The patch titled
Subject: mm/x86/pat: use the new follow_pfnmap API
has been added to the -mm mm-unstable branch. Its filename is
mm-x86-pat-use-the-new-follow_pfnmap-api.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-x86-pat-use-the-new-follow_pfnmap-api.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/x86/pat: use the new follow_pfnmap API
Date: Mon, 26 Aug 2024 16:43:46 -0400
Use the new API that can understand huge pfn mappings.
Link: https://lkml.kernel.org/r/20240826204353.2228736-13-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Gavin Shan <gshan@xxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/pat/memtype.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
--- a/arch/x86/mm/pat/memtype.c~mm-x86-pat-use-the-new-follow_pfnmap-api
+++ a/arch/x86/mm/pat/memtype.c
@@ -951,23 +951,20 @@ static void free_pfn_range(u64 paddr, un
static int follow_phys(struct vm_area_struct *vma, unsigned long *prot,
resource_size_t *phys)
{
- pte_t *ptep, pte;
- spinlock_t *ptl;
+ struct follow_pfnmap_args args = { .vma = vma, .address = vma->vm_start };
- if (follow_pte(vma, vma->vm_start, &ptep, &ptl))
+ if (follow_pfnmap_start(&args))
return -EINVAL;
- pte = ptep_get(ptep);
-
/* Never return PFNs of anon folios in COW mappings. */
- if (vm_normal_folio(vma, vma->vm_start, pte)) {
- pte_unmap_unlock(ptep, ptl);
+ if (!args.special) {
+ follow_pfnmap_end(&args);
return -EINVAL;
}
- *prot = pgprot_val(pte_pgprot(pte));
- *phys = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
- pte_unmap_unlock(ptep, ptl);
+ *prot = pgprot_val(args.pgprot);
+ *phys = (resource_size_t)args.pfn << PAGE_SHIFT;
+ follow_pfnmap_end(&args);
return 0;
}
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-dax-dump-start-address-in-fault-handler.patch
mm-mprotect-push-mmu-notifier-to-puds.patch
mm-powerpc-add-missing-pud-helpers.patch
mm-x86-make-pud_leaf-only-care-about-pse-bit.patch
mm-x86-implement-arch_check_zapped_pud.patch
mm-x86-add-missing-pud-helpers.patch
mm-mprotect-fix-dax-pud-handlings.patch
mm-introduce-arch_supports_huge_pfnmap-and-special-bits-to-pmd-pud.patch
mm-drop-is_huge_zero_pud.patch
mm-mark-special-bits-for-huge-pfn-mappings-when-inject.patch
mm-allow-thp-orders-for-pfnmaps.patch
mm-gup-detect-huge-pfnmap-entries-in-gup-fast.patch
mm-pagewalk-check-pfnmap-for-folio_walk_start.patch
mm-fork-accept-huge-pfnmap-entries.patch
mm-always-define-pxx_pgprot.patch
mm-new-follow_pfnmap-api.patch
kvm-use-follow_pfnmap-api.patch
s390-pci_mmio-use-follow_pfnmap-api.patch
mm-x86-pat-use-the-new-follow_pfnmap-api.patch
vfio-use-the-new-follow_pfnmap-api.patch
acrn-use-the-new-follow_pfnmap-api.patch
mm-access_process_vm-use-the-new-follow_pfnmap-api.patch
mm-remove-follow_pte.patch
mm-x86-support-large-pfn-mappings.patch
mm-arm64-support-large-pfn-mappings.patch
