From: Lu Baolu <baolu.lu@linux.intel.com>
To: Lianbo Jiang <lijiang@redhat.com>, linux-kernel@vger.kernel.org
Cc: thomas.lendacky@amd.com, iommu@lists.linux-foundation.org,
will@kernel.org, robin.murphy@arm.com
Subject: Re: [PATCH 0/2 v2] iommu: fix the failure of deferred attach for iommu attach device
Date: Tue, 19 Jan 2021 21:46:28 +0800 [thread overview]
Message-ID: <e896bbd5-fdf3-ca04-b2f2-f1c7910f1ee0@linux.intel.com> (raw)
In-Reply-To: <20210119111616.12761-1-lijiang@redhat.com>
On 2021/1/19 19:16, Lianbo Jiang wrote:
> This patchset is to fix the failure of deferred attach for iommu attach
> device, it includes the following two patches:
>
> [1] [PATCH 1/2] dma-iommu: use static-key to minimize the impact in the fast-path
> This is a prepared patch for the second one, move out the is_kdump_kernel()
> check from iommu_dma_deferred_attach() to iommu_dma_init(), and use the
> static-key in the fast-path to minimize the impact in the normal case.
>
> [2] [PATCH 2/2] iommu: use the __iommu_attach_device() directly for deferred attach
> Move the handling currently in iommu_dma_deferred_attach() into the
> iommu core code so that it can call the __iommu_attach_device()
> directly instead of the iommu_attach_device(). The external interface
> iommu_attach_device() is not suitable for handling this situation.
>
> Changes since v1:
> [1] use the __iommu_attach_device() directly for deferred attach
> [2] use static-key to minimize the impact in the fast-path
>
> Lianbo Jiang (2):
> dma-iommu: use static-key to minimize the impact in the fast-path
> iommu: use the __iommu_attach_device() directly for deferred attach
>
> drivers/iommu/dma-iommu.c | 29 +++++++++++------------------
> drivers/iommu/iommu.c | 12 ++++++++++++
> include/linux/iommu.h | 2 ++
> 3 files changed, 25 insertions(+), 18 deletions(-)
>
Good fix and improvement. For the patches in this series:
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Best regards,
baolu
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next prev parent reply other threads:[~2021-01-19 13:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-19 11:16 [PATCH 0/2 v2] iommu: fix the failure of deferred attach for iommu attach device Lianbo Jiang
2021-01-19 11:16 ` [PATCH 1/2 v2] dma-iommu: use static-key to minimize the impact in the fast-path Lianbo Jiang
2021-01-19 15:26 ` Christoph Hellwig
2021-01-19 15:52 ` Robin Murphy
2021-01-21 12:21 ` lijiang
2021-01-19 11:16 ` [PATCH 2/2 v2] iommu: use the __iommu_attach_device() directly for deferred attach Lianbo Jiang
2021-01-19 13:40 ` Robin Murphy
2021-01-19 15:29 ` Christoph Hellwig
2021-01-21 12:57 ` lijiang
2021-01-19 13:46 ` Lu Baolu [this message]
2021-01-28 11:04 ` [PATCH 0/2 v2] iommu: fix the failure of deferred attach for iommu attach device Joerg Roedel
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