On Mon, Sep 26, 2022 at 11:33:11AM +0200, Igor Mammedov wrote: > On Fri, 23 Sep 2022 21:27:08 -0400 > Peter Xu <pet...@redhat.com> wrote: > > > On Fri, Sep 23, 2022 at 06:03:44PM -0400, Peter Xu wrote: > > > On Fri, Sep 23, 2022 at 10:41:59AM +0200, Igor Mammedov wrote: > > > > It's worth putting history excavation with explanation what is broken > > > > and why > > > > compat stuff is being ignored in the patch. > > > > > > Makes sense, I'll amend the commit message and repost. Thanks, > > > > There's actually one way to slightly remedy this single case, mostly for > > any QEMU 7.1.0 user with -smp <=8 and the intel iommu (as 77250171bdc02 is > > merged only in 7.1.0). > > > > We can have one compact parameter x-eim-enable-kvm-x2apic, setting it "on" > > by default, "off" for 7.1, and "on" for 7.0-. > > > > I'm not very sure whether that'll worth it. Any thoughts? > > How it (enabling x2apic API) would affect kvm/guests running with 8 or less > CPUs > and with intel iommu + remapping?
It's more from the guest ABI level, but indeed at least from what I see so far <=8 CPUs are fine. I'll keep the patch short, thanks. -- Peter Xu
