Re: dom0 linux 3.6.0-rc4, crash due to ballooning althoug dom0_mem=X, max:X set

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Sep 04, 2012 at 06:37:57PM +0200, Sander Eikelenboom wrote:
> Hi Konrad,
> 
> This seems to happen only on a intel machine i'm trying to setup as a development machine (haven't seen it on my amd).
> It boots fine, i have dom0_mem=1024M,max:1024M set, the machine has 2G of mem.
> 
> Dom0 and guest kernel are 3.6.0-rc4 with config:
> [*] Xen memory balloon driver
> [*]   Scrub pages before returning them to system

Can you also try this patch out and provide the full log (bootup and such). Thanks!

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 31ab82f..871a93c 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -355,8 +355,12 @@ static enum bp_state increase_reservation(unsigned long nr_pages)
 		BUG_ON(page == NULL);
 
 		pfn = page_to_pfn(page);
-		BUG_ON(!xen_feature(XENFEAT_auto_translated_physmap) &&
-		       phys_to_machine_mapping_valid(pfn));
+		if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+			if (phys_to_machine_mapping_valid(pfn)) {
+				printk(KERN_DEBUG "%lx is %lx!\n", pfn, get_phys_to_machine(pfn));
+				continue;
+			}
+		}
 
 		set_phys_to_machine(pfn, frame_list[i]);
 
@@ -572,6 +576,7 @@ static void __init balloon_add_region(unsigned long start_pfn,
 	 */
 	extra_pfn_end = min(max_pfn, start_pfn + pages);
 
+	printk(KERN_INFO "%s: [%lx->%lx]\n", __func__, start_pfn, extra_pfn_end);
 	for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
 		page = pfn_to_page(pfn);
 		/* totalram_pages and totalhigh_pages do not