5956 2014-03-13 01:34:30 +0000 linux-yocto cant boot in qemu when cpu=host 2014-04-02 10:10:36 +0000 1 1 6 Yocto Project Subprojects Kernel linux-yocto 1.6 x86 x86_64 RESOLVED FIXED Medium normal 1.6 1 raj.khem sstncr sgw sstncr --- --- Don't know oldest_to_newest 41152 0 raj.khem 2014-03-13 01:34:30 +0000 This bug is actually same for which we did a workaround in bug #3908 this time the problem happens when I try to boot the virtual appliance .vmdk image in virtualbox. Unfortunately virtualbox does not have options to change cpu emulation like qemu-kvm. This issue is still present in current 3.10.x linux-yocto. We need to resolve it properly, since normal upstream kernels are able to boot normally in virtualbox its a bug in linux-yocto. To reproduce it apply this patch --- a/scripts/runqemu-internal +++ b/scripts/runqemu-internal @@ -398,7 +398,7 @@ fi if [ "$MACHINE" = "qemux86-64" ]; then QEMU=qemu-system-x86_64 if [ "$KVM_ACTIVE" = "yes" ]; then - CPU_SUBTYPE=kvm64 + CPU_SUBTYPE=host else CPU_SUBTYPE=core2duo fi and then runqemu qemux86-64 kvm 41951 1 sstncr 2014-03-31 11:49:39 +0000 I think that the right fix to use -cpu host is to include paravirt kernel config for qemux86-64. (this isn't needed for -cpu kvm64 as it is now) Note that it is enabled for qemux86 but not for x86-64. The is what we currently have in linux-yocto-3.10.bb: KERNEL_FEATURES_append_qemux86=" cfg/sound.scc cfg/paravirt_kvm.scc" KERNEL_FEATURES_append_qemux86-64=" cfg/sound.scc" That change has been inherited from recipe to recipe since: http://git.yoctoproject.org/cgit.cgi/poky/commit/meta/recipes-kernel/linux/linux-yocto_3.4.bb?id=e6149ec6c4c14d3a939022cdc29ac94dced836dd The reason for that commit was that on AB some qemux86-64 failed to shutdown because of the old host kernel. But that's more than a year old commit, and the ABs are now on newer kernels. So if we want kvm and -cpu host on a host with kernel >=3.8 we should enable that config back. 41974 2 dvhart 2014-03-31 17:30:50 +0000 No objection from me. Have you tested a change? Could you do so and submit a patch? 42016 3 sstncr 2014-04-01 10:02:58 +0000 Patch sent - tested that the image behaves good - without kvm - with kvm (and the default cpu=kvm64) and - with kvm and Khem's change to runqemu (cpu=host) Have a look on the ML. Btw, I've sent the change for the new linux-yocto-3.14 only, if that matters to anyone. 42137 4 sstncr 2014-04-02 10:10:36 +0000 Merged in master: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=02e455f90fbe34e3679fefb9ddc53a3ecad68322