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

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Tuesday, September 4, 2012, 6:39:03 PM, you wrote:

> 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!

After applying this patch and due to the removal of the BUG_ON the domU boots 
and is reachable by SSH.
Serial log attached.



> 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

Attachment: serial-log.txt
Description: Text document

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