From: mpenttil@redhat.com
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org,
"Mika Penttilä" <mpenttil@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"David Hildenbrand" <david@kernel.org>,
"Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Mike Rapoport" <rppt@kernel.org>,
"Suren Baghdasaryan" <surenb@google.com>,
"Michal Hocko" <mhocko@suse.com>
Subject: [PATCH v5 1/6] mm:/Kconfig changes for migrate on fault for device pages
Date: Wed, 11 Feb 2026 10:12:56 +0200 [thread overview]
Message-ID: <20260211081301.2940672-2-mpenttil@redhat.com> (raw)
In-Reply-To: <20260211081301.2940672-1-mpenttil@redhat.com>
From: Mika Penttilä <mpenttil@redhat.com>
With the unified HMM/migrate_device page table walk
migrate_device needs HMM enabled and HMM needs
MMU notifiers. Enable them explicitly to avoid
breaking random configs.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Mika Penttilä <mpenttil@redhat.com>
---
mm/Kconfig | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/Kconfig b/mm/Kconfig
index a992f2203eb9..1b8778f34922 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -661,6 +661,7 @@ config MIGRATION
config DEVICE_MIGRATION
def_bool MIGRATION && ZONE_DEVICE
+ select HMM_MIRROR
config ARCH_ENABLE_HUGEPAGE_MIGRATION
bool
@@ -1236,6 +1237,7 @@ config ZONE_DEVICE
config HMM_MIRROR
bool
depends on MMU
+ select MMU_NOTIFIER
config GET_FREE_REGION
bool
--
2.50.0
next prev parent reply other threads:[~2026-02-11 8:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-11 8:12 [PATCH v5 0/6] Migrate " mpenttil
2026-02-11 8:12 ` mpenttil [this message]
2026-02-11 8:12 ` [PATCH v5 2/6] mm: Add helper to convert HMM pfn to migrate pfn mpenttil
2026-02-11 8:12 ` [PATCH v5 3/6] mm/hmm: do the plumbing for HMM to participate in migration mpenttil
2026-02-11 8:12 ` [PATCH 4/6] mm: setup device page migration in HMM pagewalk mpenttil
2026-02-11 8:13 ` [PATCH v5 5/6] mm: add new testcase for the migrate on fault case mpenttil
2026-02-11 8:13 ` [PATCH v5 6/6] mm:/migrate_device.c: remove migrate_vma_collect_*() mpenttil
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