On Sun, Dec 11, 2011 at 06:03, Debian Bug Tracking System <ow...@bugs.debian.org> > ---------- Forwarded message ---------- > From: Bastian Blank <wa...@debian.org> > > This is no bug, but actually documented. You can't migrate systems to a > cpu with lower capabilities.
Out of interest, where is this documented? The debian examples would seem to indicate you can, by limiting the guest CPU features: Try zgrep cpuid /usr/share/doc/xen-utils-common/examples/* It should also be possible to do so by masking features on the host CPU, via kernel boot options ( see http://zhigang.org/wiki/XenCPUID ) However in 'xm dmesg' I get the following: (XEN) Cannot set CPU feature mask on CPU#0 (XEN) Cannot set CPU feature mask on CPU#1 (XEN) Cannot set CPU feature mask on CPU#2 (XEN) Cannot set CPU feature mask on CPU#3 (XEN) Cannot set CPU feature mask on CPU#4 (XEN) Cannot set CPU feature mask on CPU#5 (XEN) Cannot set CPU feature mask on CPU#6 (XEN) Cannot set CPU feature mask on CPU#7 (XEN) Cannot set CPU feature mask on CPU#8 (XEN) Cannot set CPU feature mask on CPU#9 (XEN) Cannot set CPU feature mask on CPU#10 (XEN) Cannot set CPU feature mask on CPU#11 (XEN) Cannot set CPU feature mask on CPU#12 (XEN) Cannot set CPU feature mask on CPU#13 (XEN) Cannot set CPU feature mask on CPU#14 (XEN) Cannot set CPU feature mask on CPU#15 when trying to boot with the following options: cpuid_mask_ecx=0x0008E3FD cpuid_mask_edx=0xBFEBFBFF It accepts and tries to act on the mask, but does not succeed. Also does not give indication as to why. -- Marcus Furlong -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
