From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 06/10] iommu/amd: Add functions copy_command_buffer/copy_event_buffer
Date: Tue, 29 Sep 2015 18:04:39 +0200 [thread overview]
Message-ID: <20150929160439.GN3036@8bytes.org> (raw)
In-Reply-To: <1443076656-31776-7-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Baoquan He <bhe@redhat.com>
Cc: iommu@lists.linux-foundation.org, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 06/10] iommu/amd: Add functions copy_command_buffer/copy_event_buffer
Date: Tue, 29 Sep 2015 18:04:39 +0200 [thread overview]
Message-ID: <20150929160439.GN3036@8bytes.org> (raw)
In-Reply-To: <1443076656-31776-7-git-send-email-bhe@redhat.com>
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
next prev parent reply other threads:[~2015-09-29 16:04 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-24 6:37 [PATCH 00/10] Fix AMD IOMMU faults in kdump kernel Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 01/10] iommu/amd: Use standard bitmap operation to set bitmap Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 02/10] iommu/amd: Adjust functons which get first/last devid by reading pci config Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 03/10] iommu/amd: Get the first/last device of iommu earlier Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 04/10] iommu/amd: Detect pre enabled translation Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 05/10] iommu/amd: Add function copy_dev_tables Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 06/10] iommu/amd: Add functions copy_command_buffer/copy_event_buffer Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
[not found] ` <1443076656-31776-7-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-29 16:04 ` Joerg Roedel [this message]
2015-09-29 16:04 ` Joerg Roedel
2015-10-10 12:24 ` Baoquan He
2015-10-10 12:24 ` Baoquan He
2015-09-24 6:37 ` [PATCH 07/10] iommu/amd: copy old dev tables and do not touch dev tables Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
[not found] ` <1443076656-31776-8-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-29 16:08 ` Joerg Roedel
2015-09-29 16:08 ` Joerg Roedel
2015-10-10 12:28 ` Baoquan He
2015-10-10 12:28 ` Baoquan He
2015-10-10 12:28 ` Baoquan He
2015-09-24 6:37 ` [PATCH 08/10] iommu/amd: Do not update the information of domain to devtables before device driver init Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` [PATCH 09/10] iommu/amd: Clear the iommu pre enabled setting Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
[not found] ` <1443076656-31776-10-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-29 16:09 ` Joerg Roedel
2015-09-29 16:09 ` Joerg Roedel
2015-10-10 12:30 ` Baoquan He
2015-10-10 12:30 ` Baoquan He
2015-10-10 12:30 ` Baoquan He
2015-09-24 6:37 ` [PATCH 10/10] iommu/amd: Copy the old ir table Baoquan He
2015-09-24 6:37 ` Baoquan He
2015-09-24 6:37 ` Baoquan He
[not found] ` <1443076656-31776-11-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2015-09-29 16:11 ` Joerg Roedel
2015-09-29 16:11 ` Joerg Roedel
2015-10-10 12:40 ` Baoquan He
2015-10-10 12:40 ` Baoquan He
2015-10-10 12:40 ` Baoquan He
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