linux-kernel - [PATCH v5 2/3] vfio/type1: introduce a new member has_rsvd for struct vfio

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Message-ID: <20250620032344.13382-3-lizhe.67@bytedance.com>
Date: Fri, 20 Jun 2025 11:23:43 +0800
From: lizhe.67@...edance.com
To: alex.williamson@...hat.com,
	jgg@...pe.ca,
	david@...hat.com
Cc: peterx@...hat.com,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lizhe.67@...edance.com
Subject: [PATCH v5 2/3] vfio/type1: introduce a new member has_rsvd for struct vfio_dma

From: Li Zhe <lizhe.67@...edance.com>

Introduce a new member has_rsvd for struct vfio_dma. This member is
used to indicate whether there are any reserved or invalid pfns in
the region represented by this vfio_dma. If it is true, it indicates
that there is at least one pfn in this region that is either reserved
or invalid.

Signed-off-by: Li Zhe <lizhe.67@...edance.com>
---
 drivers/vfio/vfio_iommu_type1.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index e952bf8bdfab..8827e315e3d8 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -93,6 +93,10 @@ struct vfio_dma {
 	bool			iommu_mapped;
 	bool			lock_cap;	/* capable(CAP_IPC_LOCK) */
 	bool			vaddr_invalid;
+	/*
+	 * Any reserved or invalid pfns within this range?
+	 */
+	bool			has_rsvd;
 	struct task_struct	*task;
 	struct rb_root		pfn_list;	/* Ex-user pinned pfn list */
 	unsigned long		*bitmap;
@@ -785,6 +789,7 @@ static long vfio_pin_pages_remote(struct vfio_dma *dma, unsigned long vaddr,
 	}
 
 out:
+	dma->has_rsvd |= rsvd;
 	ret = vfio_lock_acct(dma, lock_acct, false);
 
 unpin_out:
-- 
2.20.1