From: Vincent Donnefort <vdonnefort@google.com>
To: Rob Herring <robh@kernel.org>
Cc: catalin.marinas@arm.com, will@kernel.org, rppt@kernel.org,
akpm@linux-foundation.org, sudeep.holla@kernel.org,
jenswi@kernel.org, mark.rutland@arm.com, sumit.garg@kernel.org,
ardb@kernel.org, thierry.reding@kernel.org, david@kernel.org,
danielmentz@google.com, linux-arm-kernel@lists.infradead.org,
linux-mm@kvack.org, op-tee@lists.trustedfirmware.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 02/10] of: reserved_mem: Introduce "ll-map" property
Date: Thu, 3 Sep 2026 11:03:12 +0100 [thread overview]
Message-ID: <aplF4NaoFk73d-c5@google.com> (raw)
In-Reply-To: <20260902172436.GB1440252-robh@kernel.org>
On Wed, Sep 02, 2026 at 12:24:36PM -0500, Rob Herring wrote:
> On Wed, Sep 02, 2026 at 11:47:04AM +0100, Vincent Donnefort wrote:
> > Keeping last-level mappings is interesting on some architectures as it
> > allows mapping/unmapping pages from the kernel direct map without the
> > risk of splitting blocks which, under the break-before-make rule, may
> > trigger page-faults the kernel can't handle.
> >
> > Add an "ll-map" property for reserved-memory regions. When set, it
> > splits the underlying memblock and sets the MEMBLOCK_LLMAP flag.
>
> Where is this documented? Any DT property must have a schema.
Ack.
>
> Though I'm not thrilled about more flag properties. Handling all the
> combinations of properties has proven to be painful. Can this be implied
> from the compatible string instead?
>
> Rob
We need this before the kernel direct map has been created (paging_init()).
I would have moved that directly into the driver lend_pool.c, but then it is
probed too late (unflatten_device_tree()).
--
Vincent
WARNING: multiple messages have this Message-ID (diff)
From: Vincent Donnefort via OP-TEE <op-tee@lists.trustedfirmware.org>
To: Rob Herring <robh@kernel.org>
Cc: catalin.marinas@arm.com, will@kernel.org, rppt@kernel.org,
akpm@linux-foundation.org, sudeep.holla@kernel.org,
jenswi@kernel.org, mark.rutland@arm.com, sumit.garg@kernel.org,
ardb@kernel.org, thierry.reding@kernel.org, david@kernel.org,
danielmentz@google.com, linux-arm-kernel@lists.infradead.org,
linux-mm@kvack.org, op-tee@lists.trustedfirmware.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 02/10] of: reserved_mem: Introduce "ll-map" property
Date: Thu, 3 Sep 2026 11:03:12 +0100 [thread overview]
Message-ID: <aplF4NaoFk73d-c5@google.com> (raw)
In-Reply-To: <20260902172436.GB1440252-robh@kernel.org>
On Wed, Sep 02, 2026 at 12:24:36PM -0500, Rob Herring wrote:
> On Wed, Sep 02, 2026 at 11:47:04AM +0100, Vincent Donnefort wrote:
> > Keeping last-level mappings is interesting on some architectures as it
> > allows mapping/unmapping pages from the kernel direct map without the
> > risk of splitting blocks which, under the break-before-make rule, may
> > trigger page-faults the kernel can't handle.
> >
> > Add an "ll-map" property for reserved-memory regions. When set, it
> > splits the underlying memblock and sets the MEMBLOCK_LLMAP flag.
>
> Where is this documented? Any DT property must have a schema.
Ack.
>
> Though I'm not thrilled about more flag properties. Handling all the
> combinations of properties has proven to be painful. Can this be implied
> from the compatible string instead?
>
> Rob
We need this before the kernel direct map has been created (paging_init()).
I would have moved that directly into the driver lend_pool.c, but then it is
probed too late (unflatten_device_tree()).
--
Vincent
next prev parent reply other threads:[~2026-09-03 10:03 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 10:47 [PATCH v9 00/10] arm64: Unmap FF-A lent memory from direct map Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 10:47 ` [PATCH v9 01/10] memblock: Introduce MEMBLOCK_LLMAP Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-06 19:33 ` Mike Rapoport via OP-TEE
2026-09-06 19:33 ` Mike Rapoport
2026-09-07 9:50 ` Vincent Donnefort via OP-TEE
2026-09-07 9:50 ` Vincent Donnefort
2026-09-08 7:40 ` Mike Rapoport
2026-09-08 7:40 ` Mike Rapoport via OP-TEE
2026-09-08 9:18 ` Thierry Reding
2026-09-08 9:18 ` Thierry Reding via OP-TEE
2026-09-08 10:17 ` Mike Rapoport via OP-TEE
2026-09-08 10:17 ` Mike Rapoport
2026-09-02 10:47 ` [PATCH v9 02/10] of: reserved_mem: Introduce "ll-map" property Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 11:02 ` sashiko-bot
2026-09-02 17:24 ` Rob Herring
2026-09-02 17:24 ` Rob Herring via OP-TEE
2026-09-03 10:03 ` Vincent Donnefort [this message]
2026-09-03 10:03 ` Vincent Donnefort via OP-TEE
2026-09-07 14:00 ` Thierry Reding
2026-09-07 14:00 ` Thierry Reding via OP-TEE
2026-09-07 17:03 ` Vincent Donnefort
2026-09-07 17:03 ` Vincent Donnefort via OP-TEE
2026-09-02 10:47 ` [PATCH v9 03/10] set_memory.h: Introduce can_set_direct_map_range() Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-06 19:39 ` Mike Rapoport via OP-TEE
2026-09-06 19:39 ` Mike Rapoport
2026-09-07 9:52 ` Vincent Donnefort
2026-09-07 9:52 ` Vincent Donnefort via OP-TEE
2026-09-02 10:47 ` [PATCH v9 04/10] set_memory.h: Introduce __set_direct_map*() Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 10:47 ` [PATCH v9 05/10] arm64: can_set_direct_map() if BBML3 Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 11:09 ` sashiko-bot
2026-09-02 10:47 ` [PATCH v9 06/10] arm64: Implement can_set_direct_map_range() Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 11:06 ` sashiko-bot
2026-09-02 10:47 ` [PATCH v9 07/10] arm64: Implement __set_direct_map*() Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-08 9:27 ` Thierry Reding
2026-09-08 9:27 ` Thierry Reding via OP-TEE
2026-09-02 10:47 ` [PATCH v9 08/10] arm64: Add support for MEMBLOCK_LLMAP Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 10:47 ` [PATCH v9 09/10] firmware: arm_ffa: Introduce ffa-lend-pool Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 11:06 ` sashiko-bot
2026-09-02 17:38 ` Rob Herring
2026-09-02 17:38 ` Rob Herring via OP-TEE
2026-09-03 10:10 ` Vincent Donnefort
2026-09-03 10:10 ` Vincent Donnefort via OP-TEE
2026-09-02 10:47 ` [PATCH v9 10/10] optee: Add support for arm,ffa-lend-pool Vincent Donnefort
2026-09-02 10:47 ` Vincent Donnefort via OP-TEE
2026-09-02 11:09 ` sashiko-bot
2026-09-02 13:27 ` [PATCH v9 00/10] arm64: Unmap FF-A lent memory from direct map Vincent Donnefort
2026-09-02 13:27 ` Vincent Donnefort via OP-TEE
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