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Wed, 24 Jun 2026 02:01:29 -0700 (PDT) From: SeungJu Cheon To: qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, palmer@dabbelt.com, alistair.francis@wdc.com, liwei1518@gmail.com, daniel.barboza@oss.qualcomm.com, zhiwei_liu@linux.alibaba.com, chao.liu.zevorn@gmail.com, SeungJu Cheon Subject: [PATCH] target/riscv: Fix vsstatus.UXL reserved value Date: Wed, 24 Jun 2026 18:00:52 +0900 Message-ID: <20260624090052.463075-1-suunj1331@gmail.com> X-Mailer: git-send-email 2.52.0 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=lists1p.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1033; envelope-from=suunj1331@gmail.com; helo=mail-pj1-x1033.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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_ENVFROM_END_DIGIT=0.25, 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-Mailman-Approved-At: Wed, 24 Jun 2026 08:09:16 -0400 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 @gmail.com) X-ZM-MESSAGEID: 1782302999822158500 Content-Type: text/plain; charset="utf-8" By the priv spec the value "3" is marked as 'Reserved' for mstatus.UXL. write_mstatus() rejects this value, but write_vsstatus() does not, allowing the reserved value to be written and read back unchanged. Handle a vsstatus.UXL =3D 3 write by writing the current 'xl' instead. Fixes: f310df58bd2 ("target/riscv: Enable uxl field write") Signed-off-by: SeungJu Cheon --- target/riscv/csr.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index dd9726fcf4..4c1da61824 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -5226,7 +5226,15 @@ static RISCVException write_vsstatus(CPURISCVState *= env, int csrno, uint64_t mask =3D (target_ulong)-1; if ((val & VSSTATUS64_UXL) =3D=3D 0) { mask &=3D ~VSSTATUS64_UXL; + } else { + uint64_t uxl =3D (val & VSSTATUS64_UXL) >> 32; + if (uxl =3D=3D 3) { + int xl =3D riscv_cpu_mxl(env); + val =3D deposit64(val, 32, 2, + xl =3D=3D MXL_RV128 ? MXL_RV64 : xl); + } } + if ((env->henvcfg & HENVCFG_DTE)) { if ((val & SSTATUS_SDT) !=3D 0) { val &=3D ~SSTATUS_SIE; --=20 2.52.0