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Sun, 13 Apr 2025 20:46:35 -0700 (PDT) From: Ziqiao Kong To: qemu-devel@nongnu.org Cc: ziqiaokong@gmail.com, qemu-trivial@nongnu.org, alistair.francis@wdc.com, richard.henderson@linaro.org Subject: [PATCH v2 1/1] target/riscv: fix endless translation loop on big endian systems Date: Mon, 14 Apr 2025 11:46:26 +0800 Message-Id: <20250414034626.3491489-2-ziqiaokong@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250414034626.3491489-1-ziqiaokong@gmail.com> References: <20250414034626.3491489-1-ziqiaokong@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=2607:f8b0:4864:20::52b; envelope-from=ziqiaokong@gmail.com; helo=mail-pg1-x52b.google.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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: 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 @gmail.com) X-ZM-MESSAGEID: 1744602448677019000 Content-Type: text/plain; charset="utf-8" On big endian systems, pte and updated_pte hold big endian host data while pte_pa points to little endian target data. This means the branch at cpu_helper.c:1669 will be always satisfied and restart translation, causing an endless translation loop. Signed-off-by: Ziqiao Kong --- target/riscv/cpu_helper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index 6c4391d96b..bc146771c8 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -1662,9 +1662,9 @@ static int get_physical_address(CPURISCVState *env, h= waddr *physical, target_ulong *pte_pa =3D qemu_map_ram_ptr(mr->ram_block, addr1= ); target_ulong old_pte; if (riscv_cpu_sxl(env) =3D=3D MXL_RV32) { - old_pte =3D qatomic_cmpxchg((uint32_t *)pte_pa, pte, updat= ed_pte); + old_pte =3D qatomic_cmpxchg((uint32_t *)pte_pa, cpu_to_le3= 2(pte), cpu_to_le32(updated_pte)); } else { - old_pte =3D qatomic_cmpxchg(pte_pa, pte, updated_pte); + old_pte =3D qatomic_cmpxchg(pte_pa, cpu_to_le64(pte), cpu_= to_le64(updated_pte)); } if (old_pte !=3D pte) { goto restart; --=20 2.34.1