PCI ROM is the firmware specific to PCI device and it is provided by
the device vendor. The PCI rom resides in 0x30 offset of PCI config space.
This can be used to check whether the PCI rom exists. And when it exists,
it can load the firmware from the addr that is obtained from ROM bar addr.
For the user-vm, it will try to load the rom_file for the given PCI device and
enable the VM to access the firmware that is defined in rom_file.
BTW: The emulated rom_file is converted from efi image by using EfiRom. It has
no dependency on the ROM bar of physical PCI devices. Of course if the physical
PCI devices supports the ROM bar, the rom_file can also be dumped from the PCI
rom.
Now this is limited to PCI display device.
V2->V3: Add the function of pci_load_rombar/pci_release_rombar to handle the
rombar in course of passthrough_init/deinit.
Tracked-On: #8175
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Acked-by: Wang Yu <yu1.wang@intel.com>
If PTM can be enabled on passthru device, a virtual root port
is added to vm to act as ptm root. And the passthru device is
connected to the virtual root port instead of the virtual host bridge.
Tracked-On: #5915
Signed-off-by: Rong Liu <rong.l.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This patch probes whether hw supports ptm. It is used to check whether ptm
can be enabled on the passthru pci device. It checks whether passthru
device support PTM requestor capability, then check whether its upstream
root port support PTM root role. Errors are reported to user if sanity
check fails.
Tracked-On: #5915
Signed-off-by: Rong Liu <rong.l.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
Zhao Yakui