Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352

[Konrad Rzeszutek Wilk]

On Wed, Aug 09, 2017 at 11:58:20PM -0400, Lan Tianyu wrote:
> Intel Xeon phi chip will support 352 logical threads. For HPC
> usage case, it will create a huge VM with vcpus number as same as host
> cpus. This patch is to increase max vcpu number to 352.

There is this ioctl called KVM_CAP_MAX_VCPUS. Why not use that?

Oh wait, this is generic code. Perhaps there is a way to make
this more abstract? Where this information is provided via
an function to which various accelerators register?

> 
> Signed-off-by: Lan Tianyu <address@hidden>
> ---
>  hw/i386/pc_q35.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index 169a214..5e93749 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -299,7 +299,7 @@ static void pc_q35_machine_options(MachineClass *m)
>      m->default_display = "std";
>      m->no_floppy = 1;
>      m->has_dynamic_sysbus = true;
> -    m->max_cpus = 288;
> +    m->max_cpus = 352;
>  }
>  
>  static void pc_q35_2_10_machine_options(MachineClass *m)
> -- 
> 1.8.3.1
> 
>