Re: Linux 5.15.103

[Sasha Levin]

On Tue, Mar 28, 2023 at 02:29:11PM +0200, Mathias Krause wrote:
> On 28.03.23 14:14, Greg Kroah-Hartman wrote:
> > On Tue, Mar 28, 2023 at 02:02:03PM +0200, Mathias Krause wrote:
> > > On 17.03.23 09:04, Greg Kroah-Hartman wrote:
> > > > I'm announcing the release of the 5.15.103 kernel.
> > > >
> > > > [...]
> > > >
> > > > Vitaly Kuznetsov (4):
> > > >       KVM: Optimize kvm_make_vcpus_request_mask() a bit
> > > >       KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request_except()
> > > >       KVM: nVMX: Don't use Enlightened MSR Bitmap for L3
> > > >       KVM: VMX: Introduce vmx_msr_bitmap_l01_changed() helper
> > >
> > > That list is missing commit 6470accc7ba9 ("KVM: x86: hyper-v: Avoid
> > > calling kvm_make_vcpus_request_mask() with vcpu_mask==NULL") to fulfill
> > > the prerequisite of "KVM: Optimize kvm_make_vcpus_request_mask() a bit".
> > >
> > > Right now the kvm selftests trigger a kernel NULL deref for the hyperv
> > > test, making the system hang.
> > >
> > > Please consider applying commit 6470accc7ba9 for the next v5.15.x release.
> >
> > It wasn't tagged for the stable kernels, so we didn't pick it up :(
>
> Neither were any of the above commits. o.O
>
> Commit 3e48a6349d29 ("KVM: Optimize kvm_make_vcpus_request_mask() a
> bit") has this tag, though:
>
> Stable-dep-of: 2b0128127373 ("KVM: Register /dev/kvm as the _very_ last
> thing during initialization")
>
> I don't know why, though. These two commits have little in common.
> Maybe Sasha knows why?

Because you've skipped the commit in the middle of the two you've
pointed out :)

3e48a6349d29 is needed by 0a0ecaf0988b ("KVM: Pre-allocate cpumasks for
kvm_make_all_cpus_request_except()"), which in turn is needed by
2b0128127373.

--
Thanks,
Sasha