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authorLinus Torvalds <torvalds@linux-foundation.org>2013-09-25 15:50:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-25 15:50:53 -0700
commit4b97280675f45c1650ee4e388bd711ecbb18c4b4 (patch)
tree45f9de3f355ac9245b9bda38e61204725cc7d991 /drivers/xen
parente93dd910b906d2bb881f334685eb03431fd3fa48 (diff)
parent15a3eac0784edb73cb2ec0f0c97705ba4bd39b3f (diff)
Merge tag 'stable/for-linus-3.12-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull Xen fixes from Konrad Rzeszutek Wilk: "Bug-fixes and one update to the kernel-paramters.txt documentation. - Fix PV spinlocks triggering jump_label code bug - Remove extraneous code in the tpm front driver - Fix ballooning out of pages when non-preemptible - Fix deadlock when using a 32-bit initial domain with large amount of memory - Add xen_nopvpsin parameter to the documentation" * tag 'stable/for-linus-3.12-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/spinlock: Document the xen_nopvspin parameter. xen/p2m: check MFN is in range before using the m2p table xen/balloon: don't alloc page while non-preemptible xen: Do not enable spinlocks before jump_label_init() has executed tpm: xen-tpmfront: Remove the locality sysfs attribute tpm: xen-tpmfront: Fix default durations
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/balloon.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index a50c6e3a7cc4..b232908a6192 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -398,8 +398,6 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
if (nr_pages > ARRAY_SIZE(frame_list))
nr_pages = ARRAY_SIZE(frame_list);
- scratch_page = get_balloon_scratch_page();
-
for (i = 0; i < nr_pages; i++) {
page = alloc_page(gfp);
if (page == NULL) {
@@ -413,6 +411,12 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
scrub_page(page);
+ /*
+ * Ballooned out frames are effectively replaced with
+ * a scratch frame. Ensure direct mappings and the
+ * p2m are consistent.
+ */
+ scratch_page = get_balloon_scratch_page();
#ifdef CONFIG_XEN_HAVE_PVMMU
if (xen_pv_domain() && !PageHighMem(page)) {
ret = HYPERVISOR_update_va_mapping(
@@ -422,24 +426,19 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
BUG_ON(ret);
}
#endif
- }
-
- /* Ensure that ballooned highmem pages don't have kmaps. */
- kmap_flush_unused();
- flush_tlb_all();
-
- /* No more mappings: invalidate P2M and add to balloon. */
- for (i = 0; i < nr_pages; i++) {
- pfn = mfn_to_pfn(frame_list[i]);
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
unsigned long p;
p = page_to_pfn(scratch_page);
__set_phys_to_machine(pfn, pfn_to_mfn(p));
}
+ put_balloon_scratch_page();
+
balloon_append(pfn_to_page(pfn));
}
- put_balloon_scratch_page();
+ /* Ensure that ballooned highmem pages don't have kmaps. */
+ kmap_flush_unused();
+ flush_tlb_all();
set_xen_guest_handle(reservation.extent_start, frame_list);
reservation.nr_extents = nr_pages;