linux-kernel - Re: [PATCH] iommu/vt-d: remove global page flush support

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Date:   Fri, 23 Aug 2019 10:23:07 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH] iommu/vt-d: remove global page flush support

Hi Jacob,

On Tue, Aug 20, 2019 at 02:21:08PM -0700, Jacob Pan wrote:
> Global pages support is removed from VT-d spec 3.0. Since global pages G
> flag only affects first-level paging structures and because DMA request
> with PASID are only supported by VT-d spec. 3.0 and onward, we can
> safely remove global pages support.
> 
> For kernel shared virtual address IOTLB invalidation, PASID
> granularity and page selective within PASID will be used. There is
> no global granularity supported. Without this fix, IOTLB invalidation
> will cause invalid descriptor error in the queued invalidation (QI)
> interface.
> 
> Reported-by:   Sanjay K Kumar <sanjay.k.kumar@...el.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  drivers/iommu/intel-svm.c   | 36 +++++++++++++++---------------------
>  include/linux/intel-iommu.h |  3 ---
>  2 files changed, 15 insertions(+), 24 deletions(-)

Does not cleanly apply to v5.3-rc5, can you please rebase it and
re-send? Also, is this v5.3 stuff (in that case please add a Fixes tag)
or can it wait for v5.4?

Regards,

	Joerg