[ kvm-Bugs-1850037 ] SMP 8-way doesn't works, and returns incorrect error

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Bugs item #1850037, was opened at 2007-12-13 14:25
Message generated for change (Comment added) made by ravpl
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Category: None
Group: None
Status: Closed
Resolution: Fixed
Priority: 5
Private: No
Submitted By: Technologov (technologov)
Assigned to: Nobody/Anonymous (nobody)
Summary: SMP 8-way doesn't works, and returns incorrect error

Initial Comment:
Host: AMD Barcelona, 8-way SMP (Octo Core), 8 GB of RAM, Fedora 7/x64. KVM-56.

[alexeye@qu0045 scripts]$ ./qemu-kvm -hda /isos/disks-vm/alexeye/openSUSE-10.3-test32.vmdk -cdrom /isos/openSuse-10.3-GM-x86_64.iso -m 9000 -smp 8 -boot d
(VMDK) image open: flags=0x2 filename=/isos/disks-vm/alexeye/openSUSE-10.3-test32.vmdk
kvm_create_vcpu: Invalid argument
kvm_create_vcpu: Invalid argument
kvm_run: Bad file descriptor
kvm_create_vcpu: Invalid argument
kvm_run returned -9
kvm_create_vcpu: Invalid argument

[alexeye@qu0045 scripts]$ free
             total       used       free     shared    buffers     cached
Mem:       8255648    8213812      41836          0      55376    6573508
-/+ buffers/cache:    1584928    6670720
Swap:      4194288          0    4194288

Output of dmesg:
SIPI to vcpu 1 vector 0x10
SIPI to vcpu 2 vector 0x10
SIPI to vcpu 3 vector 0x10
kvm: 16024: cpu0 unhandled rdmsr: 0x417
Ignoring de-assert INIT to vcpu 1
SIPI to vcpu 1 vector 0x06
SIPI to vcpu 1 vector 0x06
kvm: 16024: cpu1 unhandled rdmsr: 0x417
Ignoring de-assert INIT to vcpu 2
SIPI to vcpu 2 vector 0x06
SIPI to vcpu 2 vector 0x06
kvm: 16024: cpu2 unhandled rdmsr: 0x417
Ignoring de-assert INIT to vcpu 3
SIPI to vcpu 3 vector 0x06
SIPI to vcpu 3 vector 0x06
kvm: 16024: cpu3 unhandled rdmsr: 0x417
Machine check events logged

==================================================

Expected Behavior:
It must either work, or return proper error message, that SMP beyond 4-way is not supported.

-Alexey "Technologov", 13.12.2007.

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Comment By: Rafal Wijata (ravpl)
Date: 2008-04-28 13:44

Message:
Logged In: YES 
user_id=996150
Originator: NO

I have dual quad core
model name      : Intel(R) Xeon(R) CPU           E5420  @ 2.50GHz
and can confirm, that I can't run kvm with more than 4 vcpus.
I run custom compiled kvm-66 on Linux mailhub 2.6.24.4-64.fc8 #1 SMP Sat
Mar 29 09:15:49 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
Modules are from FC8 rather than kvm-66.

Browsing kvm sources showed static array for 16 cpus. Maybe those four it
kernel's module limit?

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

Comment By: Technologov (technologov)
Date: 2008-02-26 14:28

Message:
Logged In: YES 
user_id=1839746
Originator: YES

FIXED in KVM-62.

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