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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-03-26 15:37:50 -0700
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2010-07-27 11:50:41 -0400
commitd2cb214551de8180542a04ec8c86c0c9412c5124 (patch)
tree8c9cb83c2899cc765cf5789896b19383b6e8ddef /arch/x86/xen/mmu.c
parenta0d40c80256e31b23849f2ba781b74bf0218a1fa (diff)
downloadlinux-linaro-android-d2cb214551de8180542a04ec8c86c0c9412c5124.tar.gz
xen/mmu: inhibit vmap aliases rather than trying to clear them out
Rather than trying to deal with aliases once they appear, just completely inhibit them. Mostly the removal of aliases was managable, but it comes unstuck in xen_create_contiguous_region() because it gets executed at interrupt time (as a result of dma_alloc_coherent()), which causes all sorts of confusion in the vmap code, as it was never intended to be run in interrupt context. This has the unfortunate side effect of removing all the unmap batching the vmap code so carefully added, but that can't be helped. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/mmu.c')
-rw-r--r--arch/x86/xen/mmu.c10
1 files changed, 3 insertions, 7 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index eb51402dd99..ef5728dde8f 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -42,6 +42,7 @@
#include <linux/highmem.h>
#include <linux/debugfs.h>
#include <linux/bug.h>
+#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/gfp.h>
@@ -1015,8 +1016,6 @@ static int xen_pin_page(struct mm_struct *mm, struct page *page,
read-only, and can be pinned. */
static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
{
- vm_unmap_aliases();
-
xen_mc_batch();
if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
@@ -1580,7 +1579,6 @@ static void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn, unsigned l
if (PagePinned(virt_to_page(mm->pgd))) {
SetPagePinned(page);
- vm_unmap_aliases();
if (!PageHighMem(page)) {
make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
if (level == PT_PTE && USE_SPLIT_PTLOCKS)
@@ -2026,6 +2024,8 @@ void __init xen_init_mmu_ops(void)
x86_init.paging.pagetable_setup_start = xen_pagetable_setup_start;
x86_init.paging.pagetable_setup_done = xen_pagetable_setup_done;
pv_mmu_ops = xen_mmu_ops;
+
+ vmap_lazy_unmap = false;
}
/* Protected by xen_reservation_lock. */
@@ -2165,8 +2165,6 @@ int xen_create_contiguous_region(unsigned long vstart, unsigned int order,
memset((void *) vstart, 0, PAGE_SIZE << order);
- vm_unmap_aliases();
-
spin_lock_irqsave(&xen_reservation_lock, flags);
/* 1. Zap current PTEs, remembering MFNs. */
@@ -2204,8 +2202,6 @@ void xen_destroy_contiguous_region(unsigned long vstart, unsigned int order)
memset((void *) vstart, 0, PAGE_SIZE << order);
- vm_unmap_aliases();
-
spin_lock_irqsave(&xen_reservation_lock, flags);
/* 1. Find start MFN of contiguous extent. */