linux-kernel - Re: [PATCH] xen: switch to post-init routines in xen mmu.c earlier

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Message-ID: <548928ED.9060800@suse.com>
Date:	Thu, 11 Dec 2014 06:17:33 +0100
From:	Juergen Gross <jgross@...e.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	david.vrabel@...rix.com, boris.ostrovsky@...cle.com
Subject: Re: [PATCH] xen: switch to post-init routines in xen mmu.c earlier

On 12/10/2014 05:13 PM, Konrad Rzeszutek Wilk wrote:
> On Wed, Dec 10, 2014 at 04:56:03PM +0100, Juergen Gross wrote:
>> With the virtual mapped linear p2m list the post-init mmu operations
>> must be used for setting up the p2m mappings, as in case of
>> CONFIG_FLATMEM the init routines may trigger BUGs.
>
> Um, could you explain a bit more of why the CONFIG_FLATMEM
> is such unique? What about the other CONFIG_*MEM cases?

CONFIG_FLATMEM is just the configuration hitting a BUG() in
xen_alloc_pte_init() being used after finishing paging_init().

Juergen

>
>>
>> Reported-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
>> ---
>>   arch/x86/xen/mmu.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
>> index 6ab6150..a1a429a 100644
>> --- a/arch/x86/xen/mmu.c
>> +++ b/arch/x86/xen/mmu.c
>> @@ -1225,6 +1225,7 @@ static void __init xen_pagetable_p2m_setup(void)
>>   static void __init xen_pagetable_init(void)
>>   {
>>   	paging_init();
>> +	xen_post_allocator_init();
>>
>>   	xen_pagetable_p2m_setup();
>>
>> @@ -1236,7 +1237,6 @@ static void __init xen_pagetable_init(void)
>>   		xen_remap_memory();
>>
>>   	xen_setup_shared_info();
>> -	xen_post_allocator_init();
>>   }
>>   static void xen_write_cr2(unsigned long cr2)
>>   {
>> --
>> 2.1.2
>>
> --
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