[Qemu-devel] [PATCH 0/3] arm/virt: refine virt.c code and implement hot_add_cpu interface

[Li Zhang <zhlcindy@gmail.com>]

From: Li Zhang <li.zhang@hxt-semitech.com>

virt machine doesn't support hot_add_cpu interface. This patchset is to implement
hot_add_cpu interface. A CPU can be added by QMP command with QEMU monitor.

Here is command to add a CPU with QMP command.

* qemu-system-aarch64 -machine virt -cpu cortex-a15 -smp 1,maxcpus=4 \
    -monitor telnet:127.0.0.1:4444,server,nowait -nographic
* connect monitor:      telnet 127.0.0.1 4444
* execute qmp command:  cpu-add 1

Currently, when KVM is enabled and add a CPU with QMP command, QEMU 
reports error "kvm_init_vcpu failed: Device or resourc busy". KVM can't
create a new CPU when vgic has been initialized and irqchip_in_kernel in
function kvm_arch_vcpu_create. It needs to change KVM code in the future.

Li Zhang (3):
  arm/virt: Refine fdt_add_cpu_nodes code
  arm/virt: Refine code of machvirt_init
  arm/virt: Implement hot_add_cpu interface

 hw/arm/virt.c | 344 ++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 202 insertions(+), 142 deletions(-)

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2.7.4