Merge tag 'stable/for-linus-3.20-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen features and fixes from David Vrabel:

 - Reworked handling for foreign (grant mapped) pages to simplify the
   code, enable a number of additional use cases and fix a number of
   long-standing bugs.

 - Prefer the TSC over the Xen PV clock when dom0 (and the TSC is
   stable).

 - Assorted other cleanup and minor bug fixes.

* tag 'stable/for-linus-3.20-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (25 commits)
  xen/manage: Fix USB interaction issues when resuming
  xenbus: Add proper handling of XS_ERROR from Xenbus for transactions.
  xen/gntdev: provide find_special_page VMA operation
  xen/gntdev: mark userspace PTEs as special on x86 PV guests
  xen-blkback: safely unmap grants in case they are still in use
  xen/gntdev: safely unmap grants in case they are still in use
  xen/gntdev: convert priv->lock to a mutex
  xen/grant-table: add a mechanism to safely unmap pages that are in use
  xen-netback: use foreign page information from the pages themselves
  xen: mark grant mapped pages as foreign
  xen/grant-table: add helpers for allocating pages
  x86/xen: require ballooned pages for grant maps
  xen: remove scratch frames for ballooned pages and m2p override
  xen/grant-table: pre-populate kernel unmap ops for xen_gnttab_unmap_refs()
  mm: add 'foreign' alias for the 'pinned' page flag
  mm: provide a find_special_page vma operation
  x86/xen: cleanup arch/x86/xen/mmu.c
  x86/xen: add some __init annotations in arch/x86/xen/mmu.c
  x86/xen: add some __init and static annotations in arch/x86/xen/setup.c
  x86/xen: use correct types for addresses in arch/x86/xen/setup.c
  ...

1 files changed, 2 insertions, 84 deletions

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 3860d02..0b52d92 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -92,7 +92,6 @@ EXPORT_SYMBOL_GPL(balloon_stats);
 
 /* We increase/decrease in batches which fit in a page */
 static xen_pfn_t frame_list[PAGE_SIZE / sizeof(unsigned long)];
-static DEFINE_PER_CPU(struct page *, balloon_scratch_page);
 
 
 /* List of ballooned pages, threaded through the mem_map array. */
@@ -423,22 +422,12 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
 		page = pfn_to_page(pfn);
 
 #ifdef CONFIG_XEN_HAVE_PVMMU
-		/*
-		 * Ballooned out frames are effectively replaced with
-		 * a scratch frame.  Ensure direct mappings and the
-		 * p2m are consistent.
-		 */
 		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
 			if (!PageHighMem(page)) {
-				struct page *scratch_page = get_balloon_scratch_page();
-
 				ret = HYPERVISOR_update_va_mapping(
 						(unsigned long)__va(pfn << PAGE_SHIFT),
-						pfn_pte(page_to_pfn(scratch_page),
-							PAGE_KERNEL_RO), 0);
+						__pte_ma(0), 0);
 				BUG_ON(ret);
-
-				put_balloon_scratch_page();
 			}
 			__set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
 		}
@@ -500,18 +489,6 @@ static void balloon_process(struct work_struct *work)
 	mutex_unlock(&balloon_mutex);
 }
 
-struct page *get_balloon_scratch_page(void)
-{
-	struct page *ret = get_cpu_var(balloon_scratch_page);
-	BUG_ON(ret == NULL);
-	return ret;
-}
-
-void put_balloon_scratch_page(void)
-{
-	put_cpu_var(balloon_scratch_page);
-}
-
 /* Resets the Xen limit, sets new target, and kicks off processing. */
 void balloon_set_new_target(unsigned long target)
 {
@@ -605,61 +582,13 @@ static void __init balloon_add_region(unsigned long start_pfn,
 	}
 }
 
-static int alloc_balloon_scratch_page(int cpu)
-{
-	if (per_cpu(balloon_scratch_page, cpu) != NULL)
-		return 0;
-
-	per_cpu(balloon_scratch_page, cpu) = alloc_page(GFP_KERNEL);
-	if (per_cpu(balloon_scratch_page, cpu) == NULL) {
-		pr_warn("Failed to allocate balloon_scratch_page for cpu %d\n", cpu);
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-
-static int balloon_cpu_notify(struct notifier_block *self,
-				    unsigned long action, void *hcpu)
-{
-	int cpu = (long)hcpu;
-	switch (action) {
-	case CPU_UP_PREPARE:
-		if (alloc_balloon_scratch_page(cpu))
-			return NOTIFY_BAD;
-		break;
-	default:
-		break;
-	}
-	return NOTIFY_OK;
-}
-
-static struct notifier_block balloon_cpu_notifier = {
-	.notifier_call	= balloon_cpu_notify,
-};
-
 static int __init balloon_init(void)
 {
-	int i, cpu;
+	int i;
 
 	if (!xen_domain())
 		return -ENODEV;
 
-	if (!xen_feature(XENFEAT_auto_translated_physmap)) {
-		register_cpu_notifier(&balloon_cpu_notifier);
-
-		get_online_cpus();
-		for_each_online_cpu(cpu) {
-			if (alloc_balloon_scratch_page(cpu)) {
-				put_online_cpus();
-				unregister_cpu_notifier(&balloon_cpu_notifier);
-				return -ENOMEM;
-			}
-		}
-		put_online_cpus();
-	}
-
 	pr_info("Initialising balloon driver\n");
 
 	balloon_stats.current_pages = xen_pv_domain()
@@ -696,15 +625,4 @@ static int __init balloon_init(void)
 
 subsys_initcall(balloon_init);
 
-static int __init balloon_clear(void)
-{
-	int cpu;
-
-	for_each_possible_cpu(cpu)
-		per_cpu(balloon_scratch_page, cpu) = NULL;
-
-	return 0;
-}
-early_initcall(balloon_clear);
-
 MODULE_LICENSE("GPL");