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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-50dd5651482sm43650061cf.31.2026.04.11.05.47.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Apr 2026 05:47:47 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wBXkY-00000002Xgq-4AP9; Sat, 11 Apr 2026 09:47:47 -0300 Date: Sat, 11 Apr 2026 09:47:46 -0300 From: Jason Gunthorpe To: fangyu.yu@linux.alibaba.com Cc: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, tjeznach@rivosinc.com, kevin.tian@intel.com, baolu.lu@linux.intel.com, vasant.hegde@amd.com, guoren@kernel.org, iommu@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V Svpbmt bits Message-ID: <20260411124746.GF3694781@ziepe.ca> References: <20260411022223.91029-1-fangyu.yu@linux.alibaba.com> <20260411022223.91029-3-fangyu.yu@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260411022223.91029-3-fangyu.yu@linux.alibaba.com> On Sat, Apr 11, 2026 at 10:22:23AM +0800, fangyu.yu@linux.alibaba.com wrote: > From: Fangyu Yu > > When the RISC-V IOMMU page table format support Svpbmt, PBMT provides > a way to tag mappings with page-based memory types. Encode memory type > via PBMT in RISC-V IOMMU PTEs: > > - IOMMU_MMIO -> PBMT=IO > - !IOMMU_CACHE -> PBMT=NC > - otherwise -> PBMT=Normal (PBMT=0) > > Clear the PBMT field before applying the selected encoding, and only > touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised. > > Signed-off-by: Fangyu Yu > --- > drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++ > 1 file changed, 9 insertions(+) Reviewed-by: Jason Gunthorpe This is similar to ARM now with the 3 kinds.. Jason