tags 604604 + moreinfo thanks 23.11.2010 01:20, Jakub Wilk wrote: > Package: qemu-kvm > Version: 0.13.0+dfsg-2 > Severity: grave > Justification: renders package unusable > > After 0.12.5+dfsg-5 -> 0.13.0+dfsg-2 upgrade kvm doesn't start anymore. > I get an error immediately: > > $ kvm > kvm: vm entry failed with error 0xffffffff > > kvm_run returned -22
> model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ > Architecture: i386 (i686) > Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores) > linux-image-2.6.32-5-686 [lin 2.6.32-27 Linux 2.6.32 for modern PCs This looks like a kernel problem which is fixed by a recent -stable upstream kernel (2.6.32.26): >From [email protected] Fri Oct 29 15:18:43 2010 From: Joerg Roedel <[email protected]> Date: Thu, 28 Oct 2010 16:48:09 -0200 Subject: KVM: SVM: Fix wrong intercept masks on 32 bit To: [email protected] Cc: [email protected], [email protected], [email protected], Jan Kiszka <[email protected]>, Gleb Natapov <[email protected]>, Joerg Roedel <[email protected]> Message-ID: <[email protected]> Content-Disposition: inline; filename=0001-KVM-SVM-Fix-wrong-intercept-masks-on-32-bit.patch From: Joerg Roedel <[email protected]> commit 061e2fd16863009c8005b4b5fdfb75c7215c0b99 upstream. This patch makes KVM on 32 bit SVM working again by correcting the masks used for iret interception. With the wrong masks the upper 32 bits of the intercepts are masked out which leaves vmrun unintercepted. This is not legal on svm and the vmrun fails. Bug was introduced by commits 95ba827313 and 3cfc3092. Cc: Jan Kiszka <[email protected]> Cc: Gleb Natapov <[email protected]> Signed-off-by: Joerg Roedel <[email protected]> Signed-off-by: Avi Kivity <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/x86/kvm/svm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) The problem case happens on 32bit kernel only and does not happen on 64bit. Please try with amd64 kernel (linux-image-2.6.32-5-amd64) - it should just work. Note that almost no one tests kvm on 32bits nowadays, consider running 64bit kernel with either 32 or 64 bit userspace. I run 64bit kernel and 32bit userspace for a long time and now finally I can say most probs in this configuration has been fixed - for more than a year I haven't encountered one :) And please also consider switching to AthlonII - your processor lacks npt (nested page tables) support and TSC syncronisation, both affects performance and stability of kvm guest in significant way. Not related to this bugreport, just a general suggestion. Tagging as 'moreinfo' for now, if the problem turns out to be what I think it is, I'll reassign it to kernel-image and downgrade to normal. Thanks! /mjt -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
