Red Hat Bugzilla – Bug 481274
KVM running on 32-bit host on 64-bit CPU passes EM64T flag to guests
Last modified: 2010-06-28 07:08:29 EDT
Description of problem:
I am running a 32-bit kernel (kernel-PAE) on a 64-bit capable CPU (Intel E8400).
kvm guests on this system see the EM64T flag of the host CPU in their virtual CPU, which leads some of them to assume that they can start a 64-bit capable kernel (opensolaris does this, for example).
This does not end well (the guest os crashes).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install Opensolaris (I tried with nevada 103, the install itself will succeed, as there is no 64-bit installer)
2. Reboot the newly installed system
OS does not boot, as it tries to start a 64-bit kernel. Manually forcing a 32-bit kernel works.
Automatic select of 32-bit kernel
There's an easy fix for this, but looking a bit deeper, the current situation with
respect to cpuid handling is quite messy. I plan on rewriting it on Monday, and will let you know.
Reassigning: The kvm package no longer exists in rawhide/F11, since it is now part of 'qemu'.
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
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