[{"id":3676146,"web_url":"http://patchwork.ozlabs.org/comment/3676146/","msgid":"<20260411124746.GF3694781@ziepe.ca>","list_archive_url":null,"date":"2026-04-11T12:47:46","subject":"Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","submitter":{"id":73018,"url":"http://patchwork.ozlabs.org/api/people/73018/","name":"Jason Gunthorpe","email":"jgg@ziepe.ca"},"content":"On Sat, Apr 11, 2026 at 10:22:23AM +0800, fangyu.yu@linux.alibaba.com wrote:\n> From: Fangyu Yu \n> \n> When the RISC-V IOMMU page table format support Svpbmt, PBMT provides\n> a way to tag mappings with page-based memory types. Encode memory type\n> via PBMT in RISC-V IOMMU PTEs:\n> \n> - IOMMU_MMIO -> PBMT=IO\n> - !IOMMU_CACHE -> PBMT=NC\n> - otherwise -> PBMT=Normal (PBMT=0)\n> \n> Clear the PBMT field before applying the selected encoding, and only\n> touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised.\n> \n> Signed-off-by: Fangyu Yu \n> ---\n> drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n\nReviewed-by: Jason Gunthorpe \n\nThis is similar to ARM now with the 3 kinds..\n\nJason","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=Pose2LLp;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n secure) header.d=ziepe.ca header.i=@ziepe.ca header.a=rsa-sha256\n header.s=google header.b=TL14iAw9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: On Sat, Apr 11, 2026 at 10:22:23AM +0800,\n fangyu.yu@linux.alibaba.com\n wrote: > From: Fangyu Yu > > When the RISC-V\n IOMMU page table format support Svpbmt, PBMT provides > [...]\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [2607:f8b0:4864:20:0:0:0:82f listed in]\n [list.dnswl.org]\n -0.0 SPF_PASS SPF: sender matches SPF record\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":3676187,"web_url":"http://patchwork.ozlabs.org/comment/3676187/","msgid":"","list_archive_url":null,"date":"2026-04-11T16:51:53","subject":"Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","submitter":{"id":33417,"url":"http://patchwork.ozlabs.org/api/people/33417/","name":"Anup Patel","email":"anup@brainfault.org"},"content":"On Sat, Apr 11, 2026 at 7:52 AM wrote:\n>\n> From: Fangyu Yu \n>\n> When the RISC-V IOMMU page table format support Svpbmt, PBMT provides\n> a way to tag mappings with page-based memory types. Encode memory type\n> via PBMT in RISC-V IOMMU PTEs:\n>\n> - IOMMU_MMIO -> PBMT=IO\n> - !IOMMU_CACHE -> PBMT=NC\n> - otherwise -> PBMT=Normal (PBMT=0)\n>\n> Clear the PBMT field before applying the selected encoding, and only\n> touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised.\n>\n> Signed-off-by: Fangyu Yu \n\nLooks good from RISC-V perspective.\n\nReviewed-by: Anup Patel \n\nRegards,\nAnup\n\n\n> ---\n> drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n>\n> diff --git a/drivers/iommu/generic_pt/fmt/riscv.h b/drivers/iommu/generic_pt/fmt/riscv.h\n> index a7fef6266a36..02051bb3c6e5 100644\n> --- a/drivers/iommu/generic_pt/fmt/riscv.h\n> +++ b/drivers/iommu/generic_pt/fmt/riscv.h\n> @@ -58,6 +58,8 @@ enum {\n> RISCVPT_G = BIT(5),\n> RISCVPT_A = BIT(6),\n> RISCVPT_D = BIT(7),\n> + RISCVPT_NC = BIT(61),\n> + RISCVPT_IO = BIT(62),\n> RISCVPT_RSW = GENMASK(9, 8),\n> RISCVPT_PPN32 = GENMASK(31, 10),\n>\n> @@ -237,6 +239,13 @@ static inline int riscvpt_iommu_set_prot(struct pt_common *common,\n> pte |= RISCVPT_R;\n> if (!(iommu_prot & IOMMU_NOEXEC))\n> pte |= RISCVPT_X;\n> + if (common->features & BIT(PT_FEAT_RISCV_SVPBMT)) {\n> + pte &= ~RISCVPT_PBMT;\n> + if (iommu_prot & IOMMU_MMIO)\n> + pte |= RISCVPT_IO;\n> + else if (!(iommu_prot & IOMMU_CACHE))\n> + pte |= RISCVPT_NC;\n> + }\n>\n> /* Caller must specify a supported combination of flags */\n> if (unlikely((pte & (RISCVPT_X | RISCVPT_W | RISCVPT_R)) == 0))\n> --\n> 2.50.1\n>\n>","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=KXg1qJFM;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=brainfault-org.20251104.gappssmtp.com\n header.i=@brainfault-org.20251104.gappssmtp.com header.a=rsa-sha256\n header.s=20251104 header.b=rhd8XWd1;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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Sat, 11 Apr 2026\n 09:52:04 -0700 (PDT)","MIME-Version":"1.0","References":"<20260411022223.91029-1-fangyu.yu@linux.alibaba.com>\n <20260411022223.91029-3-fangyu.yu@linux.alibaba.com>","In-Reply-To":"<20260411022223.91029-3-fangyu.yu@linux.alibaba.com>","From":"Anup Patel ","Date":"Sat, 11 Apr 2026 22:21:53 +0530","X-Gm-Features":"AQROBzC78r2FyJGwEr-mo33bIJuUYfyNgNHxCIGcYlLjmwSOUrGfuQso79gUj30","Message-ID":"\n ","Subject":"Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","To":"fangyu.yu@linux.alibaba.com","Cc":"joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org,\n\tpalmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr,\n\ttjeznach@rivosinc.com, jgg@ziepe.ca, kevin.tian@intel.com,\n\tbaolu.lu@linux.intel.com, vasant.hegde@amd.com, guoren@kernel.org,\n\tiommu@lists.linux.dev, kvm-riscv@lists.infradead.org,\n\tlinux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20260411_095206_578185_D6A280CE ","X-CRM114-Status":"GOOD ( 14.74 )","X-Spam-Score":"-1.9 (-)","X-Spam-Report":"Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: On Sat, Apr 11,\n 2026 at 7:52 AM \n wrote: > > From: Fangyu Yu > > When the\n RISC-V\n IOMMU page table format support Svpbmt, PBMT provides > a way [...]\n Content analysis details: (-1.9 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n 0.0 SPF_NONE SPF: sender does not publish an SPF Record\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [2607:f8b0:4864:20:0:0:0:335 listed in]\n [list.dnswl.org]","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":3676291,"web_url":"http://patchwork.ozlabs.org/comment/3676291/","msgid":"","list_archive_url":null,"date":"2026-04-12T14:08:17","subject":"Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","submitter":{"id":75626,"url":"http://patchwork.ozlabs.org/api/people/75626/","name":"Guo Ren","email":"guoren@kernel.org"},"content":"On Sat, Apr 11, 2026 at 10:22 AM wrote:\n>\n> From: Fangyu Yu \n>\n> When the RISC-V IOMMU page table format support Svpbmt, PBMT provides\n> a way to tag mappings with page-based memory types. Encode memory type\n> via PBMT in RISC-V IOMMU PTEs:\n>\n> - IOMMU_MMIO -> PBMT=IO\n> - !IOMMU_CACHE -> PBMT=NC\n> - otherwise -> PBMT=Normal (PBMT=0)\n>\n> Clear the PBMT field before applying the selected encoding, and only\n> touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised.\n>\n> Signed-off-by: Fangyu Yu \n> ---\n> drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n>\n> diff --git a/drivers/iommu/generic_pt/fmt/riscv.h b/drivers/iommu/generic_pt/fmt/riscv.h\n> index a7fef6266a36..02051bb3c6e5 100644\n> --- a/drivers/iommu/generic_pt/fmt/riscv.h\n> +++ b/drivers/iommu/generic_pt/fmt/riscv.h\n> @@ -58,6 +58,8 @@ enum {\n> RISCVPT_G = BIT(5),\n> RISCVPT_A = BIT(6),\n> RISCVPT_D = BIT(7),\n> + RISCVPT_NC = BIT(61),\n> + RISCVPT_IO = BIT(62),\n> RISCVPT_RSW = GENMASK(9, 8),\n> RISCVPT_PPN32 = GENMASK(31, 10),\n>\n> @@ -237,6 +239,13 @@ static inline int riscvpt_iommu_set_prot(struct pt_common *common,\n> pte |= RISCVPT_R;\n> if (!(iommu_prot & IOMMU_NOEXEC))\n> pte |= RISCVPT_X;\n> + if (common->features & BIT(PT_FEAT_RISCV_SVPBMT)) {\n> + pte &= ~RISCVPT_PBMT;\n> + if (iommu_prot & IOMMU_MMIO)\n> + pte |= RISCVPT_IO;\n> + else if (!(iommu_prot & IOMMU_CACHE))\n> + pte |= RISCVPT_NC;\n> + }\n>\n> /* Caller must specify a supported combination of flags */\n> if (unlikely((pte & (RISCVPT_X | RISCVPT_W | RISCVPT_R)) == 0))\n> --\n> 2.50.1\n>\nI'm okay with the current way of MMIO & CACHE mapping to IO & NC.\n\nReviewed-by: Guo Ren ","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=Gdi+rCCl;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=QCUHkeC/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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Sun, 12 Apr 2026\n 07:08:30 -0700 (PDT)","MIME-Version":"1.0","References":"<20260411022223.91029-1-fangyu.yu@linux.alibaba.com>\n <20260411022223.91029-3-fangyu.yu@linux.alibaba.com>","In-Reply-To":"<20260411022223.91029-3-fangyu.yu@linux.alibaba.com>","From":"Guo Ren ","Date":"Sun, 12 Apr 2026 22:08:17 +0800","X-Gmail-Original-Message-ID":"\n ","X-Gm-Features":"AQROBzC4Rc4aMZc6sUhMK9JYRkMncLQ0Cgf8xyWGV5aVeZpU8wsqLom86aWm950","Message-ID":"\n ","Subject":"Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","To":"fangyu.yu@linux.alibaba.com","Cc":"joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org,\n\tpalmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr,\n\ttjeznach@rivosinc.com, jgg@ziepe.ca, kevin.tian@intel.com,\n\tbaolu.lu@linux.intel.com, vasant.hegde@amd.com, iommu@lists.linux.dev,\n\tkvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org,\n\tlinux-kernel@vger.kernel.org","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":3676425,"web_url":"http://patchwork.ozlabs.org/comment/3676425/","msgid":"","list_archive_url":null,"date":"2026-04-13T03:23:50","subject":"Re: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","submitter":{"id":91422,"url":"http://patchwork.ozlabs.org/api/people/91422/","name":"Nutty.Liu","email":"nutty.liu@hotmail.com"},"content":"On 4/11/2026 10:22 AM, fangyu.yu@linux.alibaba.com wrote:\n> From: Fangyu Yu \n>\n> When the RISC-V IOMMU page table format support Svpbmt, PBMT provides\n> a way to tag mappings with page-based memory types. Encode memory type\n> via PBMT in RISC-V IOMMU PTEs:\n>\n> - IOMMU_MMIO -> PBMT=IO\n> - !IOMMU_CACHE -> PBMT=NC\n> - otherwise -> PBMT=Normal (PBMT=0)\n>\n> Clear the PBMT field before applying the selected encoding, and only\n> touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised.\n>\n> Signed-off-by: Fangyu Yu \n> ---\n> drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++\n> 1 file changed, 9 insertions(+)\nReviewed-by: Nutty Liu \n\nThanks,\nNutty","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=2rxgzAzL;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=hotmail.com header.i=@hotmail.com header.a=rsa-sha256\n header.s=selector1 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aou@eecs.berkeley.edu, alex@ghiti.fr, tjeznach@rivosinc.com, jgg@ziepe.ca,\n kevin.tian@intel.com, baolu.lu@linux.intel.com, vasant.hegde@amd.com","Cc":"guoren@kernel.org, iommu@lists.linux.dev, kvm-riscv@lists.infradead.org,\n linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org","References":"<20260411022223.91029-1-fangyu.yu@linux.alibaba.com>\n <20260411022223.91029-3-fangyu.yu@linux.alibaba.com>","Content-Language":"en-US","From":"\"Nutty.Liu\" ","In-Reply-To":"<20260411022223.91029-3-fangyu.yu@linux.alibaba.com>","X-ClientProxiedBy":"TP0P295CA0035.TWNP295.PROD.OUTLOOK.COM\n (2603:1096:910:4::17) To SE3PR04MB8922.apcprd04.prod.outlook.com\n (2603:1096:101:2e9::7)","X-Microsoft-Original-Message-ID":"\n 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The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: On 4/11/2026 10:22 AM,\n > From: Fangyu Yu > > When the RISC-V\n IOMMU page table format support Svpbmt,\n PBMT provides > a way to tag mappings\n with page-based memory types. Encode memory type > via P [...]\n Content analysis details: (-1.2 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 SPF_PASS SPF: sender matches SPF record\n -0.0 SPF_HELO_PASS SPF: HELO matches SPF record\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n 0.9 FORGED_HOTMAIL_RCVD2 hotmail.com 'From' address, but no 'Received:'\n 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail\n provider\n [nutty.liu(at)hotmail.com]","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Transfer-Encoding":"7bit","Content-Type":"text/plain; charset=\"us-ascii\"; Format=\"flowed\"","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":3676496,"web_url":"http://patchwork.ozlabs.org/comment/3676496/","msgid":"","list_archive_url":null,"date":"2026-04-13T06:53:31","subject":"RE: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits","submitter":{"id":4529,"url":"http://patchwork.ozlabs.org/api/people/4529/","name":"Tian, Kevin","email":"kevin.tian@intel.com"},"content":"> From: fangyu.yu@linux.alibaba.com \n> Sent: Saturday, April 11, 2026 10:22 AM\n> \n> From: Fangyu Yu \n> \n> When the RISC-V IOMMU page table format support Svpbmt, PBMT provides\n> a way to tag mappings with page-based memory types. Encode memory type\n> via PBMT in RISC-V IOMMU PTEs:\n> \n> - IOMMU_MMIO -> PBMT=IO\n> - !IOMMU_CACHE -> PBMT=NC\n\nIn concept IOMMU_CACHE is cleared when IOMMU_MMIO is set. From the\ncode PBMT=IO in this case.\n\nSo strictly speaking the 2nd line should be:\n\n - !IOMMU_MMIO && !IOMMU_CACHE -> PBMT=NC\n\n??\n\n> - otherwise -> PBMT=Normal (PBMT=0)\n> \n> Clear the PBMT field before applying the selected encoding, and only\n> touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised.\n> \n> Signed-off-by: Fangyu Yu \n> ---\n> drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++\n> 1 file changed, 9 insertions(+)\n> \n> diff --git a/drivers/iommu/generic_pt/fmt/riscv.h\n> b/drivers/iommu/generic_pt/fmt/riscv.h\n> index a7fef6266a36..02051bb3c6e5 100644\n> --- a/drivers/iommu/generic_pt/fmt/riscv.h\n> +++ b/drivers/iommu/generic_pt/fmt/riscv.h\n> @@ -58,6 +58,8 @@ enum {\n> \tRISCVPT_G = BIT(5),\n> \tRISCVPT_A = BIT(6),\n> \tRISCVPT_D = BIT(7),\n> +\tRISCVPT_NC = BIT(61),\n> +\tRISCVPT_IO = BIT(62),\n> \tRISCVPT_RSW = GENMASK(9, 8),\n> \tRISCVPT_PPN32 = GENMASK(31, 10),\n\nsort by bit positions\n\n> \n> @@ -237,6 +239,13 @@ static inline int riscvpt_iommu_set_prot(struct\n> pt_common *common,\n> \t\tpte |= RISCVPT_R;\n> \tif (!(iommu_prot & IOMMU_NOEXEC))\n> \t\tpte |= RISCVPT_X;\n> +\tif (common->features & BIT(PT_FEAT_RISCV_SVPBMT)) {\n> +\t\tpte &= ~RISCVPT_PBMT;\n\nthis is unnecessary due to the earlier assignment:\n\n\tpte = RISCVPT_A | RISCVPT_U;\n\n> +\t\tif (iommu_prot & IOMMU_MMIO)\n> +\t\t\tpte |= RISCVPT_IO;\n> +\t\telse if (!(iommu_prot & IOMMU_CACHE))\n> +\t\t\tpte |= RISCVPT_NC;\n> +\t}\n> \n> \t/* Caller must specify a supported combination of flags */\n> \tif (unlikely((pte & (RISCVPT_X | RISCVPT_W | RISCVPT_R)) == 0))\n> --\n> 2.50.1","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=SQ4ZSMPS;\n\tdkim=fail reason=\"signature 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If you have any questions, see\n the administrator of that system for details.\n Content preview: > From: fangyu.yu@linux.alibaba.com\n \n > Sent: Saturday, April 11,\n 2026 10:22 AM > > From: Fangyu Yu \n > > When the RISC-V IOMMU page table forma [...]\n Content analysis details: (-4.9 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/,\n medium trust\n [192.198.163.17 listed in list.dnswl.org]\n -0.0 SPF_PASS SPF: sender matches SPF record\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n 0.0 RCVD_IN_VALIDITY_CERTIFIED_BLOCKED RBL: ADMINISTRATOR NOTICE: The\n query to Validity was blocked. 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See\n https://knowledge.validity.com/hc/en-us/articles/20961730681243\n for more information.\n [192.198.163.17 listed in\n bl.score.senderscore.com]","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}},{"id":3676671,"web_url":"http://patchwork.ozlabs.org/comment/3676671/","msgid":"<20260413113645.28757-1-fangyu.yu@linux.alibaba.com>","list_archive_url":null,"date":"2026-04-13T11:36:45","subject":"Re: RE: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V\n Svpbmt bits ","submitter":{"id":91416,"url":"http://patchwork.ozlabs.org/api/people/91416/","name":null,"email":"fangyu.yu@linux.alibaba.com"},"content":">> From: fangyu.yu@linux.alibaba.com \n>> Sent: Saturday, April 11, 2026 10:22 AM\n>>\n>> From: Fangyu Yu \n>>\n>> When the RISC-V IOMMU page table format support Svpbmt, PBMT provides\n>> a way to tag mappings with page-based memory types. Encode memory type\n>> via PBMT in RISC-V IOMMU PTEs:\n>>\n>> - IOMMU_MMIO -> PBMT=IO\n>> - !IOMMU_CACHE -> PBMT=NC\n>\n>In concept IOMMU_CACHE is cleared when IOMMU_MMIO is set. From the\n>code PBMT=IO in this case.\n>\n>So strictly speaking the 2nd line should be:\n>\n> - !IOMMU_MMIO && !IOMMU_CACHE -> PBMT=NC\n>\n>??\n>\n\nAgree. I'll clarify the commit message accordingly to avoid implying\nthat the MMIO case could fall into the NC rule.\n\n>> - otherwise -> PBMT=Normal (PBMT=0)\n>>\n>> Clear the PBMT field before applying the selected encoding, and only\n>> touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised.\n>>\n>> Signed-off-by: Fangyu Yu \n>> ---\n>> drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++\n>> 1 file changed, 9 insertions(+)\n>>\n>> diff --git a/drivers/iommu/generic_pt/fmt/riscv.h\n>> b/drivers/iommu/generic_pt/fmt/riscv.h\n>> index a7fef6266a36..02051bb3c6e5 100644\n>> --- a/drivers/iommu/generic_pt/fmt/riscv.h\n>> +++ b/drivers/iommu/generic_pt/fmt/riscv.h\n>> @@ -58,6 +58,8 @@ enum {\n>> \tRISCVPT_G = BIT(5),\n>> \tRISCVPT_A = BIT(6),\n>> \tRISCVPT_D = BIT(7),\n>> +\tRISCVPT_NC = BIT(61),\n>> +\tRISCVPT_IO = BIT(62),\n>> \tRISCVPT_RSW = GENMASK(9, 8),\n>> \tRISCVPT_PPN32 = GENMASK(31, 10),\n>\n>sort by bit positions\n>\n\nGot it, will reorder in v2.\n\n>>\n>> @@ -237,6 +239,13 @@ static inline int riscvpt_iommu_set_prot(struct\n>> pt_common *common,\n>> \t\tpte |= RISCVPT_R;\n>> \tif (!(iommu_prot & IOMMU_NOEXEC))\n>> \t\tpte |= RISCVPT_X;\n>> +\tif (common->features & BIT(PT_FEAT_RISCV_SVPBMT)) {\n>> +\t\tpte &= ~RISCVPT_PBMT;\n>\n>this is unnecessary due to the earlier assignment:\n>\n>\tpte = RISCVPT_A | RISCVPT_U;\n>\n\nAs things stand it’s not needed, I'll drop it in v2.\n\n>> +\t\tif (iommu_prot & IOMMU_MMIO)\n>> +\t\t\tpte |= RISCVPT_IO;\n>> +\t\telse if (!(iommu_prot & IOMMU_CACHE))\n>> +\t\t\tpte |= RISCVPT_NC;\n>> +\t}\n>>\n>> \t/* Caller must specify a supported combination of flags */\n>> \tif (unlikely((pte & (RISCVPT_X | RISCVPT_W | RISCVPT_R)) == 0))\n>> --\n>> 2.50.1\n\nThanks,\nFangyu","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=rgEFKT7T;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=linux.alibaba.com header.i=@linux.alibaba.com\n header.a=rsa-sha256 header.s=default header.b=N5VGs7Y/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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