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For vfio-pci, if the region support MMAP then it should support both mmap and normal file access. The user-space is free to choose which is being used. For qemu, we just need add 'x-no-mmap=on' for vfio-pci option. Currently GVTg only support MMAP for BAR2. So GVTg will not work when user turn on x-no-mmap option. This patch added file style access for BAR2, aka the GPU aperture. We map the entire aperture partition of active vGPU to kernel space when guest driver try to enable PCI Memory Space. Then we redirect the file RW operation from kvmgt to this mapped area. Link: https://bugzilla.redhat.com/show_bug.cgi?id=1458032 Signed-off-by: Changbin Du <changbin.du@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.