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| author | Peter Xu <peterx@redhat.com> | 2024-08-26 16:43:52 -0400 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-17 01:07:00 -0700 |
| commit | 3e509c9b03f9abc7804c80bed266a6cc4286a5a8 (patch) | |
| tree | 6abf9d80859262888c16d541322873d51bf267c2 /arch/arm64/Kconfig | |
| parent | 75182022a0439788415b2dd1db3086e07aa506f7 (diff) | |
| download | linux-3e509c9b03f9abc7804c80bed266a6cc4286a5a8.tar.gz linux-3e509c9b03f9abc7804c80bed266a6cc4286a5a8.tar.bz2 linux-3e509c9b03f9abc7804c80bed266a6cc4286a5a8.zip | |
mm/arm64: support large pfn mappings
Support huge pfnmaps by using bit 56 (PTE_SPECIAL) for "special" on
pmds/puds. Provide the pmd/pud helpers to set/get special bit.
There's one more thing missing for arm64 which is the pxx_pgprot() for
pmd/pud. Add them too, which is mostly the same as the pte version by
dropping the pfn field. These helpers are essential to be used in the new
follow_pfnmap*() API to report valid pgprot_t results.
Note that arm64 doesn't yet support huge PUD yet, but it's still
straightforward to provide the pud helpers that we need altogether. Only
PMD helpers will make an immediate benefit until arm64 will support huge
PUDs first in general (e.g. in THPs).
Link: https://lkml.kernel.org/r/20240826204353.2228736-19-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
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: 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: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6494848019a0..6607ed8fdbb4 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -99,6 +99,7 @@ config ARM64 select ARCH_SUPPORTS_NUMA_BALANCING select ARCH_SUPPORTS_PAGE_TABLE_CHECK select ARCH_SUPPORTS_PER_VMA_LOCK + select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH select ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT select ARCH_WANT_DEFAULT_BPF_JIT |