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

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Message-ID: <200952f3-d09d-222f-7d07-99335f18b9da@amd.com>
Date:   Tue, 18 Jun 2019 14:34:42 +0000
From:   "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
To:     Maxim Levitsky <mlevitsk@...hat.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

Hi,

On 6/15/19 9:28 AM, Maxim Levitsky wrote:
> 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.

I'm still working on this and testing the series.
I'll post this soon.

Thanks,
Suravee

> Best regards,
> 	Maxim Levitsky
>