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@xxxxxxxxx> > --- > 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.
