From: James Houghton <jthoughton@google.com>
To: Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Nikos Nikoleris <nikos.nikoleris@arm.com>,
Linu Cherian <linu.cherian@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
David Hildenbrand <david@kernel.org>,
Ryan Roberts <ryan.roberts@arm.com>,
Nanyong Sun <sunnanyong@huawei.com>, Yu Zhao <yuzhao@google.com>,
Frank van der Linden <fvdl@google.com>,
David Rientjes <rientjes@google.com>,
James Houghton <jthoughton@google.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org
Subject: [PATCH v2 18/20 DO-NOT-MERGE] arm64: Drop BBML3 requirement for HVO
Date: Sat, 3 Oct 2026 00:21:21 +0000 [thread overview]
Message-ID: <20261003002123.505555-19-jthoughton@google.com> (raw)
In-Reply-To: <20261003002123.505555-1-jthoughton@google.com>
With PMD updates being done with the Access Flag trick, BBML3 is no
longer needed.
Dropping this requirement vastly widens the pool of systems this
optimization is valid for.
Signed-off-by: James Houghton <jthoughton@google.com>
---
arch/arm64/kernel/cpufeature.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 448d4ef085de..f3fd6d0b0e41 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -2206,11 +2206,10 @@ static bool has_bbm_through_af(const struct arm64_cpu_capabilities *caps, int sc
}
/*
- * We need BBML3 to support Block -> Table transitions without taking
- * faults, and we need HW AF support to support changing the OA without
- * taking faults.
+ * We need HW AF support to support changing the vmemmap mapping level
+ * and OA without taking faults.
*/
- return cpu_supports_bbml3() && cpu_has_hw_af();
+ return cpu_has_hw_af();
}
static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused)
--
2.56.0.rc1.315.gc6ed9934b7-goog
next prev parent reply other threads:[~2026-10-03 0:22 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-03 0:21 [PATCH v2 00/20] Another attempt at HVO support on arm64 James Houghton
2026-10-03 0:21 ` [PATCH v2 01/20] hugetlb: Don't restore vmemmap of non-HVOed folios on bulk restore error James Houghton
2026-10-03 0:21 ` [PATCH v2 02/20] arm64/pgtable: Clear AF with LDCLR on supported systems James Houghton
2026-10-03 0:21 ` [PATCH v2 03/20] hugetlb_vmemmap: Always flush TLB if needed upon PTE remapping James Houghton
2026-10-03 0:21 ` [PATCH v2 04/20] hugetlb_vmemmap: Leave pages partially HVOed upon restore failure James Houghton
2026-10-03 0:21 ` [PATCH v2 05/20] hugetlb_vmemmap: Use try_update_vmemmap_pte to update in-use PTEs James Houghton
2026-10-03 0:21 ` [PATCH v2 06/20] hugetlb_vmemmap: Allow architectures to dynamically disallow HVO James Houghton
2026-10-03 0:21 ` [PATCH v2 07/20] hugetlb_vmemmap: Disable HVO sysctl if arch doesn't support HVO James Houghton
2026-10-03 0:21 ` [PATCH v2 08/20] hugetlb: Fully initialize tail struct pages of non-pre-HVOed bootmem folios James Houghton
2026-10-03 0:21 ` [PATCH v2 09/20] hugetlb_vmemmap: Allow architectures to make HVO enablement boot-time only James Houghton
2026-10-03 0:21 ` [PATCH v2 10/20] hugetlb_vmemmap: Expose whether HVO is enabled to architecture code James Houghton
2026-10-03 0:21 ` [PATCH v2 11/20] arm64: Add bbm_through_af capability James Houghton
2026-10-03 0:21 ` [PATCH v2 12/20] arm64: Implement try_update_vmemmap_pte using the AF trick James Houghton
2026-10-03 0:21 ` [PATCH v2 13/20] arm64: Support hugetlb vmemmap optimization James Houghton
2026-10-03 0:21 ` [PATCH v2 14/20] hugetlb_vmemmap: Add fault injection for in-place vmemmap PTE updates James Houghton
2026-10-03 0:21 ` [PATCH v2 15/20] selftests/mm: Add HugeTLB vmemmap optimization stress test James Houghton
2026-10-03 0:21 ` [PATCH v2 16/20 DO-NOT-MERGE] hugetlb_vmemmap: Use try_populate_vmemmap_pmd for replacing in-use PMDs James Houghton
2026-10-03 0:21 ` [PATCH v2 17/20 DO-NOT-MERGE] arm64: Implement try_populate_vmemmap_pmd using AF trick James Houghton
2026-10-03 0:21 ` James Houghton [this message]
2026-10-03 0:21 ` [PATCH v2 19/20 DO-NOT-MERGE] hugetlb_vmemmap: Add fault injection for in-place vmemmap PMD splits James Houghton
2026-10-03 0:21 ` [PATCH v2 20/20 DO-NOT-MERGE] selftests/mm: Add HVO pmd-split fault injection tests James Houghton
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