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GET /api/patches/2217957/?format=api
{ "id": 2217957, "url": "http://patchwork.ozlabs.org/api/patches/2217957/?format=api", "web_url": "http://patchwork.ozlabs.org/project/opensbi/patch/20260331055858.305207-4-dave.patel@riscstar.com/", "project": { "id": 67, "url": "http://patchwork.ozlabs.org/api/projects/67/?format=api", "name": "OpenSBI development", "link_name": "opensbi", "list_id": "opensbi.lists.infradead.org", "list_email": "opensbi@lists.infradead.org", "web_url": "https://github.com/riscv/opensbi", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "https://github.com/riscv/opensbi/commit/{}" }, "msgid": "<20260331055858.305207-4-dave.patel@riscstar.com>", "list_archive_url": null, "date": "2026-03-31T05:58:57", "name": "[v3,3/3] lib: sbi: domain FP/Vector context support for context switch", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "9fc9f9014894b8d6623be6318166f2ac87784c8a", "submitter": { "id": 92617, "url": "http://patchwork.ozlabs.org/api/people/92617/?format=api", "name": "Dave Patel", "email": "dave.patel@riscstar.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/opensbi/patch/20260331055858.305207-4-dave.patel@riscstar.com/mbox/", "series": [ { "id": 498123, "url": "http://patchwork.ozlabs.org/api/series/498123/?format=api", "web_url": "http://patchwork.ozlabs.org/project/opensbi/list/?series=498123", "date": "2026-03-31T05:58:55", "name": "Add eager FP and RISC-V vector context switching support", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/498123/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2217957/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2217957/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <opensbi-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=oWBvL3P2;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=riscstar-com.20230601.gappssmtp.com\n header.i=@riscstar-com.20230601.gappssmtp.com header.a=rsa-sha256\n header.s=20230601 header.b=QX48KUDe;\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: From: Dave Patel <dave.patel@riscstar.com> This patch adds\n proper support for per-domain floating-point (FP) and vector (V) contexts\n in the domain context switch logic. Each domain now maintains its own FP\n and vector state, which is saved and [...]\n Content analysis details: (-1.9 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 [2a00:1450:4864:20:0:0:0:336 listed in]\n [list.dnswl.org]\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 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]", "X-BeenThere": "opensbi@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<opensbi.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/opensbi>,\n <mailto:opensbi-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/opensbi/>", "List-Post": "<mailto:opensbi@lists.infradead.org>", "List-Help": "<mailto:opensbi-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/opensbi>,\n <mailto:opensbi-request@lists.infradead.org?subject=subscribe>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"opensbi\" <opensbi-bounces@lists.infradead.org>", "Errors-To": "opensbi-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "From: Dave Patel <dave.patel@riscstar.com>\n\nThis patch adds proper support for per-domain floating-point (FP) and\nvector (V) contexts in the domain context switch logic. Each domain\nnow maintains its own FP and vector state, which is saved and restored\nduring domain switches.\n\nChanges include:\n\n- Added `fp_ctx` and `vec_ctx` members to `struct sbi_domain`.\n- Introduced `sbi_vector_domain_init` for vlen check\n to allocate and free per-domain FP and vector context.\n- Modified `sbi_domain_register()` to initialize FP/Vector context per domain.\n- Updated `switch_to_next_domain_context()` to save/restore FP and vector\n contexts safely:\n - Ensures FS/VS fields in `mstatus` are enabled (set to Initial) only if Off.\n - Restores original FS/VS bits after context switch.\n - Adds NULL checks to handle domains without FP or Vector extensions.\n- Updated domain context deinit to free FP and vector contexts per domain.\n- Added runtime checks for FP and vector extensions where needed.\n- Corrected handling of MSTATUS FS/VS bits to avoid unsafe full-bit writes.\n\nThis improves support for multi-domain systems with FP and Vector\nextensions, and prevents corruption of FP/Vector state during domain\nswitches.\n\nSigned-off-by: Dave Patel <dave.patel@riscstar.com>\n---\n include/sbi/sbi_domain.h | 6 +++++\n include/sbi/sbi_fp.h | 13 +----------\n include/sbi/sbi_vector.h | 4 ++++\n lib/sbi/sbi_domain.c | 6 +++++\n lib/sbi/sbi_domain_context.c | 12 ++++++++++\n lib/sbi/sbi_fp.c | 6 +++++\n lib/sbi/sbi_vector.c | 43 ++++++++++++++++++++++++++----------\n 7 files changed, 66 insertions(+), 24 deletions(-)\n\n--\n2.43.0", "diff": "diff --git a/include/sbi/sbi_domain.h b/include/sbi/sbi_domain.h\nindex 882b62c2..318d3a9a 100644\n--- a/include/sbi/sbi_domain.h\n+++ b/include/sbi/sbi_domain.h\n@@ -16,6 +16,8 @@\n #include <sbi/sbi_hartmask.h>\n #include <sbi/sbi_domain_context.h>\n #include <sbi/sbi_domain_data.h>\n+#include <sbi/sbi_vector.h>\n+#include <sbi/sbi_fp.h>\n\n struct sbi_scratch;\n\n@@ -217,6 +219,10 @@ struct sbi_domain {\n \tbool fw_region_inited;\n \t/** per-domain wired-IRQ courier state */\n \tvoid *virq_priv;\n+\t/** per-domain float context state */\n+\tstruct sbi_fp_context fp_ctx;\n+\t/** per-domain vector context state */\n+\tstruct sbi_vector_context vec_ctx;\n };\n\n /** The root domain instance */\ndiff --git a/include/sbi/sbi_fp.h b/include/sbi/sbi_fp.h\nindex 8079bb3b..962150a3 100644\n--- a/include/sbi/sbi_fp.h\n+++ b/include/sbi/sbi_fp.h\n@@ -8,13 +8,8 @@\n #ifndef __SBI_FP_H__\n #define __SBI_FP_H__\n\n-#include <sbi/riscv_encoding.h>\n #include <sbi/sbi_types.h>\n\n-#if defined(__riscv_f) || defined(__riscv_d)\n-\n-#include <stdint.h>\n-\n struct sbi_fp_context {\n #if __riscv_d\n \tuint64_t f[32];\n@@ -22,13 +17,7 @@ struct sbi_fp_context {\n \tuint32_t f[32];\n #endif\n \tuint32_t fcsr;\n-} __aligned(16);\n-\n-#else /* No FP (e.g., Zve32x) */\n-\n-struct sbi_fp_context { };\n-\n-#endif //defined(__riscv_f) || defined(__riscv_d)\n+};\n\n void sbi_fp_save(struct sbi_fp_context *dst);\n void sbi_fp_restore(const struct sbi_fp_context *src);\ndiff --git a/include/sbi/sbi_vector.h b/include/sbi/sbi_vector.h\nindex 4ecfaa0b..9ae76b00 100644\n--- a/include/sbi/sbi_vector.h\n+++ b/include/sbi/sbi_vector.h\n@@ -10,6 +10,9 @@\n #define __SBI_VECTOR_H__\n\n #include <sbi/sbi_types.h>\n+#include <sbi/sbi_domain.h>\n+#include <sbi/sbi_error.h>\n+#include <sbi/sbi_console.h>\n\n #define SBI_MAX_VLENB CONFIG_SBI_MAX_VLENB\n\n@@ -25,6 +28,7 @@ struct sbi_vector_context {\n\n void sbi_vector_save(struct sbi_vector_context *dst);\n void sbi_vector_restore(const struct sbi_vector_context *src);\n+int sbi_vector_domain_init(void);\n\n #endif //__SBI_VECTOR_H__\n\ndiff --git a/lib/sbi/sbi_domain.c b/lib/sbi/sbi_domain.c\nindex 498a1d56..424204eb 100644\n--- a/lib/sbi/sbi_domain.c\n+++ b/lib/sbi/sbi_domain.c\n@@ -19,6 +19,8 @@\n #include <sbi/sbi_scratch.h>\n #include <sbi/sbi_string.h>\n #include <sbi/sbi_virq.h>\n+#include <sbi/sbi_vector.h>\n+#include <sbi/sbi_fp.h>\n\n SBI_LIST_HEAD(domain_list);\n\n@@ -1007,6 +1009,10 @@ int sbi_domain_init(struct sbi_scratch *scratch, u32 cold_hartid)\n \tif (rc)\n \t\tgoto fail_free_root_hmask;\n\n+\trc = sbi_vector_domain_init();\n+\tif (rc)\n+\t\tgoto fail_free_root_hmask;\n+\n \treturn 0;\n\n fail_free_root_hmask:\ndiff --git a/lib/sbi/sbi_domain_context.c b/lib/sbi/sbi_domain_context.c\nindex 158f4990..f646c7d4 100644\n--- a/lib/sbi/sbi_domain_context.c\n+++ b/lib/sbi/sbi_domain_context.c\n@@ -18,6 +18,9 @@\n #include <sbi/sbi_domain_context.h>\n #include <sbi/sbi_platform.h>\n #include <sbi/sbi_trap.h>\n+#include <sbi/sbi_vector.h>\n+#include <sbi/sbi_fp.h>\n+\n\n /** Context representation for a hart within a domain */\n struct hart_context {\n@@ -143,6 +146,15 @@ static int switch_to_next_domain_context(struct hart_context *ctx,\n \tif (sbi_hart_has_extension(scratch, SBI_HART_EXT_SSQOSID))\n \t\tctx->srmcfg\t= csr_swap(CSR_SRMCFG, dom_ctx->srmcfg);\n\n+\t/* Make sure FS and VS is on before context switch */\n+\tcsr_set(CSR_MSTATUS, MSTATUS_FS | MSTATUS_VS);\n+\n+\t/* Eager context switch F and V */\n+\tsbi_fp_save(¤t_dom->fp_ctx);\n+\tsbi_fp_restore(&target_dom->fp_ctx);\n+\tsbi_vector_save(¤t_dom->vec_ctx);\n+\tsbi_vector_restore(&target_dom->vec_ctx);\n+\n \t/* Save current trap state and restore target domain's trap state */\n \ttrap_ctx = sbi_trap_get_context(scratch);\n \tsbi_memcpy(&ctx->trap_ctx, trap_ctx, sizeof(*trap_ctx));\ndiff --git a/lib/sbi/sbi_fp.c b/lib/sbi/sbi_fp.c\nindex 5d72b72e..9772d359 100644\n--- a/lib/sbi/sbi_fp.c\n+++ b/lib/sbi/sbi_fp.c\n@@ -7,8 +7,11 @@\n */\n\n #include <sbi/riscv_asm.h>\n+#include <sbi/sbi_heap.h>\n #include <sbi/riscv_encoding.h>\n #include <sbi/sbi_fp.h>\n+#include <sbi/sbi_error.h>\n+#include <sbi/sbi_console.h>\n\n #if defined(__riscv_f) || defined(__riscv_d)\n\n@@ -185,7 +188,10 @@ void sbi_fp_restore(const struct sbi_fp_context *src)\n\n \tcsr_write(CSR_FCSR, src->fcsr);\n }\n+\n #else\n+\n void sbi_fp_save(struct sbi_fp_context *dst) {}\n void sbi_fp_restore(const struct sbi_fp_context *src) {}\n+\n #endif // FP present\ndiff --git a/lib/sbi/sbi_vector.c b/lib/sbi/sbi_vector.c\nindex 5a3f34d7..5877c373 100644\n--- a/lib/sbi/sbi_vector.c\n+++ b/lib/sbi/sbi_vector.c\n@@ -12,21 +12,23 @@\n #include <sbi/sbi_vector.h>\n #include <sbi/sbi_types.h>\n #include <sbi/sbi_hart.h>\n+#include <sbi/sbi_heap.h>\n\n #ifdef OPENSBI_CC_SUPPORT_VECTOR\n+#define VLEN_MAX 65536\n\n static inline void vsetvl(ulong vl, ulong vtype)\n {\n- ulong tmp;\n-\n- asm volatile(\n-\t\".option push\\n\\t\"\n-\t\".option arch, +v\\n\\t\"\n-\t\"vsetvl %0, %1, %2\\n\\t\"\n-\t\".option pop\\n\\t\"\n-\t: \"=r\"(tmp)\n-\t: \"r\"(vl), \"r\"(vtype)\n-\t: \"memory\");\n+\tulong tmp;\n+\n+\tasm volatile(\n+\t\t\".option push\\n\\t\"\n+\t\t\".option arch, +v\\n\\t\"\n+\t\t\"vsetvl %0, %1, %2\\n\\t\"\n+\t\t\".option pop\\n\\t\"\n+\t\t: \"=r\"(tmp)\n+\t\t: \"r\"(vl), \"r\"(vtype)\n+\t\t: \"memory\");\n }\n\n static inline unsigned long vector_vlenb(void)\n@@ -64,7 +66,7 @@ void sbi_vector_save(struct sbi_vector_context *dst)\n\n \t/* Step 1: Save CSRs */\n \tREAD_CSR(dst->vtype, vtype);\n-\tREAD_CSR(dst->vl, vl);\n+\tREAD_CSR(dst->vl,\t vl);\n \tREAD_CSR(dst->vcsr, vcsr);\n \tREAD_CSR(dst->vstart, vstart);\n\n@@ -194,12 +196,24 @@ void sbi_vector_restore(const struct sbi_vector_context *src)\n\n \t/* Restore CSRs first */\n \tWRITE_CSR(vtype, src->vtype);\n-\tWRITE_CSR(vl, src->vl);\n+\tWRITE_CSR(vl,\t src->vl);\n \tWRITE_CSR(vcsr, src->vcsr);\n \tWRITE_CSR(vstart, src->vstart);\n #undef WRITE_CSR\n }\n\n+int sbi_vector_domain_init(void)\n+{\n+\tulong vlenb = vector_vlenb();\n+\n+\tif (vlenb > SBI_MAX_VLENB) {\n+\t\tsbi_printf(\"[Vector ERR:] vlenb range error\\n\");\n+\t\treturn SBI_ERR_BAD_RANGE;\n+\t}\n+\n+\treturn SBI_OK;\n+}\n+\n #else\n\n void sbi_vector_save(struct sbi_vector_context *dst)\n@@ -212,4 +226,9 @@ void sbi_vector_restore(const struct sbi_vector_context *src)\n \treturn;\n }\n\n+int sbi_vector_domain_init(void)\n+{\n+\treturn SBI_OK;\n+\n #endif /* OPENSBI_CC_SUPPORT_VECTOR */\n+\n", "prefixes": [ "v3", "3/3" ] }