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IGD is PCIe device and has extended configuration space. Checking the binary dump, we can see we have Caps located out of PCI compatible Configuration Space range. 0x000: 86 80 12 19 17 04 10 00 06 00 00 03 00 00 00 00 0x010: 04 00 00 10 08 00 00 00 0c 00 00 00 08 00 00 00 0x020: 00 00 00 00 00 00 00 00 00 00 00 00 28 10 b9 06 0x030: 00 f8 ff ff 40 00 00 00 00 00 00 00 0b 01 00 00 0x040: 09 70 0c 01 71 26 01 62 c8 00 04 84 00 00 00 00 0x050: c1 00 00 00 39 00 00 00 00 00 00 00 01 00 00 a2 0x060: 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 0x070: 10 ac 92 00 00 80 00 10 00 00 00 00 00 00 00 00 0x080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0a0: 00 00 00 00 00 00 00 00 00 00 00 00 05 d0 01 00 0x0b0: 18 00 e0 fe 00 00 00 00 00 00 00 00 00 00 00 00 0x0c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0d0: 01 00 22 00 00 80 00 00 00 00 00 00 00 00 00 00 0x0e0: 00 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 0x0f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x100: 1b 00 01 20 02 14 00 00 00 00 00 00 00 00 00 00 ... Currently, we only emulate the PCI compatible Configuration Space. This is okay if we attach vGPU to PCI bus. But when we attach to a PCI Express bus (when Qemu emulates a Intel Q35 chipset which has PCIe slot), it will not work. Extended Configuration Space is required for a PCIe device. This patch extended the virtual configuration space from 256 bytes to 4KB bytes. So we are to be a *real* PCIe device. And for the Extended CapList we keep same to physical GPU. Cc: Laszlo Ersek <lersek@redhat.com> Tested-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Changbin Du <changbin.du@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> |
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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.