linux-kernel - Re: [PATCH 1/1] x86/iommu: fix incorrect bit operations in setting values

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Message-ID: <5465B952.3010702@hp.com>
Date:	Fri, 14 Nov 2014 16:12:02 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Baoquan He <bhe@...hat.com>
CC:	"Li, ZhenHua" <zhen-hual@...com>, Minfei Huang <mhuang@...hat.com>,
	kexec@...ts.infradead.org, joro@...tes.org, dwmw2@...radead.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86/iommu: fix incorrect bit operations in setting
 values


> 1st step shows we should NOT disable the iommu when it is already
> enabled. But current code does disable-enable. So there is still works
> to do.
>

The original kernel does a disable and re-enable , Bill's patchset 
removed the disable operation.

> I think step 2 is necessary, because when the driver initializes, the
> device need a new map, and the old data from the old kernel can not be
> used for the new driver.
>
> Now I am trying to implement these ideas.
>
>> Thanks
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