Message-ID: <5465B952.3010702@hp.com>
Date: Fri, 14 Nov 2014 16:12:02 +0800
From: "Li, ZhenHua" <zhen-hual@hp.com>
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To: Baoquan He <bhe@redhat.com>
CC: "Li, ZhenHua" <zhen-hual@hp.com>, Minfei Huang <mhuang@redhat.com>,
        kexec@lists.infradead.org, joro@8bytes.org, dwmw2@infradead.org,
        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] x86/iommu: fix incorrect bit operations in setting
 values
References: <1415172619-4801-1-git-send-email-zhen-hual@hp.com> <20141112112832.GA3334@dhcp-17-108.nay.redhat.com> <546474AF.2030902@hp.com> <20141113133708.GA1678@dhcp-17-102.nay.redhat.com> <54655B0F.5070204@hp.com>
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> 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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