Re: [RFC PATCH 16/42] iommufd: Enable device feature IOPF during device attachment to KVM HWPT

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Subject: Re: [RFC PATCH 16/42] iommufd: Enable device feature IOPF during device attachment to KVM HWPT
From: Yan Zhao <yan.y.zhao@xxxxxxxxx>
Date: Wed, 6 Dec 2023 08:55:47 +0800
Cc: <iommu@xxxxxxxxxxxxxxx>, <kvm@xxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <alex.williamson@xxxxxxxxxx>, <pbonzini@xxxxxxxxxx>, <seanjc@xxxxxxxxxx>, <joro@xxxxxxxxxx>, <will@xxxxxxxxxx>, <robin.murphy@xxxxxxx>, <kevin.tian@xxxxxxxxx>, <baolu.lu@xxxxxxxxxxxxxxx>, <dwmw2@xxxxxxxxxxxxx>, <yi.l.liu@xxxxxxxxx>
In-reply-to: <20231205145341.GF2787277@nvidia.com>
References: <20231202091211.13376-1-yan.y.zhao@intel.com> <20231202092311.14392-1-yan.y.zhao@intel.com> <20231204183603.GN1493156@nvidia.com> <ZW7NwSCzswweHZh6@yzhao56-desk.sh.intel.com> <20231205145341.GF2787277@nvidia.com>
Reply-to: Yan Zhao <yan.y.zhao@xxxxxxxxx>

On Tue, Dec 05, 2023 at 10:53:41AM -0400, Jason Gunthorpe wrote:
> On Tue, Dec 05, 2023 at 03:14:09PM +0800, Yan Zhao wrote:
> 
> > > I would like to remove IOMMU_DEV_FEAT_IOPF completely please
> > 
> > So, turn on device PRI during device attachment in IOMMU vendor driver?
> 
> If a fault requesting domain is attached then PRI should just be
> enabled in the driver
>
Right, it makes sense!

References:
- [RFC PATCH 00/42] Sharing KVM TDP to IOMMU
  - From: Yan Zhao
- [RFC PATCH 16/42] iommufd: Enable device feature IOPF during device attachment to KVM HWPT
  - From: Yan Zhao
- Re: [RFC PATCH 16/42] iommufd: Enable device feature IOPF during device attachment to KVM HWPT
  - From: Jason Gunthorpe
- Re: [RFC PATCH 16/42] iommufd: Enable device feature IOPF during device attachment to KVM HWPT
  - From: Yan Zhao
- Re: [RFC PATCH 16/42] iommufd: Enable device feature IOPF during device attachment to KVM HWPT
  - From: Jason Gunthorpe

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