linux-kernel - Re: [PATCH v4 04/12] iommu/vt-d: Add helper to setup pasid nested translation

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Date:   Wed, 2 Aug 2023 16:09:32 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>
Cc:     baolu.lu@...ux.intel.com, "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v4 04/12] iommu/vt-d: Add helper to setup pasid nested
 translation

On 2023/8/2 15:10, Tian, Kevin wrote:
>> +
>> +	pasid_set_slptr(pte, virt_to_phys(pgd));
>> +	pasid_set_fault_enable(pte);
>> +	pasid_set_domain_id(pte, did);
>> +	pasid_set_address_width(pte, s2_domain->agaw);
>> +	pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
>> +	pasid_set_translation_type(pte, PASID_ENTRY_PGTT_NESTED);
>> +	pasid_set_present(pte);
>> +	spin_unlock(&iommu->lock);
>> +
> this lacks of handling of force_snooping

If stage-2 domain has force_snooping attribute set, then we should set
the bit field in the pasid entry, right?

How about below additional change?

diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c
index 19ac4084913b..86db81ec91f1 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -827,6 +827,9 @@ int intel_pasid_setup_nested(struct intel_iommu 
*iommu, struct device *dev,
         if (s1_cfg->flags & IOMMU_VTD_S1_EAFE)
                 pasid_set_eafe(pte);

+       if (s2_domain>force_snooping)
+               pasid_set_pgsnp(pte);
+
         pasid_set_slptr(pte, virt_to_phys(pgd));
         pasid_set_fault_enable(pte);
         pasid_set_domain_id(pte, did);

Best regards,
baolu