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On new platforms greater than QM_HW_V3, the migration region has been relocated from the VF to the PF. The VF's own configuration space is restored to the complete 64KB, and there is no need to divide the size of the BAR configuration space equally. The driver should be modified accordingly to adapt to the new hardware device. On the older hardware platform QM_HW_V3, the live migration configuration region is placed in the latter 32K portion of the VF's BAR2 configuration space. On the new hardware platform QM_HW_V4, the live migration configuration region also exists in the same 32K area immediately following the VF's BAR2, just like on QM_HW_V3. However, access to this region is now controlled by hardware. Additionally, a copy of the live migration configuration region is present in the PF's BAR2 configuration space. On the new hardware platform QM_HW_V4, when an older version of the driver is loaded, it behaves like QM_HW_V3 and uses the configuration region in the VF, ensuring that the live migration function continues to work normally. When the new version of the driver is loaded, it directly uses the configuration region in the PF. Meanwhile, hardware configuration disables the live migration configuration region in the VF's BAR2: reads return all 0xF values, and writes are silently ignored. Signed-off-by: Longfang Liu <liulongfang@huawei.com> Reviewed-by: Shameer Kolothum <shameerkolothum@gmail.com> Link: https://lore.kernel.org/r/20251030015744.131771-3-liulongfang@huawei.com Signed-off-by: Alex Williamson <alex@shazbot.org> |
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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 reStructuredText markup notation.
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.