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SubjectRe: [PATCH v2 0/5] Pass zPCI hardware information via VFIO
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On 10/2/20 4:00 PM, Matthew Rosato wrote:
> This patchset provides a means by which hardware information about the
> underlying PCI device can be passed up to userspace (ie, QEMU) so that
> this hardware information can be used rather than previously hard-coded
> assumptions. A new VFIO region type is defined which holds this
> information.
>
> A form of these patches saw some rounds last year but has been back-
> tabled for a while. The original work for this feature was done by Pierre
> Morel. I'd like to refresh the discussion on this and get this finished up
> so that we can move forward with better-supporting additional types of
> PCI-attached devices. The proposal here presents a completely different
> region mapping vs the prior approach, taking inspiration from vfio info
> capability chains to provide device CLP information in a way that allows
> for future expansion (new CLP features).
>
> This feature is toggled via the CONFIG_VFIO_PCI_ZDEV configuration entry.
>
> Changes from v1:
> - Added ACKs (thanks!)
> - Patch 2: Minor change:s/util_avail/util_str_avail/ per Niklas
> - Patch 3: removed __packed
> - Patch 3: rework various descriptions / comment blocks
> - New patch: MAINTAINERS hit to cover new files.
>

Link to latest QEMU patchset:
https://lists.gnu.org/archive/html/qemu-devel/2020-10/msg00673.html

> Matthew Rosato (5):
> s390/pci: stash version in the zpci_dev
> s390/pci: track whether util_str is valid in the zpci_dev
> vfio-pci/zdev: define the vfio_zdev header
> vfio-pci/zdev: use a device region to retrieve zPCI information
> MAINTAINERS: Add entry for s390 vfio-pci
>
> MAINTAINERS | 8 ++
> arch/s390/include/asm/pci.h | 4 +-
> arch/s390/pci/pci_clp.c | 2 +
> drivers/vfio/pci/Kconfig | 13 ++
> drivers/vfio/pci/Makefile | 1 +
> drivers/vfio/pci/vfio_pci.c | 8 ++
> drivers/vfio/pci/vfio_pci_private.h | 10 ++
> drivers/vfio/pci/vfio_pci_zdev.c | 242 ++++++++++++++++++++++++++++++++++++
> include/uapi/linux/vfio.h | 5 +
> include/uapi/linux/vfio_zdev.h | 118 ++++++++++++++++++
> 10 files changed, 410 insertions(+), 1 deletion(-)
> create mode 100644 drivers/vfio/pci/vfio_pci_zdev.c
> create mode 100644 include/uapi/linux/vfio_zdev.h
>

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