On Sun, Sep 15, 2013 at 12:08:38PM +0300, Gleb Natapov wrote: > On Sat, Sep 14, 2013 at 02:18:49PM +0200, Andrew Jones wrote: > > Take CONFIG_KVM_MAX_VCPUS from arm32, but set the default to 255. > > > > Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx> > > --- > > 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. > > + > Maximum this can save is around 2K per VM. This is pretty insignificant > considering overall memory footprint even smallest VM has. Should I reword this, dropping all 'save resources' verbiage, in order to avoid sending a message that this option can affect resource consumption? Or just leave it as it is, because even though it's insignificant, it's still true and balances out the 'Set to a higher' part. drew > > > config KVM_INTEL > > tristate "KVM for Intel processors support" > > depends on KVM > > -- > > 1.8.1.4 > > -- > Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
