diff options
Diffstat (limited to 'drivers/xen/balloon.c')
| -rw-r--r-- | drivers/xen/balloon.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index a50c6e3a7cc4..55ea73f7c70b 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; @@ -597,7 +596,7 @@ static void __init balloon_add_region(unsigned long start_pfn, } } -static int __cpuinit balloon_cpu_notify(struct notifier_block *self, +static int balloon_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { int cpu = (long)hcpu; @@ -617,7 +616,7 @@ static int __cpuinit balloon_cpu_notify(struct notifier_block *self, return NOTIFY_OK; } -static struct notifier_block balloon_cpu_notifier __cpuinitdata = { +static struct notifier_block balloon_cpu_notifier = { .notifier_call = balloon_cpu_notify, }; @@ -642,7 +641,7 @@ static int __init balloon_init(void) balloon_stats.current_pages = xen_pv_domain() ? min(xen_start_info->nr_pages - xen_released_pages, max_pfn) - : max_pfn; + : get_num_physpages(); balloon_stats.target_pages = balloon_stats.current_pages; balloon_stats.balloon_low = 0; balloon_stats.balloon_high = 0; |