Date: Fri, 4 Aug 2017 14:29:51 +0100 From: Mark Rutland <mark.rutland@arm.com> To: Andrea Bolognani <abologna@redhat.com> Cc: freebsd-arm@freebsd.org, Andrew Turner <andrew@fubar.geek.nz> Subject: Re: virtio-net issues on aarch64 QEMU/KVM Message-ID: <20170804132950.GA9477@remoulade> In-Reply-To: <1501165794.4378.8.camel@redhat.com> References: <1501165794.4378.8.camel@redhat.com>
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On Thu, Jul 27, 2017 at 04:29:54PM +0200, Andrea Bolognani wrote:
> Hi all,
Hi,
> I'm trying 11.1-RELEASE on QEMU/KVM, and I'm having some
> trouble with VirtIO networking.
Likewise on both counts.
As a (vaguely-related) heads-up, you will find that 11.1 will not work as an
SMP KVM guest, as it doesn't enable SGIs for the boot CPU in the GIC
distributor, leading to a lockup later in the boot process. I think Andrew
Turner is currently looking at fixing that.
> I've imported the official qcow2 image into libvirt by
> running
>
> # virt-install \
> --name freebsd \
> --arch aarch64 \
> --machine virt \
> --ram 2048 \
> --vcpus 1 \
> --accelerate \
> --graphics none \
> --features acpi=off \
> --os-variant freebsd11.0 \
> --import \
> --disk path=/var/lib/libvirt/images/freebsd.qcow2,bus=virtio,address.type=virtio-mmio \
> --network network=default,model=virtio,address.type=virtio-mmio
>
> and the system comes up succesfully; however, when I
> try to activate the network interface by running
>
> # dhclient vtnet0
>
> the process seems to pretty much just sit there. ^C
> doesn't help. Needless to say, if I configure vtnet0 to
> be brought up at boot I never get to the prompt.
I see the same thing with or without KVM using QEMU 2.9.0, upstream EDK2
(commit ef3d1df77bbd5227), and the same 11.1-RELEASE VM image. I'm not using
libvirt, but I see issues when pasing QEMU:
-device virtio-net-device,netdev=net0 netdev user,id=net0
At boot time, FreeBSD stops making progress after "Feeding entropy: .", and if
I send SIGINFO with ^T, I see:
load: 1.55 cmd: ifconfig 233 [runnable] 124.01r 0.00u 123.88s 100% 2768k
I dumped a stacktrace using QEMU's gdbserver; it looks like FreeBSD is polling
the virtio queue waiting for something:
#0 0xffff000000170294 in VIRTIO_BUS_POLL (dev=0xfffffd00005ab900) at ./virtio_bus_if.h:159
#1 virtqueue_poll (vq=0xffff00004083e000, len=0x0) at /usr/src/sys/dev/virtio/virtqueue.c:573
#2 0xffff00000017707c in vtnet_ctrl_mac_cmd (sc=0xfffffd00004fa000, hwaddr=<optimized out>) at /usr/src/sys/dev/virtio/network/if_vtnet.c:3163
#3 vtnet_set_hwaddr (sc=0xfffffd00004fa000) at /usr/src/sys/dev/virtio/network/if_vtnet.c:3588
#4 0xffff000000176568 in vtnet_reinit (sc=0xfffffd00004fa000) at /usr/src/sys/dev/virtio/network/if_vtnet.c:3022
#5 vtnet_init_locked (sc=0xfffffd00004fa000) at /usr/src/sys/dev/virtio/network/if_vtnet.c:3069
#6 0xffff000000175ff8 in vtnet_ioctl (ifp=0xfffffd000058f000, cmd=<optimized out>, data=<optimized out>) at /usr/src/sys/dev/virtio/network/if_vtnet.c:1107
#7 0xffff000000373e60 in ifhwioctl (cmd=<optimized out>, ifp=<optimized out>, td=<optimized out>, data=<optimized out>) at /usr/src/sys/net/if.c:2456
#8 ifioctl (so=<optimized out>, cmd=2149607696, data=0xffff000054ae1888 "vtnet0", td=<optimized out>) at /usr/src/sys/net/if.c:2836
#9 0xffff0000002f3b14 in fo_ioctl (fp=<optimized out>, com=2149607696, active_cred=<optimized out>, td=<optimized out>, data=<optimized out>) at /usr/src/sys/sys/file.h:323
#10 kern_ioctl (td=0xfffffd0000a7f000, fd=3, com=2149607696, data=0xffff000054ae1888 "vtnet0") at /usr/src/sys/kern/sys_generic.c:836
#11 0xffff0000002f377c in sys_ioctl (td=0xfffffd0000a7f000, uap=0xffff000054ae1978) at /usr/src/sys/kern/sys_generic.c:745
#12 0xffff000000555408 in syscallenter (td=<optimized out>, sa=<optimized out>) at /usr/src/sys/arm64/arm64/../../kern/subr_syscall.c:135
#13 svc_handler (frame=<optimized out>, td=<optimized out>) at /usr/src/sys/arm64/arm64/trap.c:139
#14 do_el0_sync (td=0xfffffd0000a7f000, frame=<optimized out>) at /usr/src/sys/arm64/arm64/trap.c:366
... unfortunately I'm not all that familiar with how virtio works, so I'm not
sure which end is doing the wrong thing.
Thanks,
Mark.
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