linux-kernel - Re: [PATCH 06/10] iommu/amd: Add functions copy_command_buffer/copy_event

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Message-ID: <20150929160439.GN3036@8bytes.org>
Date:	Tue, 29 Sep 2015 18:04:39 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Baoquan He <bhe@...hat.com>
Cc:	iommu@...ts.linux-foundation.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/10] iommu/amd: Add functions
 copy_command_buffer/copy_event_buffer

On Thu, Sep 24, 2015 at 02:37:32PM +0800, Baoquan He wrote:
> Copy command buffer and event buffer from the old to kdump kernel.
> 
> Still there are 2 problems:
>   1) Not very sure if this is necessary. If do not copy the old command buffer, and
> only set the newly allocated command buffer, is there anything wrong?

No, there is no need to copy command and event buffers. Just make sure
they get re-initialized and flush all iommu caches after setting the new
device table.


	Joerg

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