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b=eFHOn2YyxlVGyBTDXzi1IMwEG9i37WHJmkrSaXuiyq9f2on1EAUxzgcF3s3GhPBxkGa5YAlCyXynrrmqKull4ORCrU44jAssI9+BqJzoZFhqw34l44qf0Wy8O7+YSiVW3jdHspnR9HkC+fgolSfbfheyY/cUQKHJdpDnDiE8nsfLTVrr/qk5wAwPDO2SxNrBX/HKtnhJgTuSSZPu/7RGQwj9jM2x/y5rjH5Ve5D+lzW5jsIZ8hEpd+jSFb4ZskS4iLYXY3iDNWV0qf68NFigLViL/boQBmwgCWAR215JDlP2bubMGGGkue2nB347WFXWYosd76mwygKEGX5LBvtCaA== 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 6/7] target/riscv: Fix page table walk endianness for big-endian harts Thread-Topic: [PATCH v4 6/7] target/riscv: Fix page table walk endianness for big-endian harts Thread-Index: AQHcuHsQu7G51v/OY0ipe6MVjgMSug== Date: Fri, 20 Mar 2026 15:06:00 +0000 Message-ID: <20260320150552.169480-7-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: 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