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Date:   Thu, 13 Apr 2017 22:19:47 +0200
From:   Radim Krčmář <>
Cc:     Christoffer Dall <>,
        Marc Zyngier <>,
        Paolo Bonzini <>,
        Christian Borntraeger <>,
        Cornelia Huck <>,
        James Hogan <>,
        Paul Mackerras <>,
        Alexander Graf <>
Subject: [PATCH 0/4] KVM: add KVM_CREATE_VM2 to allow dynamic kvm->vcpus array

The basic idea is to let userspace provide the desired maximal number of
VCPUs and allocate only necessary memory for them.

The goal is to freeze KVM_MAX_VCPUS at its current level and only increase the
new KVM_MAX_CONFIGURABLE_VCPUS, probably directly to INT_MAX/KVM_VCPU_ID, so we
don't have to worry about it for a while.

PPC should be interested in this as they set KVM_MAX_VCPUS to NR_CPUS
and probably waste few pages for every guest this way.

Radim Krčmář (4):
  KVM: remove unused __KVM_HAVE_ARCH_VM_ALLOC
  KVM: allocate kvm->vcpus separately
  KVM: add KVM_CREATE_VM2 system ioctl
  KVM: x86: enable configurable MAX_VCPU

 Documentation/virtual/kvm/api.txt | 28 +++++++++++++++
 arch/x86/include/asm/kvm_host.h   |  1 +
 arch/x86/kvm/irq_comm.c           |  4 +--
 include/linux/kvm_host.h          | 23 +++++-------
 include/uapi/linux/kvm.h          |  8 +++++
 virt/kvm/kvm_main.c               | 76 +++++++++++++++++++++++++++++++++------
 6 files changed, 114 insertions(+), 26 deletions(-)


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