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From: Lu Baolu <baolu.lu@linux.intel.com>
To: John Garry <john.garry@huawei.com>,
	joro@8bytes.org, will@kernel.org, dwmw2@infradead.org,
	robin.murphy@arm.com
Cc: baolu.lu@linux.intel.com, linux-kernel@vger.kernel.org,
	iommu@lists.linux-foundation.org, linuxarm@huawei.com,
	thunder.leizhen@huawei.com, chenxiang66@hisilicon.com
Subject: Re: [PATCH v12 2/5] iommu: Enhance IOMMU default DMA mode build options
Date: Sat, 12 Jun 2021 09:21:59 +0800	[thread overview]
Message-ID: <a4c85f00-918b-5952-7585-8e1110ac5195@linux.intel.com> (raw)
In-Reply-To: <1623414043-40745-3-git-send-email-john.garry@huawei.com>

On 2021/6/11 20:20, John Garry wrote:
> +config IOMMU_DEFAULT_LAZY
> +	bool "lazy"
> +	help
> +	  Support lazy mode, where for every IOMMU DMA unmap operation, the
> +	  flush operation of IOTLB and the free operation of IOVA are deferred.
> +	  They are only guaranteed to be done before the related IOVA will be
> +	  reused.
> +
> +	  The isolation provided in this mode is not as secure as STRICT mode,
> +	  such that a vulnerable time window may be created between the DMA
> +	  unmap and the mapping finally being torn down in the IOMMU, where the
> +	  device can still access the system memory. However this mode may

" ... and the mappings cached in the IOMMU IOTLB or device TLB finally
being invalidated, where the device probably can still access the memory
which has already been unmapped by the device driver."

Best regards,
baolu

WARNING: multiple messages have this Message-ID (diff)
From: Lu Baolu <baolu.lu@linux.intel.com>
To: John Garry <john.garry@huawei.com>,
	joro@8bytes.org, will@kernel.org, dwmw2@infradead.org,
	robin.murphy@arm.com
Cc: linuxarm@huawei.com, linux-kernel@vger.kernel.org,
	iommu@lists.linux-foundation.org
Subject: Re: [PATCH v12 2/5] iommu: Enhance IOMMU default DMA mode build options
Date: Sat, 12 Jun 2021 09:21:59 +0800	[thread overview]
Message-ID: <a4c85f00-918b-5952-7585-8e1110ac5195@linux.intel.com> (raw)
In-Reply-To: <1623414043-40745-3-git-send-email-john.garry@huawei.com>

On 2021/6/11 20:20, John Garry wrote:
> +config IOMMU_DEFAULT_LAZY
> +	bool "lazy"
> +	help
> +	  Support lazy mode, where for every IOMMU DMA unmap operation, the
> +	  flush operation of IOTLB and the free operation of IOVA are deferred.
> +	  They are only guaranteed to be done before the related IOVA will be
> +	  reused.
> +
> +	  The isolation provided in this mode is not as secure as STRICT mode,
> +	  such that a vulnerable time window may be created between the DMA
> +	  unmap and the mapping finally being torn down in the IOMMU, where the
> +	  device can still access the system memory. However this mode may

" ... and the mappings cached in the IOMMU IOTLB or device TLB finally
being invalidated, where the device probably can still access the memory
which has already been unmapped by the device driver."

Best regards,
baolu
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2021-06-12  1:22 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-11 12:20 [PATCH v12 0/5] Enhance IOMMU default DMA mode build options John Garry
2021-06-11 12:20 ` John Garry
2021-06-11 12:20 ` [PATCH v12 1/5] iommu: Print strict or lazy mode at init time John Garry
2021-06-11 12:20   ` John Garry
2021-06-14 15:54   ` Robin Murphy
2021-06-14 15:54     ` Robin Murphy
2021-06-11 12:20 ` [PATCH v12 2/5] iommu: Enhance IOMMU default DMA mode build options John Garry
2021-06-11 12:20   ` John Garry
2021-06-12  1:21   ` Lu Baolu [this message]
2021-06-12  1:21     ` Lu Baolu
2021-06-14  8:11     ` John Garry
2021-06-14  8:11       ` John Garry
2021-06-12  2:12   ` Lu Baolu
2021-06-12  2:12     ` Lu Baolu
2021-06-14 16:03   ` Robin Murphy
2021-06-14 16:03     ` Robin Murphy
2021-06-11 12:20 ` [PATCH v12 3/5] iommu/vt-d: Add support for " John Garry
2021-06-11 12:20   ` John Garry
2021-06-12  2:14   ` Lu Baolu
2021-06-12  2:14     ` Lu Baolu
2021-06-14  8:03     ` John Garry
2021-06-14  8:03       ` John Garry
2021-06-15  7:26       ` Lu Baolu
2021-06-15  7:26         ` Lu Baolu
2021-06-15  8:25         ` Robin Murphy
2021-06-15  8:25           ` Robin Murphy
2021-06-16  8:42           ` Lu Baolu
2021-06-16  8:42             ` Lu Baolu
2021-06-12  2:22   ` Lu Baolu
2021-06-12  2:22     ` Lu Baolu
2021-06-14  7:53     ` John Garry
2021-06-14  7:53       ` John Garry
2021-06-14 14:11       ` Robin Murphy
2021-06-14 14:11         ` Robin Murphy
2021-06-14 14:19         ` John Garry
2021-06-14 14:19           ` John Garry
2021-06-14 15:05           ` Robin Murphy
2021-06-14 15:05             ` Robin Murphy
2021-06-11 12:20 ` [PATCH v12 4/5] iommu/amd: " John Garry
2021-06-11 12:20   ` John Garry
2021-06-11 12:20 ` [PATCH v12 5/5] iommu: Remove mode argument from iommu_set_dma_strict() John Garry
2021-06-11 12:20   ` John Garry
2021-06-12  2:23   ` Lu Baolu
2021-06-12  2:23     ` Lu Baolu
2021-06-14  7:46     ` John Garry
2021-06-14  7:46       ` John Garry
2021-06-14 16:25   ` Robin Murphy
2021-06-14 16:25     ` Robin Murphy
2021-06-14 17:03     ` John Garry
2021-06-14 17:03       ` John Garry
2021-06-14 17:19       ` Robin Murphy
2021-06-14 17:19         ` Robin Murphy
2021-06-14 17:24         ` John Garry
2021-06-14 17:24           ` John Garry

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