Re: [PATCH 0/5] KVM: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS and re-purpose it on x86

From: Christian Borntraeger
Date: Mon Nov 15 2021 - 07:18:23 EST


Am 11.11.21 um 17:32 schrieb Paolo Bonzini:
On 11/11/21 17:27, Vitaly Kuznetsov wrote:
This is a comtinuation of "KVM: x86: Drop arbitraty KVM_SOFT_MAX_VCPUS"
(https://lore.kernel.org/kvm/20211111134733.86601-1-vkuznets@xxxxxxxxxx/)
work.

1) Enforce KVM_CAP_NR_VCPUS <= KVM_CAP_MAX_VCPUS rule on all
  architectures. [Sean Christopherson]
2) Make KVM_CAP_NR_VCPUS return num_online_cpus() and not an arbitrary
  value of '710' on x86.

Everything but x86 was only 'eyeball tested', the change is trivial
but sorry in advance if I screwed up)

Christian, can you look at this for s390?  Returning a fixed value seems wrong for KVM_CAP_NR_VCPUS.

will do. (Sorry I was OOO the last days).

Thanks,

Paolo

Vitaly Kuznetsov (5):
   KVM: arm64: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS
   KVM: MIPS: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS
   KVM: PPC: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS
   KVM: RISC-V: Cap KVM_CAP_NR_VCPUS by KVM_CAP_MAX_VCPUS
   KVM: x86: Drop arbitraty KVM_SOFT_MAX_VCPUS

  arch/arm64/kvm/arm.c            | 7 ++++++-
  arch/mips/kvm/mips.c            | 2 +-
  arch/powerpc/kvm/powerpc.c      | 4 ++--
  arch/riscv/kvm/vm.c             | 2 +-
  arch/x86/include/asm/kvm_host.h | 1 -
  arch/x86/kvm/x86.c              | 2 +-
  6 files changed, 11 insertions(+), 7 deletions(-)