From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Date: Wed, 30 Sep 2009 08:59:26 +0000 Subject: Re: [PATCH 00/27] Add KVM support for Book3s_64 (PPC64) hosts v4 Message-Id: <4AC31DEE.8010607@redhat.com> List-Id: References: <1254212303-8737-1-git-send-email-agraf@suse.de> In-Reply-To: <1254212303-8737-1-git-send-email-agraf@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-ppc@vger.kernel.org On 09/30/2009 10:47 AM, Alexander Graf wrote: >> >> What's the plan here? While not a requirement for merging, that's >> one of the kvm points of strength and I'd like to see it supported >> across the board. > > > I'm having a deja vu :-). Will probably get one on every repost. > > The plan is to get qemu ppc64 guest support in a shape where it can > actually use the KVM support. As it is it's rather useless. > When we have that, a PV interface would be needed to get things fast > and then the next thing on my list is the MMU notifiers. Um. How slow is it today? What paths are problematic? mmu, context switch? Our experience with pv on x86 has been mostly negative. It's not trivial to get security right, it ended up slower than non-pv, and hardware obsoleted it fairly quickly. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.