virt: acrn: Introduce PCI configuration space PIO accesses combiner

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A User VM can access its virtual PCI configuration spaces via port IO
approach, which has two following steps:
 1) writes address into port 0xCF8
 2) put/get data in/from port 0xCFC

To distribute a complete PCI configuration space access one time, HSM
need to combine such two accesses together.

Combine two paired PIO I/O requests into one PCI I/O request and
continue the I/O request distribution.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-11-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Shuo Liu 2021-02-07 11:10:32 +08:00 • committed by Greg Kroah-Hartman

parent 72f293de3f

commit 3c4c331667

3 changed files with 105 additions and 0 deletions

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include/uapi/linux/acrn.h

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