patches/old/acrn-use-the-new-follow_pfnmap-api.patch

From: Peter Xu <peterx@redhat.com>
Subject: acrn: use the new follow_pfnmap API
Date: Mon, 26 Aug 2024 16:43:48 -0400

Use the new API that can understand huge pfn mappings.

Link: https://lkml.kernel.org/r/20240826204353.2228736-15-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Gavin Shan <gshan@redhat.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/virt/acrn/mm.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/drivers/virt/acrn/mm.c~acrn-use-the-new-follow_pfnmap-api
+++ a/drivers/virt/acrn/mm.c
@@ -177,9 +177,7 @@ int acrn_vm_ram_map(struct acrn_vm *vm,
 	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,
 		}
 
 		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 &&
_