[Qemu-devel] Could not boot a guest vm from kvm mode based on APM X-Gene Host and latest qemu

[liang yan]

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"
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