linux-kernel - Re: [RFC PATCH v3 1/2] iommu: Add capability IOMMU_CAP

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Message-ID: <20210115063108.GI944463@unreal>
Date:   Fri, 15 Jan 2021 08:31:08 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     tglx@...utronix.de, ashok.raj@...el.com, kevin.tian@...el.com,
        dave.jiang@...el.com, megha.dey@...el.com, dwmw2@...radead.org,
        alex.williamson@...hat.com, bhelgaas@...gle.com,
        dan.j.williams@...el.com, will@...nel.org, joro@...tes.org,
        dmaengine@...r.kernel.org, eric.auger@...hat.com,
        jacob.jun.pan@...el.com, jgg@...lanox.com, kvm@...r.kernel.org,
        kwankhede@...dia.com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
        maz@...nel.org, mona.hossain@...el.com, netanelg@...lanox.com,
        parav@...lanox.com, pbonzini@...hat.com, rafael@...nel.org,
        samuel.ortiz@...el.com, sanjay.k.kumar@...el.com,
        shahafs@...lanox.com, tony.luck@...el.com, vkoul@...nel.org,
        yan.y.zhao@...ux.intel.com, yi.l.liu@...el.com
Subject: Re: [RFC PATCH v3 1/2] iommu: Add capability IOMMU_CAP_VIOMMU

On Fri, Jan 15, 2021 at 07:49:47AM +0800, Lu Baolu wrote:
> Hi Leon,
>
> On 1/14/21 9:26 PM, Leon Romanovsky wrote:
> > On Thu, Jan 14, 2021 at 09:30:02AM +0800, Lu Baolu wrote:
> > > Some vendor IOMMU drivers are able to declare that it is running in a VM
> > > context. This is very valuable for the features that only want to be
> > > supported on bare metal. Add a capability bit so that it could be used.
> >
> > And how is it used? Who and how will set it?
>
> Use the existing iommu_capable(). I should add more descriptions about
> who and how to use it.

I want to see the code that sets this capability.

Thanks