From: Jason Gunthorpe <jgg@nvidia.com>
To: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Cc: iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
robin.murphy@arm.com, will@kernel.org, joro@8bytes.org,
kevin.tian@intel.com, nicolinc@nvidia.com, mshavit@google.com,
eric.auger@redhat.com, joao.m.martins@oracle.com,
jiangkunkun@huawei.com, zhukeqian1@huawei.com,
linuxarm@huawei.com
Subject: Re: [PATCH 4/5] iommu/arm-smmu-v3: Add set_dirty_tracking() support
Date: Wed, 29 Nov 2023 15:42:35 -0400 [thread overview]
Message-ID: <20231129194235.GC436702@nvidia.com> (raw)
In-Reply-To: <20231128094940.1344-5-shameerali.kolothum.thodi@huawei.com>
On Tue, Nov 28, 2023 at 09:49:39AM +0000, Shameer Kolothum wrote:
> From: Joao Martins <joao.m.martins@oracle.com>
>
> Dirty tracking will always be enabled with DBM=1 modifier enabled
> by default when HD is supported.
Is this trying to say that ARM doesn't have a per-table global enable
for dirty tracking but instead pre-sets the DBM bit to avoid the cost?
So on smmuv3 to enable we have to clear everything and disable
continues to pay a penalty since we don't go and mark all things as
dirty again?
Jason
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next prev parent reply other threads:[~2023-11-29 19:43 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-28 9:49 [PATCH 0/5] iommu/smmuv3: Add IOMMUFD dirty tracking support for SMMUv3 Shameer Kolothum
2023-11-28 9:49 ` [PATCH 1/5] iommu/arm-smmu-v3: Add feature detection for HTTU Shameer Kolothum
2023-11-29 19:49 ` Jason Gunthorpe
2023-11-28 9:49 ` [PATCH 2/5] iommu/arm-smmu-v3: Enable HTTU for stage1 with io-pgtable mapping Shameer Kolothum
2023-11-29 19:30 ` Jason Gunthorpe
2023-11-30 9:17 ` Shameerali Kolothum Thodi
2023-11-28 9:49 ` [PATCH 3/5] iommu/arm-smmu-v3: Add read_and_clear_dirty() support Shameer Kolothum
2023-11-29 19:35 ` Jason Gunthorpe
2023-11-30 9:05 ` Shameerali Kolothum Thodi
2023-11-28 9:49 ` [PATCH 4/5] iommu/arm-smmu-v3: Add set_dirty_tracking() support Shameer Kolothum
2023-11-29 19:42 ` Jason Gunthorpe [this message]
2023-11-30 8:56 ` Shameerali Kolothum Thodi
2023-11-30 12:54 ` Jason Gunthorpe
2023-11-30 14:04 ` Shameerali Kolothum Thodi
2023-12-14 16:23 ` Joao Martins
2023-11-28 9:49 ` [PATCH 5/5] iommu/arm-smmu-v3: Enforce dirty tracking in domain attach/alloc Shameer Kolothum
2023-11-29 19:48 ` Jason Gunthorpe
2023-11-30 9:01 ` Shameerali Kolothum Thodi
2023-12-14 16:29 ` Joao Martins
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