linux-kernel - Re: [PATCH v1 11/11] KVM: x86: bump MAX

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Date:	Fri, 1 Jul 2016 10:43:26 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	"Lan, Tianyu" <tianyu.lan@...el.com>,
	Igor Mammedov <imammedo@...hat.com>,
	Jan Kiszka <jan.kiszka@....de>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v1 11/11] KVM: x86: bump MAX_VCPUS to 288



On 30/06/2016 22:54, Radim Krčmář wrote:
> 288 is in high demand because of Knights Landing CPU.
> We cannot set the limit to 640k, because that would be wasting space.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  arch/x86/include/asm/kvm_host.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 48b0ca18066c..411da14a675e 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -34,7 +34,7 @@
>  #include <asm/asm.h>
>  #include <asm/kvm_page_track.h>
>  
> -#define KVM_MAX_VCPUS 255
> +#define KVM_MAX_VCPUS 288
>  #define KVM_SOFT_MAX_VCPUS 240
>  #define KVM_USER_MEM_SLOTS 509
>  /* memory slots that are not exposed to userspace */
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>

Paolo