linux-kernel - RE: [PATCH V5 0/3] x86/Hyper-V/IOMMU: Add Hyper-V IOMMU driver to support x2apic mode

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Date:   Mon, 25 Feb 2019 20:51:22 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "joro@...tes.org" <joro@...tes.org>
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        KY Srinivasan <kys@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mchehab+samsung@...nel.org" <mchehab+samsung@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "x86@...nel.org" <x86@...nel.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 V5 0/3] x86/Hyper-V/IOMMU: Add Hyper-V IOMMU driver to
 support x2apic mode

From: Tianyu Lan <Tianyu.Lan@...rosoft.com> Sent: Friday, February 22, 2019 4:12 AM
> 
> On the bare metal, enabling X2APIC mode requires interrupt remapping
> function which helps to deliver irq to cpu with 32-bit APIC ID.
> Hyper-V doesn't provide interrupt remapping function so far and Hyper-V
> MSI protocol already supports to deliver interrupt to the CPU whose
> virtual processor index is more than 255. IO-APIC interrupt still has
> 8-bit APIC ID limitation.
> 
> This patchset is to add Hyper-V stub IOMMU driver in order to enable
> X2APIC mode successfully in Hyper-V Linux guest. The driver returns X2APIC
> interrupt remapping capability when X2APIC mode is available. X2APIC
> destination mode is set to physical by PATCH 1 when X2APIC is available.
> Hyper-V IOMMU driver will scan cpu 0~255 and set cpu into IO-APIC MAX cpu
> affinity cpumask if its APIC ID is 8-bit. Driver creates a Hyper-V irq domain
> to limit IO-APIC interrupts' affinity and make sure cpus assigned with IO-APIC
> interrupt are in the scope of IO-APIC MAX cpu affinity.
> 
> Lan Tianyu (3):
>   x86/Hyper-V: Set x2apic destination mode to physical when x2apic is
>      available
>   HYPERV/IOMMU: Add Hyper-V stub IOMMU driver
>   MAINTAINERS: Add Hyper-V IOMMU driver into Hyper-V CORE AND DRIVERS
>     scope
> 

Joerg -- What's your take on this patch set now that it has settled down?  If
you are good with it, from the Microsoft standpoint we're hoping that it
can get into linux-next this week (given the extra week due to 5.0-rc8).

Thanks,

Michael Kelley