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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8f7c48c71f3sm197040285a.7.2026.04.28.06.32.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2026 06:32:40 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wHiYJ-0000000AhcL-1zNy; Tue, 28 Apr 2026 10:32:39 -0300 Date: Tue, 28 Apr 2026 10:32:39 -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, anup@brainfault.org, atish.patra@linux.dev, skhawaja@google.com, guoren@kernel.org, kvm@vger.kernel.org, iommu@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp) page table support Message-ID: <20260428133239.GC849557@ziepe.ca> References: <20260428131359.34872-1-fangyu.yu@linux.alibaba.com> <20260428131359.34872-2-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: <20260428131359.34872-2-fangyu.yu@linux.alibaba.com> On Tue, Apr 28, 2026 at 09:13:49PM +0800, fangyu.yu@linux.alibaba.com wrote: > @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct pt_iommu_riscv_64 *iommu_table, > case 57: > pt_top_set_level(&table->common, 4); > break; > + /* > + * Second-stage (iohgatp): Sv39x4 / Sv48x4 / Sv57x4. > + * The top level is the same as for the first-stage counterpart. > + */ > + case 41: > + pt_top_set_level(&table->common, 2); > + table->second_stage = true; > + break; Second stage needs to be an explicit PT_FEAT not implicitly deduced based on the vasz. Jason