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Date: Sun, 12 Dec 2021 21:55:32 +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>, "Rodel, Jorg" <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 Sun, Dec 12 2021 at 01:56, Kevin Tian wrote:
>> From: Thomas Gleixner <tglx@...utronix.de>
>> All I can find is drivers/iommu/virtio-iommu.c but I can't find anything
>> vIR related there.
>
> Well, virtio-iommu is a para-virtualized vIOMMU implementations.
>
> In reality there are also fully emulated vIOMMU implementations (e.g.
> Qemu fully emulates Intel/AMD/ARM IOMMUs). In those configurations
> the IR logic in existing iommu drivers just apply:
>
> drivers/iommu/intel/irq_remapping.c
> drivers/iommu/amd/iommu.c
thanks for the explanation. So that's a full IOMMU emulation. I was more
expecting a paravirtualized lightweight one.
Thanks,
tglx
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