linux-kernel - [Xen-devel] Re: [patch 16/21] Xen-paravirt: Add code into head.S to handle being booted by Xen

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Date:	Wed, 14 Feb 2007 08:56:09 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	<virtualization@...ts.osdl.org>, <xen-devel@...ts.xensource.com>,
	"Andi Kleen" <ak@....de>, "Andrew Morton" <akpm@...l.org>,
	"Chris Wright" <chrisw@...s-sol.org>,
	<linux-kernel@...r.kernel.org>, "Zachary Amsden" <zach@...are.com>
Subject: [Xen-devel] Re: [patch 16/21] Xen-paravirt: Add code into
	head.S to handle being booted by Xen

>>> @@ -528,7 +532,7 @@ ENTRY(_stext)
>>>  /*
>>>   * BSS section
>>>   */
>>> -.section ".bss.page_aligned","w"
>>> +.section ".bss.page_aligned"
>>>     
>>
>> Why? 
>>   
>
>I got complaints about section attribute mismatches without it.

Then perhaps ... "aw" is meant?

>>> +fastcall unsigned long long xen_pgd_val(pgd_t pgd)
>>> +{
>>> +	unsigned long long ret = pgd.pgd;
>>> +	if (ret)
>>> +		ret = machine_to_phys(XMADDR(ret)).paddr | 1;
>>>     
>>
>> Why can they be 0 here anyways?
>>
>> Normally they are all considered undefined when not present
>>   
>
>Not sure.

This should probably get sync-ed up with the page table handling changes
submitted to xen-devel yesterday. Using zero/non-zero tests in contexts
like this was always broken; should check for _PAGE_PRESENT.

Jan
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