Re: [Libguestfs] [Qemu-devel] Cubietruck: cannot create KVM guests: "kvm_init_vcpu failed: Invalid argument"
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@redhat.com> 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 ... Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top
On Tue, Dec 09, 2014 at 04:59:33PM +0000, Richard W.M. Jones wrote:
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@redhat.com> 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 ...
Yeah, was about to send exactly that to the list. I tested it too, looks good.
From 6468b9d60172bcef76b36c14b72f9a1913d94954 Mon Sep 17 00:00:00 2001 From: Kashyap Chamarthy <kchamart@redhat.com> 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
-- /kashyap
On Tue, Dec 09, 2014 at 06:05:48PM +0100, Kashyap Chamarthy wrote:
On Tue, Dec 09, 2014 at 04:59:33PM +0000, Richard W.M. Jones wrote:
[. . .]
Kashyap, how about the following patch as discussed on IRC ...
Thanks for pushing this.
Yeah, was about to send exactly that to the list. I tested it too, looks good.
From 6468b9d60172bcef76b36c14b72f9a1913d94954 Mon Sep 17 00:00:00 2001 From: Kashyap Chamarthy <kchamart@redhat.com> 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
-- /kashyap
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-- /kashyap
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Kashyap Chamarthy -
Richard W.M. Jones