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>
Cc: Nikos Nikoleris <nikos.nikoleris@arm.com>,
Linu Cherian <linu.cherian@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
David Hildenbrand <david@kernel.org>,
Andrew Morton <akpm@linux-foundation.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 09/18] arm64: Prevent HVO if the HVO system feature is not enabled
Date: Wed, 8 Jul 2026 03:11:19 +0000 [thread overview]
Message-ID: <20260708031129.3503195-10-jthoughton@google.com> (raw)
In-Reply-To: <20260708031129.3503195-1-jthoughton@google.com>
The HVO system feature checks that all CPUs support HW AF and
BBML2_NOABORT, both of which are needed for HVO (as of this patch).
Signed-off-by: James Houghton <jthoughton@google.com>
---
arch/arm64/include/asm/hugetlb.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index d038ff14d16c..73af7911fd83 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -11,6 +11,7 @@
#define __ASM_HUGETLB_H
#include <asm/cacheflush.h>
+#include <asm/cpufeature.h>
#include <asm/mte.h>
#include <asm/page.h>
@@ -65,6 +66,12 @@ extern void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t old_pte, pte_t new_pte);
+#define __HAVE_ARCH_HVO_SUPPORTED
+static inline bool arch_hugetlb_vmemmap_optimization_supported(void)
+{
+ return system_supports_hvo();
+}
+
#include <asm-generic/hugetlb.h>
static inline void __flush_hugetlb_tlb_range(struct vm_area_struct *vma,
--
2.55.0.795.g602f6c329a-goog
next prev parent reply other threads:[~2026-07-08 3:12 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-08 3:11 [PATCH 00/18] Another attempt at HVO support on arm64 James Houghton
2026-07-08 3:11 ` [PATCH 01/18] hugetlb_vmemmap: Always flush TLB if needed upon PTE remapping James Houghton
2026-07-08 3:11 ` [PATCH 02/18] hugetlb_vmemmap: Move vmemmap_get_tail up James Houghton
2026-07-08 3:11 ` [PATCH 03/18] hugetlb_vmemmap: Leave pages partially HVOed upon restore failure James Houghton
2026-07-08 3:11 ` [PATCH 04/18] hugetlb_vmemmap: Use try_update_vmemmap_pte to update in-use PTEs James Houghton
2026-07-08 3:11 ` [PATCH 05/18] hugetlb_vmemmap: Allow architectures not to allow HVO at runtime James Houghton
2026-07-08 3:11 ` [PATCH 06/18] arm64: Rename cpu_has_hw_af to system_has_hw_af James Houghton
2026-07-08 3:11 ` [PATCH 07/18] arm64: Add system_supports_hvo James Houghton
2026-07-08 3:11 ` [PATCH 08/18] arm64: Implement try_update_vmemmap_pte using the AF trick James Houghton
2026-07-08 3:11 ` James Houghton [this message]
2026-07-08 3:11 ` [PATCH 10/18] arm64: Support hugetlb vmemmap optimization James Houghton
2026-07-08 3:11 ` [PATCH 11/18] hugetlb_vmemmap: Use try_populate_vmemmap_pmd for replacing in-use PMDs James Houghton
2026-07-08 3:11 ` [PATCH 12/18] arm64: Implement try_populate_vmemmap_pmd using AF trick James Houghton
2026-07-08 3:11 ` [PATCH 13/18] arm64: Drop BBML2_NOABORT requirement for HVO James Houghton
2026-07-08 3:11 ` [PATCH 14/18] hugetlb_vmemmap: Rename mm/hugetlb_vmemmap.h to mm/hugetlb_vmemmap_internal.h James Houghton
2026-07-08 3:11 ` [PATCH 15/18] hugetlb_vmemmap: Add a way to permanently disable HVO when needed James Houghton
2026-07-08 3:11 ` [PATCH 16/18] arm64: Allow "optional" CPU features to be required sometimes James Houghton
2026-07-08 3:11 ` [PATCH 17/18] arm64: Permit onlining of HVO-incompatible late CPUs if HVO is not in use James Houghton
2026-07-08 3:11 ` [PATCH 18/18] arm64: Remove user-selectable HVO Kconfig James Houghton
2026-07-08 8:40 ` [PATCH 00/18] Another attempt at HVO support on arm64 Muchun Song
2026-07-08 16:49 ` James Houghton
2026-07-09 9:54 ` Muchun Song
2026-07-09 19:04 ` James Houghton
2026-07-10 3:40 ` Muchun Song
2026-07-11 2:22 ` Muchun Song
2026-07-09 9:58 ` David Hildenbrand (Arm)
2026-07-10 4:58 ` Muchun Song
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