linux-kernel - [RFC PATCH 19/42] iommu/vt-d: Set bit PGSNP in PASIDTE if domain cache coherency is enforced

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Message-Id: <20231202092452.14581-1-yan.y.zhao@intel.com>
Date:   Sat,  2 Dec 2023 17:24:52 +0800
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     iommu@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     alex.williamson@...hat.com, jgg@...dia.com, pbonzini@...hat.com,
        seanjc@...gle.com, joro@...tes.org, will@...nel.org,
        robin.murphy@....com, kevin.tian@...el.com,
        baolu.lu@...ux.intel.com, dwmw2@...radead.org, yi.l.liu@...el.com,
        Yan Zhao <yan.y.zhao@...el.com>
Subject: [RFC PATCH 19/42] iommu/vt-d: Set bit PGSNP in PASIDTE if domain cache coherency is enforced

Set bit PGSNP (Page Snoop, bit 88) in PASIDTE when attaching device to a
domain whose cache coherency is enforced.

Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
---
 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 74e8e4c17e814..a42955b5e666f 100644
--- a/drivers/iommu/intel/pasid.c
+++ b/drivers/iommu/intel/pasid.c
@@ -679,10 +679,11 @@ int intel_pasid_setup_second_level(struct intel_iommu *iommu,
 	pasid_set_address_width(pte, agaw);
 	pasid_set_translation_type(pte, PASID_ENTRY_PGTT_SL_ONLY);
 	pasid_set_fault_enable(pte);
+	if (domain->force_snooping)
+		pasid_set_pgsnp(pte);
 	pasid_set_page_snoop(pte, !!ecap_smpwc(iommu->ecap));
 	if (domain->dirty_tracking)
 		pasid_set_ssade(pte);
-
 	pasid_set_present(pte);
 	spin_unlock(&iommu->lock);
 
-- 
2.17.1