From: Joerg Roedel <joro@8bytes.org>
To: Jacob Pan <jacob.jun.pan@intel.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
kevin.tian@intel.com, "Michael S. Tsirkin" <mst@redhat.com>,
linux-pci@vger.kernel.org, jasowang@redhat.com,
virtualization@lists.linux-foundation.org,
iommu@lists.linux-foundation.org, sebastien.boeuf@intel.com,
bhelgaas@google.com, robin.murphy@arm.com
Subject: Re: [PATCH v2 1/3] iommu/virtio: Add topology description to virtio-iommu config space
Date: Wed, 4 Mar 2020 18:34:42 +0100 [thread overview]
Message-ID: <20200304173441.GB3315@8bytes.org> (raw)
In-Reply-To: <20200304074854.3ea958a1@jacob-XPS-13-9365>
On Wed, Mar 04, 2020 at 07:48:54AM -0800, Jacob Pan wrote:
> For emulated VT-d IOMMU, GIOVA can also be build as first level page
> tables then pass to the host IOMMU to bind. There is no need to shadow
> in this case, pIOMMU will do nested translation and walk guest page
> tables.
Right, but that requires hardware support. A pure software emulation of
VT-d requires the full shadow of the guest io-page-table.
> I thought we have the universal device properties to abstract DT and
> ACPI (via _DSD). Is that an option?
I don't know whether this was considered, Jean-Philippe?
Regards,
Joerg
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iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Jacob Pan <jacob.jun.pan@intel.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
kevin.tian@intel.com, linux-pci@vger.kernel.org,
jasowang@redhat.com, virtualization@lists.linux-foundation.org,
iommu@lists.linux-foundation.org, sebastien.boeuf@intel.com,
bhelgaas@google.com, robin.murphy@arm.com
Subject: Re: [PATCH v2 1/3] iommu/virtio: Add topology description to virtio-iommu config space
Date: Wed, 4 Mar 2020 18:34:42 +0100 [thread overview]
Message-ID: <20200304173441.GB3315@8bytes.org> (raw)
In-Reply-To: <20200304074854.3ea958a1@jacob-XPS-13-9365>
On Wed, Mar 04, 2020 at 07:48:54AM -0800, Jacob Pan wrote:
> For emulated VT-d IOMMU, GIOVA can also be build as first level page
> tables then pass to the host IOMMU to bind. There is no need to shadow
> in this case, pIOMMU will do nested translation and walk guest page
> tables.
Right, but that requires hardware support. A pure software emulation of
VT-d requires the full shadow of the guest io-page-table.
> I thought we have the universal device properties to abstract DT and
> ACPI (via _DSD). Is that an option?
I don't know whether this was considered, Jean-Philippe?
Regards,
Joerg
next prev parent reply other threads:[~2020-03-04 17:34 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 17:25 [PATCH v2 0/3] virtio-iommu on x86 and non-devicetree platforms Jean-Philippe Brucker
2020-02-28 17:25 ` Jean-Philippe Brucker
2020-02-28 17:25 ` [PATCH v2 1/3] iommu/virtio: Add topology description to virtio-iommu config space Jean-Philippe Brucker
2020-02-28 17:25 ` Jean-Philippe Brucker
2020-03-01 11:17 ` Michael S. Tsirkin
2020-03-01 11:17 ` Michael S. Tsirkin
2020-03-02 16:16 ` Joerg Roedel
2020-03-02 16:16 ` Joerg Roedel
2020-03-03 10:19 ` Auger Eric
2020-03-03 10:19 ` Auger Eric
2020-03-03 13:01 ` Joerg Roedel
2020-03-03 13:01 ` Joerg Roedel
2020-03-03 14:00 ` Michael S. Tsirkin
2020-03-03 14:00 ` Michael S. Tsirkin
2020-03-03 15:53 ` Joerg Roedel
2020-03-03 15:53 ` Joerg Roedel
2020-03-03 16:09 ` Michael S. Tsirkin
2020-03-03 16:09 ` Michael S. Tsirkin
2020-03-03 16:21 ` Auger Eric
2020-03-03 16:21 ` Auger Eric
2020-03-04 13:37 ` Joerg Roedel
2020-03-04 13:37 ` Joerg Roedel
2020-03-04 15:38 ` Jean-Philippe Brucker
2020-03-04 15:38 ` Jean-Philippe Brucker
2020-03-04 17:40 ` Joerg Roedel
2020-03-04 17:40 ` Joerg Roedel
2020-03-04 21:37 ` Jacob Pan (Jun)
2020-03-04 21:37 ` Jacob Pan (Jun)
2020-03-04 21:37 ` Jacob Pan (Jun)
2020-03-04 21:54 ` Joerg Roedel
2020-03-04 21:54 ` Joerg Roedel
2020-03-05 15:42 ` Michael S. Tsirkin
2020-03-05 15:42 ` Michael S. Tsirkin
2020-03-04 15:48 ` Jacob Pan
2020-03-04 15:48 ` Jacob Pan
2020-03-04 17:34 ` Joerg Roedel [this message]
2020-03-04 17:34 ` Joerg Roedel
2020-03-04 19:34 ` Michael S. Tsirkin
2020-03-04 19:34 ` Michael S. Tsirkin
2020-03-04 21:50 ` Joerg Roedel
2020-03-04 21:50 ` Joerg Roedel
2020-03-05 15:39 ` Michael S. Tsirkin
2020-03-05 15:39 ` Michael S. Tsirkin
2020-03-03 14:02 ` Michael S. Tsirkin
2020-03-03 14:02 ` Michael S. Tsirkin
2020-03-03 14:02 ` Michael S. Tsirkin
2020-03-05 8:07 ` Tian, Kevin
2020-03-05 8:07 ` Tian, Kevin
2020-03-11 17:48 ` Jean-Philippe Brucker
2020-03-11 17:48 ` Jean-Philippe Brucker
2020-03-11 21:48 ` Michael S. Tsirkin
2020-03-11 21:48 ` Michael S. Tsirkin
2020-04-13 13:22 ` Michael S. Tsirkin
2020-04-13 13:22 ` Michael S. Tsirkin
2020-04-21 7:31 ` Tian, Kevin
2020-04-21 7:31 ` Tian, Kevin
2020-08-21 8:39 ` Jean-Philippe Brucker
2020-08-21 8:39 ` Jean-Philippe Brucker
2020-08-21 8:39 ` Jean-Philippe Brucker
2020-02-28 17:25 ` [PATCH v2 2/3] PCI: Add DMA configuration for virtual platforms Jean-Philippe Brucker
2020-02-28 17:25 ` Jean-Philippe Brucker
2020-03-18 21:10 ` Bjorn Helgaas
2020-03-18 21:10 ` Bjorn Helgaas
2020-02-28 17:25 ` [PATCH v2 3/3] iommu/virtio: Enable x86 support Jean-Philippe Brucker
2020-02-28 17:25 ` Jean-Philippe Brucker
2020-02-29 14:23 ` kbuild test robot
2020-02-29 14:23 ` kbuild test robot
2020-02-29 14:23 ` kbuild test robot
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