Re: [PATCH ats_vtd v5 00/22] ATS support for VT-d

[Michael S. Tsirkin]

On Tue, Jul 02, 2024 at 05:57:57AM +0000, CLEMENT MATHIEU--DRIF wrote:
> 
> 
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> From: Michael S. Tsirkin <mst@redhat.com>
> Sent: 01 July 2024 22:02
> To: CLEMENT MATHIEU--DRIF <clement.mathieu--drif@eviden.com>
> Cc: qemu-devel@nongnu.org <qemu-devel@nongnu.org>; jasowang@redhat.com
> <jasowang@redhat.com>; zhenzhong.duan@intel.com <zhenzhong.duan@intel.com>;
> kevin.tian@intel.com <kevin.tian@intel.com>; yi.l.liu@intel.com
> <yi.l.liu@intel.com>; joao.m.martins@oracle.com <joao.m.martins@oracle.com>;
> peterx@redhat.com <peterx@redhat.com>
> Subject: Re: [PATCH ats_vtd v5 00/22] ATS support for VT-d
>  
> Caution: External email. Do not open attachments or click links, unless this
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> 
> 
> On Mon, Jun 03, 2024 at 05:59:38AM +0000, CLEMENT MATHIEU--DRIF wrote:
> > From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
> >
> > This series belongs to a list of series that add SVM support for VT-d.
> >
> > As a starting point, we use the series called 'intel_iommu: Enable stage-1
> translation' (rfc2) by Zhenzhong Duan and Yi Liu.
> >
> > Here we focus on the implementation of ATS support in the IOMMU and on a
> PCI-level
> > API for ATS to be used by virtual devices.
> >
> > This work is based on the VT-d specification version 4.1 (March 2023).
> > Here is a link to a GitHub repository where you can find the following
> elements :
> >     - Qemu with all the patches for SVM
> >         - ATS
> >         - PRI
> >         - Device IOTLB invalidations
> >         - Requests with already translated addresses
> >     - A demo device
> >     - A simple driver for the demo device
> >     - A userspace program (for testing and demonstration purposes)
> >
> > https://eur06.safelinks.protection.outlook.com/?url=
> https%3A%2F%2Fgithub.com%2FBullSequana%2FQemu-in-guest-SVM-demo&data=
> 05%7C02%7Cclement.mathieu--drif%40eviden.com%7Cf5759aefcc5f4e7d4e6c08dc9a08d29a%7C7d1c77852d8a437db8421ed5d8fbe00a%7C0%7C0%7C638554609882544195%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C
> &sdata=2Gza1VD7hKr1Sx3fOLoRh6tk3taSPKTn5nfimhPLz70%3D&reserved=0
> 
> I will merge, but could you please resend this using git format-patch
> for formatting?  The patches have trailing CRs and don't show which sha1
> they are for, which makes re-applying them after each change painful.
> 
> 
> 
> Hi Michael,
> I sent the series again without the trailing new line.
> Tell me if it's better.
> 
> Is Zhenzhong's FLTS series merged? If not, it might the cause of the sha1
> problem you are facing

I don't think I have FLTS in any queue.

If your series has a dependency please specify this in
the cover letter.

Alternatively just include the dependency in the posting.





> Thanks
> >cmd
> 
> 
> > v2
> >     - handle huge pages better by detecting the page table level at which 
> > the
> translation errors occur
> >     - Changes after review by ZhenZhong Duan :
> >       - Set the access bit after checking permissions
> >       - helper for PASID and ATS : make the commit message more accurate
> ('present' replaced with 'enabled')
> >       - pcie_pasid_init: add PCI_PASID_CAP_WIDTH_SHIFT and use it instead of
> PCI_EXT_CAP_PASID_SIZEOF for shifting the pasid width when preparing the
> capability register
> >       - pci: do not check pci_bus_bypass_iommu after calling
> pci_device_get_iommu_bus_devfn
> >       - do not alter formatting of IOMMUTLBEntry declaration
> >       - vtd_iova_fl_check_canonical : directly use s->aw_bits instead of aw
> for the sake of clarity
> >
> > v3
> >     - rebase on new version of Zhenzhong's flts implementation
> >     - fix the atc lookup operation (check the mask before returning an 
> > entry)
> >     - add a unit test for the ATC
> >     - store a user pointer in the iommu notifiers to simplify the
> implementation of svm devices
> >     Changes after review by Zhenzhong :
> >       - store the input pasid instead of rid2pasid when returning an entry
> after a translation
> >       - split the ATC implementation and its unit tests
> >
> > v4
> >     Changes after internal review
> >       - Fix the nowrite optimization, an ATS translation without the nowrite
> flag should not fail when the write permission is not set
> >
> > v5
> >     Changes after review by Philippe :
> >       - change the type of 'level' to unsigned in vtd_lookup_iotlb
> >
> >
> >
> > Clément Mathieu--Drif (22):
> >   intel_iommu: fix FRCD construction macro.
> >   intel_iommu: make types match
> >   intel_iommu: return page walk level even when the translation fails
> >   intel_iommu: do not consider wait_desc as an invalid descriptor
> >   memory: add permissions in IOMMUAccessFlags
> >   pcie: add helper to declare PASID capability for a pcie device
> >   pcie: helper functions to check if PASID and ATS are enabled
> >   intel_iommu: declare supported PASID size
> >   pci: cache the bus mastering status in the device
> >   pci: add IOMMU operations to get address spaces and memory regions
> >     with PASID
> >   memory: store user data pointer in the IOMMU notifiers
> >   pci: add a pci-level initialization function for iommu notifiers
> >   intel_iommu: implement the get_address_space_pasid iommu operation
> >   intel_iommu: implement the get_memory_region_pasid iommu operation
> >   memory: Allow to store the PASID in IOMMUTLBEntry
> >   intel_iommu: fill the PASID field when creating an instance of
> >     IOMMUTLBEntry
> >   atc: generic ATC that can be used by PCIe devices that support SVM
> >   atc: add unit tests
> >   memory: add an API for ATS support
> >   pci: add a pci-level API for ATS
> >   intel_iommu: set the address mask even when a translation fails
> >   intel_iommu: add support for ATS
> >
> >  hw/i386/intel_iommu.c                     | 142 +++++-
> >  hw/i386/intel_iommu_internal.h            |   6 +-
> >  hw/pci/pci.c                              | 127 +++++-
> >  hw/pci/pcie.c                             |  42 ++
> >  include/exec/memory.h                     |  51 ++-
> >  include/hw/i386/intel_iommu.h             |   2 +-
> >  include/hw/pci/pci.h                      | 101 +++++
> >  include/hw/pci/pci_device.h               |   1 +
> >  include/hw/pci/pcie.h                     |   9 +-
> >  include/hw/pci/pcie_regs.h                |   3 +
> >  include/standard-headers/linux/pci_regs.h |   1 +
> >  system/memory.c                           |  20 +
> >  tests/unit/meson.build                    |   1 +
> >  tests/unit/test-atc.c                     | 527 ++++++++++++++++++++++
> >  util/atc.c                                | 211 +++++++++
> >  util/atc.h                                | 117 +++++
> >  util/meson.build                          |   1 +
> >  17 files changed, 1330 insertions(+), 32 deletions(-)
> >  create mode 100644 tests/unit/test-atc.c
> >  create mode 100644 util/atc.c
> >  create mode 100644 util/atc.h
> >
> > --
> > 2.45.1
>