On Fri, Mar 20, 2015 at 12:01:32PM +0100, Alexander Graf wrote: > > > On 20.03.15 10:39, Paul Mackerras wrote: > > From: Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx> > > > > Since KVM isn't equipped to handle closure of vcpu fd from userspace(QEMU) > > correctly, certain work arounds have to be employed to allow reuse of > > vcpu array slot in KVM during cpu hot plug/unplug from guest. One such > > proposed workaround is to park the vcpu fd in userspace during cpu unplug > > and reuse it later during next hotplug. > > > > More details can be found here: > > KVM: https://www.mail-archive.com/kvm@xxxxxxxxxxxxxxx/msg102839.html > > QEMU: http://lists.gnu.org/archive/html/qemu-devel/2014-12/msg00859.html > > > > In order to support this workaround with PowerPC KVM, don't create or > > initialize ICP if the vCPU is found to be already associated with an ICP. > > > > Signed-off-by: Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx> > > Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx> > > This probably makes some sense, but please make sure that user space has > some way to figure out whether hotplug works at all. Bharata is working on the qemu side of all this, so I assume he has that covered. > Also Paul, for patches that you pick up from others, I'd prefer if they > send the patches to the ML themselves first and you pick them up from > there then. That way we give everyone the same treatment. Fair enough. In fact Bharata did post the patch but he sent it to linuxppc-dev@xxxxxxxxxx not the KVM lists. Paul. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
