Hi, On Mon, Sep 14, 2015 at 06:03:48PM -0600, liang yan wrote: > Hello, All, > > I am trying to enable kvm for a guest vm on an APM X-Gene Host with > latest qemu, but could not make it work. > > The host is APM X-Gene 8-core, Linux kernel is 4.1.0-rc7-1-arm64, > > Guest kernel is linux-3.16rc3 > > QEMU is latest version > > Host has these dmesg info > [ 2.708259] kvm [1]: GICH base=0x780c0000, GICV base=0x780e0000, IRQ=25 > [ 2.708327] kvm [1]: timer IRQ30 > [ 2.708335] kvm [1]: Hyp mode initialized successfully > > Host has dev/kvm. > > command-line is > aarch64-softmmu/qemu-system-aarch64 -machine virt,kernel_irqchip=off > -cpu cortex-a57 -machine accel=kvm -nographic -smp 1 -m 2048 -kernel > aarch64-linux-3.16rc3-buildroot.img --append "console=ttyAMA0" > > > when using cpu "cortex-a57", got the error "kvm_init_vcpu failed: > Invalid argument"
Currently, it is not possible to run qemu with a cpu type other than the host. I'm currently in the process of adding the necessary support and have posted the necessary RFC patches for kvm[1] and qemu[2]. [1] http://comments.gmane.org/gmane.linux.ports.arm.kernel/438744 [2] https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg02374.html -- Regards, Tushar > when using cpu "host", got the error "Failed to retrieve host CPU features!" > > By the way, all the command line works well under "tcg" mode. > Anyone has a quick idea? Thanks in advance. > > Best, > Liang > >
