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Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and
From: |
Daniel P . Berrangé |
Subject: |
Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends |
Date: |
Fri, 29 Jun 2018 16:19:58 +0100 |
User-agent: |
Mutt/1.10.0 (2018-05-17) |
On Fri, Jun 29, 2018 at 05:18:21PM +0200, Igor Mammedov wrote:
> On Fri, 29 Jun 2018 12:14:05 +0100
> Daniel P. Berrangé <address@hidden> wrote:
>
> > On Fri, Jun 29, 2018 at 01:08:38PM +0200, Paolo Bonzini wrote:
> > > On 29/06/2018 13:07, Greg Kurz wrote:
> > > >>>> Also asserting current_machine != NULL is not necessary, since you're
> > > >>>> immediately dereferencing it.
> > > >>> Is there a practical way to simply initialize the accelerators earlier
> > > >>> in startup sequence, so we just remove or at least reduce, the
> > > >>> liklihood
> > > >>> of accessing it too early ?
> > > >> We can try, though not for 3.0 of course.
> > > >>
> > > > FWIW, the motivation for this patch was kvm_enabled() being called under
> > > > the class_init function of the machine TypeInfo. This happens way
> > > > earlier
> > > > than accelerator init. Not sure this is doable, but I can have a look.
> > > >
> > >
> > > Probably not, that's way too early indeed.
> >
> > Yeah, doing anything non-trivial in class_init is just asking for trouble,
> > as conceivably nothing is initialized at that point.
> isn't class_init called lazily? (so it might actually work as far as type
> isn't touched before kvm is initialized)
Yes, but I don't think anything should rely on it being lazy, as such an
assumption is liable to break any time code is refactored, subtley changing
class init ordering.
Regards,
Daniel
--
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- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, (continued)
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Paolo Bonzini, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Daniel P . Berrangé, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Paolo Bonzini, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Greg Kurz, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Paolo Bonzini, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Daniel P . Berrangé, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Cédric Le Goater, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Paolo Bonzini, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Eduardo Habkost, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Igor Mammedov, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends,
Daniel P . Berrangé <=
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Eduardo Habkost, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Eduardo Habkost, 2018/06/29
- Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Eduardo Habkost, 2018/06/29
Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends, Greg Kurz, 2018/06/29