From: Jason Gunthorpe <jgg@ziepe.ca>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Alex Williamson <alex.williamson@redhat.com>,
kvm@vger.kernel.org, quic_bqiang@quicinc.com, kvalo@kernel.org,
prestwoj@gmail.com, linux-wireless@vger.kernel.org,
ath11k@lists.infradead.org, iommu@lists.linux.dev,
kernel@quicinc.com, johannes@sipsolutions.net,
jtornosm@redhat.com
Subject: Re: [PATCH RFC/RFT] vfio/pci: Create feature to disable MSI virtualization
Date: Fri, 3 Jan 2025 10:31:38 -0400 [thread overview]
Message-ID: <20250103143138.GC26854@ziepe.ca> (raw)
In-Reply-To: <03fdfde8dc05ecce1f1edececf0800d8cb919ac1.camel@infradead.org>
On Fri, Dec 13, 2024 at 09:10:30AM +0000, David Woodhouse wrote:
> <fantasy>
> A: The guest OS just hands the device a standard MSI message encoding
> the target guest APIC ID and vector (etc.), and the IOMMU does the
> rest. Nothing 'intercedes' between the guest and the device to mess
> with that MSI message.
> /me wakes up...
Well, I share your dream at least. :\
Have the VMM shadow the virtual interrupt remapping tables and assign
it to the phyiscal remapping so that the physical addr/data pair
doesn't change. Driving interrupt routing fully via the remapping HW
and not via MSI interception.
IIRC Alex had a patch series for qemu to capture and rewrite the ath
non-standard MSI locations, so virtualization worries should not block
moving ath to use the device-specific MSI..
Jason
next prev parent reply other threads:[~2025-01-03 14:31 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-08 13:17 ath11k and vfio-pci support James Prestwood
2024-01-10 9:00 ` Kalle Valo
2024-01-10 13:04 ` James Prestwood
2024-01-10 13:49 ` Kalle Valo
2024-01-10 14:55 ` James Prestwood
2024-01-11 3:51 ` Baochen Qiang
2024-01-11 8:16 ` Kalle Valo
2024-01-11 12:48 ` James Prestwood
2024-01-11 13:11 ` Kalle Valo
2024-01-11 13:38 ` James Prestwood
2024-01-12 2:04 ` Baochen Qiang
2024-01-12 12:47 ` James Prestwood
2024-01-14 12:37 ` Baochen Qiang
2024-01-14 14:36 ` Kalle Valo
2024-01-15 17:46 ` Alex Williamson
2024-01-16 10:08 ` Baochen Qiang
2024-01-16 10:41 ` David Woodhouse
2024-01-16 15:29 ` Jason Gunthorpe
2024-01-16 18:28 ` Alex Williamson
2024-01-16 21:10 ` Jeff Johnson
2024-01-17 5:47 ` Baochen Qiang
2024-03-21 19:14 ` Johannes Berg
2024-01-16 13:05 ` James Prestwood
2024-01-17 5:26 ` Baochen Qiang
2024-01-17 13:20 ` James Prestwood
2024-01-17 13:43 ` Kalle Valo
2024-01-17 14:25 ` James Prestwood
2024-01-18 2:09 ` Baochen Qiang
2024-01-19 17:52 ` James Prestwood
2024-01-19 17:57 ` Kalle Valo
2024-01-19 18:07 ` James Prestwood
2024-01-26 18:20 ` James Prestwood
2024-01-27 4:31 ` Baochen Qiang
2024-08-12 16:59 ` [PATCH RFC/RFT] vfio/pci: Create feature to disable MSI virtualization Alex Williamson
2024-08-13 16:30 ` Jason Gunthorpe
2024-08-13 17:30 ` Thomas Gleixner
2024-08-13 23:39 ` Jason Gunthorpe
2024-12-13 9:10 ` David Woodhouse
2025-01-03 14:31 ` Jason Gunthorpe [this message]
2025-01-03 14:47 ` David Woodhouse
2025-01-03 15:19 ` Jason Gunthorpe
2024-08-13 21:14 ` Alex Williamson
2024-08-13 23:16 ` Jason Gunthorpe
2024-08-14 14:55 ` Alex Williamson
2024-08-14 15:20 ` Jason Gunthorpe
2024-08-12 17:00 ` [PATCH RFC/RFT] vfio/pci-quirks: Quirk for ath wireless Alex Williamson
2024-08-13 16:43 ` Jason Gunthorpe
2024-08-13 21:03 ` Alex Williamson
2024-08-13 23:37 ` Jason Gunthorpe
2024-08-15 16:59 ` Alex Williamson
2024-08-15 17:19 ` Jason Gunthorpe
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