[Xen-bugs] [Bug 1673] New: 3GB memory restriction for pv domU with PCI

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1673

           Summary: 3GB memory restriction for pv domU with PCI
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Linux-pv_ops domU
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: bruce.edge@xxxxxxxxx


One cannot do PCI passthrough in PV guests when guest has more than 3GB. 

If the memory parameter in the VM's .cfg file is 4GB or more
memory          = 4096

and it has PCI passthrough devices:
pci = ['0000:01:00.0@10', '0000:01:00.1@11']

The VM start contains these errors:

[    0.295419] pci 0000:00:01.0: address space collision: [mem
0xfa8f8000-0xfa8fffff 64bit] conflicts with System RAM [mem
0x00100000-0xffffffff]
[    0.295419] pcifront pci-0: Could not claim resource 0000:00:01.0/4! Device
offline. Try giving less than 4GB to domain.
[    0.354713] pcifront pci-0: claiming resource 0000:00:01.1/0
[    0.354721] pci 0000:00:01.1: address space collision: [mem
0xfa700000-0xfa7fffff 64bit] conflicts with System RAM [mem
0x00100000-0xffffffff]
[    0.354730] pcifront pci-0: Could not claim resource 0000:00:01.1/0! Device
offline. Try giving less than 4GB to domain.
[    0.354738] pcifront pci-0: claiming resource 0000:00:01.1/2
[    0.354744] pcifront pci-0: claiming resource 0000:00:01.1/3
[    0.354749] pcifront pci-0: claiming resource 0000:00:01.1/4
[    0.354755] pci 0000:00:01.1: address space collision: [mem
0xfa8f0000-0xfa8f7fff 64bit] conflicts with System RAM [mem
0x00100000-0xffffffff]
[    0.354765] pcifront pci-0: Could not claim resource 0000:00:01.1/4! Device
offline. Try giving less than 4GB to domain.


The complete details are in this thread:
http://www.gossamer-threads.com/lists/xen/devel/187533


I don't know what frame of reference the severity field is for. I marked this
as major because it's of major importance to us. Without this, we have to use
HVM mode which no one wants to do.


-- 
Configure bugmail: 
http://bugzilla.xensource.com/bugzilla/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.

_______________________________________________
Xen-bugs mailing list
Xen-bugs@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-bugs