Kyle Meyer <kyle.meyer@xxxxxxx> writes: > Increase KVM_MAX_VCPUS to 2048 so we can run larger virtual machines. > > Notable changes: > > * KVM_CAP_MAX_VCPUS will return 2048. > * KVM_MAX_VCPU_IDS will increase from 4096 to 8192. > * KVM_HV_MAX_SPARSE_VCPU_SET_BITS will increase from 16 to 32. > > * CPUID[HYPERV_CPUID_IMPLEMENT_LIMITS (00x40000005)].EAX will now be 2048. > > * struct kvm will increase from 40336 B to 40464 B. > * struct kvm_arch will increase from 34488 B to 34616 B. > * struct kvm_ioapic will increase from 5240 B to 9848 B. > > * vcpu_mask in kvm_hv_flush_tlb will increase from 128 B to 256 B. > * vcpu_mask in kvm_hv_send_ipi will increase from 128 B to 256 B. FWIW, this one will go away when https://lore.kernel.org/kvm/20220606083655.2014609-11-vkuznets@xxxxxxxxxx/ lands. > * vcpu_bitmap in ioapic_write_indirect will increase from 128 B to 256 B. > * vp_bitmap in sparse_set_to_vcpu_mask will increase from 128 B to 256 B. ... > * sparse_banks in kvm_hv_flush_tlb will increase from 128 B to 256 B. > * sparse_banks in kvm_hv_send_ipi will increase from 128 B to 256 B. and these two are going away with https://lore.kernel.org/kvm/20220606083655.2014609-13-vkuznets@xxxxxxxxxx/ (at the cost of growing 'struct kvm_vcpu_hv') > > Signed-off-by: Kyle Meyer <kyle.meyer@xxxxxxx> > --- > arch/x86/include/asm/kvm_host.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > index 3a240a64ac68..58653c63899f 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -38,7 +38,7 @@ > > #define __KVM_HAVE_ARCH_VCPU_DEBUGFS > > -#define KVM_MAX_VCPUS 1024 > +#define KVM_MAX_VCPUS 2048 > > /* > * In x86, the VCPU ID corresponds to the APIC ID, and APIC IDs -- Vitaly
