linux-kernel - Re: [RFC PATCH 8/8] svm: Allow AVIC with in-kernel irqchip mode

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Message-ID: <1d80a586342dfee0479db96a4457f7023b0260a9.camel@redhat.com>
Date:   Sat, 15 Jun 2019 17:28:50 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "jsteckli@...zon.de" <jsteckli@...zon.de>,
        "sironi@...zon.de" <sironi@...zon.de>,
        "wawei@...zon.de" <wawei@...zon.de>
Subject: Re: [RFC PATCH 8/8] svm: Allow AVIC with in-kernel irqchip mode

On Wed, 2019-02-06 at 11:20 +0000, Suthikulpanit, Suravee wrote:
> Alex,
> 
> On 2/6/19 1:34 AM, Alex Williamson wrote:
> > On Mon, 4 Feb 2019 14:42:32 +0000
> > "Suthikulpanit, Suravee"<Suravee.Suthikulpanit@....com>  wrote:
> > 
> > > Once the IRQ ack notifier for in-kernel PIT is no longer required
> > > and run-time AVIC activate/deactivate is supported, we can remove
> > > the kernel irqchip split mode requirement for AVIC.
> > > 
> > > Hence, remove the check for irqchip split mode when enabling AVIC.
> > 
> > Yay!  Could we also at this point make avic enabled by default or are
> > there remaining incompatibilities?  Thanks,
> 
> I'm looking into that next. I would need to ensure that enabling
> AVIC would not cause issues with other features.
> 
> Suravee

Hi!

Do you have any update on the state of this patch? 
I kind of stumbled on it accidently, while
trying to understand why AVIC is only enabled in the split irqchip mode.

Best regards,
	Maxim Levitsky