On Tue, Dec 09, 2014 at 05:48:04PM +0100, Kashyap Chamarthy wrote: > On Tue, Dec 09, 2014 at 11:27:02AM +0000, Richard W.M. Jones wrote: > > On Tue, Dec 09, 2014 at 10:53:41AM +0000, Peter Maydell wrote: > > > On 9 December 2014 at 10:50, Kashyap Chamarthy <kchamart(a)redhat.com&gt; wrote: > > > > Booting a minimal KVM guest throws the below error on Cubietruck: > > > > > > > > "kvm_init_vcpu failed: Invalid argument" > > [. . .] > > > > > So that's the answer really, it's a qemu bug. Actually it looks as > > > > if qemu contains some code to try to get the host CPU type, but it > > > > doesn't work, or maybe we need to pass a -cpu option ..." > > > > > > Yes, you need to pass a -cpu option. For KVM on ARM, you > > > always need to either: > > > * pass a -cpu option matching the host CPU > > > * pass "-cpu host" > > > > > > The CubieTruck is a Cortex-A7, which we don't have specific > > > support for in QEMU, so you will need "-cpu host". > > > > Kashyap ^^ can you try this? Should be a trivial one-liner change > > in src/launch-direct.c. > > Yes it works with it :-) > > With the below diff in `libguestfs`: > > $ git diff src/launch.c > diff --git a/src/launch.c b/src/launch.c > index 9fadce8..ce71a8e 100644 > --- a/src/launch.c > +++ b/src/launch.c > @@ -400,7 +400,7 @@ const char * > guestfs___get_cpu_model (int kvm) > { > #if defined(__arm__) /* 32 bit ARM. */ > - return NULL; > + return "host"; > > #elif defined(__aarch64__) > /* With -M virt, the default -cpu is cortex-a15. Stupid. */ > > > I can boot a KVM guest successfully on Cubietruck, invoked via > libguestfs appliance: > > . . . > [01433ms] /bin/qemu-system-arm \ > -global virtio-blk-device.scsi=off \ > -nodefconfig \ > -enable-fips \ > -nodefaults \ > -display none \ > -M vexpress-a15 \ > -cpu host \ > -machine accel=kvm:tcg \ > -m 500 \ > -no-reboot \ > -rtc driftfix=slew \ > -global kvm-pit.lost_tick_policy=discard \ > -kernel /home/kashyapc/src/libguestfs/tmp/.guestfs-1000/appliance.d/kernel \ > -dtb /home/kashyapc/src/libguestfs/tmp/.guestfs-1000/appliance.d/dtb \ > -initrd /home/kashyapc/src/libguestfs/tmp/.guestfs-1000/appliance.d/initrd \ > -device virtio-scsi-device,id=scsi \ > -drive file=/home/kashyapc/src/libguestfs/tmp/libguestfsRMfHzO/scratch.1,cache=unsafe,format=raw,id=hd0,if=none \ > -device scsi-hd,drive=hd0 \ > -drive file=/home/kashyapc/src/libguestfs/tmp/.guestfs-1000/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none \ > -device scsi-hd,drive=appliance \ > -device virtio-serial-device \ > -serial stdio \ > -chardev socket,path=/home/kashyapc/src/libguestfs/tmp/libguestfsRMfHzO/guestfsd.sock,id=channel0 \ > -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \ > -append 'panic=1 mem=500M console=ttyAMA0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=vt102' > . . . Kashyap, how about the following patch as discussed on IRC ...

From 6468b9d60172bcef76b36c14b72f9a1913d94954 Mon Sep 17 00:00:00 2001 From: Kashyap Chamarthy <kchamart(a)redhat.com&gt; Date: Tue, 9 Dec 2014 16:58:11 +0000 Subject: [PATCH] arm: Use -cpu host on KVM. --- src/launch.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/launch.c b/src/launch.c index 9fadce8..78d26fe 100644 --- a/src/launch.c +++ b/src/launch.c @@ -400,7 +400,10 @@ const char * guestfs___get_cpu_model (int kvm) { #if defined(__arm__) /* 32 bit ARM. */ - return NULL; + if (kvm) + return "host"; + else + return NULL; #elif defined(__aarch64__) /* With -M virt, the default -cpu is cortex-a15. Stupid. */ -- 2.1.0