linux-kernel - Re: [PATCH 07/10] iommu/amd: copy old dev tables and do not touch dev tables

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Message-ID: <20150929160808.GO3036@8bytes.org>
Date:	Tue, 29 Sep 2015 18:08:08 +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 07/10] iommu/amd: copy old dev tables and do not touch
 dev tables

On Thu, Sep 24, 2015 at 02:37:33PM +0800, Baoquan He wrote:
> +		 if ( !translation_pre_enabled() ) {
> +			iommu_disable(iommu);
> +			iommu_init_flags(iommu);
> +			iommu_set_device_table(iommu);
> +			iommu_enable_command_buffer(iommu);
> +			iommu_enable_event_buffer(iommu);
> +			iommu_set_exclusion_range(iommu);
> +			iommu_enable(iommu);
> +			iommu_flush_all_caches(iommu);
> +		} else {
> +			copy_dev_tables();
> +			copy_command_buffer();
> +			copy_event_buffer();
> +		}

Hmm, this leaves the old device-table in place and removes flushing the
iommu-caches in kdump kernel, right?


	Joerg

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