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Date: Sat, 14 Sep 2013 14:18:49 +0200 From: Andrew Jones <drjones@...hat.com> To: kvm@...r.kernel.org Cc: gleb@...hat.com, pbonzini@...hat.com, linux-kernel@...r.kernel.org Subject: [PATCH] x86: kvm: introduce CONFIG_KVM_MAX_VCPUS Take CONFIG_KVM_MAX_VCPUS from arm32, but set the default to 255. Signed-off-by: Andrew Jones <drjones@...hat.com> --- 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 <asm/msr-index.h> #include <asm/asm.h> -#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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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