Re: kconfig does not accept a lower value for KVM_MAX_NR_VCPUS

[Bagas Sanjaya]

On Sun, Jan 19, 2025 at 12:04:04PM +0100, Toralf Förster wrote:
> I was wondering why I cannot put a lower value here during make oldconfig:
> 
> 
>   Maximum number of vCPUs per KVM guest (KVM_MAX_NR_VCPUS) [1024] (NEW) 16
>   Maximum number of vCPUs per KVM guest (KVM_MAX_NR_VCPUS) [1024] (NEW) 8
>   Maximum number of vCPUs per KVM guest (KVM_MAX_NR_VCPUS) [1024] (NEW)
> 

Hi Toralf,

From arch/x86/kvm/Kconfig:

>config KVM_MAX_NR_VCPUS
>	int "Maximum number of vCPUs per KVM guest"
>	depends on KVM
>	range 1024 4096
>	default 4096 if MAXSMP
>	default 1024
>	help
>	  Set the maximum number of vCPUs per KVM guest. Larger values will increase
>	  the memory footprint of each KVM guest, regardless of how many vCPUs are
>	  created for a given VM.

I don't know your use case, but you can safely choose the default (1024).

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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