linux-kernel - Re: [RFC PATCH 2/4] PCI: Add "pci=iommu_passthrough=" parameter for iommu passthrough

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Message-ID: <48576108-c261-1bb8-cea9-db3b6782f383@linux.intel.com>
Date:   Wed, 22 Jan 2020 12:49:24 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        ashok.raj@...el.com, jacob.jun.pan@...el.com, kevin.tian@...el.com,
        Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH 2/4] PCI: Add "pci=iommu_passthrough=" parameter for
 iommu passthrough

Hi Bjorn,

On 1/21/20 10:17 PM, Bjorn Helgaas wrote:
> [+cc linux-pci, thread athttps://lore.kernel.org/r/20200101052648.14295-1-baolu.lu@linux.intel.com]
> 
> On Wed, Jan 01, 2020 at 01:26:46PM +0800, Lu Baolu wrote:
>> The new parameter takes a list of devices separated by a semicolon.
>> Each device specified will have its iommu_passthrough bit in struct
>> device set. This is very similar to the existing 'disable_acs_redir'
>> parameter.
> Almost all of this patchset is in drivers/iommu.  Should the parameter
> be "iommu ..." instead of "pci=iommu_passthrough=..."?
> 
> There is already an "iommu.passthrough=" argument.  Would this fit
> better there?  Since the iommu_passthrough bit is generic, it seems
> like you anticipate similar situations for non-PCI devices.
> 

Yes. Fair enough.

Best regards,
baolu