From: Jason Gunthorpe via iommu <iommu@lists.linux-foundation.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Allen Hubbe <allenbh@gmail.com>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
"Tian, Kevin" <kevin.tian@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"Jiang, Dave" <dave.jiang@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Marc Zygnier <maz@kernel.org>, Heiko Carstens <hca@linux.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Alex Williamson <alex.williamson@redhat.com>,
"Rodel, Jorg" <jroedel@suse.de>,
Bjorn Helgaas <helgaas@kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-ntb@googlegroups.com" <linux-ntb@googlegroups.com>,
Logan Gunthorpe <logang@deltatee.com>,
"Dey, Megha" <megha.dey@intel.com>
Subject: Re: [patch 21/32] NTB/msi: Convert to msi_on_each_desc()
Date: Sun, 12 Dec 2021 19:37:11 -0400 [thread overview]
Message-ID: <20211212233711.GN6385@nvidia.com> (raw)
In-Reply-To: <87fsqxv8zf.ffs@tglx>
On Sun, Dec 12, 2021 at 09:55:32PM +0100, Thomas Gleixner wrote:
> Kevin,
>
> On Sun, Dec 12 2021 at 01:56, Kevin Tian wrote:
> >> From: Thomas Gleixner <tglx@linutronix.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.
Kevin can you explain what on earth vIR is for and how does it work??
Obviously we don't expose the IR machinery to userspace, so at best
this is somehow changing what the MSI trap does?
Jason
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next prev parent reply other threads:[~2021-12-12 23:37 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20211126230957.239391799@linutronix.de>
[not found] ` <20211126232735.547996838@linutronix.de>
[not found] ` <7daba0e2-73a3-4980-c3a5-a71f6b597b22@deltatee.com>
[not found] ` <874k7ueldt.ffs@tglx>
[not found] ` <6ba084d6-2b26-7c86-4526-8fcd3d921dfd@deltatee.com>
[not found] ` <87ilwacwp8.ffs@tglx>
[not found] ` <d6f13729-1b83-fa7d-3f0d-98d4e3f7a2aa@deltatee.com>
[not found] ` <87v909bf2k.ffs@tglx>
[not found] ` <20211130202800.GE4670@nvidia.com>
[not found] ` <87o861banv.ffs@tglx>
[not found] ` <20211201001748.GF4670@nvidia.com>
2021-12-01 10:16 ` [patch 21/32] NTB/msi: Convert to msi_on_each_desc() Thomas Gleixner
2021-12-01 13:00 ` Jason Gunthorpe via iommu
2021-12-01 17:35 ` Thomas Gleixner
2021-12-01 18:14 ` Jason Gunthorpe via iommu
2021-12-01 18:46 ` Logan Gunthorpe
2021-12-01 20:21 ` Thomas Gleixner
2021-12-02 0:01 ` Thomas Gleixner
2021-12-02 13:55 ` Jason Gunthorpe via iommu
2021-12-02 14:23 ` Greg Kroah-Hartman
2021-12-02 14:45 ` Jason Gunthorpe via iommu
2021-12-02 19:25 ` Thomas Gleixner
2021-12-02 20:00 ` Jason Gunthorpe via iommu
2021-12-02 22:31 ` Thomas Gleixner
2021-12-03 0:37 ` Jason Gunthorpe via iommu
2021-12-03 15:07 ` Thomas Gleixner
2021-12-03 16:41 ` Jason Gunthorpe via iommu
2021-12-04 14:20 ` Thomas Gleixner
2021-12-05 14:16 ` Thomas Gleixner
2021-12-06 14:43 ` Jason Gunthorpe via iommu
2021-12-06 15:47 ` Thomas Gleixner
2021-12-06 17:00 ` Jason Gunthorpe via iommu
2021-12-06 20:28 ` Thomas Gleixner
2021-12-06 21:06 ` Jason Gunthorpe via iommu
2021-12-06 22:21 ` Thomas Gleixner
2021-12-06 14:19 ` Jason Gunthorpe via iommu
2021-12-06 15:06 ` Thomas Gleixner
2021-12-09 6:26 ` Tian, Kevin
2021-12-09 9:03 ` Thomas Gleixner
2021-12-09 12:17 ` Tian, Kevin
2021-12-09 15:57 ` Thomas Gleixner
2021-12-10 7:37 ` Tian, Kevin
2021-12-09 5:41 ` Tian, Kevin
2021-12-09 5:47 ` Jason Wang
2021-12-01 16:28 ` Dave Jiang
2021-12-01 18:41 ` Thomas Gleixner
2021-12-01 18:47 ` Dave Jiang
2021-12-01 20:25 ` Thomas Gleixner
2021-12-01 21:21 ` Dave Jiang
2021-12-01 21:44 ` Thomas Gleixner
2021-12-01 21:49 ` Dave Jiang
2021-12-01 22:03 ` Thomas Gleixner
2021-12-01 22:53 ` Dave Jiang
2021-12-01 23:57 ` Thomas Gleixner
2021-12-09 5:23 ` Tian, Kevin
2021-12-09 8:37 ` Thomas Gleixner
2021-12-09 12:31 ` Tian, Kevin
2021-12-09 16:21 ` Jason Gunthorpe via iommu
2021-12-09 20:32 ` Thomas Gleixner
2021-12-09 20:58 ` Jason Gunthorpe via iommu
2021-12-09 22:09 ` Thomas Gleixner
2021-12-10 0:26 ` Thomas Gleixner
2021-12-10 7:29 ` Tian, Kevin
2021-12-10 12:13 ` Thomas Gleixner
2021-12-11 8:06 ` Tian, Kevin
2021-12-10 12:39 ` Jason Gunthorpe via iommu
2021-12-10 19:00 ` Thomas Gleixner
2021-12-11 7:44 ` Tian, Kevin
2021-12-11 13:04 ` Thomas Gleixner
2021-12-12 1:56 ` Tian, Kevin
2021-12-12 20:55 ` Thomas Gleixner
2021-12-12 23:37 ` Jason Gunthorpe via iommu [this message]
2021-12-13 7:50 ` Tian, Kevin
2021-12-11 7:52 ` Tian, Kevin
2021-12-12 0:12 ` Thomas Gleixner
2021-12-12 2:14 ` Tian, Kevin
2021-12-12 20:50 ` Thomas Gleixner
2021-12-12 23:42 ` Jason Gunthorpe via iommu
2021-12-10 7:36 ` Tian, Kevin
2021-12-10 12:30 ` Jason Gunthorpe via iommu
2021-12-12 6:44 ` Mika Penttilä
2021-12-12 23:27 ` Jason Gunthorpe via iommu
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