linux-kernel - [PATCH v2 14/19] acrn: Use the new follow

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Message-ID: <20240826204353.2228736-15-peterx@redhat.com>
Date: Mon, 26 Aug 2024 16:43:48 -0400
From: Peter Xu <peterx@...hat.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: Gavin Shan <gshan@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>,
	x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alistair Popple <apopple@...dia.com>,
	kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Sean Christopherson <seanjc@...gle.com>,
	peterx@...hat.com,
	Oscar Salvador <osalvador@...e.de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Borislav Petkov <bp@...en8.de>,
	Zi Yan <ziy@...dia.com>,
	Axel Rasmussen <axelrasmussen@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	Yan Zhao <yan.y.zhao@...el.com>,
	Will Deacon <will@...nel.org>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Alex Williamson <alex.williamson@...hat.com>
Subject: [PATCH v2 14/19] acrn: Use the new follow_pfnmap API

Use the new API that can understand huge pfn mappings.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 drivers/virt/acrn/mm.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/virt/acrn/mm.c b/drivers/virt/acrn/mm.c
index db8ff1d0ac23..4c2f28715b70 100644
--- a/drivers/virt/acrn/mm.c
+++ b/drivers/virt/acrn/mm.c
@@ -177,9 +177,7 @@ int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 	vma = vma_lookup(current->mm, memmap->vma_base);
 	if (vma && ((vma->vm_flags & VM_PFNMAP) != 0)) {
 		unsigned long start_pfn, cur_pfn;
-		spinlock_t *ptl;
 		bool writable;
-		pte_t *ptep;
 
 		if ((memmap->vma_base + memmap->len) > vma->vm_end) {
 			mmap_read_unlock(current->mm);
@@ -187,16 +185,20 @@ int acrn_vm_ram_map(struct acrn_vm *vm, struct acrn_vm_memmap *memmap)
 		}
 
 		for (i = 0; i < nr_pages; i++) {
-			ret = follow_pte(vma, memmap->vma_base + i * PAGE_SIZE,
-					 &ptep, &ptl);
+			struct follow_pfnmap_args args = {
+				.vma = vma,
+				.address = memmap->vma_base + i * PAGE_SIZE,
+			};
+
+			ret = follow_pfnmap_start(&args);
 			if (ret)
 				break;
 
-			cur_pfn = pte_pfn(ptep_get(ptep));
+			cur_pfn = args.pfn;
 			if (i == 0)
 				start_pfn = cur_pfn;
-			writable = !!pte_write(ptep_get(ptep));
-			pte_unmap_unlock(ptep, ptl);
+			writable = args.writable;
+			follow_pfnmap_end(&args);
 
 			/* Disallow write access if the PTE is not writable. */
 			if (!writable &&
-- 
2.45.0