[Xen-devel] [PATCH 0/4] dom0 linux: Reserve device for guest with device path

[Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>]

This series of patches add the function to dom0 linux to reserve PCI
device for guest domain with device path. Following is example of device
path.

        PNP0A03:100-1c.1-00.0


Currently if we assign PCI device to guest domain, we have to specify
PCI device with "pciback.hide=" boot parameter. If PCI device has small
memory resource and BIOS does not assign page-aligned memory resource,
we have to specify PCI device with "reassigndev=" boot parameter also.

"pciback.hide=" and "reassigndev=" use SBDF(Segment#, Bus#, Device#,
Function#). Segment# and Bus# can be changed at boot time. So they are
not suitable for specifying PCI device at boot time.


My patches integrate "pciback.hide=" and "reassigndev=" into one
"guestdev=" boot parameter. So we have to specify only one boot
parameter. The format of device path is following.

        <hid>[:<uid>]-<dev>.<func>[-<dev>.<func>[...]]

Device path is not changed at boot time. So it is suitable for
specifying PCI device at boot time.


My patches add "reassign_resources" boot parameter too. If reassignment
is needed, please set it.


Following is example of dom0 linux's boot parameter.

        reassign_resources guestdev=PNP0A03:100-1c.1-00.0,PNP0A03:100-1d.7


The series consists of following patches.

1. Expose HID,UID,SEG,BBN of PCI root bridge via sysfs.
2. Add "guestdev=" boot parameter.
3. Bind PCI back driver to PCI device specified by "guestdev=".
4. Cleanup function name relating resource reassignment.


I will take a vacation from 27 Dec. to 4 Jan. I will not be able to
respond to a mail.

Thanks,
--
Yuji Shimada.


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