Re: kvm 35 and 36 segfault when smp 2 or more

[Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Gianluca Cecchi wrote:
> System is a quadcore intel with Fedora 7 x86_64
> tried with latest ok kernel 2.6.22.4-65.fc7 and the one in testing: 
> 2.6.22.5-71.fc7
> tried with latest kvm 24 in F7, then with kvm-35 in testing then 
> compiling kvm-36 (with same .spec of fedora one)
> qemu-kvm -cdrom F-7.90-x86_64-rescuecd.iso -boot d -smp 1
> is ok (also without smp switch at all that should be the same)
> with -smp 2
> I get
> kvm_create_vcpu: Invalid argument
> kvm_get_msrs FAILED: Invalid argument
> kvm_set_msrs FAILED: Invalid argument
> Segmentation fault
> and in dmesg
> Sep  5 00:04:20 localhost kernel: qemu-kvm[3655]: segfault at 
> 0000000000000000 r
> ip 00000000004de19d rsp 00000000409fff90 error 6
>
> with -smp 3 one more kvm_create_vcpu: Invalid argument error and
> qemu-kvm[4102]: segfault at 0000000000000000 rip 00000000004de19d rsp 
> 0000000041400f90 error 6
>
> the same for example with x86 winxp iso img
> qemu-system-x86_64 works ok and if I go in console and do "info cpus"
> I can find
> * cpu#0: pc=0x000000000000e84
>   cpu#1: pc=0x0000000000010009 (halted)
>
> any hints on having kvm smp guest working?
>
> BTW: in one thread of this list I saw that, if I understood right, it 
> should be safe now not to use --with-patched-kernel with kernels 
> greater than 2.6.22 (as mine is) and that this was valid when kvm was 
> only in -mm tree
> In Fedora spec the configure step is yet
> ./configure --with-patched-kernel --qemu-cc=gcc34 
> --kerneldir=$(pwd)/kernel --prefix=%{_prefix}
>
is it mean you didnt compile the new kernel modules?
the linux 2.6.22 kvm does not support smp, dont use the 
--with-patched-kernel
and after building kvm-36 do: rmmod kvm_intel rmmod kvm
insmod kernel/kvm.ko insmod kernel/kvm-intel.ko and try it now.



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