linux-kernel - RE: [RFC PATCH 00/42] Sharing KVM TDP to IOMMU

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Date:   Tue, 5 Dec 2023 06:30:31 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        "Zhao, Yan Y" <yan.y.zhao@...el.com>
CC:     "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [RFC PATCH 00/42] Sharing KVM TDP to IOMMU

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Monday, December 4, 2023 11:08 PM
> 
> On Sat, Dec 02, 2023 at 05:12:11PM +0800, Yan Zhao wrote:
> > - How to map MSI page on arm platform demands discussions.
> 
> Yes, the recurring problem :(
> 
> Probably the same approach as nesting would work for a hack - map the
> ITS page into the fixed reserved slot and tell the guest not to touch
> it and to identity map it.
> 

yes logically it should follow what is planned for nesting.

just that kvm needs to involve more iommu specific knowledge e.g.
iommu_get_msi_cookie() to reserve the slot.