Hardik H Bagdi <hbagdi1@xxxxxxxxxxxxxx> writes: > Hello, > > For research, I am experimenting with increasing the number of VCPUs > in the guest OS. > I can increase the number of VCPUs till 255 in the guest OS but more > than that results in the following error- > > kvm_init_vcpu failed: Invalid argument > > The hardcodede value of 255 can be found here for x86. > ./arch/x86/include/asm/kvm_host.h:38:#define KVM_MAX_VCPUS 255 > > #define a new value is not successful i.e. the same error persists. > I'm using qemu 2.5.0 with host kernel 3.19.0 > Any help will be really appreciated. Radim (Cced) might have more info but the short answer is that you can't just simply increase the number. For >255, you need x2apic with interrupt remapping which is still missing. > Thank you, > Hardik Bagdi > -- > 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 -- 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
