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[86.49.249.15]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9c3c99fc09sm92146666b.17.2026.04.02.06.35.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 06:35:07 -0700 (PDT) Mime-Version: 1.0 Date: Thu, 02 Apr 2026 15:35:05 +0200 Message-Id: Subject: Re: [PATCH v3 1/3] lib: sbi: Add RISC-V vector context save/restore support Cc: "Scott Bambrough" , "Robin Randhawa" , "Anup Patel" , "Ray Mao" , "Anup Patel" , "Dhaval" , "Peter Lin" , , "opensbi" To: , "Samuel Holland" From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= References: <20260331055858.305207-1-dave.patel@riscstar.com> <20260331055858.305207-2-dave.patel@riscstar.com> In-Reply-To: <20260331055858.305207-2-dave.patel@riscstar.com> X-Proofpoint-ORIG-GUID: 8-y8GHXMI-NOR34fNG8op_vVpe1sczK8 X-Proofpoint-GUID: 8-y8GHXMI-NOR34fNG8op_vVpe1sczK8 X-Authority-Analysis: v=2.4 cv=RoLI7SmK c=1 sm=1 tr=0 ts=69ce708f cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=fuErIE+P63Icv3tqjtEZBw==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=M51BFTxLslgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=ee_2aqc6AAAA:8 a=4dUiZ8GAKDosNzctChQA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 a=VOpmJXOdbJOWo2YY3GeN:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDEyMCBTYWx0ZWRfXzlzCfwxICCXx ACanlDS99uzOCml6p5+a+4AigmRlxiQ5jBaNtcBBw5JnlaDAtPuNc+C3XY8aNZYwTIYSsIhcyqA vmrlssdflyIm9DPAS76BG1XlQUAir/zlSVBDKz1//s6p5VHHdYmy4QRNi4uDhMDerF3tmPuJJVL NkVmiRYnQi3dj1tDVQdDTAvcACgWY6C68p90cpl5IfBdSfJdqT4kZRfuPIU58lyb60L/r7dKLvr dlxO1Q/RG7kZE7hAmL5dQxCM6pdUXLVwk3UcdQqUMPHOFnKLAH+92oc932rnw7XvfBIAfL9apBB XdrYvyv2sK1yLTuPNpc3zX1owGQ5mR90jlBU5PnxkyI0Mfrb7x7dV9jBgxU1v5pjjH7jkA8N41H KTL9mG5e3/48mV/raweSDw3T3J7ofPBDZrTfs3ogwiJ1H535N2KLUaZQ53pcZ5NGYip5USUfDJ2 xQMXpnq5i4dELW1QlCg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-02_02,2026-04-02_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 impostorscore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020120 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260402_143514_965036_871D3FD7 X-CRM114-Status: GOOD ( 10.92 ) X-BeenThere: opensbi@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "opensbi" Errors-To: opensbi-bounces+opensbi=archiver.kernel.org@lists.infradead.org 2026-03-31T06:58:55+01:00, : > From: Dave Patel > > Eager context switch: Add support for saving and restoring RISC-V vector > extension state in OpenSBI. This introduces a per-hart vector context > structure and helper routines to perform full context save and restore. > > The vector context includes vl, vtype, vcsr CSRs along with storage for all > 32 vector registers. The register state is saved and restored using byte-wise > vector load/store instructions (vse8.v/vle8.v), making the implementation > independent of current SEW/LMUL configuration. > > The implementation follows an eager context switching model where the entire > vector state is saved and restored on every context switch. This provides a > simple and deterministic mechanism without requiring lazy trap-based > management. > > Notes: > - The SBI_MAX_VLENB is configured using CONFIG_SBI_MAX_VLENB. > > Signed-off-by: Dave Patel > --- You missed my comment on [v2 1/3]: https://lore.kernel.org/opensbi/DHG4IUERGFUV.3TT9CFPZ9YEDG@qti.qualcomm.com/ The two points are: 1. Possible cross-domain data access. 2. Writes to read-only CSRs. Thanks. -- opensbi mailing list opensbi@lists.infradead.org http://lists.infradead.org/mailman/listinfo/opensbi