On Fri, May 24, 2019 at 03:20:30PM +0200, Cédric Le Goater wrote: > The XICS-on-XIVE KVM device needs to allocate XIVE event queues when a > priority is used by the OS. This is referred as EQ provisioning and it > is done under the hood when : > > 1. a CPU is hot-plugged in the VM > 2. the "set-xive" is called at VM startup > 3. sources are restored at VM restore > > The kvm->lock mutex is used to protect the different XIVE structures > being modified but in some contextes, kvm->lock is taken under the > vcpu->mutex which is a forbidden sequence by KVM. > > Introduce a new mutex 'lock' for the KVM devices for them to > synchronize accesses to the XIVE device structures. > > Signed-off-by: Cédric Le Goater <clg@xxxxxxxx> Thanks, patch applied to my kvm-ppc-fixes branch (with the headline "KVM: PPC: Book3S HV: XIVE: Introduce a new mutex for the XIVE device"). Paul.
