linux-kernel - Re: 2.6.25-rc1 xen pvops regression

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Date:	Tue, 26 Feb 2008 12:05:27 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mark McLoughlin <markmc@...hat.com>
CC:	Ian Campbell <ijc@...lion.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Joel Becker <Joel.Becker@...cle.com>,
	Jody Belka <lists-lkml@...b.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mika Penttila <mika.penttila@...umbus.fi>
Subject: Re: 2.6.25-rc1 xen pvops regression

Mark McLoughlin wrote:
>> @@ -371,6 +372,9 @@ void __init dmi_scan_machine(void)
>>  		}
>>  	}
>>  	else {
>> +		if (e820_all_mapped(0xF0000, 0xF0000+0x10000, E820_RAM))
>> +			goto out;
>>     
>
> 	One issue with using the e820 map for this is that a Xen Dom0 will also
> have this region marked as RAM in the e820 map, but will set up a fixmap
> for it, allowing dmi_scan_machine() to map the region.
>   

Would it be easier to just fake up a mapping so that window points to 
the real dmi area, and mark E820 accordingly?

    J
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