From: "Li, ZhenHua" <zhen-hual@hp.com>
To: Baoquan He <bhe@redhat.com>
Cc: Minfei Huang <mhuang@redhat.com>,
joro@8bytes.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
"Li, ZhenHua" <zhen-hual@hp.com>,
dwmw2@infradead.org
Subject: Re: [PATCH 1/1] x86/iommu: fix incorrect bit operations in setting values
Date: Fri, 14 Nov 2014 16:12:02 +0800 [thread overview]
Message-ID: <5465B952.3010702@hp.com> (raw)
In-Reply-To: <54655B0F.5070204@hp.com>
> 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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kexec@lists.infradead.org
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WARNING: multiple messages have this Message-ID (diff)
From: "Li, ZhenHua" <zhen-hual-VXdhtT5mjnY@public.gmane.org>
To: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Minfei Huang <mhuang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
"Li, ZhenHua" <zhen-hual-VXdhtT5mjnY@public.gmane.org>,
dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org
Subject: Re: [PATCH 1/1] x86/iommu: fix incorrect bit operations in setting values
Date: Fri, 14 Nov 2014 16:12:02 +0800 [thread overview]
Message-ID: <5465B952.3010702@hp.com> (raw)
In-Reply-To: <54655B0F.5070204-VXdhtT5mjnY@public.gmane.org>
> 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
WARNING: multiple messages have this Message-ID (diff)
From: "Li, ZhenHua" <zhen-hual@hp.com>
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
Date: Fri, 14 Nov 2014 16:12:02 +0800 [thread overview]
Message-ID: <5465B952.3010702@hp.com> (raw)
In-Reply-To: <54655B0F.5070204@hp.com>
> 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
next prev parent reply other threads:[~2014-11-14 8:13 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-05 7:30 [PATCH 1/1] x86/iommu: fix incorrect bit operations in setting values Li, Zhen-Hua
2014-11-05 7:30 ` Li, Zhen-Hua
[not found] ` <1415172619-4801-1-git-send-email-zhen-hual-VXdhtT5mjnY@public.gmane.org>
2014-11-05 7:35 ` Li, ZhenHua
2014-11-05 7:35 ` Li, ZhenHua
2014-11-06 13:41 ` Joerg Roedel
2014-11-06 13:41 ` Joerg Roedel
2014-11-12 11:28 ` Minfei Huang
2014-11-12 11:28 ` Minfei Huang
2014-11-12 11:28 ` Minfei Huang
2014-11-13 9:06 ` Li, ZhenHua
2014-11-13 9:06 ` Li, ZhenHua
2014-11-13 9:06 ` Li, ZhenHua
2014-11-13 13:37 ` Baoquan He
2014-11-13 13:37 ` Baoquan He
2014-11-13 13:37 ` Baoquan He
2014-11-14 1:29 ` Li, ZhenHua
2014-11-14 1:29 ` Li, ZhenHua
2014-11-14 1:29 ` Li, ZhenHua
2014-11-14 8:12 ` Li, ZhenHua [this message]
2014-11-14 8:12 ` Li, ZhenHua
2014-11-14 8:12 ` Li, ZhenHua
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