[{"id":3672843,"web_url":"http://patchwork.ozlabs.org/comment/3672843/","msgid":"","list_archive_url":null,"date":"2026-04-02T18:03:27","subject":"Re: [PATCH v7 1/4] RISC-V: KVM: Support runtime configuration for\n per-VM's HGATP mode","submitter":{"id":92440,"url":"http://patchwork.ozlabs.org/api/people/92440/","name":"Radim Krčmář","email":"radim.krcmar@oss.qualcomm.com"},"content":"2026-04-02T21:23:00+08:00, :\n> From: Fangyu Yu \n>\n> Introduces one per-VM architecture-specific fields to support runtime\n> configuration of the G-stage page table format:\n>\n> - kvm->arch.pgd_levels: the corresponding number of page table levels\n> for the selected mode.\n>\n> These fields replace the previous global variables\n> kvm_riscv_gstage_mode and kvm_riscv_gstage_pgd_levels, enabling different\n> virtual machines to independently select their G-stage page table format\n> instead of being forced to share the maximum mode detected by the kernel\n> at boot time.\n>\n> Signed-off-by: Fangyu Yu \n> Reviewed-by: Andrew Jones \n> Reviewed-by: Anup Patel \n> Reviewed-by: Guo Ren \n> ---\n> diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c\n> @@ -199,7 +199,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)\n> \t\tr = KVM_USER_MEM_SLOTS;\n> \t\tbreak;\n> \tcase KVM_CAP_VM_GPA_BITS:\n> -\t\tr = kvm_riscv_gstage_gpa_bits;\n> +\t\tr = kvm_riscv_gstage_gpa_bits(kvm->arch.pgd_levels);\n\nkvm_vm_ioctl_check_extension() also gets called from with kvm == NULL\nfrom kvm_dev_ioctl(). I think we can continue to return\n...(kvm_riscv_gstage_max_pgd_levels) in that case.\n\nThanks.","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=hB7oqeHV;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=baEI5sjF;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=TY6vSi/B;\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; helo=bombadil.infradead.org;\n envelope-from=kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fmqTz6pdBz1yCs\n\tfor ; Fri, 03 Apr 2026 05:03:35 +1100 (AEDT)","from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1w8MOE-00000000d3D-111i;\n\tThu, 02 Apr 2026 18:03:34 +0000","from mx0a-0031df01.pphosted.com ([205.220.168.131])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1w8MOC-00000000d25-0znL\n\tfor kvm-riscv@lists.infradead.org;\n\tThu, 02 Apr 2026 18:03:33 +0000","from pps.filterd (m0279863.ppops.net [127.0.0.1])\n\tby mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n 632G4Y2n1562140\n\tfor ; Thu, 2 Apr 2026 18:03:31 GMT","from mail-vs1-f71.google.com (mail-vs1-f71.google.com\n [209.85.217.71])\n\tby mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4d9um70f6t-1\n\t(version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT)\n\tfor ; Thu, 02 Apr 2026 18:03:31 +0000 (GMT)","by mail-vs1-f71.google.com with SMTP id\n ada2fe7eead31-6054bec610fso187121137.0\n for ;\n Thu, 02 Apr 2026 11:03:31 -0700 (PDT)","from localhost (ip-86-49-249-15.bb.vodafone.cz. 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See\n https://knowledge.validity.com/hc/en-us/articles/20961730681243\n for more information.\n [205.220.168.131 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":3672962,"web_url":"http://patchwork.ozlabs.org/comment/3672962/","msgid":"<20260403021314.37990-1-fangyu.yu@linux.alibaba.com>","list_archive_url":null,"date":"2026-04-03T02:13:14","subject":"Re: Re: [PATCH v7 1/4] RISC-V: KVM: Support runtime configuration for\n per-VM's HGATP mode ","submitter":{"id":91416,"url":"http://patchwork.ozlabs.org/api/people/91416/","name":null,"email":"fangyu.yu@linux.alibaba.com"},"content":">> From: Fangyu Yu \n>>\n>> Introduces one per-VM architecture-specific fields to support runtime\n>> configuration of the G-stage page table format:\n>>\n>> - kvm->arch.pgd_levels: the corresponding number of page table levels\n>> for the selected mode.\n>>\n>> These fields replace the previous global variables\n>> kvm_riscv_gstage_mode and kvm_riscv_gstage_pgd_levels, enabling different\n>> virtual machines to independently select their G-stage page table format\n>> instead of being forced to share the maximum mode detected by the kernel\n>> at boot time.\n>>\n>> Signed-off-by: Fangyu Yu \n>> Reviewed-by: Andrew Jones \n>> Reviewed-by: Anup Patel \n>> Reviewed-by: Guo Ren \n>> ---\n>> diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c\n>> @@ -199,7 +199,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)\n>> \t\tr = KVM_USER_MEM_SLOTS;\n>> \t\tbreak;\n>> \tcase KVM_CAP_VM_GPA_BITS:\n>> -\t\tr = kvm_riscv_gstage_gpa_bits;\n>> +\t\tr = kvm_riscv_gstage_gpa_bits(kvm->arch.pgd_levels);\n>\n>kvm_vm_ioctl_check_extension() also gets called from with kvm == NULL\n>from kvm_dev_ioctl(). I think we can continue to return\n>...(kvm_riscv_gstage_max_pgd_levels) in that case.\n>\n\nThanks for catching this. I’ll handle the kvm == NULL case (from kvm_dev_ioctl)\nand return the host maximum based on kvm_riscv_gstage_max_pgd_levels in v8.\n\nAlso, if the intended semantics of KVM_CAP_VM_GPA_BITS is to report the maximum\nsupported value, then we could simply always return the host maximum based on\nkvm_riscv_gstage_max_pgd_levels.\n\nThanks,\nFangyu\n\n>Thanks.","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=zgXn33xX;\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=mlDGxAUH;\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; helo=bombadil.infradead.org;\n envelope-from=kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fn2M95Dxmz1yCs\n\tfor ; Fri, 03 Apr 2026 13:13:25 +1100 (AEDT)","from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1w8U2F-000000015jG-37HF;\n\tFri, 03 Apr 2026 02:13:23 +0000","from out30-97.freemail.mail.aliyun.com ([115.124.30.97])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1w8U2C-000000015it-3mhm;\n\tFri, 03 Apr 2026 02:13:22 +0000","from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com\n fp:SMTPD_---0X0IcLEJ_1775182395 cluster:ay36)\n by smtp.aliyun-inc.com;\n Fri, 03 Apr 2026 10:13:16 +0800"],"DKIM-Signature":["v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:\n\tMessage-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=82avWECDAGzYkZqfcq8daGLp5Z+clluOa8YubR6gsSc=; b=zgXn33xXxYyRYv\n\tZClGYjuM87B3R2pKT4HFTvQaeo0NyFzCEQVZ+fm5+eQmmvwOdL387u+rpVlK/kTxWRYAEyA2yk/JB\n\t42+jCsotYczcDEVERjDq4X2T8SmroOgGYqGn8gIPnYk/rjKnWz5voLEjab3ZVnTle5LKAf1JPvdFr\n\tXkWgY9xFTYyiO9rp3RAW8/GsuKfcAqSWM/Rq0/GisfwjINAaLjgTYtsx3B4iWQGCqSxdOmg1rqd6l\n\t+++7LdDJoN7+9hnyPllpCFNK3qnoNKRfhAuXBd15zCPgZoE35sGMNgr+yukmWB5wDka076WOkSzN5\n\tz5CRxy2nxu8koXW9rZ2g==;","v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=linux.alibaba.com; s=default;\n\tt=1775182398; h=From:To:Subject:Date:Message-Id:MIME-Version:Content-Type;\n\tbh=gocmGB7MJ4Q1qvd4NluMp0l37EG2b31vDelpHwCN26o=;\n\tb=mlDGxAUHRd8Tjlg6LeYnPcDMdFiBxJ3R2xbzbgvdUx/e3h5he4W3zu0R7nydAJnr/NfuX6XcjPoabc5IU9pGVFxaohuf24roBmHqPvzthKPCjqpiMl8a19faYH4zSnNUFZGa4XqAPnzyBSWwJcRaeJBD3BY/yMc3Q613HucHZpo="],"X-Alimail-AntiSpam":"\n AC=PASS;BC=-1|-1;BR=01201311R731e4;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=18;SR=0;TI=SMTPD_---0X0IcLEJ_1775182395;","From":"fangyu.yu@linux.alibaba.com","To":"radim.krcmar@oss.qualcomm.com","Cc":"alex@ghiti.fr,\n\tandrew.jones@oss.qualcomm.com,\n\tanup@brainfault.org,\n\taou@eecs.berkeley.edu,\n\tatish.patra@linux.dev,\n\tcorbet@lwn.net,\n\tfangyu.yu@linux.alibaba.com,\n\tguoren@kernel.org,\n\tkvm-riscv@lists.infradead.org,\n\tkvm@vger.kernel.org,\n\tlinux-doc@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-riscv@lists.infradead.org,\n\tpalmer@dabbelt.com,\n\tpbonzini@redhat.com,\n\tpjw@kernel.org,\n\tskhan@linuxfoundation.org","Subject":"Re: Re: [PATCH v7 1/4] RISC-V: KVM: Support runtime configuration for\n per-VM's HGATP mode ","Date":"Fri, 3 Apr 2026 10:13:14 +0800","Message-Id":"<20260403021314.37990-1-fangyu.yu@linux.alibaba.com>","X-Mailer":"git-send-email 2.39.3 (Apple Git-146)","In-Reply-To":"","References":"","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20260402_191321_477394_2AA03D4C ","X-CRM114-Status":"UNSURE ( 8.21 )","X-CRM114-Notice":"Please train this message.","X-Spam-Score":"-17.6 (-----------------)","X-Spam-Report":"Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. 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