Re: [PATCH v2 8/8] riscv: mm: Add support for ZONE_DEVICE

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To: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, linux-riscv@xxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH v2 8/8] riscv: mm: Add support for ZONE_DEVICE
From: Björn Töpel <bjorn@xxxxxxxxxx>
Date: Wed, 15 May 2024 09:03:02 +0200
Cc: Björn Töpel <bjorn@xxxxxxxxxxxx>, Andrew Bresticker <abrestic@xxxxxxxxxxxx>, Chethan Seshadri <Chethan.Seshadri@xxxxxxxxxxxxxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, Oscar Salvador <osalvador@xxxxxxx>, Santosh Mamila <santosh.mamila@xxxxxxxxxxxxxxxxxx>, Sivakumar Munnangi <siva.munnangi@xxxxxxxxxxxxxxxxxx>, Sunil V L <sunilvl@xxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
In-reply-to: <20240514140446.538622-9-bjorn@kernel.org>
References: <20240514140446.538622-1-bjorn@kernel.org> <20240514140446.538622-9-bjorn@kernel.org>

Björn Töpel <bjorn@xxxxxxxxxx> writes:

> From: Björn Töpel <bjorn@xxxxxxxxxxxx>
>
> ZONE_DEVICE pages need DEVMAP PTEs support to function
> (ARCH_HAS_PTE_DEVMAP). Claim another RSW (reserved for software) bit
> in the PTE for DEVMAP mark, add the corresponding helpers, and enable
> ARCH_HAS_PTE_DEVMAP for riscv64.

...and this patch has rv32 build issues. Will fix as well.

References:
- [PATCH v2 0/8] riscv: Memory Hot(Un)Plug support
  - From: Björn Töpel
- [PATCH v2 8/8] riscv: mm: Add support for ZONE_DEVICE
  - From: Björn Töpel

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