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Tue, 07 Jul 2026 20:11:41 -0700 (PDT) Date: Wed, 8 Jul 2026 03:11:19 +0000 In-Reply-To: <20260708031129.3503195-1-jthoughton@google.com> Mime-Version: 1.0 References: <20260708031129.3503195-1-jthoughton@google.com> X-Mailer: git-send-email 2.55.0.795.g602f6c329a-goog Message-ID: <20260708031129.3503195-10-jthoughton@google.com> Subject: [PATCH 09/18] arm64: Prevent HVO if the HVO system feature is not enabled From: James Houghton To: Will Deacon , Catalin Marinas , Muchun Song , Oscar Salvador Cc: Nikos Nikoleris , Linu Cherian , Mark Rutland , David Hildenbrand , Andrew Morton , Ryan Roberts , Nanyong Sun , Yu Zhao , Frank van der Linden , David Rientjes , James Houghton , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260707_201142_728049_7B0E8B70 X-CRM114-Status: GOOD ( 11.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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 +#include #include #include @@ -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 static inline void __flush_hugetlb_tlb_range(struct vm_area_struct *vma, -- 2.55.0.795.g602f6c329a-goog