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{ "id": 2220433, "url": "http://patchwork.ozlabs.org/api/1.1/covers/2220433/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/cover/20260407171052241tmZDFGusMP_wlEsBVVtJo@zte.com.cn/", "project": { "id": 70, "url": "http://patchwork.ozlabs.org/api/1.1/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": "" }, "msgid": "<20260407171052241tmZDFGusMP_wlEsBVVtJo@zte.com.cn>", "date": "2026-04-07T09:10:52", "name": "[0/3] RISC-V: KVM: Huge page recovery during disable-dirty-log", "submitter": { "id": 91800, "url": "http://patchwork.ozlabs.org/api/1.1/people/91800/?format=api", "name": "", "email": "wang.yechao255@zte.com.cn" }, "mbox": "http://patchwork.ozlabs.org/project/kvm-riscv/cover/20260407171052241tmZDFGusMP_wlEsBVVtJo@zte.com.cn/mbox/", "series": [ { "id": 498947, "url": "http://patchwork.ozlabs.org/api/1.1/series/498947/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/list/?series=498947", "date": "2026-04-07T09:10:52", "name": "RISC-V: KVM: Huge page recovery during disable-dirty-log", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498947/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2220433/comments/", "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=0vf+i7Ru;\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:Subject:Cc:To:From:Mime-Version:Date:\n\tMessage-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:\n\tResent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:\n\tList-Owner; bh=hIeo1N8fY28OYACBxfZZaJfWoDH19kdH3E6NY0AP8i0=; b=0vf+i7Ru5OtsF2\n\tgJ/R1l02dbF87FBWjkNFvlO/CmBl0pZySweTRlnIB510a8rOTrPMccz+sT6dxxxXLfqsHwLcPVJ/D\n\tOYrEU1DZRMYY+cJx71GTwHkmWLWEtVMGgaiurEw8IRDxoS2teF/CBKTbaojbo2LKoO1yv2+OZbfSO\n\tQwj/9MCnBgteVW81tEAUS5JU1f60bGVcjfzm6IG5ZfIvQFg8GZMEUzmlIY0fP4SXMWNnujFI28Os0\n\tySf2+FToGwZtwsMkR8Vac08DUFPxo5kKVDRBYCC1QkHxaAP27xWJOUS59tGuPKriAxs4zIsr0KMSn\n\txBqbVRSOvlqoS1t28LdA==;", "X-Zmail-TransId": "2b0669d4ca1c880-bd28c", "X-Mailer": "Zmail v1.0", "Message-ID": "<20260407171052241tmZDFGusMP_wlEsBVVtJo@zte.com.cn>", "Date": "Tue, 7 Apr 2026 17:10:52 +0800 (CST)", "Mime-Version": "1.0", "From": "<wang.yechao255@zte.com.cn>", "To": "<anup@brainfault.org>, <atish.patra@linux.dev>, <pjw@kernel.org>,\n <palmer@dabbelt.com>, <aou@eecs.berkeley.edu>, <alex@ghiti.fr>", "Cc": "<kvm@vger.kernel.org>, <kvm-riscv@lists.infradead.org>,\n <linux-riscv@lists.infradead.org>, <linux-kernel@vger.kernel.org>", "Subject": "=?utf-8?q?=5BPATCH_0/3=5D_RISC-V=3A_KVM=3A_Huge_page_recovery_durin?=\n\t=?utf-8?q?g_disable-dirty-log?=", "X-MAIL": "mse-fl2.zte.com.cn 6379AjGQ039312", "X-TLS": "YES", "X-SPF-DOMAIN": "zte.com.cn", "X-ENVELOPE-SENDER": "wang.yechao255@zte.com.cn", "X-SPF": "None", "X-SOURCE-IP": "10.5.228.133 unknown Tue, 07 Apr 2026 17:11:00 +0800", "X-Fangmail-Anti-Spam-Filtered": "true", "X-Fangmail-MID-QID": "69D4CA24.001/4fqgR83lWwz501bP", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20260407_021113_738547_73F5F357 ", "X-CRM114-Status": "UNSURE ( 4.57 )", "X-CRM114-Notice": "Please train this message.", "X-Spam-Score": "-4.2 (----)", "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: Wang Yechao <wang.yechao255@zte.com.cn> When dirty\n logging\n is enabled,\n the gstage mappings are split into 4K pages to track dirty pages[1].\n If the migration fails or is canceled,\n in order to keep the VM's performance\n consistent with that be [...]\n Content analysis details: (-4.2 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 [183.62.165.209 listed in list.dnswl.org]\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 [183.62.165.209 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 [183.62.165.209 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 [183.62.165.209 listed in\n bl.score.senderscore.com]\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 -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\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: Wang Yechao <wang.yechao255@zte.com.cn>\n\nWhen dirty logging is enabled, the gstage mappings are split into\n4K pages to track dirty pages[1]. If the migration fails or is canceled,\nin order to keep the VM's performance consistent with that before\ndirty logging was enabled, It's need to recover the gstage huge page mappings\nwhen dirty logging is disabled.\n\nWith this series, dirty_log_perf_test shows a decrease in the number of\nvCPU faults:\n\n$ perf stat -e kvm:kvm_page_fault \\\n/dirty_log_perf_test -s anonymous_hugetlb_1gb -v 1 -e -b 1G\n\nBefore: 524,819 kvm:kvm_page_fault\nAfter : 263,211 kvm:kvm_page_fault\n\n[1].https://lore.kernel.org/linux-riscv/CAK9=C2Vb73snLT0uEY=5S5dQc6VXc_u4S60+9+sCLpyXZnHTWA@mail.gmail.com/T/#t\n\nWang Yechao (3):\n RISC-V: KVM: Refactor kvm_arch_commit_memory_region()\n RISC-V: KVM: add tracepoints for guest page faults\n RISC-V: KVM: Recover gstage huge page mappings during disable-dirty-log\n\n arch/riscv/include/asm/kvm_gstage.h | 4 ++\n arch/riscv/kvm/gstage.c | 42 +++++++++++++++++++\n arch/riscv/kvm/mmu.c | 63 ++++++++++++++++++++++++++++-\n arch/riscv/kvm/trace.h | 25 ++++++++++++\n arch/riscv/kvm/vcpu_exit.c | 3 ++\n 5 files changed, 136 insertions(+), 1 deletion(-)" }