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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 12 Jun 2018 20:26:46 -0700
Message-ID: <CA+55aFxZNyHoytCNV89tPP0TWEiR_-nOja-HA5i4zY446VFCVA@mail.gmail.com>
Subject: Re: [GIT PULL] KVM changes for 4.18 merge window
To:     Wanpeng Li <kernellwp@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Thomas Richter <tmricht@linux.ibm.com>,
        Kees Cook <keescook@chromium.org>
Cc:     Paolo Bonzini <pbonzini@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        KVM list <kvm@vger.kernel.org>
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On Tue, Jun 12, 2018 at 8:00 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> Yeah, the biusection seems to actually be diving into Greg's device pulls.
>
> Odd. I'm not seeing why that would break kvm, but maybe there's
> something in the device core layer that really messed it up.
>
> I'll continue to bisect to see.

Ok, so commit 95cde3c59966 ("debugfs: inode: debugfs_create_dir uses
mode permission from parent") breaks lkvm, and I think qemu-kvm too.

The commit looks like the RightThing(tm) to do, but we do not break
existing work-flows, no matter how much we'd like to.  So it gets
reverted.

Greg, Thomas, perhaps some alternative model? I'm not sure exactly
what kvm needs from debugfs.

                   Linus