From: Nicolin Chen <nicolinc@nvidia.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: <jgg@nvidia.com>, <robin.murphy@arm.com>, <will@kernel.org>,
<eric.auger@redhat.com>, <kevin.tian@intel.com>,
<baolu.lu@linux.intel.com>, <joro@8bytes.org>,
<shameerali.kolothum.thodi@huawei.com>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, <yi.l.liu@intel.com>
Subject: Re: [PATCH v1 02/14] iommufd: Add nesting related data structures for ARM SMMUv3
Date: Thu, 9 Mar 2023 21:04:20 -0800 [thread overview]
Message-ID: <ZAq6VKmDbVT63cot@Asurada-Nvidia> (raw)
In-Reply-To: <20230309134217.GA1673607@myrica>
Hi Jeans,
Allow me to partially reply your email:
On Thu, Mar 09, 2023 at 01:42:17PM +0000, Jean-Philippe Brucker wrote:
> > +struct iommu_hwpt_arm_smmuv3 {
> > +#define IOMMU_SMMUV3_FLAG_S2 (1 << 0) /* if unset, stage-1 */
>
> I don't understand the purpose of this flag, since the structure only
> provides stage-1 configuration fields
I should have probably put more description for this flag. It
is used to allocate a stage-2 domain for a nested translation
setup. The default allocation for a kernel-managed domain will
allocate an S1 format of IO page table, at ARM_SMMU_DOMAIN_S1
stage. But a nested kernel-managed domain needs an S2 format,
at ARM_SMMU_DOMAIN_S2.
So the whole structure seems to only provide stage-1 info but
it's used for both stages. And a stage-2 allocation will only
need s2vmid if VMID flag is set (explaining below).
> > +#define IOMMU_SMMUV3_FLAG_VMID (1 << 1) /* vmid override */
>
> Doesn't this break isolation? The VMID space is global for the SMMU, so
> the guest could access cached mappings of another device
This flag isn't mature yet. I kept it from my internal RFC to
see if we can have a better solution. There are use cases on
certain platforms where the VMIDs across all devices in the
same VM need to be aligned.
Thanks
Nic
WARNING: multiple messages have this Message-ID (diff)
From: Nicolin Chen <nicolinc@nvidia.com>
To: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: <jgg@nvidia.com>, <robin.murphy@arm.com>, <will@kernel.org>,
<eric.auger@redhat.com>, <kevin.tian@intel.com>,
<baolu.lu@linux.intel.com>, <joro@8bytes.org>,
<shameerali.kolothum.thodi@huawei.com>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, <yi.l.liu@intel.com>
Subject: Re: [PATCH v1 02/14] iommufd: Add nesting related data structures for ARM SMMUv3
Date: Thu, 9 Mar 2023 21:04:20 -0800 [thread overview]
Message-ID: <ZAq6VKmDbVT63cot@Asurada-Nvidia> (raw)
In-Reply-To: <20230309134217.GA1673607@myrica>
Hi Jeans,
Allow me to partially reply your email:
On Thu, Mar 09, 2023 at 01:42:17PM +0000, Jean-Philippe Brucker wrote:
> > +struct iommu_hwpt_arm_smmuv3 {
> > +#define IOMMU_SMMUV3_FLAG_S2 (1 << 0) /* if unset, stage-1 */
>
> I don't understand the purpose of this flag, since the structure only
> provides stage-1 configuration fields
I should have probably put more description for this flag. It
is used to allocate a stage-2 domain for a nested translation
setup. The default allocation for a kernel-managed domain will
allocate an S1 format of IO page table, at ARM_SMMU_DOMAIN_S1
stage. But a nested kernel-managed domain needs an S2 format,
at ARM_SMMU_DOMAIN_S2.
So the whole structure seems to only provide stage-1 info but
it's used for both stages. And a stage-2 allocation will only
need s2vmid if VMID flag is set (explaining below).
> > +#define IOMMU_SMMUV3_FLAG_VMID (1 << 1) /* vmid override */
>
> Doesn't this break isolation? The VMID space is global for the SMMU, so
> the guest could access cached mappings of another device
This flag isn't mature yet. I kept it from my internal RFC to
see if we can have a better solution. There are use cases on
certain platforms where the VMIDs across all devices in the
same VM need to be aligned.
Thanks
Nic
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next prev parent reply other threads:[~2023-03-10 5:04 UTC|newest]
Thread overview: 330+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-09 10:53 [PATCH v1 00/14] Add Nested Translation Support for SMMUv3 Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 01/14] iommu: Add iommu_get_unmanaged_domain helper Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 12:51 ` Robin Murphy
2023-03-09 12:51 ` Robin Murphy
2023-03-09 14:19 ` Jason Gunthorpe
2023-03-09 14:19 ` Jason Gunthorpe
2023-03-09 19:04 ` Robin Murphy
2023-03-09 19:04 ` Robin Murphy
2023-03-10 0:23 ` Jason Gunthorpe
2023-03-10 0:23 ` Jason Gunthorpe
2023-03-10 8:41 ` Eric Auger
2023-03-10 8:41 ` Eric Auger
2023-03-10 15:55 ` Jason Gunthorpe
2023-03-10 15:55 ` Jason Gunthorpe
2023-03-16 1:21 ` Nicolin Chen
2023-03-16 1:21 ` Nicolin Chen
2023-03-16 18:42 ` Robin Murphy
2023-03-16 18:42 ` Robin Murphy
2023-03-16 20:01 ` Nicolin Chen
2023-03-16 20:01 ` Nicolin Chen
2023-03-20 12:51 ` Jason Gunthorpe
2023-03-20 12:51 ` Jason Gunthorpe
2023-03-10 10:14 ` Eric Auger
2023-03-10 10:14 ` Eric Auger
2023-03-10 15:33 ` Jason Gunthorpe
2023-03-10 15:33 ` Jason Gunthorpe
2023-03-10 15:44 ` Shameerali Kolothum Thodi
2023-03-10 15:44 ` Shameerali Kolothum Thodi
2023-03-10 15:56 ` Jason Gunthorpe
2023-03-10 15:56 ` Jason Gunthorpe
2023-03-10 16:07 ` Shameerali Kolothum Thodi
2023-03-10 16:07 ` Shameerali Kolothum Thodi
2023-03-10 16:21 ` Jason Gunthorpe
2023-03-10 16:21 ` Jason Gunthorpe
2023-03-10 16:30 ` Shameerali Kolothum Thodi
2023-03-10 16:30 ` Shameerali Kolothum Thodi
2023-03-10 17:03 ` Jason Gunthorpe
2023-03-10 17:03 ` Jason Gunthorpe
2023-03-22 16:07 ` Eric Auger
2023-03-22 16:07 ` Eric Auger
2023-03-22 17:02 ` Jason Gunthorpe
2023-03-22 17:02 ` Jason Gunthorpe
2023-03-22 17:41 ` Eric Auger
2023-03-22 17:41 ` Eric Auger
2023-03-22 18:07 ` Jason Gunthorpe
2023-03-22 18:07 ` Jason Gunthorpe
2023-03-16 19:51 ` Nicolin Chen
2023-03-16 19:51 ` Nicolin Chen
2023-03-16 19:56 ` Shameerali Kolothum Thodi
2023-03-16 19:56 ` Shameerali Kolothum Thodi
2023-03-22 15:44 ` Eric Auger
2023-03-22 15:44 ` Eric Auger
2023-03-09 10:53 ` [PATCH v1 02/14] iommufd: Add nesting related data structures for ARM SMMUv3 Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 13:42 ` Jean-Philippe Brucker
2023-03-09 13:42 ` Jean-Philippe Brucker
2023-03-09 14:48 ` Jason Gunthorpe
2023-03-09 14:48 ` Jason Gunthorpe
2023-03-09 18:26 ` Jean-Philippe Brucker
2023-03-09 18:26 ` Jean-Philippe Brucker
2023-03-09 21:01 ` Jason Gunthorpe
2023-03-09 21:01 ` Jason Gunthorpe
2023-03-10 12:16 ` Jean-Philippe Brucker
2023-03-10 12:16 ` Jean-Philippe Brucker
2023-03-10 14:52 ` Robin Murphy
2023-03-10 14:52 ` Robin Murphy
2023-03-10 15:25 ` Jason Gunthorpe
2023-03-10 15:25 ` Jason Gunthorpe
2023-03-10 15:57 ` Robin Murphy
2023-03-10 15:57 ` Robin Murphy
2023-03-10 16:03 ` Jason Gunthorpe
2023-03-10 16:03 ` Jason Gunthorpe
2023-03-17 10:10 ` Tian, Kevin
2023-03-17 10:10 ` Tian, Kevin
2023-03-17 10:04 ` Tian, Kevin
2023-03-17 10:04 ` Tian, Kevin
2023-03-10 4:50 ` Nicolin Chen
2023-03-10 4:50 ` Nicolin Chen
2023-03-10 12:54 ` Jean-Philippe Brucker
2023-03-10 12:54 ` Jean-Philippe Brucker
2023-03-10 14:00 ` Jason Gunthorpe
2023-03-10 14:00 ` Jason Gunthorpe
2023-03-10 16:06 ` Jason Gunthorpe
2023-03-10 16:06 ` Jason Gunthorpe
2023-03-16 0:59 ` Nicolin Chen
2023-03-16 0:59 ` Nicolin Chen
2023-03-09 15:26 ` Shameerali Kolothum Thodi
2023-03-09 15:26 ` Shameerali Kolothum Thodi
2023-03-09 15:40 ` Jason Gunthorpe
2023-03-09 15:40 ` Jason Gunthorpe
2023-03-09 15:51 ` Shameerali Kolothum Thodi
2023-03-09 15:51 ` Shameerali Kolothum Thodi
2023-03-09 15:59 ` Jason Gunthorpe
2023-03-09 15:59 ` Jason Gunthorpe
2023-03-09 16:07 ` Shameerali Kolothum Thodi
2023-03-09 16:07 ` Shameerali Kolothum Thodi
2023-03-10 5:26 ` Nicolin Chen
2023-03-10 5:26 ` Nicolin Chen
2023-03-10 5:36 ` Nicolin Chen
2023-03-10 5:36 ` Nicolin Chen
2023-03-10 12:55 ` Jason Gunthorpe
2023-03-10 12:55 ` Jason Gunthorpe
2023-03-10 5:18 ` Nicolin Chen
2023-03-10 5:18 ` Nicolin Chen
2023-03-10 5:04 ` Nicolin Chen [this message]
2023-03-10 5:04 ` Nicolin Chen
2023-03-10 11:33 ` Eric Auger
2023-03-10 11:33 ` Eric Auger
2023-03-10 12:51 ` Jason Gunthorpe
2023-03-10 12:51 ` Jason Gunthorpe
2023-03-17 10:17 ` Tian, Kevin
2023-03-17 10:17 ` Tian, Kevin
2023-03-09 10:53 ` [PATCH v1 03/14] iommufd/device: Setup MSI on kernel-managed domains Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-10 16:45 ` Eric Auger
2023-03-10 16:45 ` Eric Auger
2023-03-11 0:17 ` Nicolin Chen
2023-03-11 0:17 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 04/14] iommu/arm-smmu-v3: Add arm_smmu_hw_info Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 13:03 ` Robin Murphy
2023-03-09 13:03 ` Robin Murphy
2023-03-10 1:17 ` Nicolin Chen
2023-03-10 1:17 ` Nicolin Chen
2023-03-10 15:28 ` Robin Murphy
2023-03-10 15:28 ` Robin Murphy
2023-03-16 0:13 ` Nicolin Chen
2023-03-16 0:13 ` Nicolin Chen
2023-03-16 15:19 ` Robin Murphy
2023-03-16 15:19 ` Robin Murphy
2023-03-16 20:06 ` Nicolin Chen
2023-03-16 20:06 ` Nicolin Chen
2023-04-12 7:47 ` Nicolin Chen
2023-04-12 7:47 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 05/14] iommu/arm-smmu-v3: Remove ARM_SMMU_DOMAIN_NESTED Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-10 16:39 ` Eric Auger
2023-03-10 16:39 ` Eric Auger
2023-03-10 17:05 ` Jason Gunthorpe
2023-03-10 17:05 ` Jason Gunthorpe
2023-03-11 0:24 ` Nicolin Chen
2023-03-11 0:24 ` Nicolin Chen
2023-03-11 0:23 ` Nicolin Chen
2023-03-11 0:23 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 06/14] iommu/arm-smmu-v3: Unset corresponding STE fields when s2_cfg is NULL Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 13:13 ` Robin Murphy
2023-03-09 13:13 ` Robin Murphy
2023-03-09 18:24 ` Shameerali Kolothum Thodi
2023-03-09 18:24 ` Shameerali Kolothum Thodi
2023-03-10 1:54 ` Nicolin Chen
2023-03-10 1:54 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 07/14] iommu/arm-smmu-v3: Add STRTAB_STE_0_CFG_NESTED for 2-stage translation Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 08/14] iommu/arm-smmu-v3: Prepare for nested domain support Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-10 20:39 ` Robin Murphy
2023-03-10 20:39 ` Robin Murphy
2023-03-11 12:40 ` Nicolin Chen
2023-03-11 12:40 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 09/14] iommu/arm-smmu-v3: Implement arm_smmu_get_unmanaged_domain Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 10/14] iommu/arm-smmu-v3: Pass in user_cfg to arm_smmu_domain_finalise Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 11/14] iommu/arm-smmu-v3: Add arm_smmu_domain_alloc_user Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-24 15:28 ` Eric Auger
2023-03-24 15:28 ` Eric Auger
2023-03-24 17:40 ` Nicolin Chen
2023-03-24 17:40 ` Nicolin Chen
2023-03-24 17:50 ` Jason Gunthorpe
2023-03-24 17:50 ` Jason Gunthorpe
2023-03-24 18:00 ` Nicolin Chen
2023-03-24 18:00 ` Nicolin Chen
2023-03-24 15:33 ` Eric Auger
2023-03-24 15:33 ` Eric Auger
2023-03-24 17:43 ` Nicolin Chen
2023-03-24 17:43 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 12/14] iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED type of allocations Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 13:20 ` Robin Murphy
2023-03-09 13:20 ` Robin Murphy
2023-03-09 14:28 ` Robin Murphy
2023-03-09 14:28 ` Robin Murphy
2023-03-10 1:34 ` Nicolin Chen
2023-03-10 1:34 ` Nicolin Chen
2023-03-24 15:44 ` Eric Auger
2023-03-24 15:44 ` Eric Auger
2023-03-24 16:30 ` Jason Gunthorpe
2023-03-24 16:30 ` Jason Gunthorpe
2023-03-24 17:50 ` Nicolin Chen
2023-03-24 17:50 ` Nicolin Chen
2023-03-24 17:51 ` Jason Gunthorpe
2023-03-24 17:51 ` Jason Gunthorpe
2023-03-24 17:55 ` Nicolin Chen
2023-03-24 17:55 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 13/14] iommu/arm-smmu-v3: Add CMDQ_OP_TLBI_NH_VAA and CMDQ_OP_TLBI_NH_ALL Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 13:44 ` Robin Murphy
2023-03-09 13:44 ` Robin Murphy
2023-03-10 1:19 ` Nicolin Chen
2023-03-10 1:19 ` Nicolin Chen
2023-03-09 10:53 ` [PATCH v1 14/14] iommu/arm-smmu-v3: Add arm_smmu_cache_invalidate_user Nicolin Chen
2023-03-09 10:53 ` Nicolin Chen
2023-03-09 14:49 ` Robin Murphy
2023-03-09 14:49 ` Robin Murphy
2023-03-09 15:31 ` Jason Gunthorpe
2023-03-09 15:31 ` Jason Gunthorpe
2023-03-10 4:20 ` Nicolin Chen
2023-03-10 4:20 ` Nicolin Chen
2023-03-10 16:19 ` Jason Gunthorpe
2023-03-10 16:19 ` Jason Gunthorpe
2023-03-11 11:56 ` Nicolin Chen
2023-03-11 11:56 ` Nicolin Chen
2023-03-11 12:53 ` Nicolin Chen
2023-03-11 12:53 ` Nicolin Chen
2023-03-20 13:03 ` Jason Gunthorpe
2023-03-20 13:03 ` Jason Gunthorpe
2023-03-20 15:56 ` Nicolin Chen
2023-03-20 15:56 ` Nicolin Chen
2023-03-20 16:04 ` Jason Gunthorpe
2023-03-20 16:04 ` Jason Gunthorpe
2023-03-20 16:59 ` Nicolin Chen
2023-03-20 16:59 ` Nicolin Chen
2023-03-20 18:45 ` Jason Gunthorpe
2023-03-20 18:45 ` Jason Gunthorpe
2023-03-20 21:22 ` Nicolin Chen
2023-03-20 21:22 ` Nicolin Chen
2023-03-20 22:19 ` Jason Gunthorpe
2023-03-20 22:19 ` Jason Gunthorpe
2023-03-22 20:57 ` Nicolin Chen
2023-03-22 20:57 ` Nicolin Chen
2023-03-23 12:17 ` Jason Gunthorpe
2023-03-23 12:17 ` Jason Gunthorpe
2023-03-17 9:41 ` Tian, Kevin
2023-03-17 9:41 ` Tian, Kevin
2023-03-17 14:24 ` Nicolin Chen
2023-03-17 14:24 ` Nicolin Chen
2023-03-20 12:59 ` Jason Gunthorpe
2023-03-20 12:59 ` Jason Gunthorpe
2023-03-20 16:12 ` Nicolin Chen
2023-03-20 16:12 ` Nicolin Chen
2023-03-20 18:00 ` Jason Gunthorpe
2023-03-20 18:00 ` Jason Gunthorpe
2023-03-21 8:34 ` Tian, Kevin
2023-03-21 8:34 ` Tian, Kevin
2023-03-21 11:48 ` Jason Gunthorpe
2023-03-21 11:48 ` Jason Gunthorpe
2023-03-22 6:42 ` Nicolin Chen
2023-03-22 6:42 ` Nicolin Chen
2023-03-22 12:43 ` Jason Gunthorpe
2023-03-22 12:43 ` Jason Gunthorpe
2023-03-22 17:11 ` Nicolin Chen
2023-03-22 17:11 ` Nicolin Chen
2023-03-22 17:28 ` Jason Gunthorpe
2023-03-22 17:28 ` Jason Gunthorpe
2023-03-22 19:21 ` Nicolin Chen
2023-03-22 19:21 ` Nicolin Chen
2023-03-22 19:41 ` Jason Gunthorpe
2023-03-22 19:41 ` Jason Gunthorpe
2023-03-22 20:43 ` Nicolin Chen
2023-03-22 20:43 ` Nicolin Chen
2023-03-23 12:16 ` Jason Gunthorpe
2023-03-23 12:16 ` Jason Gunthorpe
2023-03-23 18:13 ` Nicolin Chen
2023-03-23 18:13 ` Nicolin Chen
2023-03-23 18:27 ` Jason Gunthorpe
2023-03-23 18:27 ` Jason Gunthorpe
2023-03-24 9:02 ` Tian, Kevin
2023-03-24 9:02 ` Tian, Kevin
2023-03-24 14:57 ` Jason Gunthorpe
2023-03-24 14:57 ` Jason Gunthorpe
2023-03-24 17:35 ` Nicolin Chen
2023-03-24 17:35 ` Nicolin Chen
2023-03-28 3:03 ` Tian, Kevin
2023-03-28 3:03 ` Tian, Kevin
2023-03-24 8:47 ` Tian, Kevin
2023-03-24 8:47 ` Tian, Kevin
2023-03-24 14:44 ` Jason Gunthorpe
2023-03-24 14:44 ` Jason Gunthorpe
2023-03-28 2:48 ` Tian, Kevin
2023-03-28 2:48 ` Tian, Kevin
2023-03-28 12:26 ` Jason Gunthorpe
2023-03-28 12:26 ` Jason Gunthorpe
2023-03-31 8:09 ` Tian, Kevin
2023-03-31 8:09 ` Tian, Kevin
2023-03-17 9:24 ` Tian, Kevin
2023-03-17 9:24 ` Tian, Kevin
2023-03-10 3:51 ` Nicolin Chen
2023-03-10 3:51 ` Nicolin Chen
2023-03-10 17:53 ` Robin Murphy
2023-03-10 17:53 ` Robin Murphy
2023-03-10 18:49 ` Jason Gunthorpe
2023-03-10 18:49 ` Jason Gunthorpe
2023-03-11 12:38 ` Nicolin Chen
2023-03-11 12:38 ` Nicolin Chen
2023-03-13 13:07 ` Robin Murphy
2023-03-13 13:07 ` Robin Murphy
2023-03-16 0:01 ` Nicolin Chen
2023-03-16 0:01 ` Nicolin Chen
2023-03-16 14:58 ` Robin Murphy
2023-03-16 14:58 ` Robin Murphy
2023-03-16 21:09 ` Nicolin Chen
2023-03-16 21:09 ` Nicolin Chen
2023-03-20 1:32 ` Nicolin Chen
2023-03-20 1:32 ` Nicolin Chen
2023-03-20 13:11 ` Jason Gunthorpe
2023-03-20 13:11 ` Jason Gunthorpe
2023-03-20 15:28 ` Nicolin Chen
2023-03-20 15:28 ` Nicolin Chen
2023-03-20 16:01 ` Jason Gunthorpe
2023-03-20 16:01 ` Jason Gunthorpe
2023-03-20 16:35 ` Nicolin Chen
2023-03-20 16:35 ` Nicolin Chen
2023-03-20 18:07 ` Jason Gunthorpe
2023-03-20 18:07 ` Jason Gunthorpe
2023-03-20 20:46 ` Nicolin Chen
2023-03-20 20:46 ` Nicolin Chen
2023-03-20 22:14 ` Jason Gunthorpe
2023-03-20 22:14 ` Jason Gunthorpe
2023-03-22 5:14 ` Nicolin Chen
2023-03-22 5:14 ` Nicolin Chen
2023-03-24 8:55 ` Tian, Kevin
2023-03-24 8:55 ` Tian, Kevin
2023-03-17 9:47 ` Tian, Kevin
2023-03-17 9:47 ` Tian, Kevin
2023-03-17 14:16 ` Nicolin Chen
2023-03-17 14:16 ` Nicolin Chen
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