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authorDavid Vrabel <david.vrabel@citrix.com>2011-09-29 16:53:32 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-11-16 12:13:08 -0500
commitcd12909cb576d37311fe35868780e82d5007d0c8 (patch)
tree70ec60af4feb32087f542a838fe4dce8717f0cd6 /arch/x86/xen
parent1ea6b8f48918282bdca0b32a34095504ee65bab5 (diff)
xen: map foreign pages for shared rings by updating the PTEs directly
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>
Diffstat (limited to 'arch/x86/xen')
-rw-r--r--arch/x86/xen/grant-table.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
index 6bbfd7ac5e8..5a40d24ba33 100644
--- a/arch/x86/xen/grant-table.c
+++ b/arch/x86/xen/grant-table.c
@@ -71,7 +71,7 @@ int arch_gnttab_map_shared(unsigned long *frames, unsigned long nr_gframes,
if (shared == NULL) {
struct vm_struct *area =
- alloc_vm_area(PAGE_SIZE * max_nr_gframes);
+ alloc_vm_area(PAGE_SIZE * max_nr_gframes, NULL);
BUG_ON(area == NULL);
shared = area->addr;
*__shared = shared;