linux-kernel - Re: [PATCH 6/7] x86/boot/tboot: Move tboot_force

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Date:   Mon, 16 May 2022 15:06:28 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ning Sun <ning.sun@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Steve Wahl <steve.wahl@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] x86/boot/tboot: Move tboot_force_iommu() to Intel
 IOMMU

On Sat, May 14, 2022 at 09:43:21AM +0800, Lu Baolu wrote:
> tboot_force_iommu() is only called by the Intel IOMMU driver. Move the
> helper into that driver. No functional change intended.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  include/linux/tboot.h       |  2 --
>  arch/x86/kernel/tboot.c     | 15 ---------------
>  drivers/iommu/intel/iommu.c | 14 ++++++++++++++
>  3 files changed, 14 insertions(+), 17 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

> +static __init int tboot_force_iommu(void)
> +{
> +	if (!tboot_enabled())
> +		return 0;
> +
> +	if (no_iommu || dmar_disabled)
> +		pr_warn("Forcing Intel-IOMMU to enabled\n");

Unrelated, but when we are in the special secure IOMMU modes, do we
force ATS off? Specifically does the IOMMU reject TLPs that are marked
as translated?

Jason