Re: [PATCH v4 0/8] arm/arm64: KVM: dynamic VGIC sizing

Christoffer Dall
2014-09-25T13:35:04Z

On Thu, Sep 25, 2014 at 08:44:16PM +0800, Shannon Zhao wrote:
> Hi all,
>
> I have a problem that I want to ask for your advice.
> Before I send this mail to Marc and Christoffer. But it seems that they are busy or not online recently.
>
> I git clone Marc's "kvmtool-vgic-dyn" branch and run it on Fastmodel Cortex-A57*4 with qemu 2.1.0.
> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git
>
> I want to do repeated lifecycle test. The test is that start 2 VMs, sleep 10 and do pkill qemu.
> Test script is following:
> #!/bin/sh
> while true
> do
> qemu-system-aarch64 \
> -enable-kvm -smp 4 \
> -kernel Image \
> -m 512 -machine virt,kernel_irqchip=on \
> -initrd guestfs.cpio.gz \
> -cpu host \
> -chardev pty,id=pty0,mux=on -monitor chardev:pty0 \
> -serial chardev:pty0 -daemonize \
> -vnc 0.0.0.0:0 \
> -append "rdinit=/sbin/init console=ttyAMA0 mem=512M root=/dev/ram earlyprintk=pl011,0x9000000 rw" &
>
> qemu-system-aarch64 \
> -enable-kvm -smp 4 \
> -kernel Image \
> -m 512 -machine virt,kernel_irqchip=on \
> -initrd guestfs.cpio.gz \
> -cpu host \
> -chardev pty,id=pty0,mux=on -monitor chardev:pty0 \
> -serial chardev:pty0 -daemonize \
> -vnc 0.0.0.0:1 \
> -append "rdinit=/sbin/init console=ttyAMA0 mem=512M root=/dev/ram earlyprintk=pl011,0x9000000 rw" &
> sleep 10
> pkill qemu
> done
>
> After repeating sometimes there is something wrong happened as followed.
> Look forward for your reply.
> Thanks,
> Shannon
>
Hi Shannon,

This appears to be related to a bug in vgic_set_attr() which messes up
the bitmap initialization, I'm working on a patch.

-Christoffer