linux-kernel - [RFC PATCH v2 07/47] hugetlb: add CONFIG_HUGETLB_HIGH_GRANULARITY

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 21 Oct 2022 16:36:23 +0000
From:   James Houghton <jthoughton@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        "Zach O'Keefe" <zokeefe@...gle.com>,
        Manish Mishra <manish.mishra@...anix.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Yang Shi <shy828301@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        James Houghton <jthoughton@...gle.com>
Subject: [RFC PATCH v2 07/47] hugetlb: add CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING

This adds the Kconfig to enable or disable high-granularity mapping.
Each architecture must explicitly opt-in to it (via
ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING), but when opted in, HGM will
be enabled by default if HUGETLB_PAGE is enabled.

Signed-off-by: James Houghton <jthoughton@...gle.com>
---
 fs/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/Kconfig b/fs/Kconfig
index 2685a4d0d353..ce2567946016 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -267,6 +267,13 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
 	  enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
 	  (boot command line) or hugetlb_optimize_vmemmap (sysctl).
 
+config ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING
+	bool
+
+config HUGETLB_HIGH_GRANULARITY_MAPPING
+	def_bool HUGETLB_PAGE
+	depends on ARCH_WANT_HUGETLB_HIGH_GRANULARITY_MAPPING
+
 config MEMFD_CREATE
 	def_bool TMPFS || HUGETLBFS
 
-- 
2.38.0.135.g90850a2211-goog