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Wed, 25 Mar 2026 03:47:43 -0700 (PDT) X-Received: by 2002:a05:600c:1e8f:b0:486:fcc7:d6a with SMTP id 5b1f17b1804b1-48715feaad1mr43452975e9.13.1774435662704; Wed, 25 Mar 2026 03:47:42 -0700 (PDT) Received: from [192.168.0.9] ([47.64.113.85]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-487116c0c13sm256079375e9.7.2026.03.25.03.47.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Mar 2026 03:47:42 -0700 (PDT) Message-ID: <93b00f05-0c59-4c53-bee6-0f0b874a7b28@redhat.com> Date: Wed, 25 Mar 2026 11:47:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 1/7] target/riscv: Add big-endian CPU property To: Djordje Todorovic , "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" References: <20260324164007.549397-1-djordje.todorovic@htecgroup.com> <20260324164007.549397-2-djordje.todorovic@htecgroup.com> Content-Language: en-US From: Thomas Huth Autocrypt: addr=thuth@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 24/03/2026 17.40, Djordje Todorovic wrote: > 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_rules[] = { > > static const Property riscv_cpu_properties[] = { > DEFINE_PROP_BOOL("debug", RISCVCPU, cfg.debug, true), > + DEFINE_PROP_BOOL("big-endian", RISCVCPU, cfg.big_endian, false), Note that there is also a DEFINE_PROP_ENDIAN available ... not sure whether it's a better fit here, though. Maybe mention in the patch description why BOOL is better than ENDIAN here? Thomas