Ram Pai <linuxram@xxxxxxxxxx> writes: > XIVE interrupt controller uses an Event Queue (EQ) to enqueue event > notifications when an exception occurs. The EQ is a single memory page > provided by the O/S defining a circular buffer, one per server and > priority couple. > > On baremetal, the EQ page is configured with an OPAL call. On pseries, > an extra hop is necessary and the guest OS uses the hcall > H_INT_SET_QUEUE_CONFIG to configure the XIVE interrupt controller. > > The XIVE controller being Hypervisor privileged, it will not be allowed > to enqueue event notifications for a Secure VM unless the EQ pages are > shared by the Secure VM. > > Hypervisor/Ultravisor still requires support for the TIMA and ESB page > fault handlers. Until this is complete, QEMU can use the emulated XIVE > device for Secure VMs, option "kernel_irqchip=off" on the QEMU pseries > machine. > > Cc: kvm-ppc@xxxxxxxxxxxxxxx > Cc: linuxppc-dev@xxxxxxxxxxxxxxxx > Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > Cc: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx> > Cc: Michael Anderson <andmike@xxxxxxxxxxxxx> > Cc: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx> > Cc: Alexey Kardashevskiy <aik@xxxxxxxxx> > Cc: Paul Mackerras <paulus@xxxxxxxxxx> > Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx> > Reviewed-by: Cedric Le Goater <clg@xxxxxxxx> > Reviewed-by: Greg Kurz <groug@xxxxxxxx> > Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx> > > v3: fix a minor semantics in description. > and added reviewed-by from Cedric and Greg. > v2: better description of the patch from Cedric. > --- Please put the change history after the '---' break in future please, I had to fix this up manually. cheers
