From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: <will@kernel.org>, <robin.murphy@arm.com>, <joro@8bytes.org>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>,
<shameerali.kolothum.thodi@huawei.com>
Subject: Re: [PATCH v1 0/4] iommu/arm-smmu-v3: Allocate vmid per vsmmu instead of s2_parent
Date: Wed, 5 Mar 2025 11:46:18 -0800 [thread overview]
Message-ID: <Z8iqCpGo1Kx4TAvQ@Asurada-Nvidia> (raw)
In-Reply-To: <20250305192950.GA354511@nvidia.com>
On Wed, Mar 05, 2025 at 03:29:50PM -0400, Jason Gunthorpe wrote:
> On Wed, Mar 05, 2025 at 10:51:38AM -0800, Nicolin Chen wrote:
>
> > > I mean a normal S2 domain attaching to multiple devices on multiple
> > > instances.
> >
> > Oh, I haven't thought about a !nest_parent S2 case.
> >
> > A nest_parent case will not allow devices to attach the S2 but
> > always to a proxy nested S1 as we discussed previously. So, I
> > think the implementation could be very different?
>
> It could, and that is what you show here
>
> But also, it could be the same implementation.
OK.
Obviously I underestimated this part of work.
Implementation aside, this at lease needs some assessment of any
invalidation impact. I should do some extra tracing.
Thanks
Nicolin
prev parent reply other threads:[~2025-03-05 20:30 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-05 5:03 [PATCH v1 0/4] iommu/arm-smmu-v3: Allocate vmid per vsmmu instead of s2_parent Nicolin Chen
2025-03-05 5:04 ` [PATCH v1 1/4] iommu/arm-smmu-v3: Pass in vmid to arm_smmu_make_s2_domain_ste() Nicolin Chen
2025-03-05 8:50 ` Shameerali Kolothum Thodi
2025-03-05 17:44 ` Nicolin Chen
2025-04-07 8:37 ` Pranjal Shrivastava
2025-03-05 16:55 ` Jason Gunthorpe
2025-04-07 8:32 ` Pranjal Shrivastava
2025-03-05 5:04 ` [PATCH v1 2/4] iommu/arm-smmu-v3: Share arm_smmu_cmdq_issue_cmd_with_sync() with vsmmu Nicolin Chen
2025-04-07 8:43 ` Pranjal Shrivastava
2025-03-05 5:04 ` [PATCH v1 3/4] iommu/arm-smmu-v3: Decouple vmid from S2 nest_parent domain Nicolin Chen
2025-03-05 17:01 ` Jason Gunthorpe
2025-03-05 18:45 ` Nicolin Chen
2025-04-07 10:51 ` Pranjal Shrivastava
2025-04-07 16:52 ` Jason Gunthorpe
2025-04-08 14:20 ` Pranjal Shrivastava
2025-04-15 0:05 ` Nicolin Chen
2025-03-05 5:04 ` [PATCH v1 4/4] iommu/arm-smmu-v3-iommufd: Allow a shared s2_parent to allocate vSMMU Nicolin Chen
2025-03-05 9:01 ` Shameerali Kolothum Thodi
2025-03-05 16:57 ` Jason Gunthorpe
2025-03-05 17:49 ` Nicolin Chen
2025-03-05 16:54 ` [PATCH v1 0/4] iommu/arm-smmu-v3: Allocate vmid per vsmmu instead of s2_parent Jason Gunthorpe
2025-03-05 18:23 ` Nicolin Chen
2025-03-05 18:31 ` Jason Gunthorpe
2025-03-05 18:51 ` Nicolin Chen
2025-03-05 19:29 ` Jason Gunthorpe
2025-03-05 19:46 ` Nicolin Chen [this message]
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