Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932161Ab3INMSz (ORCPT ); Sat, 14 Sep 2013 08:18:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:32684 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752416Ab3INMSy (ORCPT ); Sat, 14 Sep 2013 08:18:54 -0400 From: Andrew Jones To: kvm@vger.kernel.org Cc: gleb@redhat.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org Subject: [PATCH] x86: kvm: introduce CONFIG_KVM_MAX_VCPUS Date: Sat, 14 Sep 2013 14:18:49 +0200 Message-Id: <1379161129-28393-1-git-send-email-drjones@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1627 Lines: 53 Take CONFIG_KVM_MAX_VCPUS from arm32, but set the default to 255. Signed-off-by: Andrew Jones --- arch/x86/include/asm/kvm_host.h | 5 +++-- arch/x86/kvm/Kconfig | 10 ++++++++++ 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index c76ff74a98f2e..e7e9b523a8f7e 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -31,8 +31,9 @@ #include #include -#define KVM_MAX_VCPUS 255 -#define KVM_SOFT_MAX_VCPUS 160 +#define KVM_MAX_VCPUS CONFIG_KVM_MAX_VCPUS +#define KVM_SOFT_MAX_VCPUS min(160, KVM_MAX_VCPUS) + #define KVM_USER_MEM_SLOTS 125 /* memory slots that are not exposed to userspace */ #define KVM_PRIVATE_MEM_SLOTS 3 diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index a47a3e54b964b..e9532c33527ee 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -52,6 +52,16 @@ config KVM If unsure, say N. +config KVM_MAX_VCPUS + int "Number maximum supported virtual CPUs per VM" + depends on KVM + default 255 + help + Static number of max supported virtual CPUs per VM. + + Set to a lower number to save some resources. Set to a higher + number to test scalability. + config KVM_INTEL tristate "KVM for Intel processors support" depends on KVM -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/