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GET /api/patches/2225613/?format=api
{ "id": 2225613, "url": "http://patchwork.ozlabs.org/api/patches/2225613/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260421092457.37649-8-cuiyunhui@bytedance.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": "<20260421092457.37649-8-cuiyunhui@bytedance.com>", "list_archive_url": null, "date": "2026-04-21T09:24:57", "name": "[7/7] riscv: add Svnapot-aware pte_batch_hint support", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "bc606274a879386f74a60cccd62747eca811d813", "submitter": { "id": 88211, "url": "http://patchwork.ozlabs.org/api/people/88211/?format=api", "name": "Yunhui Cui", "email": "cuiyunhui@bytedance.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/kvm-riscv/patch/20260421092457.37649-8-cuiyunhui@bytedance.com/mbox/", "series": [ { "id": 500766, "url": "http://patchwork.ozlabs.org/api/series/500766/?format=api", "web_url": "http://patchwork.ozlabs.org/project/kvm-riscv/list/?series=500766", "date": "2026-04-21T09:24:50", "name": "riscv: add Svnapot-based contiguous PTE support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500766/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225613/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225613/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=QwyH4BCE;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=bytedance.com header.i=@bytedance.com\n header.a=rsa-sha256 header.s=google header.b=eNAzWiru;\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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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: Provide a Svnapot-specific pte_batch_hint() implementation\n so callers can batch over a contiguous napot range without re-reading each\n PTE entry. Keep the public wrapper in pgtable.h and leave the CONF [...]\n Content analysis details: (0.4 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [2607:f8b0:4864:20:0:0:0:102f listed in]\n [list.dnswl.org]\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 -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 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n 2.5 SORTED_RECIPS Recipient list is sorted by address", "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": "Provide a Svnapot-specific pte_batch_hint() implementation so callers can\nbatch over a contiguous napot range without re-reading each PTE entry.\nKeep the public wrapper in pgtable.h and leave the CONFIG-disabled case on\nthe existing single-entry fallback.\n\nSigned-off-by: Yunhui Cui <cuiyunhui@bytedance.com>\n---\n arch/riscv/include/asm/pgtable.h | 19 +++++++++++++++++-\n arch/riscv/mm/contpte.c | 33 ++++++++++++++++++++++++++++++++\n 2 files changed, 51 insertions(+), 1 deletion(-)", "diff": "diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h\nindex db82253efb218..264af77392c6e 100644\n--- a/arch/riscv/include/asm/pgtable.h\n+++ b/arch/riscv/include/asm/pgtable.h\n@@ -872,6 +872,13 @@ static inline bool __ptep_clear_flush_young(struct vm_area_struct *vma,\n \n #define __ptep_clear_flush_young __ptep_clear_flush_young\n \n+static inline unsigned int __pte_batch_hint(pte_t *ptep, pte_t pte)\n+{\n+\treturn 1;\n+}\n+\n+#define __pte_batch_hint __pte_batch_hint\n+\n #ifdef CONFIG_RISCV_ISA_SVNAPOT\n \n /*\n@@ -886,6 +893,7 @@ void __napotpte_try_unfold(struct mm_struct *mm, unsigned long addr,\n \t\t\t pte_t *ptep, pte_t pte);\n pte_t napotpte_ptep_get(pte_t *ptep, pte_t orig_pte);\n pte_t napotpte_ptep_get_lockless(pte_t *ptep);\n+unsigned int napotpte_pte_batch_hint(pte_t *ptep);\n void napotpte_set_ptes(struct mm_struct *mm, unsigned long addr,\n \t\t pte_t *ptep, pte_t pte, unsigned int nr);\n void napotpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr,\n@@ -1056,6 +1064,15 @@ static inline bool ptep_clear_flush_young(struct vm_area_struct *vma,\n \treturn napotpte_ptep_clear_flush_young(vma, address, ptep);\n }\n \n+#define pte_batch_hint pte_batch_hint\n+static inline unsigned int pte_batch_hint(pte_t *ptep, pte_t pte)\n+{\n+\tif (!pte_present(pte))\n+\t\treturn 1;\n+\n+\treturn napotpte_pte_batch_hint(ptep);\n+}\n+\n #else /* CONFIG_RISCV_ISA_SVNAPOT */\n \n static __always_inline bool riscv_pte_present_napot(pte_t pte)\n@@ -1100,9 +1117,9 @@ napotpte_ptep_clear_flush_young(struct vm_area_struct *vma,\n #define ptep_set_wrprotect\t\t\t__ptep_set_wrprotect\n #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH\n #define ptep_clear_flush_young\t\t\t__ptep_clear_flush_young\n+#define pte_batch_hint\t\t\t\t__pte_batch_hint\n \n #endif /* CONFIG_RISCV_ISA_SVNAPOT */\n-\n #define pgprot_nx pgprot_nx\n static inline pgprot_t pgprot_nx(pgprot_t _prot)\n {\ndiff --git a/arch/riscv/mm/contpte.c b/arch/riscv/mm/contpte.c\nindex 077ffa49e89d9..134b8c401cabc 100644\n--- a/arch/riscv/mm/contpte.c\n+++ b/arch/riscv/mm/contpte.c\n@@ -187,6 +187,12 @@ static inline bool napotpte_is_consistent(pte_t pte, pte_t orig_pte)\n \t pte_val(pte_mask_ad(pte)) == pte_val(pte_mask_ad(orig_pte));\n }\n \n+static inline bool napotpte_is_batch_consistent(pte_t pte, pte_t orig_pte)\n+{\n+\treturn pte_present_napot(pte) &&\n+\t pte_val(pte_mkold(pte)) == pte_val(pte_mkold(orig_pte));\n+}\n+\n void __napotpte_try_fold(struct mm_struct *mm, unsigned long addr,\n \t\t\t pte_t *ptep, pte_t pte)\n {\n@@ -391,6 +397,33 @@ pte_t napotpte_ptep_get_lockless(pte_t *orig_ptep)\n }\n EXPORT_SYMBOL(napotpte_ptep_get_lockless);\n \n+unsigned int napotpte_pte_batch_hint(pte_t *ptep)\n+{\n+\tpte_t orig_pte, pte;\n+\tpte_t *start;\n+\tunsigned int i, nr, off;\n+\n+\tif (!napot_hw_supported())\n+\t\treturn 1;\n+\n+\torig_pte = READ_ONCE(*ptep);\n+\tif (!pte_present_napot(orig_pte))\n+\t\treturn 1;\n+\n+\tstart = napot_align_ptep(ptep);\n+\tnr = napotpte_pte_num();\n+\toff = ptep - start;\n+\n+\tfor (i = off; i < nr; i++) {\n+\t\tpte = READ_ONCE(start[i]);\n+\t\tif (!napotpte_is_batch_consistent(pte, orig_pte))\n+\t\t\treturn 1;\n+\t}\n+\n+\treturn nr - off;\n+}\n+EXPORT_SYMBOL(napotpte_pte_batch_hint);\n+\n void napotpte_set_ptes(struct mm_struct *mm, unsigned long addr,\n \t\t pte_t *ptep, pte_t pte, unsigned int nr)\n {\n", "prefixes": [ "7/7" ] }