linux-kernel - [PATCH 13/19] vfio: Use the new follow

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Message-ID: <20240809160909.1023470-14-peterx@redhat.com>
Date: Fri,  9 Aug 2024 12:09:03 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Sean Christopherson <seanjc@...gle.com>,
	Oscar Salvador <osalvador@...e.de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org,
	peterx@...hat.com,
	Will Deacon <will@...nel.org>,
	Gavin Shan <gshan@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Zi Yan <ziy@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Alistair Popple <apopple@...dia.com>,
	Borislav Petkov <bp@...en8.de>,
	David Hildenbrand <david@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	kvm@...r.kernel.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Yan Zhao <yan.y.zhao@...el.com>
Subject: [PATCH 13/19] vfio: Use the new follow_pfnmap API

Use the new API that can understand huge pfn mappings.

Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 drivers/vfio/vfio_iommu_type1.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 0960699e7554..bf391b40e576 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -513,12 +513,10 @@ static int follow_fault_pfn(struct vm_area_struct *vma, struct mm_struct *mm,
 			    unsigned long vaddr, unsigned long *pfn,
 			    bool write_fault)
 {
-	pte_t *ptep;
-	pte_t pte;
-	spinlock_t *ptl;
+	struct follow_pfnmap_args args = { .vma = vma, .address = vaddr };
 	int ret;
 
-	ret = follow_pte(vma, vaddr, &ptep, &ptl);
+	ret = follow_pfnmap_start(&args);
 	if (ret) {
 		bool unlocked = false;
 
@@ -532,19 +530,17 @@ static int follow_fault_pfn(struct vm_area_struct *vma, struct mm_struct *mm,
 		if (ret)
 			return ret;
 
-		ret = follow_pte(vma, vaddr, &ptep, &ptl);
+		ret = follow_pfnmap_start(&args);
 		if (ret)
 			return ret;
 	}
 
-	pte = ptep_get(ptep);
-
-	if (write_fault && !pte_write(pte))
+	if (write_fault && !args.writable)
 		ret = -EFAULT;
 	else
-		*pfn = pte_pfn(pte);
+		*pfn = args.pfn;
 
-	pte_unmap_unlock(ptep, ptl);
+	follow_pfnmap_end(&args);
 	return ret;
 }
 
-- 
2.45.0