linux-kernel - [RFC PATCH 06/12] iommu: Add mmu

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Date:   Tue, 17 Oct 2023 11:20:39 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...pe.ca>,
        Kevin Tian <kevin.tian@...el.com>,
        Tina Zhang <tina.zhang@...el.com>
Subject: [RFC PATCH 06/12] iommu: Add mmu_notifier to sva domain

Devices attached to shared virtual addressing (SVA) domain are allowed to
use the same virtual addresses with processor, and this functionality is
called shared virtual memory. When shared virtual memory is being used,
it's the sva domain's responsibility to keep device TLB cache and the CPU
cache in sync. Hence add mmu_notifier to sva domain.

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 include/linux/iommu.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 19b5ae2303ff..afb566230427 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -7,6 +7,7 @@
 #ifndef __LINUX_IOMMU_H
 #define __LINUX_IOMMU_H
 
+#include <linux/mmu_notifier.h>
 #include <linux/scatterlist.h>
 #include <linux/device.h>
 #include <linux/types.h>
@@ -114,6 +115,7 @@ struct iommu_domain {
 			 * protected by iommu_sva_lock.
 			 */
 			struct list_head next;
+			struct mmu_notifier notifier;
 		};
 	};
 };
-- 
2.39.3