Re: [PATCH] pc: q35: Bump max_cpus to 512

[Igor Mammedov]

On Wed, 4 May 2022 08:16:39 -0500
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> wrote:

> This is the maximum number of vCPU supported by
> the AMD x2APIC virtualization.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
>  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 302288342a..e82b1c690d 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -357,7 +357,7 @@ static void pc_q35_machine_options(MachineClass *m)
>      machine_class_allow_dynamic_sysbus_dev(m, TYPE_INTEL_IOMMU_DEVICE);
>      machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
>      machine_class_allow_dynamic_sysbus_dev(m, TYPE_VMBUS_BRIDGE);
> -    m->max_cpus = 288;
> +    m->max_cpus = 512;

Maybe we should bump it to KVM VCPU maximum,
and make sure we error out if asked for combination of
hardware/irqchip is not usable.


>  }
>  
>  static void pc_q35_7_1_machine_options(MachineClass *m)