linux-kernel - [PATCH 0/3] KVM: do not use kvm->online_vcpus to check "has one VCPU been created?"

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Date:	Mon, 13 Jun 2016 15:25:29 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>,
	Christian Borntraeger <christian.borntraeger@...ibm.com>
Subject: [PATCH 0/3] KVM: do not use kvm->online_vcpus to check "has one VCPU been created?"

kvm->online_vcpus is only updated at the very end of KVM_CREATE_VCPU.
Thus, it can be racy to use it as a check for "has any VCPU been created
already?".  While x86 detects the race through kvm_vcpu_compatible,
it is kinda hackish and s390 does not do anything similar.  Provide a
better fix for both.

Paolo Bonzini (3):
  KVM: introduce created_vcpus
  KVM: remove kvm_vcpu_compatible
  KVM: s390: use created_vcpus

 arch/s390/kvm/kvm-s390.c | 10 +++++-----
 arch/x86/kvm/Kconfig     |  1 -
 arch/x86/kvm/x86.c       | 11 +++--------
 include/linux/kvm_host.h | 14 ++++++++------
 virt/kvm/Kconfig         |  3 ---
 virt/kvm/kvm_main.c      | 27 +++++++++++++++++----------
 6 files changed, 33 insertions(+), 33 deletions(-)

-- 
1.8.3.1