On Fri, 5 Jul 2019 17:32:49 +0200 Christian Borntraeger <borntrae...@de.ibm.com> wrote:
> From: Pierre Morel <pmo...@linux.ibm.com> > > Let's add support for the AP-Queue interruption facility to the CPU > model. > > The S390_FEAT_AP_QUEUE_INTERRUPT_CONTROL, CPU facility indicates > whether the PQAP instruction with the AQIC command is available > to the guest. > This feature will be enabled only if the AP instructions are > available on the linux host and AQIC facility is installed on > the host. > > This feature must be turned on from userspace to intercept AP > instructions on the KVM guest. The QEMU command line to turn > this feature on looks something like this: > > qemu-system-s390x ... -cpu xxx,apqi=on ... > or > ... -cpu host > > Right now AP pass-through devices do not support migration, > which means that we do not have to take care of migrating > the interrupt data: > virsh migrate apguest --live qemu+ssh://r...@target.lan/system > error: Requested operation is not valid: domain has assigned non-USB host > devices > > Signed-off-by: Pierre Morel <pmo...@linux.ibm.com> > Reviewed-by: Tony Krowiak <akrow...@linux.ibm.com> > Reviewed-by: Christian Borntraeger <borntrae...@de.ibm.com> > Reviewed-by: Halil Pasic <pa...@linux.ibm.com> > Signed-off-by: Christian Borntraeger <borntrae...@de.ibm.com> > [rebase to newest qemu and fixup description] > --- > target/s390x/cpu_features_def.inc.h | 1 + > target/s390x/cpu_models.c | 1 + > target/s390x/gen-features.c | 1 + > 3 files changed, 3 insertions(+) While technically a tad late for 4.1, this is a small and straightforward patch (that already had been on the list earlier), so I went ahead and applied it.
