From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-111.freemail.mail.aliyun.com (out30-111.freemail.mail.aliyun.com [115.124.30.111]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 874751B81CA; Wed, 29 Apr 2026 01:07:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.111 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777424823; cv=none; b=YnqSkt8wUWAj4/HZH8e8WCAm6WXJ4gqEVrtEQBMaSDrljQsEWD/56Yh7GSdWjEeEj+IR95w7QgbYehkCwhA7dbB9qoHGFDxHpAkx9eA2TRBhvZySVN0fvkVZ8WYea2yfjsFQLa2FiEIJ+xb5dJAmMx0Rz+y58TZVRW+ulwS4L1s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777424823; c=relaxed/simple; bh=dR0nfY6GEZ3yOr/Ehd4BMntDHEqTN2fTGWOfpFmvskU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=CF9aHLlaQW2aiAfY00OPDC01linIl0pfRFbqG2hxLs3JgfOOMVueTZgwIxWqJ1SjRv5Ham+lQkwbvtOxJmIQ89scpHvOO5hyJmKRwQxvhCy9oVoyy52uL2aCqZd1Id7g5Q45SoRmr9rFweeqGecciNjKnhnohPB0CD4c+KkQf04= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=ltoCIyug; arc=none smtp.client-ip=115.124.30.111 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="ltoCIyug" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1777424818; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=ZIGgm1LnnTKQYeHSW75Afg46i5j+k0U/fuPrhUWSwJ4=; b=ltoCIyuggRdxHP386ZWGJhSRq3bqkpitH2iY0Zf91TfX8dk28HOqzfEHSI+Fh3cp3dkuVBC/1/ndUjAVNSQWZyCsJqDsSSaBjFEJ1G7xRPfV1UgIG2BhjjG5ZkqHfCd6dm7RrOI7emjsTVi/SEzLeOuDIeTyVgDx6FT1iySJAZg= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R361e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037026112;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=22;SR=0;TI=SMTPD_---0X1vlBef_1777424814; Received: from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com fp:SMTPD_---0X1vlBef_1777424814 cluster:ay36) by smtp.aliyun-inc.com; Wed, 29 Apr 2026 09:06:56 +0800 From: fangyu.yu@linux.alibaba.com To: jgg@ziepe.ca Cc: alex@ghiti.fr, anup@brainfault.org, aou@eecs.berkeley.edu, atish.patra@linux.dev, baolu.lu@linux.intel.com, fangyu.yu@linux.alibaba.com, guoren@kernel.org, iommu@lists.linux.dev, joro@8bytes.org, kevin.tian@intel.com, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, palmer@dabbelt.com, pjw@kernel.org, robin.murphy@arm.com, skhawaja@google.com, tjeznach@rivosinc.com, vasant.hegde@amd.com, will@kernel.org Subject: Re: Re: [RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp) page table support Date: Wed, 29 Apr 2026 09:06:50 +0800 Message-Id: <20260429010650.61646-1-fangyu.yu@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20260428133239.GC849557@ziepe.ca> References: <20260428133239.GC849557@ziepe.ca> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit >> @@ -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. Agreed. I will add an explicit PT_FEAT_RISCV_SECOND_STAGE flag and stop deriving second-stage semantics from vasz. Thanks, Fangyu > >Jason