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[86.49.249.15]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b9c3c971f03sm114386766b.7.2026.04.02.11.19.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Apr 2026 11:19:49 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 02 Apr 2026 20:19:48 +0200 Message-Id: Cc: , , , , , , To: , , , , , , , , , From: =?utf-8?q?Radim_Kr=C4=8Dm=C3=A1=C5=99?= Subject: Re: [PATCH v7 3/4] RISC-V: KVM: Detect and expose supported HGATP G-stage modes References: <20260402132303.6252-1-fangyu.yu@linux.alibaba.com> <20260402132303.6252-4-fangyu.yu@linux.alibaba.com> In-Reply-To: <20260402132303.6252-4-fangyu.yu@linux.alibaba.com> X-Proofpoint-GUID: 03xXTFOTwQASus4AVKTASiUc--D172p2 X-Proofpoint-ORIG-GUID: 03xXTFOTwQASus4AVKTASiUc--D172p2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDE2NCBTYWx0ZWRfX0kdtZXxyKFkN Zm9snkATDnR0xXhJNytwTjQyRd/Wo2yC+xMhAX50qotCNMQEdfwA2DXK4eGwUpMtsajIdR7JbMA lFcvhe6tDET2gFbbJEXEUyYbdMpPnLMUFExdJcM/Nwky1CYiYkthus5SjZRtF4kdGkM71mfbgj0 bckZfubIiB/T3X+uoD8sxTWFn6+miWTc9P1chRdS7kXjPz+TXXL1mtg2cYyNm+8EO4/i9ewbBNw DHvAnWyv+5FYXFm8FRnn18u/zWnrL0K1n+AS2/gBuBAVoKNhDz1bJ17LCYdQ8mEm3Nsk4JojQe9 kKpl37LvnGg+MNs5li6ZHBGkzTKTBvSCeqM/P8XQ2jpIiBPa9Fq1KKnWR1XI5F8y2Gg0X7+MscH oI4EJLLQnO9q3MElfFtzgrOOJNyM1wUx89XyXcee+mJlHlz4ajDbi91fdrUGcoWT+LYNJsyfD65 HT5ekMe3gn5fyHQlkpQ== X-Authority-Analysis: v=2.4 cv=HKXO14tv c=1 sm=1 tr=0 ts=69ceb347 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==: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=DJpcGTmdVt4CTyJn9g5Z:22 a=SRrdq9N9AAAA:8 a=EUspDBNiAAAA:8 a=VwQbUJbxAAAA:8 a=qHmfJlKEtTjsIq712WoA:9 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 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_03,2026-04-02_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604020164 2026-04-02T21:23:02+08:00, : > From: Fangyu Yu > > Extend kvm_riscv_gstage_mode_detect() to record HGATP.MODE values in a > bitmask. Keep tracking the maximum supported G-stage page table level > for existing internal users. > > Also provide lightweight helpers to retrieve the supported-mode bitmask > and validate a requested HGATP.MODE against it. > > Signed-off-by: Fangyu Yu > Reviewed-by: Andrew Jones > Reviewed-by: Guo Ren > --- > diff --git a/arch/riscv/include/asm/kvm_gstage.h b/arch/riscv/include/asm= /kvm_gstage.h > @@ -102,4 +103,14 @@ static inline void kvm_riscv_gstage_init(struct kvm_= gstage *gstage, struct kvm * > +static inline bool kvm_riscv_hgatp_mode_is_valid(unsigned long mode) > +{ > + return kvm_riscv_gstage_supported_mode_mask & BIT(mode); Shifting by more than the bit width is undefined behavior in C. RV64 effectively translates BIT(mode) to 1UL << (mode & 0x3f), so this could allow values larger than the mask. Thanks.