RE: [PATCH] iommu/vt-d: Enhance capability check for nested parent domain allocation

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To: "Liu, Yi L" <yi.l.liu@xxxxxxxxx>, "joro@xxxxxxxxxx" <joro@xxxxxxxxxx>, "alex.williamson@xxxxxxxxxx" <alex.williamson@xxxxxxxxxx>, "jgg@xxxxxxxxxx" <jgg@xxxxxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "baolu.lu@xxxxxxxxxxxxxxx" <baolu.lu@xxxxxxxxxxxxxxx>
Subject: RE: [PATCH] iommu/vt-d: Enhance capability check for nested parent domain allocation
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Wed, 25 Oct 2023 07:37:24 +0000
Accept-language: en-US
Cc: "cohuck@xxxxxxxxxx" <cohuck@xxxxxxxxxx>, "eric.auger@xxxxxxxxxx" <eric.auger@xxxxxxxxxx>, "nicolinc@xxxxxxxxxx" <nicolinc@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "mjrosato@xxxxxxxxxxxxx" <mjrosato@xxxxxxxxxxxxx>, "chao.p.peng@xxxxxxxxxxxxxxx" <chao.p.peng@xxxxxxxxxxxxxxx>, "yi.y.sun@xxxxxxxxxxxxxxx" <yi.y.sun@xxxxxxxxxxxxxxx>, "peterx@xxxxxxxxxx" <peterx@xxxxxxxxxx>, "jasowang@xxxxxxxxxx" <jasowang@xxxxxxxxxx>, "shameerali.kolothum.thodi@xxxxxxxxxx" <shameerali.kolothum.thodi@xxxxxxxxxx>, "lulu@xxxxxxxxxx" <lulu@xxxxxxxxxx>, "suravee.suthikulpanit@xxxxxxx" <suravee.suthikulpanit@xxxxxxx>, "iommu@xxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-kselftest@xxxxxxxxxxxxxxx" <linux-kselftest@xxxxxxxxxxxxxxx>, "Duan, Zhenzhong" <zhenzhong.duan@xxxxxxxxx>, "Martins, Joao" <joao.m.martins@xxxxxxxxxx>
In-reply-to: <20231024150011.44642-1-yi.l.liu@intel.com>
Thread-index: AQHaBorb53ixZf3YA0SmpGP4jnQvU7BaHwOQ
Thread-topic: [PATCH] iommu/vt-d: Enhance capability check for nested parent domain allocation

> From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
> Sent: Tuesday, October 24, 2023 11:00 PM
> 
> This adds the scalable mode check before allocating the nested parent
> domain
> as checking nested capability is not enough. User may turn off scalable mode
> which also means no nested support even if the hardware supports it.
> 
> Fixes: c97d1b20d383 ("iommu/vt-d: Add domain_alloc_user op")
> Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

References:
- [PATCH] iommu/vt-d: Enhance capability check for nested parent domain allocation
  - From: Yi Liu

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