Messages in this thread | | | Date | Mon, 21 Aug 2017 17:52:00 +0200 | From | Radim Krčmář <> | Subject | Re: [PATCH V2] KVM/x86: Increase max vcpu number to 8192 |
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2017-08-15 20:43-0400, Lan Tianyu: > For HPC usage case, it will create a huge VM with vcpus number as same as host > cpus and this requires more vcpus support in a single VM. This patch is to > increase max vcpu number from 288 to 8192 which is current default maximum cpu > number for Linux kernel. > > Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> > --- > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > @@ -35,7 +35,7 @@ > #include <asm/asm.h> > #include <asm/kvm_page_track.h> > > -#define KVM_MAX_VCPUS 288 > +#define KVM_MAX_VCPUS 8192 > #define KVM_SOFT_MAX_VCPUS 240 > #define KVM_MAX_VCPU_ID 1023
We will also need to raise KVM_MAX_VCPU_ID to actually allow that many VCPUs. If I count correctly, it is impossible to have ID bigger than this:
#define KVM_MAX_VCPU_ID (KVM_MAX_VCPUS * 4)
(And we can also use NR_CPUS instead of 8192.)
Thanks.
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