:32 +01:00 • committed by Konrad Rzeszutek Wilk
parent 1ea6b8f489
commit cd12909cb5
5 changed files with 24 additions and 20 deletions
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2
include/linux/vmalloc.h
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@ -119,7 +119,7 @@ unmap_kernel_range(unsigned long addr, unsigned long size)
#endif
/* Allocate/destroy a 'vmalloc' VM area. */
extern struct vm_struct *alloc_vm_area(size_t size);
extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
extern void free_vm_area(struct vm_struct *area);
/* for /dev/kmem */