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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