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GET /api/patches/2219618/?format=api
{ "id": 2219618, "url": "http://patchwork.ozlabs.org/api/patches/2219618/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260403153019.9916-4-fangyu.yu@linux.alibaba.com/", "project": { "id": 70, "url": "http://patchwork.ozlabs.org/api/projects/70/?format=api", "name": "Linux KVM RISC-V", "link_name": "kvm-riscv", "list_id": "kvm-riscv.lists.infradead.org", "list_email": "kvm-riscv@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "http://lists.infradead.org/pipermail/kvm-riscv/", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260403153019.9916-4-fangyu.yu@linux.alibaba.com>", "list_archive_url": null, "date": "2026-04-03T15:30:18", "name": "[v8,3/3] RISC-V: KVM: Reuse KVM_CAP_VM_GPA_BITS to select HGATP.MODE", "commit_ref": null, "pull_url": null, "state": "accepted", "archived": false, "hash": "fc7ded54544e7965ac9072ddf6fbd6f8268a4f9f", "submitter": { "id": 91416, "url": "http://patchwork.ozlabs.org/api/people/91416/?format=api", "name": null, "email": "fangyu.yu@linux.alibaba.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260403153019.9916-4-fangyu.yu@linux.alibaba.com/mbox/", "series": [ { "id": 498644, "url": "http://patchwork.ozlabs.org/api/series/498644/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/list/?series=498644", "date": "2026-04-03T15:30:17", "name": "Support runtime configuration for per-VM's HGATP mode", "version": 8, "mbox": "http://patchwork.ozlabs.org/series/498644/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219618/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219618/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "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=yk5+vJDh;\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=rPqPVFoZ;\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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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=cLxKVBxcaxF7YL8NCkoZftmVqO25ubrNMqO6XpRJBjA=; b=yk5+vJDhpSAfp9\n\tI5wupCpDlcRS/roQ4CkZF4gtgkNG97y6oRCAChISNiuBHT0orQSb18h4HF/LhhGsq7ac/JMB+OIyl\n\ti36JekjGNPRpU/cfCuM/xUPPx+xMJdqm3V5+lB5uxkxNLwpz+sbEksBEPyzh8kBzLg0zO//wrOkLW\n\tOcwajDvua0mns0Ne0BksgTlcO7frmNkJgqZchvZMYiMpg8JUAL8kin9wHiEMlS8XhZPoE+jRWE5JY\n\t3F2gNEVVI/ufvZrfr3fZcGO1tdFrvx0JfML0cZmHitQUJJ6LoNDhZjqvaPCPmaGMqoYvT9+02PgrM\n\t6SVjxKaJXgqDI+Z2XTPg==;", "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=linux.alibaba.com; s=default;\n\tt=1775230230; h=From:To:Subject:Date:Message-Id:MIME-Version;\n\tbh=vAXnuXYy5CVxib+kdtLGkhTwGblq2YVJ173NjMXO3mM=;\n\tb=rPqPVFoZShPknHQRgyK2fvbT6hs/MBJeuJwC2kU+gwEsKbYBCgUermDj8cVHQ2/p/maB4mgA3aiZmBFE16I+ChUVrCoUdBVHElbgBmiw0t1f2OUy32bvtHra/hS27QGHvyjYnR+Kh4pdK+sy2eau4QGYhD2yEz0zsmeLN2jaXgg=" ], "X-Alimail-AntiSpam": "\n AC=PASS;BC=-1|-1;BR=01201311R161e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037009110;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=18;SR=0;TI=SMTPD_---0X0KbxUp_1775230226;", "From": "fangyu.yu@linux.alibaba.com", "To": "pbonzini@redhat.com,\n\tcorbet@lwn.net,\n\tanup@brainfault.org,\n\tatish.patra@linux.dev,\n\tpjw@kernel.org,\n\tpalmer@dabbelt.com,\n\taou@eecs.berkeley.edu,\n\talex@ghiti.fr,\n\tskhan@linuxfoundation.org", "Cc": "guoren@kernel.org,\n\tradim.krcmar@oss.qualcomm.com,\n\tandrew.jones@oss.qualcomm.com,\n\tlinux-doc@vger.kernel.org,\n\tkvm@vger.kernel.org,\n\tkvm-riscv@lists.infradead.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-kernel@vger.kernel.org,\n\tFangyu Yu <fangyu.yu@linux.alibaba.com>", "Subject": "[PATCH v8 3/3] RISC-V: KVM: Reuse KVM_CAP_VM_GPA_BITS to select\n HGATP.MODE", "Date": "Fri, 3 Apr 2026 23:30:18 +0800", "Message-Id": "<20260403153019.9916-4-fangyu.yu@linux.alibaba.com>", "X-Mailer": "git-send-email 2.39.3 (Apple Git-146)", "In-Reply-To": "<20260403153019.9916-1-fangyu.yu@linux.alibaba.com>", "References": "<20260403153019.9916-1-fangyu.yu@linux.alibaba.com>", "MIME-Version": "1.0", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20260403_083035_151552_1337F1F1 ", "X-CRM114-Status": "UNSURE ( 8.63 )", "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. 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: From: Fangyu Yu <fangyu.yu@linux.alibaba.com> Reuse\n KVM_CAP_VM_GPA_BITS\n to advertise and select the effective G-stage GPA width for a VM.\n KVM_CHECK_EXTENSION(KVM_CAP_VM_GPA_BITS)\n returns the effective GPA bits for a VM,\n KVM_ENABLE_CAP(KVM_CAP_VM_GPA_BITS)\n allows userspace to downsize the effective GPA width by selecting a\n smaller\n G-stag [...]\n Content analysis details: (-17.6 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n 0.0 RCVD_IN_VALIDITY_SAFE_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to\n Validity was blocked. See\n https://knowledge.validity.com/hc/en-us/articles/20961730681243\n for more information.\n [115.124.30.131 listed in sa-accredit.habeas.com]\n 0.0 RCVD_IN_VALIDITY_CERTIFIED_BLOCKED RBL: ADMINISTRATOR NOTICE: The\n query to Validity was blocked. See\n https://knowledge.validity.com/hc/en-us/articles/20961730681243\n for more information.\n [115.124.30.131 listed in\n sa-trusted.bondedsender.org]\n 0.0 RCVD_IN_VALIDITY_RPBL_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to\n Validity was blocked. See\n https://knowledge.validity.com/hc/en-us/articles/20961730681243\n for more information.\n [115.124.30.131 listed in\n bl.score.senderscore.com]\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [115.124.30.131 listed in list.dnswl.org]\n -7.5 USER_IN_DEF_SPF_WL From: address is in the default SPF welcome-list\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.0 SPF_PASS SPF: sender matches SPF record\n -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM welcome-list\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n -0.5 ENV_AND_HDR_SPF_MATCH Env and Hdr From used in default SPF WL Match\n 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay\n lines", "X-BeenThere": "kvm-riscv@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<kvm-riscv.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/kvm-riscv>,\n <mailto:kvm-riscv-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/kvm-riscv/>", "List-Post": "<mailto:kvm-riscv@lists.infradead.org>", "List-Help": "<mailto:kvm-riscv-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/kvm-riscv>,\n <mailto:kvm-riscv-request@lists.infradead.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"kvm-riscv\" <kvm-riscv-bounces@lists.infradead.org>", "Errors-To": "kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "From: Fangyu Yu <fangyu.yu@linux.alibaba.com>\n\nReuse KVM_CAP_VM_GPA_BITS to advertise and select the effective\nG-stage GPA width for a VM.\n\nKVM_CHECK_EXTENSION(KVM_CAP_VM_GPA_BITS) returns the effective GPA\nbits for a VM, KVM_ENABLE_CAP(KVM_CAP_VM_GPA_BITS) allows userspace\nto downsize the effective GPA width by selecting a smaller G-stage\npage table format:\n - gpa_bits <= 41 selects Sv39x4 (pgd_levels=3)\n - gpa_bits <= 50 selects Sv48x4 (pgd_levels=4)\n - gpa_bits <= 59 selects Sv57x4 (pgd_levels=5)\n\nReject the request with -EINVAL for unsupported values and with -EBUSY\nif vCPUs have been created or any memslot is populated.\n\nSigned-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>\nReviewed-by: Andrew Jones <andrew.jones@oss.qualcomm.com>\nReviewed-by: Guo Ren <guoren@kernel.org>\n---\n arch/riscv/kvm/vm.c | 44 ++++++++++++++++++++++++++++++++++++++++++--\n 1 file changed, 42 insertions(+), 2 deletions(-)", "diff": "diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c\nindex fb7c4e07961f..a9f083feeb76 100644\n--- a/arch/riscv/kvm/vm.c\n+++ b/arch/riscv/kvm/vm.c\n@@ -214,12 +214,52 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)\n \n int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)\n {\n+\tif (cap->flags)\n+\t\treturn -EINVAL;\n+\n \tswitch (cap->cap) {\n \tcase KVM_CAP_RISCV_MP_STATE_RESET:\n-\t\tif (cap->flags)\n-\t\t\treturn -EINVAL;\n \t\tkvm->arch.mp_state_reset = true;\n \t\treturn 0;\n+\tcase KVM_CAP_VM_GPA_BITS: {\n+\t\tunsigned long gpa_bits = cap->args[0];\n+\t\tunsigned long new_levels;\n+\t\tint r = 0;\n+\n+\t\t/* Decide target pgd levels from requested gpa_bits */\n+#ifdef CONFIG_64BIT\n+\t\tif (gpa_bits <= 41)\n+\t\t\tnew_levels = 3; /* Sv39x4 */\n+\t\telse if (gpa_bits <= 50)\n+\t\t\tnew_levels = 4; /* Sv48x4 */\n+\t\telse if (gpa_bits <= 59)\n+\t\t\tnew_levels = 5; /* Sv57x4 */\n+\t\telse\n+\t\t\treturn -EINVAL;\n+#else\n+\t\t/* 32-bit: only Sv32x4*/\n+\t\tif (gpa_bits <= 34)\n+\t\t\tnew_levels = 2;\n+\t\telse\n+\t\t\treturn -EINVAL;\n+#endif\n+\t\tif (new_levels > kvm_riscv_gstage_max_pgd_levels)\n+\t\t\treturn -EINVAL;\n+\n+\t\t/* Follow KVM's lock ordering: kvm->lock -> kvm->slots_lock. */\n+\t\tmutex_lock(&kvm->lock);\n+\t\tmutex_lock(&kvm->slots_lock);\n+\n+\t\tif (kvm->created_vcpus || !kvm_are_all_memslots_empty(kvm))\n+\t\t\tr = -EBUSY;\n+\t\telse\n+\t\t\tkvm->arch.pgd_levels = new_levels;\n+\n+\t\tmutex_unlock(&kvm->slots_lock);\n+\t\tmutex_unlock(&kvm->lock);\n+\n+\t\treturn r;\n+\t}\n \tdefault:\n \t\treturn -EINVAL;\n \t}\n", "prefixes": [ "v8", "3/3" ] }