linux-kernel - RE: [PATCH V4 1/3] x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available

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Message-ID: <DM5PR2101MB0918F78D1E8682FF545519F8D77E0@DM5PR2101MB0918.namprd21.prod.outlook.com>
Date:   Thu, 21 Feb 2019 17:00:53 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "lantianyu1986@...il.com" <lantianyu1986@...il.com>
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "mchehab+samsung@...nel.org" <mchehab+samsung@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        vkuznets <vkuznets@...hat.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: RE: [PATCH V4 1/3] x86/Hyper-V: Set x2apic destination mode to
 physical when x2apic is available

From: lantianyu1986@...il.com <lantianyu1986@...il.com> Sent: Monday, February 11, 2019 6:20 AM
> 
> Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic,
> set x2apic destination mode to physcial mode when x2apic is available
> and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs have
> 8-bit APIC id.
> 
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> ---
> Change since v2:
>        - Fix compile error due to x2apic_phys
>        - Fix comment indent
> Change since v1:
>        - Remove redundant extern for x2apic_phys
> 
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>