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Date: Sun, 30 Sep 2012 20:05:16 -0300
From: Marcelo Tosatti <mtosatti@redhat.com>
Message-ID: <20120930230516.GA3923@amt.cnet>
References: <a7267230c907a452a2dbf96daae5332178044741.1348129517.git.amit.shah@redhat.com>
	<20120920124641.GA15092@amt.cnet>
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Subject: Re: [Qemu-devel] [PATCH 1/1] kvmclock: fix guest stop notification
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To: Amit Shah <amit.shah@redhat.com>
Cc: kvm list <kvm@vger.kernel.org>, Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>, qemu list <qemu-devel@nongnu.org>, Eric B Munson <emunson@mgebm.net>, Paolo Bonzini <pbonzini@redhat.com>, Laszlo Ersek <lersek@redhat.com>, Andreas =?iso-8859-1?Q?F=E4rber?= <afaerber@suse.de>

On Thu, Sep 20, 2012 at 09:46:41AM -0300, Marcelo Tosatti wrote:
> On Thu, Sep 20, 2012 at 01:55:20PM +0530, Amit Shah wrote:
> > Commit f349c12c0434e29c79ecde89029320c4002f7253 added the guest stop
> > notification, but it did it in a way that the stop notification would
> > never reach the kernel.  The kvm_vm_state_changed() function gets a
> > value of 0 for the 'running' parameter when the VM is stopped, making
> > all the code added previously dead code.
> >=20
> > This patch reworks the code so that it's called when 'running' is 0,
> > which indicates the VM was stopped.
> >=20
> > CC: Eric B Munson <emunson@mgebm.net>
> > CC: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
> > CC: Andreas F=E4rber <afaerber@suse.de>
> > CC: Marcelo Tosatti <mtosatti@redhat.com>
> > CC: Paolo Bonzini <pbonzini@redhat.com>
> > CC: Laszlo Ersek <lersek@redhat.com>
> > Signed-off-by: Amit Shah <amit.shah@redhat.com>
> > ---
> >  hw/kvm/clock.c |   21 +++++++++++----------
> >  1 files changed, 11 insertions(+), 10 deletions(-)
> >=20
> > diff --git a/hw/kvm/clock.c b/hw/kvm/clock.c
> > index 824b978..f3427eb 100644
> > --- a/hw/kvm/clock.c
> > +++ b/hw/kvm/clock.c
> > @@ -71,18 +71,19 @@ static void kvmclock_vm_state_change(void *opaque=
, int running,
> > =20
> >      if (running) {
> >          s->clock_valid =3D false;
> > +        return;
> > +    }
> > =20
> > -        if (!cap_clock_ctrl) {
> > -            return;
> > -        }
> > -        for (penv =3D first_cpu; penv !=3D NULL; penv =3D penv->next=
_cpu) {
> > -            ret =3D kvm_vcpu_ioctl(penv, KVM_KVMCLOCK_CTRL, 0);
> > -            if (ret) {
> > -                if (ret !=3D -EINVAL) {
> > -                    fprintf(stderr, "%s: %s\n", __func__, strerror(-=
ret));
> > -                }
> > -                return;
> > +    if (!cap_clock_ctrl) {
> > +        return;
> > +    }
> > +    for (penv =3D first_cpu; penv !=3D NULL; penv =3D penv->next_cpu=
) {
> > +        ret =3D kvm_vcpu_ioctl(penv, KVM_KVMCLOCK_CTRL, 0);
> > +        if (ret) {
> > +            if (ret !=3D -EINVAL) {
> > +                fprintf(stderr, "%s: %s\n", __func__, strerror(-ret)=
);
> >              }
> > +            return;
> >          }
> >      }
> >  }
> > --=20
> > 1.7.7.6
>=20
> ACK
>=20
> Avi, please merge through uq/master.

NACK, guest should be notified when the VM is starting, not
when stopping.