linux_dsm_epyc7002/arch/powerpc/include
Paul Mackerras 0d4ee88d92 KVM: PPC: Book3S HV: Use new mutex to synchronize MMU setup
Currently the HV KVM code uses kvm->lock in conjunction with a flag,
kvm->arch.mmu_ready, to synchronize MMU setup and hold off vcpu
execution until the MMU-related data structures are ready.  However,
this means that kvm->lock is being taken inside vcpu->mutex, which
is contrary to Documentation/virtual/kvm/locking.txt and results in
lockdep warnings.

To fix this, we add a new mutex, kvm->arch.mmu_setup_lock, which nests
inside the vcpu mutexes, and is taken in the places where kvm->lock
was taken that are related to MMU setup.

Additionally we take the new mutex in the vcpu creation code at the
point where we are creating a new vcore, in order to provide mutual
exclusion with kvmppc_update_lpcr() and ensure that an update to
kvm->arch.lpcr doesn't get missed, which could otherwise lead to a
stale vcore->lpcr value.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2019-05-29 13:44:36 +10:00
..
asm KVM: PPC: Book3S HV: Use new mutex to synchronize MMU setup 2019-05-29 13:44:36 +10:00
uapi/asm KVM: PPC: Book3S HV: XIVE: Add a mapping for the source ESB pages 2019-04-30 19:35:16 +10:00