linux-kernel - Re: [PATCH] iommu/vt-d: Fix PASID cache flush

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Message-ID: <20200331090843.59961e03@jacob-builder>
Date:   Tue, 31 Mar 2020 09:08:43 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Auger Eric <eric.auger@...hat.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Raj Ashok <ashok.raj@...el.com>, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH] iommu/vt-d: Fix PASID cache flush

Actually, this is not a bug. The current code has:
#define QI_PC_PASID_SEL             (QI_PC_TYPE | QI_PC_GRAN(1))

Which already has the type and shift.

In my vSVA series, I redefined granu such that I can use them in the 2D
table lookup.

-#define QI_PC_ALL_PASIDS       (QI_PC_TYPE | QI_PC_GRAN(0))        
-#define QI_PC_PASID_SEL                (QI_PC_TYPE | QI_PC_GRAN(1))
+/* PASID cache invalidation granu */                               
+#define QI_PC_ALL_PASIDS       0                                   
+#define QI_PC_PASID_SEL                1                           

Please ignore this, sorry about the confusion.

On Tue, 31 Mar 2020 11:28:17 +0200
Auger Eric <eric.auger@...hat.com> wrote:

> Hi Jacob,
> 
> On 3/31/20 1:25 AM, Jacob Pan wrote:
> > PASID cache type and shift of granularity bits are missing in
> > the current code.
> > 
> > Fixes: 6f7db75e1c46 ("iommu/vt-d: Add second level page table
> > interface")
> > 
> > Cc: Eric Auger <eric.auger@...hat.com>
> > Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>  
> Reviewed-by: Eric Auger <eric.auger@...hat.com>
> 
> Thanks
> 
> Eric
> 
> > ---
> >  drivers/iommu/intel-pasid.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/iommu/intel-pasid.c
> > b/drivers/iommu/intel-pasid.c index 22b30f10b396..57d05b0fbafc
> > 100644 --- a/drivers/iommu/intel-pasid.c
> > +++ b/drivers/iommu/intel-pasid.c
> > @@ -365,7 +365,8 @@ pasid_cache_invalidation_with_pasid(struct
> > intel_iommu *iommu, {
> >  	struct qi_desc desc;
> >  
> > -	desc.qw0 = QI_PC_DID(did) | QI_PC_PASID_SEL |
> > QI_PC_PASID(pasid);
> > +	desc.qw0 = QI_PC_DID(did) | QI_PC_GRAN(QI_PC_PASID_SEL) |
> > +		   QI_PC_PASID(pasid) | QI_PC_TYPE;
> >  	desc.qw1 = 0;
> >  	desc.qw2 = 0;
> >  	desc.qw3 = 0;
> >   
> 

[Jacob Pan]