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When Linux runs as a guest VM in Hyper-V and Hyper-V adds the virtual PCI bus to the guest, Hyper-V always provides unique PCI domain. commit4a9b0933bd("PCI: hv: Use device serial number as PCI domain") overrode unique domain with the serial number of the first device added to the virtual PCI bus. The reason for that patch was to have a consistent and short name for the device, but Hyper-V doesn't provide unique serial numbers. Using non-unique serial numbers as domain IDs leads to duplicate device addresses, which causes PCI bus registration to fail. commit0c195567a8("netvsc: transparent VF management") avoids the need for commit4a9b0933bd("PCI: hv: Use device serial number as PCI domain"). When scripts were used to configure VF devices, the name of the VF needed to be consistent and short, but with commit0c195567a8("netvsc: transparent VF management") all the setup is done in the kernel, and we do not need to maintain consistent name. Revert commit4a9b0933bd("PCI: hv: Use device serial number as PCI domain") so we can reliably support multiple devices being assigned to a guest. Tag the patch for stable kernels containing commit0c195567a8("netvsc: transparent VF management"). Fixes:4a9b0933bd("PCI: hv: Use device serial number as PCI domain") Signed-off-by: Sridhar Pitchai <sridhar.pitchai@microsoft.com> [lorenzo.pieralisi@arm.com: trimmed commit log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: stable@vger.kernel.org # v4.14+ Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.