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b=R3Y8SQfRTlNH8VNjVUE6erUXF3aq7xbmPi9wmva4X7wZQ5e92onN/AE9P9J3hgs/CrD7OnjBVrVvx5fEdIU8NPiDFTJGTPOJSHcoo2LQgbpuLsF3n8wZapzqmEPlkYtvl1MIlF0KqCQ5yIsFe03o7yrEg3gupOTr49e5/R5Z7zjP4+DEf9XZuQihFtF0OgmC4k4BmScjg33mT65el0vdI0RlKED5HCZgO3tkZ0Sr7n7qHoQCudB8o1edcgG1Czy5lkJ6jHFoL1wH2YqKO3bdfSX1cDKdyx7EcxbJVZ0AXBTEHZDpLxtMD5AIaRsSn8Ch7of6jeUiiRBBUvl46X5aZg== From: Djordje Todorovic To: "qemu-devel@nongnu.org" CC: "qemu-riscv@nongnu.org" , "cfu@mips.com" , "mst@redhat.com" , "marcel.apfelbaum@gmail.com" , "dbarboza@ventanamicro.com" , "philmd@linaro.org" , "alistair23@gmail.com" , "thuth@redhat.com" , Djordje Todorovic Subject: [PATCH v4 1/7] target/riscv: Define MSTATUS_SBE and MSTATUS_MBE bit masks Thread-Topic: [PATCH v4 1/7] target/riscv: Define MSTATUS_SBE and MSTATUS_MBE bit masks Thread-Index: AQHcuHsOfwwXmhr8UUqIhRcaFi4v+g== Date: Fri, 20 Mar 2026 15:05:58 +0000 Message-ID: <20260320150552.169480-2-djordje.todorovic@htecgroup.com> References: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> In-Reply-To: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=htecgroup.com; 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envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019276708154100 Add the RISC-V privileged ISA defined bit positions for the Supervisor Big-Endian (SBE, bit 36) and Machine Big-Endian (MBE, bit 37) fields in the mstatus register. These are used alongside the existing MSTATUS_UBE (bit 6) to control data endianness at each privilege level. The MSTATUS_UBE definition was already present, but SBE and MBE were missing. Signed-off-by: Djordje Todorovic Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- target/riscv/cpu_bits.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h index b62dd82fe7..c2a3ee4bf3 100644 --- a/target/riscv/cpu_bits.h +++ b/target/riscv/cpu_bits.h @@ -628,6 +628,8 @@ #define MSTATUS_TSR 0x00400000 /* since: priv-1.10 */ #define MSTATUS_SPELP 0x00800000 /* zicfilp */ #define MSTATUS_SDT 0x01000000 +#define MSTATUS_SBE 0x1000000000ULL +#define MSTATUS_MBE 0x2000000000ULL #define MSTATUS_MPELP 0x020000000000 /* zicfilp */ #define MSTATUS_GVA 0x4000000000ULL #define MSTATUS_MPV 0x8000000000ULL --=20 2.34.1 From nobody Sun Mar 22 14:18:59 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=htecgroup.com); dmarc=pass(p=reject dis=none) header.from=htecgroup.com ARC-Seal: i=2; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019221740154100 Content-Type: text/plain; charset="utf-8" Add a "big-endian" boolean property to the RISC-V CPU configuration, defaulting to false (little-endian). This property allows machine models to configure individual HARTs for big-endian data operation. The RISC-V ISA supports big-endian data accesses via the mstatus SBE/MBE/UBE bits, while instructions remain always little-endian. This property provides the configuration interface; subsequent patches will connect it to the CPU state and translation logic. Signed-off-by: Djordje Todorovic --- target/riscv/cpu.c | 1 + target/riscv/cpu_cfg_fields.h.inc | 1 + 2 files changed, 2 insertions(+) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index e56470a374..4537305dfe 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -2641,6 +2641,7 @@ RISCVCPUImpliedExtsRule *riscv_multi_ext_implied_rule= s[] =3D { =20 static const Property riscv_cpu_properties[] =3D { DEFINE_PROP_BOOL("debug", RISCVCPU, cfg.debug, true), + DEFINE_PROP_BOOL("big-endian", RISCVCPU, cfg.big_endian, false), =20 {.name =3D "pmu-mask", .info =3D &prop_pmu_mask}, {.name =3D "pmu-num", .info =3D &prop_pmu_num}, /* Deprecated */ diff --git a/target/riscv/cpu_cfg_fields.h.inc b/target/riscv/cpu_cfg_field= s.h.inc index 70ec650abf..51436daabf 100644 --- a/target/riscv/cpu_cfg_fields.h.inc +++ b/target/riscv/cpu_cfg_fields.h.inc @@ -154,6 +154,7 @@ BOOL_FIELD(ext_xmipscbop) BOOL_FIELD(ext_xmipscmov) BOOL_FIELD(ext_xmipslsp) =20 +BOOL_FIELD(big_endian) BOOL_FIELD(mmu) BOOL_FIELD(pmp) BOOL_FIELD(debug) --=20 2.34.1 From nobody Sun Mar 22 14:18:59 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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b=dx9x4NmR4PLTBP0C2wz8YLx2Nk6PwOY6sL235tSOTPP/nd6cHb95lELvEkDgGLSp8e1GRHyyDrUjytEhk4zQLbuduLUVXdaA/YI4zGQ9616RBkovzGeUzoHhg5zAg+h5/jTod+lVp4xTFNhNAJyENXNE8Okvc/GtKjy8v+ROs5CUUGu6WEEBDg+QUQx2yQ3wZQFTG3IqqdkGV+6fAKZ4rs6k+oKzCcMP5tfj3jHJtJa3hHQb9nbHybLzDeyCc/3mcNk6VOZuIDKQEL7M4246LtEF2AqUVC5HyNBm4qIsZ6ei/wZuRuUVm23WakKO37MYOfekMLwiH5ED4IK4iLahNA== From: Djordje Todorovic To: "qemu-devel@nongnu.org" CC: "qemu-riscv@nongnu.org" , "cfu@mips.com" , "mst@redhat.com" , "marcel.apfelbaum@gmail.com" , "dbarboza@ventanamicro.com" , "philmd@linaro.org" , "alistair23@gmail.com" , "thuth@redhat.com" , Djordje Todorovic Subject: [PATCH v4 3/7] target/riscv: Set endianness MSTATUS bits at CPU reset Thread-Topic: [PATCH v4 3/7] target/riscv: Set endianness MSTATUS bits at CPU reset Thread-Index: AQHcuHsPNGAOt5LLwU2Y4KNNqM1iUQ== Date: Fri, 20 Mar 2026 15:05:59 +0000 Message-ID: <20260320150552.169480-4-djordje.todorovic@htecgroup.com> References: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> In-Reply-To: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=htecgroup.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019223875154100 Content-Type: text/plain; charset="utf-8" When the big-endian CPU property is enabled, set the MSTATUS_UBE (User Big-Endian), MSTATUS_SBE (Supervisor Big-Endian), and MSTATUS_MBE (Machine Big-Endian) bits during CPU reset. This configures all privilege levels for big-endian data access, matching the RISC-V privileged specification's endianness control mechanism. Instructions remain little-endian regardless. Also update the disassembler comment to clarify that BFD_ENDIAN_LITTLE is correct because RISC-V instructions are always little-endian per the ISA specification. Signed-off-by: Djordje Todorovic --- target/riscv/cpu.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 4537305dfe..eed5afd27e 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -716,6 +716,9 @@ static void riscv_cpu_reset_hold(Object *obj, ResetType= type) env->mstatus =3D set_field(env->mstatus, MSTATUS_MDT, 1); } } + if (cpu->cfg.big_endian) { + env->mstatus |=3D MSTATUS_UBE | MSTATUS_SBE | MSTATUS_MBE; + } env->mcause =3D 0; env->miclaim =3D MIP_SGEIP; env->pc =3D env->resetvec; @@ -803,11 +806,8 @@ static void riscv_cpu_disas_set_info(const CPUState *s= , disassemble_info *info) info->target_info =3D &cpu->cfg; =20 /* - * A couple of bits in MSTATUS set the endianness: - * - MSTATUS_UBE (User-mode), - * - MSTATUS_SBE (Supervisor-mode), - * - MSTATUS_MBE (Machine-mode) - * but we don't implement that yet. + * RISC-V instructions are always little-endian, regardless of the + * data endianness configured via MSTATUS UBE/SBE/MBE bits. */ info->endian =3D BFD_ENDIAN_LITTLE; 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b=gI49sYV1fLl8kOi7S9QkBEcW1S9lip6rQv6WaJ7LWyTNGSWKRud8IWbX6v4Wuc/DJQ5Dtk53tVYcmrM2GAG6hWSsCiqw8fwy5ggDsx3cCcMqx+FuA5drPApBbEPvZBagF3cRcWkly3IBy3tzcddwYN7nhxXZ+5poMpPQVZuOaDKAEs9UVmQ7VdLaHgd8bVVgfTVMbknCV9pCkQmv3t3JqF5m7dPBWr6jab8I+eutEq8uzmYemD67ecqX+qfSfxWHMvfWDt9cKpIjwSXx/DhRU1kBmJUI30qRMAVynU9GstwzqI3PJovlyQ6OvFRjfm8uPF/sRY/wt3wrJtRF+BwpCg== From: Djordje Todorovic To: "qemu-devel@nongnu.org" CC: "qemu-riscv@nongnu.org" , "cfu@mips.com" , "mst@redhat.com" , "marcel.apfelbaum@gmail.com" , "dbarboza@ventanamicro.com" , "philmd@linaro.org" , "alistair23@gmail.com" , "thuth@redhat.com" , Djordje Todorovic Subject: [PATCH v4 4/7] target/riscv: Implement runtime data endianness via MSTATUS bits Thread-Topic: [PATCH v4 4/7] target/riscv: Implement runtime data endianness via MSTATUS bits Thread-Index: AQHcuHsPQnT8IFQqVU2ayD/d0a/CQw== Date: Fri, 20 Mar 2026 15:06:00 +0000 Message-ID: <20260320150552.169480-5-djordje.todorovic@htecgroup.com> References: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> In-Reply-To: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=htecgroup.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019223939158500 Content-Type: text/plain; charset="utf-8" Implement runtime big-endian data support by reading the MSTATUS UBE/SBE/MBE bits to determine data endianness per privilege level. The key changes are: - Add riscv_cpu_data_is_big_endian() helper in cpu.h that checks the appropriate MSTATUS endianness bit based on current privilege level (MBE for M-mode, SBE for S-mode, UBE for U-mode). - Update mo_endian() in translate.c to return MO_BE or MO_LE based on a new 'big_endian' field in DisasContext, rather than the previous hardcoded MO_TE. - Update mo_endian_env() in op_helper.c to call the new helper, giving hypervisor load/store helpers correct runtime endianness. - Pack the endianness flag into cs_base bit 32 (alongside misa_ext in bits 0-25) in riscv_get_tb_cpu_state(), ensuring translation blocks are correctly separated by data endianness. Note: instruction fetches continue to use MO_LE unconditionally (from the previous patch), as RISC-V instructions are always little-endian per the ISA specification. Signed-off-by: Djordje Todorovic --- target/riscv/cpu.h | 28 ++++++++++++++++++++++++++++ target/riscv/internals.h | 9 +-------- target/riscv/tcg/tcg-cpu.c | 9 ++++++++- target/riscv/translate.c | 12 ++++-------- 4 files changed, 41 insertions(+), 17 deletions(-) diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h index 35d1f6362c..ef870d05b3 100644 --- a/target/riscv/cpu.h +++ b/target/riscv/cpu.h @@ -703,6 +703,12 @@ FIELD(TB_FLAGS, BCFI_ENABLED, 28, 1) FIELD(TB_FLAGS, PM_PMM, 29, 2) FIELD(TB_FLAGS, PM_SIGNEXTEND, 31, 1) =20 +/* + * cs_base carries misa_ext (bits 0-25) plus additional flags. + * Bit 32 is used for data endianness since TB_FLAGS has no free bits. + */ +#define TB_CSBASE_BIG_ENDIAN (1ULL << 32) + #ifdef TARGET_RISCV32 #define riscv_cpu_mxl(env) ((void)(env), MXL_RV32) #else @@ -718,6 +724,28 @@ static inline const RISCVCPUConfig *riscv_cpu_cfg(CPUR= ISCVState *env) return &env_archcpu(env)->cfg; } =20 +/* + * Return true if data accesses are big-endian for the current privilege + * level, based on the MSTATUS MBE/SBE/UBE bits. + */ +static inline bool riscv_cpu_data_is_big_endian(CPURISCVState *env) +{ +#if defined(CONFIG_USER_ONLY) + return false; +#else + switch (env->priv) { + case PRV_M: + return env->mstatus & MSTATUS_MBE; + case PRV_S: + return env->mstatus & MSTATUS_SBE; + case PRV_U: + return env->mstatus & MSTATUS_UBE; + default: + g_assert_not_reached(); + } +#endif +} + #if !defined(CONFIG_USER_ONLY) static inline int cpu_address_mode(CPURISCVState *env) { diff --git a/target/riscv/internals.h b/target/riscv/internals.h index 460346dd6d..e2f0334da8 100644 --- a/target/riscv/internals.h +++ b/target/riscv/internals.h @@ -64,14 +64,7 @@ static inline bool mmuidx_2stage(int mmu_idx) =20 static inline MemOp mo_endian_env(CPURISCVState *env) { - /* - * A couple of bits in MSTATUS set the endianness: - * - MSTATUS_UBE (User-mode), - * - MSTATUS_SBE (Supervisor-mode), - * - MSTATUS_MBE (Machine-mode) - * but we don't implement that yet. - */ - return MO_LE; + return riscv_cpu_data_is_big_endian(env) ? MO_BE : MO_LE; } =20 /* share data between vector helpers and decode code */ diff --git a/target/riscv/tcg/tcg-cpu.c b/target/riscv/tcg/tcg-cpu.c index 3407191c22..fa42197e98 100644 --- a/target/riscv/tcg/tcg-cpu.c +++ b/target/riscv/tcg/tcg-cpu.c @@ -189,10 +189,17 @@ static TCGTBCPUState riscv_get_tb_cpu_state(CPUState = *cs) flags =3D FIELD_DP32(flags, TB_FLAGS, PM_PMM, riscv_pm_get_pmm(env)); flags =3D FIELD_DP32(flags, TB_FLAGS, PM_SIGNEXTEND, pm_signext); =20 + uint64_t cs_base =3D env->misa_ext; +#ifndef CONFIG_USER_ONLY + if (riscv_cpu_data_is_big_endian(env)) { + cs_base |=3D TB_CSBASE_BIG_ENDIAN; + } +#endif + return (TCGTBCPUState){ .pc =3D env->xl =3D=3D MXL_RV32 ? env->pc & UINT32_MAX : env->pc, .flags =3D flags, - .cs_base =3D env->misa_ext, + .cs_base =3D cs_base, }; } =20 diff --git a/target/riscv/translate.c b/target/riscv/translate.c index 5df5b73849..d7f1f8e466 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -119,6 +119,8 @@ typedef struct DisasContext { bool fcfi_lp_expected; /* zicfiss extension, if shadow stack was enabled during TB gen */ bool bcfi_enabled; + /* Data endianness from MSTATUS UBE/SBE/MBE */ + bool big_endian; } DisasContext; =20 static inline bool has_ext(DisasContext *ctx, uint32_t ext) @@ -128,14 +130,7 @@ static inline bool has_ext(DisasContext *ctx, uint32_t= ext) =20 static inline MemOp mo_endian(DisasContext *ctx) { - /* - * A couple of bits in MSTATUS set the endianness: - * - MSTATUS_UBE (User-mode), - * - MSTATUS_SBE (Supervisor-mode), - * - MSTATUS_MBE (Machine-mode) - * but we don't implement that yet. - */ - return MO_LE; + return ctx->big_endian ? MO_BE : MO_LE; } =20 #ifdef TARGET_RISCV32 @@ -1346,6 +1341,7 @@ static void riscv_tr_init_disas_context(DisasContextB= ase *dcbase, CPUState *cs) ctx->zero =3D tcg_constant_tl(0); ctx->virt_inst_excp =3D false; ctx->decoders =3D cpu->decoders; + ctx->big_endian =3D ctx->base.tb->cs_base & TB_CSBASE_BIG_ENDIAN; } =20 static void riscv_tr_tb_start(DisasContextBase *db, CPUState *cpu) --=20 2.34.1 From nobody Sun Mar 22 14:18:59 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=htecgroup.com); dmarc=pass(p=reject dis=none) header.from=htecgroup.com ARC-Seal: i=2; a=rsa-sha256; t=1774019261; cv=pass; d=zohomail.com; s=zohoarc; b=EL5l9auxNI6YFxXFoeXSg/OfG86UBDLOeC5cvrAXwH+qYzMXVS+fgHnU9COVkeH7KJLhU3Y4mmLgxhtHa6Ytl1ZVFx2X28Ln1pO1VMbjJ2kQ2qjhP21KsWdtRPWl8KY3UweiCPrE0Ldm7wx9iFnX7p5HQpAWGhfMF/y7fSCS8Ss= ARC-Message-Signature: i=2; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019262060158501 Content-Type: text/plain; charset="utf-8" Add riscv_is_big_endian() helper that checks the hart's big-endian CPU property and use it throughout the boot code: - ELF loading: pass ELFDATA2MSB or ELFDATA2LSB based on endianness - Firmware dynamic info: use cpu_to_be* or cpu_to_le* based on endianness - Reset vector: instructions (entries 0-5) remain always little-endian, data words (entries 6-9) use target data endianness. For RV64 BE, the hi/lo word pairs within each dword are swapped since LD reads as BE. This is part of the runtime big-endian support series which avoids separate BE binaries by handling endianness as a CPU property. Signed-off-by: Djordje Todorovic --- hw/riscv/boot.c | 83 +++++++++++++++++++++++++++++++++++------ include/hw/riscv/boot.h | 2 + 2 files changed, 73 insertions(+), 12 deletions(-) diff --git a/hw/riscv/boot.c b/hw/riscv/boot.c index e5490beda0..fdff2a7ddd 100644 --- a/hw/riscv/boot.c +++ b/hw/riscv/boot.c @@ -40,6 +40,28 @@ bool riscv_is_32bit(RISCVHartArrayState *harts) return mcc->def->misa_mxl_max =3D=3D MXL_RV32; } =20 +bool riscv_is_big_endian(RISCVHartArrayState *harts) +{ + return harts->harts[0].cfg.big_endian; +} + +/* + * Convert a pair of 32-bit words forming a 64-bit dword to target data + * endianness. For big-endian, the hi/lo word order is swapped since LD + * interprets bytes as BE. + */ +static void riscv_boot_data_dword(uint32_t *data, bool big_endian) +{ + if (big_endian) { + uint32_t tmp =3D data[0]; + data[0] =3D cpu_to_be32(data[1]); + data[1] =3D cpu_to_be32(tmp); + } else { + data[0] =3D cpu_to_le32(data[0]); + data[1] =3D cpu_to_le32(data[1]); + } +} + /* * Return the per-socket PLIC hart topology configuration string * (caller must free with g_free()) @@ -72,6 +94,7 @@ void riscv_boot_info_init(RISCVBootInfo *info, RISCVHartA= rrayState *harts) info->kernel_size =3D 0; info->initrd_size =3D 0; info->is_32bit =3D riscv_is_32bit(harts); + info->is_big_endian =3D riscv_is_big_endian(harts); } =20 vaddr riscv_calc_kernel_start_addr(RISCVBootInfo *info, @@ -247,8 +270,10 @@ void riscv_load_kernel(MachineState *machine, */ kernel_size =3D load_elf_ram_sym(kernel_filename, NULL, NULL, NULL, NU= LL, &info->image_low_addr, &info->image_hig= h_addr, - NULL, ELFDATA2LSB, EM_RISCV, - 1, 0, NULL, true, sym_cb); + NULL, + info->is_big_endian ? ELFDATA2MSB + : ELFDATA2LSB, + EM_RISCV, 1, 0, NULL, true, sym_cb); if (kernel_size > 0) { info->kernel_size =3D kernel_size; goto out; @@ -391,21 +416,32 @@ void riscv_rom_copy_firmware_info(MachineState *machi= ne, struct fw_dynamic_info64 dinfo64; void *dinfo_ptr =3D NULL; size_t dinfo_len; + bool big_endian =3D riscv_is_big_endian(harts); =20 if (riscv_is_32bit(harts)) { - dinfo32.magic =3D cpu_to_le32(FW_DYNAMIC_INFO_MAGIC_VALUE); - dinfo32.version =3D cpu_to_le32(FW_DYNAMIC_INFO_VERSION); - dinfo32.next_mode =3D cpu_to_le32(FW_DYNAMIC_INFO_NEXT_MODE_S); - dinfo32.next_addr =3D cpu_to_le32(kernel_entry); + dinfo32.magic =3D big_endian ? cpu_to_be32(FW_DYNAMIC_INFO_MAGIC_V= ALUE) + : cpu_to_le32(FW_DYNAMIC_INFO_MAGIC_VAL= UE); + dinfo32.version =3D big_endian ? cpu_to_be32(FW_DYNAMIC_INFO_VERSI= ON) + : cpu_to_le32(FW_DYNAMIC_INFO_VERSION= ); + dinfo32.next_mode =3D big_endian + ? cpu_to_be32(FW_DYNAMIC_INFO_NEXT_MODE_S) + : cpu_to_le32(FW_DYNAMIC_INFO_NEXT_MODE_S); + dinfo32.next_addr =3D big_endian ? cpu_to_be32(kernel_entry) + : cpu_to_le32(kernel_entry); dinfo32.options =3D 0; dinfo32.boot_hart =3D 0; dinfo_ptr =3D &dinfo32; dinfo_len =3D sizeof(dinfo32); } else { - dinfo64.magic =3D cpu_to_le64(FW_DYNAMIC_INFO_MAGIC_VALUE); - dinfo64.version =3D cpu_to_le64(FW_DYNAMIC_INFO_VERSION); - dinfo64.next_mode =3D cpu_to_le64(FW_DYNAMIC_INFO_NEXT_MODE_S); - dinfo64.next_addr =3D cpu_to_le64(kernel_entry); + dinfo64.magic =3D big_endian ? cpu_to_be64(FW_DYNAMIC_INFO_MAGIC_V= ALUE) + : cpu_to_le64(FW_DYNAMIC_INFO_MAGIC_VAL= UE); + dinfo64.version =3D big_endian ? cpu_to_be64(FW_DYNAMIC_INFO_VERSI= ON) + : cpu_to_le64(FW_DYNAMIC_INFO_VERSION= ); + dinfo64.next_mode =3D big_endian + ? cpu_to_be64(FW_DYNAMIC_INFO_NEXT_MODE_S) + : cpu_to_le64(FW_DYNAMIC_INFO_NEXT_MODE_S); + dinfo64.next_addr =3D big_endian ? cpu_to_be64(kernel_entry) + : cpu_to_le64(kernel_entry); dinfo64.options =3D 0; dinfo64.boot_hart =3D 0; dinfo_ptr =3D &dinfo64; @@ -474,10 +510,33 @@ void riscv_setup_rom_reset_vec(MachineState *machine,= RISCVHartArrayState *harts reset_vec[2] =3D 0x00000013; /* addi x0, x0, 0 */ } =20 - /* copy in the reset vector in little_endian byte order */ - for (i =3D 0; i < ARRAY_SIZE(reset_vec); i++) { + /* RISC-V instructions are always little-endian */ + for (i =3D 0; i < 6; i++) { reset_vec[i] =3D cpu_to_le32(reset_vec[i]); } + + /* + * Data words (addresses at entries 6-9) must match the firmware's data + * endianness. + */ + if (riscv_is_32bit(harts)) { + for (i =3D 6; i < ARRAY_SIZE(reset_vec); i++) { + if (riscv_is_big_endian(harts)) { + reset_vec[i] =3D cpu_to_be32(reset_vec[i]); + } else { + reset_vec[i] =3D cpu_to_le32(reset_vec[i]); + } + } + } else { + /* + * For RV64, each pair of 32-bit words forms a dword. For big-endi= an, + * the hi/lo word order within each dword must be swapped since LD + * interprets bytes as BE. + */ + for (i =3D 6; i < ARRAY_SIZE(reset_vec); i +=3D 2) { + riscv_boot_data_dword(reset_vec + i, riscv_is_big_endian(harts= )); + } + } rom_add_blob_fixed_as("mrom.reset", reset_vec, sizeof(reset_vec), rom_base, &address_space_memory); riscv_rom_copy_firmware_info(machine, harts, diff --git a/include/hw/riscv/boot.h b/include/hw/riscv/boot.h index f00b3ca122..a54c2b397d 100644 --- a/include/hw/riscv/boot.h +++ b/include/hw/riscv/boot.h @@ -36,9 +36,11 @@ typedef struct RISCVBootInfo { ssize_t initrd_size; =20 bool is_32bit; + bool is_big_endian; } RISCVBootInfo; =20 bool riscv_is_32bit(RISCVHartArrayState *harts); +bool riscv_is_big_endian(RISCVHartArrayState *harts); =20 char *riscv_plic_hart_config_string(int hart_count); =20 --=20 2.34.1 From nobody Sun Mar 22 14:18:59 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; 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charset="utf-8" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: htecgroup.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: GV2PR09MB8755.eurprd09.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: f8bf845a-a4c2-4123-3c37-08de86923301 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Mar 2026 15:06:01.0085 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9f85665b-7efd-4776-9dfe-b6bfda2565ee X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: rgan68snSfEBnIZy9NwM1UW2y195xRy4ureMLnmphwdJn7gB11ZIcEAaQeqWKBwR+ByrEg02nIDOwxMxl6+7d40CK7iPtnZbbe8OzCB/VTY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA2PR09MB7446 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019262424154100 The page table walker reads PTEs using address_space_ldl/ldq which use compile-time native endianness (always LE for RISC-V). However, when a big-endian kernel writes PTEs via normal store instructions, they are stored in big-endian byte order. The walker then misinterprets the PTE values, causing page faults and a hang when the kernel enables the MMU. The RISC-V privileged specification states that implicit data memory accesses to supervisor-level memory management data structures follow the hart's endianness setting (MSTATUS SBE/MBE bits). Fix both PTE reads and atomic A/D bit updates to use the explicit _le or _be memory access variants based on the hart's runtime endianness. Signed-off-by: Djordje Todorovic Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- target/riscv/cpu_helper.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index c28832e0e3..b3d33da13e 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -1365,9 +1365,13 @@ static int get_physical_address(CPURISCVState *env, = hwaddr *physical, } =20 if (riscv_cpu_mxl(env) =3D=3D MXL_RV32) { - pte =3D address_space_ldl_le(cs->as, pte_addr, attrs, &res); + pte =3D riscv_cpu_data_is_big_endian(env) + ? address_space_ldl_be(cs->as, pte_addr, attrs, &res) + : address_space_ldl_le(cs->as, pte_addr, attrs, &res); } else { - pte =3D address_space_ldq_le(cs->as, pte_addr, attrs, &res); + pte =3D riscv_cpu_data_is_big_endian(env) + ? address_space_ldq_be(cs->as, pte_addr, attrs, &res) + : address_space_ldq_le(cs->as, pte_addr, attrs, &res); } =20 if (res !=3D MEMTX_OK) { @@ -1566,12 +1570,24 @@ static int get_physical_address(CPURISCVState *env,= hwaddr *physical, if (memory_region_is_ram(mr)) { target_ulong *pte_pa =3D qemu_map_ram_ptr(mr->ram_block, addr1= ); target_ulong old_pte; + bool be =3D riscv_cpu_data_is_big_endian(env); if (riscv_cpu_sxl(env) =3D=3D MXL_RV32) { - old_pte =3D qatomic_cmpxchg((uint32_t *)pte_pa, cpu_to_le3= 2(pte), cpu_to_le32(updated_pte)); - old_pte =3D le32_to_cpu(old_pte); + uint32_t cmp =3D be ? cpu_to_be32(pte) + : cpu_to_le32(pte); + uint32_t val =3D be ? cpu_to_be32(updated_pte) + : cpu_to_le32(updated_pte); + old_pte =3D qatomic_cmpxchg((uint32_t *)pte_pa, + cmp, val); + old_pte =3D be ? be32_to_cpu(old_pte) + : le32_to_cpu(old_pte); } else { - old_pte =3D qatomic_cmpxchg(pte_pa, cpu_to_le64(pte), cpu_= to_le64(updated_pte)); - old_pte =3D le64_to_cpu(old_pte); + target_ulong cmp =3D be ? cpu_to_be64(pte) + : cpu_to_le64(pte); + target_ulong val =3D be ? cpu_to_be64(updated_pte) + : cpu_to_le64(updated_pte); + old_pte =3D qatomic_cmpxchg(pte_pa, cmp, val); + old_pte =3D be ? be64_to_cpu(old_pte) + : le64_to_cpu(old_pte); } if (old_pte !=3D pte) { goto restart; --=20 2.34.1 From nobody Sun Mar 22 14:18:59 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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b=nGAAbwMDP7q+GZFxjoznQ3tHBarVQrJtk5aI2kMc6j1CzXR9yx3UFU+QK1PAj+FflStfXvqbQG/SJ5XCzOPxWdckCwD3w6V1hoJ8VPMZvc66Rf7x66MQGUAUgjNQF7cXvTyjdGCWd8XkUhdsYYn4LJ/llacGS1QZX1/xs79HNzcX7T9k7YaRChF0RM+F8vSuf9uNAoxA7hLVb7L5NEQE46x4TMvoEiQM1L5NBVTtCutN4lV+BCtVu4VM1wXfaMak2Fl0D+XKyyreUZ3PAXioINEppXD/8dvCSfkuSuuZwXmedawt2vSE538WCG5ArayviQ+Me0eaORwgjbxa4cd3Tg== From: Djordje Todorovic To: "qemu-devel@nongnu.org" CC: "qemu-riscv@nongnu.org" , "cfu@mips.com" , "mst@redhat.com" , "marcel.apfelbaum@gmail.com" , "dbarboza@ventanamicro.com" , "philmd@linaro.org" , "alistair23@gmail.com" , "thuth@redhat.com" , Djordje Todorovic Subject: [PATCH v4 7/7] target/riscv: Support runtime endianness in virtio via sysemu callback Thread-Topic: [PATCH v4 7/7] target/riscv: Support runtime endianness in virtio via sysemu callback Thread-Index: AQHcuHsQc8iwW6haQk2z5mk2ezRqDA== Date: Fri, 20 Mar 2026 15:06:01 +0000 Message-ID: <20260320150552.169480-8-djordje.todorovic@htecgroup.com> References: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> In-Reply-To: <20260320150552.169480-1-djordje.todorovic@htecgroup.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=htecgroup.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c201::1; envelope-from=Djordje.Todorovic@htecgroup.com; helo=AM0PR83CU005.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @htecgroup.com) X-ZM-MESSAGEID: 1774019242052154100 Content-Type: text/plain; charset="utf-8" Implement the .virtio_is_big_endian SysemuCPUOps callback for RISC-V. This makes cpu_virtio_is_big_endian() return the correct endianness based on the hart's MSTATUS MBE/SBE/UBE bits, which is used by virtio_current_cpu_endian() during guest-initiated device resets. For bi-endian RISC-V targets, this ensures legacy virtio devices correctly detect the guest's runtime data endianness, matching how ARM handles its bi-endian support. Signed-off-by: Djordje Todorovic --- target/riscv/cpu.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index eed5afd27e..f813acf579 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -32,6 +32,7 @@ #include "migration/vmstate.h" #include "fpu/softfloat-helpers.h" #include "system/device_tree.h" +#include "system/hw_accel.h" #include "system/kvm.h" #include "system/tcg.h" #include "kvm/kvm_riscv.h" @@ -2713,11 +2714,21 @@ static int64_t riscv_get_arch_id(CPUState *cs) =20 #include "hw/core/sysemu-cpu-ops.h" =20 +static bool riscv_cpu_virtio_is_big_endian(CPUState *cs) +{ + RISCVCPU *cpu =3D RISCV_CPU(cs); + CPURISCVState *env =3D &cpu->env; + + cpu_synchronize_state(cs); + return riscv_cpu_data_is_big_endian(env); +} + static const struct SysemuCPUOps riscv_sysemu_ops =3D { .has_work =3D riscv_cpu_has_work, .get_phys_page_debug =3D riscv_cpu_get_phys_page_debug, .write_elf64_note =3D riscv_cpu_write_elf64_note, .write_elf32_note =3D riscv_cpu_write_elf32_note, + .internal_is_big_endian =3D riscv_cpu_virtio_is_big_endian, .legacy_vmsd =3D &vmstate_riscv_cpu, }; #endif --=20 2.34.1