linux-kernel - Re: [PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem

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Date:	Wed, 13 May 2015 17:13:05 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Baoquan He <bhe@...hat.com>
CC:	dwmw2@...radead.org, indou.takao@...fujitsu.com, joro@...tes.org,
	vgoyal@...hat.com, dyoung@...hat.com,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, kexec@...ts.infradead.org,
	alex.williamson@...hat.com, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com,
	doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com,
	li.zhang6@...com, lisa.mitchell@...com, billsumnerlinux@...il.com,
	rwright@...com, "Li, ZhenHua" <zhen-hual@...com>
Subject: Re: [PATCH v11 04/10] iommu/vt-d: functions to copy data from old
 mem

Hi Baoquan,
I am using a list here to store all the mapped addresses, and unmap them 
out of iounmap.

About the reason, please check the old mails. I cannot remember the 
detailed reasons.

Thanks
Zhenhua

On 05/13/2015 05:00 PM, Baoquan He wrote:
> On 05/11/15 at 05:52pm, Li, Zhen-Hua wrote:
>> Add some functions to copy the data from old kernel.
>> These functions are used to copy context tables and page tables.
>>
>> To avoid calling iounmap between spin_lock_irqsave and spin_unlock_irqrestore,
>> use a link here, store the pointers , and then use iounmap to free them in
>> another place.
>
> Hi Zhenhua,
>
> I remember you mentioned iounmap will cause error inside
> spin_lock_irqsave. Do you know why it happened now? And could you also
> describe why avoid calling iounmap between
> spin_lock_irqsave/unlock_irqsave  is needed here and what's the status
> now?
>
> I think other reviewer may want to know it too.
>
> Thanks
> Baoquan
>

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