Re: [PATCH for-5.0 v11 00/20] VIRTIO-IOMMU device

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Nov 22, 2019 at 07:29:23PM +0100, Eric Auger wrote:
> This series implements the QEMU virtio-iommu device.
> 
> This matches the v0.12 spec and the corresponding virtio-iommu
> driver upstreamed in 5.3.
> 
> The pci proxy for the virtio-iommu device is instantiated using
> "-device virtio-iommu-pci". This series still relies on ACPI IORT/DT
> integration. Note the ACPI IORT integration is not yet upstreamed
> and testing needs to be based on Jean-Philippe's additional
> kernel patches [1].

Or the config space approach? I really liked that one.

> 
> Work is ongoing to remove IORT adherence and allow the
> bindings between the IOMMU and the root complex to be defined
> and written into the PCI device configuration space. The outcome
> of this work is uncertain at this stage though. See [2].
> 
> So only patches 1-11 fully rely on upstreamed kernel code. Others
> should be considered as RFC.
> 
> This respin allows people to test on ARM and x86. It also
> brings migration support (tested on ARM) and various cleanups.
> Reserved regions are now passed through an array of properties.
> A libqos test also is introduced to test the virtio-iommu API.
> 
> Note integration with vhost devices and vfio devices is not part
> of this series. Please follow Bharat's respins [3].
> 
> The 1st Patch ("migration: Support QLIST migration") was sent
> separately [4].
> 
> Best Regards
> 
> Eric
> 
> This series can be found at:
> https://github.com/eauger/qemu/tree/v4.2-rc2-virtio-iommu-v11
> 
> [1] kernel branch to be used for guest
>     https://github.com/eauger/linux/tree/v5.4-rc8-virtio-iommu-iort
> [2] [RFC 00/13] virtio-iommu on non-devicetree platforms
> [3] VFIO/VHOST integration is not part of this series. Please follow
>     [PATCH RFC v5 0/5] virtio-iommu: VFIO integration respins
> [4] [PATCH v6] migration: Support QLIST migration
> 
> Testing:
> - tested with guest using virtio-net-pci
>   (,vhost=off,iommu_platform,disable-modern=off,disable-legacy=on)
>   and virtio-blk-pci
> - migration on ARM
> - on x86 PC machine I get some AHCI non translated transactions,
>   very early. This does not prevent the guest from boot and behaving
>   properly. Warnings look like:
> qemu-system-x86_64: virtio_iommu_translate sid=250 is not known!!
> qemu-system-x86_64: no buffer available in event queue to report event
> qemu-system-x86_64: AHCI: Failed to start FIS receive engine: bad FIS
> receive buffer address
> 
> History:
> 
> v10 -> v11:
> - introduce virtio_iommu_handle_req macro
> - migration support
> - introduce DEFINE_PROP_INTERVAL and pass reserved regions
>   through an array of those
> - domain gtree simplification
> 
> v9 -> v10:
> - rebase on 4.1.0-rc2, compliance with 0.12 spec
> - removed ACPI part
> - cleanup (see individual change logs)
> - moved to a PATCH series
> 
> v8 -> v9:
> - virtio-iommu-pci device needs to be instantiated from the command
>   line (RID is not imposed anymore).
> - tail structure properly initialized
> 
> v7 -> v8:
> - virtio-iommu-pci added
> - virt instantiation modified
> - DT and ACPI modified to exclude the iommu RID from the mapping
> - VIRTIO_IOMMU_F_BYPASS, VIRTIO_F_VERSION_1 features exposed
> 
> v6 -> v7:
> - rebase on qemu 3.0.0-rc3
> - minor update against v0.7
> - fix issue with EP not on pci.0 and ACPI probing
> - change the instantiation method
> 
> v5 -> v6:
> - minor update against v0.6 spec
> - fix g_hash_table_lookup in virtio_iommu_find_add_as
> - replace some error_reports by qemu_log_mask(LOG_GUEST_ERROR, ...)
> 
> v4 -> v5:
> - event queue and fault reporting
> - we now return the IOAPIC MSI region if the virtio-iommu is instantiated
>   in a PC machine.
> - we bypass transactions on MSI HW region and fault on reserved ones.
> - We support ACPI boot with mach-virt (based on IORT proposal)
> - We moved to the new driver naming conventions
> - simplified mach-virt instantiation
> - worked around the disappearing of pci_find_primary_bus
> - in virtio_iommu_translate, check the dev->as is not NULL
> - initialize as->device_list in virtio_iommu_get_as
> - initialize bufstate.error to false in virtio_iommu_probe
> 
> v3 -> v4:
> - probe request support although no reserved region is returned at
>   the moment
> - unmap semantics less strict, as specified in v0.4
> - device registration, attach/detach revisited
> - split into smaller patches to ease review
> - propose a way to inform the IOMMU mr about the page_size_mask
>   of underlying HW IOMMU, if any
> - remove warning associated with the translation of the MSI doorbell
> 
> v2 -> v3:
> - rebase on top of 2.10-rc0 and especially
>   [PATCH qemu v9 0/2] memory/iommu: QOM'fy IOMMU MemoryRegion
> - add mutex init
> - fix as->mappings deletion using g_tree_ref/unref
> - when a dev is attached whereas it is already attached to
>   another address space, first detach it
> - fix some error values
> - page_sizes = TARGET_PAGE_MASK;
> - I haven't changed the unmap() semantics yet, waiting for the
>   next virtio-iommu spec revision.
> 
> v1 -> v2:
> - fix redefinition of viommu_as typedef
> 
> 
> 
> Eric Auger (20):
>   migration: Support QLIST migration
>   virtio-iommu: Add skeleton
>   virtio-iommu: Decode the command payload
>   virtio-iommu: Add the iommu regions
>   virtio-iommu: Endpoint and domains structs and helpers
>   virtio-iommu: Implement attach/detach command
>   virtio-iommu: Implement map/unmap
>   virtio-iommu: Implement translate
>   virtio-iommu: Implement fault reporting
>   virtio-iommu-pci: Add virtio iommu pci support
>   hw/arm/virt: Add the virtio-iommu device tree mappings
>   qapi: Introduce DEFINE_PROP_INTERVAL
>   virtio-iommu: Implement probe request
>   virtio-iommu: Handle reserved regions in the translation process
>   virtio-iommu-pci: Add array of Interval properties
>   hw/arm/virt-acpi-build: Introduce fill_iort_idmap helper
>   hw/arm/virt-acpi-build: Add virtio-iommu node in IORT table
>   virtio-iommu: Support migration
>   pc: Add support for virtio-iommu-pci
>   tests: Add virtio-iommu test
> 
>  hw/arm/virt-acpi-build.c         |  91 ++-
>  hw/arm/virt.c                    |  53 +-
>  hw/core/qdev-properties.c        |  90 +++
>  hw/i386/acpi-build.c             |  72 +++
>  hw/i386/pc.c                     |  15 +-
>  hw/virtio/Kconfig                |   5 +
>  hw/virtio/Makefile.objs          |   2 +
>  hw/virtio/trace-events           |  22 +
>  hw/virtio/virtio-iommu-pci.c     |  91 +++
>  hw/virtio/virtio-iommu.c         | 952 +++++++++++++++++++++++++++++++
>  include/exec/memory.h            |   6 +
>  include/hw/acpi/acpi-defs.h      |  21 +-
>  include/hw/arm/virt.h            |   2 +
>  include/hw/i386/pc.h             |   2 +
>  include/hw/pci/pci.h             |   1 +
>  include/hw/qdev-properties.h     |   3 +
>  include/hw/virtio/virtio-iommu.h |  67 +++
>  include/migration/vmstate.h      |  21 +
>  include/qemu/queue.h             |  39 ++
>  include/qemu/typedefs.h          |   1 +
>  migration/trace-events           |   5 +
>  migration/vmstate-types.c        |  70 +++
>  qdev-monitor.c                   |   1 +
>  tests/Makefile.include           |   2 +
>  tests/libqos/virtio-iommu.c      | 177 ++++++
>  tests/libqos/virtio-iommu.h      |  45 ++
>  tests/test-vmstate.c             | 170 ++++++
>  tests/virtio-iommu-test.c        | 261 +++++++++
>  28 files changed, 2253 insertions(+), 34 deletions(-)
>  create mode 100644 hw/virtio/virtio-iommu-pci.c
>  create mode 100644 hw/virtio/virtio-iommu.c
>  create mode 100644 include/hw/virtio/virtio-iommu.h
>  create mode 100644 tests/libqos/virtio-iommu.c
>  create mode 100644 tests/libqos/virtio-iommu.h
>  create mode 100644 tests/virtio-iommu-test.c
> 
> -- 
> 2.20.1