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From: Zenghui Yu <yuzenghui@huawei.com>
To: Liu Yi L <yi.l.liu@intel.com>, <qemu-devel@nongnu.org>,
	<alex.williamson@redhat.com>, <peterx@redhat.com>,
	<jasowang@redhat.com>
Cc: jean-philippe@linaro.org, kevin.tian@intel.com,
	kvm@vger.kernel.org, mst@redhat.com, jun.j.tian@intel.com,
	eric.auger@redhat.com, yi.y.sun@intel.com,
	wanghaibin.wang@huawei.com, pbonzini@redhat.com,
	david@gibson.dropbear.id.au, hao.wu@intel.com
Subject: Re: [RFC v10 00/25] intel_iommu: expose Shared Virtual Addressing to VMs
Date: Thu, 25 Feb 2021 22:14:22 +0800	[thread overview]
Message-ID: <c7179970-731c-c40e-45e6-ad3a9f921af3@huawei.com> (raw)
In-Reply-To: <1599735398-6829-1-git-send-email-yi.l.liu@intel.com>

Hi Yi,

On 2020/9/10 18:56, Liu Yi L wrote:
> The high-level architecture for SVA virtualization is as below, the key
> design of vSVA support is to utilize the dual-stage IOMMU translation (
> also known as IOMMU nesting translation) capability in host IOMMU.
> 
>      .-------------.  .---------------------------.
>      |   vIOMMU    |  | Guest process CR3, FL only|
>      |             |  '---------------------------'
>      .----------------/
>      | PASID Entry |--- PASID cache flush -
>      '-------------'                       |
>      |             |                       V
>      |             |                CR3 in GPA
>      '-------------'
> Guest
> ------| Shadow |--------------------------|--------
>        v        v                          v
> Host
>      .-------------.  .----------------------.
>      |   pIOMMU    |  | Bind FL for GVA-GPA  |
>      |             |  '----------------------'
>      .----------------/  |
>      | PASID Entry |     V (Nested xlate)
>      '----------------\.------------------------------.
>      |             ||SL for GPA-HPA, default domain|
>      |             |   '------------------------------'
>      '-------------'

A silly question: With nested mode, do we need to setup the second level
mappings (GPA->HPA) for devices before vm startup? If so, can you please
point me to the piece of code that achieves it?

On Arm, we setup the stage-2 mapping via the new prereg_listener [1].

[1] 
https://patchwork.kernel.org/project/qemu-devel/patch/20210225105233.650545-15-eric.auger@redhat.com/


Thanks,
Zenghui


      parent reply	other threads:[~2021-02-25 14:15 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-10 10:56 [RFC v10 00/25] intel_iommu: expose Shared Virtual Addressing to VMs Liu Yi L
2020-09-10 10:56 ` [RFC v10 01/25] scripts/update-linux-headers: Import iommu.h Liu Yi L
2020-09-10 10:56 ` [RFC v10 02/25] header file update VFIO/IOMMU vSVA APIs kernel 5.9-rc2 Liu Yi L
2020-09-10 10:56 ` [RFC v10 03/25] hw/pci: modify pci_setup_iommu() to set PCIIOMMUOps Liu Yi L
2020-09-10 10:56 ` [RFC v10 04/25] hw/pci: introduce pci_device_get_iommu_attr() Liu Yi L
2020-09-10 10:56 ` [RFC v10 05/25] intel_iommu: add get_iommu_attr() callback Liu Yi L
2020-09-10 10:56 ` [RFC v10 06/25] vfio: pass nesting requirement into vfio_get_group() Liu Yi L
2020-09-10 10:56 ` [RFC v10 07/25] vfio: check VFIO_TYPE1_NESTING_IOMMU support Liu Yi L
2020-09-10 10:56 ` [RFC v10 08/25] hw/iommu: introduce HostIOMMUContext Liu Yi L
2020-09-10 10:56 ` [RFC v10 09/25] hw/pci: introduce pci_device_set/unset_iommu_context() Liu Yi L
2020-09-10 10:56 ` [RFC v10 10/25] intel_iommu: add set/unset_iommu_context callback Liu Yi L
2020-09-10 10:56 ` [RFC v10 11/25] vfio/common: provide PASID alloc/free hooks Liu Yi L
2020-09-10 10:56 ` [RFC v10 12/25] vfio: init HostIOMMUContext per-container Liu Yi L
2020-09-10 10:56 ` [RFC v10 13/25] intel_iommu: add virtual command capability support Liu Yi L
2020-09-10 10:56 ` [RFC v10 14/25] intel_iommu: process PASID cache invalidation Liu Yi L
2020-09-10 10:56 ` [RFC v10 15/25] intel_iommu: add PASID cache management infrastructure Liu Yi L
2020-09-10 10:56 ` [RFC v10 16/25] vfio: add bind stage-1 page table support Liu Yi L
2020-09-10 10:56 ` [RFC v10 17/25] intel_iommu: sync IOMMU nesting cap info for assigned devices Liu Yi L
2020-09-10 10:56 ` [RFC v10 18/25] intel_iommu: bind/unbind guest page table to host Liu Yi L
2020-09-10 10:56 ` [RFC v10 19/25] intel_iommu: replay pasid binds after context cache invalidation Liu Yi L
2020-09-10 10:56 ` [RFC v10 20/25] intel_iommu: do not pass down pasid bind for PASID #0 Liu Yi L
2020-09-10 10:56 ` [RFC v10 21/25] vfio: add support for flush iommu stage-1 cache Liu Yi L
2020-09-10 10:56 ` [RFC v10 22/25] intel_iommu: process PASID-based iotlb invalidation Liu Yi L
2020-09-10 10:56 ` [RFC v10 23/25] intel_iommu: propagate PASID-based iotlb invalidation to host Liu Yi L
2020-09-10 10:56 ` [RFC v10 24/25] intel_iommu: process PASID-based Device-TLB invalidation Liu Yi L
2020-09-10 10:56 ` [RFC v10 25/25] intel_iommu: modify x-scalable-mode to be string option Liu Yi L
2021-02-25 14:14 ` Zenghui Yu [this message]

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