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[Xen-devel] Re: [Xen-ia64-devel] Oops from loop driver on IA64

from [Isaku Yamahata]

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To:	Kouya SHIMURA <kouya@xxxxxxxxxxxxxx>
Subject:	[Xen-devel] Re: [Xen-ia64-devel] Oops from loop driver on IA64
From:	Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date:	Tue, 18 Apr 2006 20:37:58 +0900
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On Tue, Apr 18, 2006 at 07:41:55PM +0900, Kouya SHIMURA wrote:
Content-Description: message body text

> We encounter a Oops message from loop driver when vbd is used
> in dom0 kernel with CONFIG_VIRTUAL_MEM_MAP on ia64.
> 
> I investigated this and might find a serious bug.
> On x86, flush_dcache_page() does nothing and there is no problem.
> But on ia64 flush_dcache_page() might access a wrong page struct
> and destroy the kernel memory.
> 
> Attached patch fixes this problem but it seems bad idea to modify
> a linux driver. How should we fix it?

Why is a invalid page passed?
Should it be fixed instead of modifying loop.c?

-- 
yamahata

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