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SubjectRe: [PATCH 3/3] aarch64: kvm: introduce CONFIG_KVM_MAX_VCPUS
On Sat, Sep 14, 2013 at 02:10:56PM +0200, Andrew Jones wrote:
> Take CONFIG_KVM_MAX_VCPUS from arm32, but set the default to 8.
>
> Signed-off-by: Andrew Jones <drjones@redhat.com>
> ---
> arch/arm64/include/asm/kvm_host.h | 7 ++++++-
> arch/arm64/kvm/Kconfig | 11 +++++++++++
> 2 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 0859a4ddd1e7d..d1af8c49a5ca4 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -26,7 +26,12 @@
> #include <asm/kvm_asm.h>
> #include <asm/kvm_mmio.h>
>
> -#define KVM_MAX_VCPUS 4
> +#if defined(CONFIG_KVM_MAX_VCPUS)
> +#define KVM_MAX_VCPUS CONFIG_KVM_MAX_VCPUS
> +#else
> +#define KVM_MAX_VCPUS 0
> +#endif
> +
> #define KVM_USER_MEM_SLOTS 32
> #define KVM_PRIVATE_MEM_SLOTS 4
> #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
> index 21e90820bd23c..c9924b02e84f7 100644
> --- a/arch/arm64/kvm/Kconfig
> +++ b/arch/arm64/kvm/Kconfig
> @@ -35,6 +35,17 @@ config KVM_ARM_HOST
> ---help---
> Provides host support for ARM processors.
>
> +config KVM_MAX_VCPUS
> + int "Number maximum supported virtual CPUs per VM"
> + depends on KVM_ARM_HOST
> + default 8

That data structure gets really big with 8 max vcpus. I think we should
keep this at 4 for now, a quad-core VM is quite reasonable for now.

> + help
> + Static number of max supported virtual CPUs per VM.
> +
> + The default is set to the highest number of vcpus that
> + current hardware supports. Set to a lower number to save
> + some resources. Set to a higher number to test scalability.
> +
> config KVM_ARM_VGIC
> bool
> depends on KVM_ARM_HOST && OF
> --
> 1.8.1.4
>

--
Christoffer


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