RE: [PATCH iommufd 0/9] Remove IOMMU_CAP_INTR_REMAP

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To: Jason Gunthorpe <jgg@xxxxxxxxxx>, Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, "Lu Baolu" <baolu.lu@xxxxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, "David Woodhouse" <dwmw2@xxxxxxxxxxxxx>, Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, "Heiko Carstens" <hca@xxxxxxxxxxxxx>, "iommu@xxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "linux-s390@xxxxxxxxxxxxxxx" <linux-s390@xxxxxxxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Sven Schnelle <svens@xxxxxxxxxxxxx>, "Thomas Gleixner" <tglx@xxxxxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>
Subject: RE: [PATCH iommufd 0/9] Remove IOMMU_CAP_INTR_REMAP
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Fri, 9 Dec 2022 05:54:46 +0000
Accept-language: en-US
Cc: Bharat Bhushan <bharat.bhushan@xxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Eric Auger <eric.auger@xxxxxxxxxx>, Eric Farman <farman@xxxxxxxxxxxxx>, Marc Zyngier <marc.zyngier@xxxxxxx>, Matthew Rosato <mjrosato@xxxxxxxxxxxxx>, Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxxxxxxxxxx>, Will Deacon <will.deacon@xxxxxxx>
In-reply-to: <0-v1-9e466539c244+47b5-secure_msi_jgg@nvidia.com>
References: <0-v1-9e466539c244+47b5-secure_msi_jgg@nvidia.com>
Thread-index: AQHZC0NsDzfSnppzvkKTrEmIXSp/jq5lDsSg
Thread-topic: [PATCH iommufd 0/9] Remove IOMMU_CAP_INTR_REMAP

> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Friday, December 9, 2022 4:26 AM
> 
> In real HW "secure MSI" is implemented in a few different ways:
> 
>  - x86 uses "interrupt remapping" which is a block that sits between
>    the device and APIC, that can "remap" the MSI MemWr using per-RID
>    tables. Part of the remapping is discarding, the per-RID tables
>    will not contain vectors that have not been enabled for the device.
> 

per-RID tables is true for AMD.

However for Intel VT-d it's per-IOMMU remapping table.

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