[ kvm-Bugs-2847560 ] Guest hang with exhausted IRQ sources error if 8 VFs assigne

* [ kvm-Bugs-2847560 ] Guest hang with exhausted IRQ sources error if 8 VFs assigne
@ 2009-11-09  6:00 SourceForge.net
  0 siblings, 0 replies; 2+ messages in thread
From: SourceForge.net @ 2009-11-09  6:00 UTC (permalink / raw)
  To: noreply

Bugs item #2847560, was opened at 2009-08-30 22:58
Message generated for change (Settings changed) made by jiajun
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2847560&group_id=180599

Please note that this message will contain a full copy of the comment thread,
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Category: kernel
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Jiajun Xu (jiajun)
Assigned to: Nobody/Anonymous (nobody)
Summary: Guest hang with exhausted IRQ sources error if 8 VFs assigne

Initial Comment:
Environment:
------------
Host OS (ia32/ia32e/IA64): ia32e
Guest OS (ia32/ia32e/IA64): ia32e 
Guest OS Type (Linux/Windows): Linux
kvm.git Commit: 779cc54dbccaa3a00d70a9d61d090be5d9ccc903
qemu-kvm Commit: 9e3269181e9bc56feb43bcd4e8ce0b82cd543e65
Host Kernel Version: 2.6.31-rc5
Hardware: NHM-EP

Bug detailed description:
--------------------------
If boot a guest with 8 VFs assigned, guest will hang at stage of "Starting
udev:". And dmesg will shows that "kvm: exhaust allocatable IRQ sources!"

If boot a guest with 6 VFs assigned, guest can boot up and VF can work well in
guest.

Dmesg info:
########
pci-stub 0000:01:10.0: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:0
pci-stub 0000:01:10.1: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:1
pci-stub 0000:01:10.2: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:2
pci-stub 0000:01:10.3: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:3
pci-stub 0000:01:10.4: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:4
pci-stub 0000:01:10.5: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:5
pci-stub 0000:01:10.6: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:6
pci-stub 0000:01:10.7: enabling device (0000 -> 0002)
assign device: host bdf = 1:10:7
pci-stub 0000:01:10.0: irq 91 for MSI/MSI-X
pci-stub 0000:01:10.0: irq 92 for MSI/MSI-X
pci-stub 0000:01:10.0: irq 93 for MSI/MSI-X
pci-stub 0000:01:10.1: irq 97 for MSI/MSI-X
pci-stub 0000:01:10.1: irq 98 for MSI/MSI-X
pci-stub 0000:01:10.1: irq 99 for MSI/MSI-X
pci-stub 0000:01:10.2: irq 100 for MSI/MSI-X
pci-stub 0000:01:10.2: irq 101 for MSI/MSI-X
pci-stub 0000:01:10.2: irq 102 for MSI/MSI-X
pci-stub 0000:01:10.3: irq 103 for MSI/MSI-X
pci-stub 0000:01:10.3: irq 104 for MSI/MSI-X
pci-stub 0000:01:10.3: irq 105 for MSI/MSI-X
pci-stub 0000:01:10.4: irq 106 for MSI/MSI-X
pci-stub 0000:01:10.4: irq 107 for MSI/MSI-X
pci-stub 0000:01:10.4: irq 108 for MSI/MSI-X
pci-stub 0000:01:10.5: irq 112 for MSI/MSI-X
pci-stub 0000:01:10.5: irq 113 for MSI/MSI-X
pci-stub 0000:01:10.5: irq 114 for MSI/MSI-X
pci-stub 0000:01:10.6: irq 115 for MSI/MSI-X
pci-stub 0000:01:10.6: irq 116 for MSI/MSI-X
pci-stub 0000:01:10.6: irq 117 for MSI/MSI-X
kvm: exhaust allocatable IRQ sources!
########

----------------------------------------------------------------------

>Comment By: Jiajun Xu (jiajun)
Date: 2009-11-08 22:00

Message:
The bug is fixed by commit kvm.git commit,
99c52eb29f6f013b7a9f5c25439091a2fad0fd80:

commit 99c52eb29f6f013b7a9f5c25439091a2fad0fd80
Author: Marcelo Tosatti <mtosatti@redhat.com>
Date:   Sat Oct 17 22:47:23 2009 -0300

    KVM: fix irq_source_id size verification

    find_first_zero_bit works with bit numbers, not bytes.

    Fixes

https://sourceforge.net/tracker/?func=detail&aid=2847560&group_id=180599&atid=893831

    Reported-by: "Xu, Jiajun" <jiajun.xu@intel.com>
    Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2847560&group_id=180599

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