I have an older Intel CPU which doesn't support NX (/proc/cpuinfo -
below). Is it safe to migrate guests running on newer CPUs to this older
CPU? I made some simple tests and migration works, but I'm not sure if
the guests will be stable after such migration.
I'm also a bit confused a bit over what the documentation says:
According to http://www.linux-kvm.org/page/Migration:
There are some older Intel processors which don't support NX (or XD),
which may cause problems in a cluster which includes NX-supporting
hosts. We may add a feature to hide NX if this proves to be a problem
in actual deployments.
So the above says I may have some problems.
On the other hand, FAQ below seems to indicate that migration on 64 bit
hosts should be fine (even when they don't support NX?), only 32 bit
hosts may have problems:
http://www.linux-kvm.org/page/FAQ
Yes. There may be issues on 32-bit Intel hosts which don't support NX
(or XD), but for 64-bit hosts back and forth migration should work
well. Migration of 32-bit guests should work between 32-bit hosts and
64-bit hosts.
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU 3050 @ 2.13GHz
stepping : 6
cpu MHz : 2133.410
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall lm constant_tsc arch_perfmon pebs bts rep_good pni monitor
ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm
bogomips : 4266.87
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
--
Tomasz Chmielewski
http://wpkg.org
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