linux-kernel - RE: [patch 21/32] NTB/msi: Convert to msi_on_each

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Message-ID: <875yrvwavf.ffs@tglx>
Date:   Sat, 11 Dec 2021 14:04:52 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     "Jiang, Dave" <dave.jiang@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Dey, Megha" <megha.dey@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Mason <jdmason@...zu.us>, Allen Hubbe <allenbh@...il.com>,
        "linux-ntb@...glegroups.com" <linux-ntb@...glegroups.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <jroedel@...e.de>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: RE: [patch 21/32] NTB/msi: Convert to msi_on_each_desc()

Kevin,

On Sat, Dec 11 2021 at 07:44, Kevin Tian wrote:
>> From: Thomas Gleixner <tglx@...utronix.de>
>> On Fri, Dec 10 2021 at 08:39, Jason Gunthorpe wrote:
>> > It is clever, we don't have an vIOMMU that supplies vIR today, so by
>> > definition all guests are excluded and only bare metal works.
>> 
>> Dammit. Now you spilled the beans. :)
>
> Unfortunately we do have that today. Qemu supports IR for
> both AMD and Intel vIOMMU.

can you point me to the code?

All I can find is drivers/iommu/virtio-iommu.c but I can't find anything
vIR related there.

Thanks,

        tglx