linux-kernel - Re: [PART2 RFC v1 1/9] iommu/amd: Detect and enable guest vAPIC support

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Message-ID: <20160509114927.GC13971@8bytes.org>
Date:	Mon, 9 May 2016 13:49:27 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc:	pbonzini@...hat.com, rkrcmar@...hat.com, bp@...en8.de,
	gleb@...nel.org, alex.williamson@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, wei@...hat.com,
	sherry.hurwitz@....com
Subject: Re: [PART2 RFC v1 1/9] iommu/amd: Detect and enable guest vAPIC
 support

On Fri, Apr 08, 2016 at 07:49:22AM -0500, Suthikulpanit, Suravee wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> 
> This patch introduces a new IOMMU driver parameter, amd_iommu_guest_ir,
> which can be used to specify different interrupt remapping mode for
> passthrough devices to VM guest:
>     * legacy: Legacy interrupt remapping mode (w/ 32-bit IRTE)
>     * ga    : Guest vAPIC interrupt remapping mode (w/ 128-bit IRTE)
> 
> Note that the GA mode also supports legacy interrupt remapping
> for non-passthrough devices with the 128-bit IRTE.

Does this need to be under user control? The code can just check what
the hardware supports and use the 128bit IRTEs if supported, no?



	Joerg