[Xen-devel] RE: [PATCH] calling zap_low_mappings breaks xen boot

To:	"Keir Fraser" <keir@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] RE: [PATCH] calling zap_low_mappings breaks xen boot on the es7000
From:	"Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx>
Date:	Fri, 25 May 2007 08:24:24 -0400
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Thread-topic:	[PATCH] calling zap_low_mappings breaks xen boot on the es7000

Keir,
>>> Either we should just delay the zap_low_mappings() call, or 
>fix your 
>>> code to map_domain_page()/unmap_domain_page(). How late in boot do 
>>> you need the low mappings?
>> 
>> This patch delays the zap_low_mappings() call until after the 
>> smp_prepare_cpus call. With this patch, I am able to run Xen on the 
>> ES7000 and a Dell SC 1430.
>
>So where is the late low-memory access happening? There's not 
>that much es7000-specific code. It can't be hard to fix 
>properly. If the physical pointer is known to be below 1MB you 
>can just __va() it. If not you may need to use a fixmap, or 
>acpi_map_table, or just __va() only on x86_64. I'd like to 
>keep the zap as early as possible to catch truly erroneous low 
>pointers.
I will look into that code and fix it.
If you don't mind me asking, what exactly does zap_low_mappings do? I am
not able to figure it out looking at the code.
Thanks
Raj

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