From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 99611345CAE for ; Thu, 2 Apr 2026 18:19:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775153993; cv=none; b=HxZrZ1FDFXQWOrqZJ79tYYJotKR9caMF+w/ILFEOGw+RsEAAJzPYT/T7Tg1t+1YFtZxSKykwvi/q/GMYMyE4YFon3EnRrDqh0md1fGfPWhEGbn/wcTmadKXlGWkds2Cwl810X/NmH1l019okQIS6jbCpabeA+DWKcYZSCLfxPVY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775153993; c=relaxed/simple; bh=cphyPCgyL6ebWPWnpuwMV/17NOnBN54i6xVER3IgbQc=; h=Mime-Version:Content-Type:Date:Message-Id:Cc:To:From:Subject: References:In-Reply-To; b=YzUG6+ybOUwhb1P2VBM1lYtDmLu7AcDQaxeMwQw81e58wjV4KLg+jsOsxGJ7rg+RbVd7QKuBXiavf15RGO8usTBfBlL7jzfSUKJe8Id1+8X3YaoaofqmVLKDZ2DbcvJcWWoVFpXIgHMXnqGORckLWC8Q13CGJpVQSM4HnWhNhsI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=dYc0L+M/; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=HwApsvXl; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="dYc0L+M/"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="HwApsvXl" Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 632G4TAi2255083 for ; Thu, 2 Apr 2026 18:19:52 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= wiDkn4M6EeOZO6HfXfs1fLrNAiZ96hbYdrTrvNXFkyM=; b=dYc0L+M/7pKMzfsJ Xxh2RKcWwrM1NMLt7U9a1q/qJ8EUI4G1em6m584wOhh2e5MRjqxDvWnj2rSW4YWA pWMx3EtqUW7MWn+AlPactqXGo8LxbLsmeD4m5hpdoFqmZtKB5TvpfYyHHot7ABsK y8pKqzeWw9pnnF8teo5Lfc+ltfck6i0+fN9YQJqbCrBFxGComSp9JzdU3G02GR01 zJ2Ff4dVxsGLydLlF78ZyMnLobclfcZf6NUCGL8k+nMkqP8gTPN0b5uOo5tuNfoU GlBardYOabKU5XtR+g0ZF4G33Yji6oyFNaFovSOQYfnzFPXwYhYxAuHATSOD03k9 QtEboA== Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4d9n4t29g9-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 02 Apr 2026 18:19:51 +0000 (GMT) Received: by mail-qt1-f199.google.com with SMTP id d75a77b69052e-50b802961ecso15789761cf.1 for ; Thu, 02 Apr 2026 11:19:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1775153991; x=1775758791; darn=vger.kernel.org; h=in-reply-to:references:subject:from:to:cc:message-id:date :content-transfer-encoding:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=wiDkn4M6EeOZO6HfXfs1fLrNAiZ96hbYdrTrvNXFkyM=; b=HwApsvXlZRpQacDjqV4SSelAXBjRi/FXN1fdPqCc+el2IbgYhQJOXH4zYr8ANWCJwL OkK+8DIbl4spDW0THmNnZWDZ44RFhEmZsQ1LZ4rtaT4CTsDcH/v/CgM6aILdX7JpMsEc aKg171shZPC0RTz+QprvE50aQSvEgP7jhL7lViDLF1B1wyyKlLrjFiD0mDVyHMsA8cij jrumXmYcjPEl+KzbHjvocddjC77fpvpI69I4lSpdGdLAr0vRJ4Kj4utxzjl2F2mTiubE A2O4ncTR8WIV8L76iDZMhb4tSH9w8ZxvpCIQX78ccckMwAD+GpvBwHRc1MSghfGn7BtG Q9dw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775153991; x=1775758791; h=in-reply-to:references:subject:from:to:cc:message-id:date :content-transfer-encoding:mime-version:x-gm-gg:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=wiDkn4M6EeOZO6HfXfs1fLrNAiZ96hbYdrTrvNXFkyM=; b=JUeTJUjwAMvSNVl67NIo09s1rLPXoNNjDJhhEJKrGFyCBBKjAN7aY9X1YtqmLmy/uH W7I0E6IIXw5/FOnoqZvBLNhqoUs0T9Vm+M74pO/gQPsqORCH75wO2Mk8Ji0Ri0dD6hLZ GYmIOrH6HzRRRx1pA+ZQPXogwsV8FHWj///uin32UAxtS5plzcVfCqUTNWvkWhLkSWGl U44h634ggzaftvKfIIdZSpu2wMXh9/wyOTqtXB8ZhQTStSRSwxPrJ3qXtaG+rVIZINKk KDY8yxdvrUbkbdf93rJzLV6/UE6vt43fwmRrusnF3inEJL1Cb3dBiCLl3tXIegPb/qv4 LVrA== X-Forwarded-Encrypted: i=1; AJvYcCVfu/4ydPhIW4rxlFdLgsPOLsTZ4ZZxHKXsaty1lDpjGKMHC7sH5yMhRhNdyHHmlFkarvDvhzZvNas=@vger.kernel.org X-Gm-Message-State: AOJu0YyAPrzfSLDYq9V2vN0x10q0eiJvpncKK3PBZsk2z0Nw6bLLhiDp RJtHDlCQUhn3XGy49/fVsI/ZT4zQluUycFHqwJWjWI2xB59M4G31DABaPLtuVHqmjqMy5t6MrkQ 4mi+k0j4pEFuV0JL9HiE2Cv1jOGaqkAF9G4hds3b2Bn7veqI5hAhA8+8tu+FJxn8= X-Gm-Gg: ATEYQzy9/GoRL9nCZUX/wJqslE4t1ZjyMZAhdjUjq9k9ZyDGPhivSgFg5pWm572seIp IYVud0lkvkKafPKJusbXFFVBQr4XSKm/Q+vZSb+I3NU2vNf8DmBA5si4GUV0G+WEfnvMPXN4XU8 wzXQLWB69+wBRqMQSzLf9RyOc9AC1ypQ0y3p4nwnbNH2zNbxrYfB71PyoVgEv4MagFPvlKPE4PW sWdfGgp+2zmXx6qvZhW7p2AfM41/Ub6gCMh7117YMjhVIDQt06z7WlFf2x8/T7ia9dsAyE0pXI/ BhR+rujC0Ec/fmnM3Da1efMQNZhNmOxjCVuWq7Igrx7jgjgkT4vXHF4eYAzLqucXEE6A+D7EiIr oVhlZijE9EZ0kgyNjRZKniQoBG9zY6U5eLFGtpxdcXXZpNtK6iFn28KsefqEd X-Received: by 2002:a05:622a:aa12:20b0:50d:4199:8c88 with SMTP id d75a77b69052e-50d62772bddmr5001871cf.1.1775153990870; Thu, 02 Apr 2026 11:19:50 -0700 (PDT) X-Received: by 2002:a05:622a:aa12:20b0:50d:4199:8c88 with SMTP id d75a77b69052e-50d62772bddmr5001461cf.1.1775153990314; Thu, 02 Apr 2026 11:19:50 -0700 (PDT) Received: from localhost (ip-86-49-249-15.bb.vodafone.cz. [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-doc@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-ORIG-GUID: mFXm6D2IULZrvwItJDwcPPaLXxlokYJ_ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDAyMDE2NCBTYWx0ZWRfX8cdwtPx5/B3W 9XqgRVmVU1jRZGgSss24FA10HLuojdSuvdKJ1aHturTsA/WtisBPFs7BelnsiQbtBuiy/l5NRKc 8JdS3kEJjpLeRF3NmhEh+3gQVikkVtGQg8OITJQ75DhEZo4uYh/KD2FbsI5U4TeTpaQgptCSUZR BfgyAxNxHBMuSAkQQXvsrWUx7jjbrvefdKQlyGo3jH676cnI5053akjE4wRdjguUnUIhpy6tlK0 xROOGIlxO4lpj5ZsUxUUU856YZ9jaN/wJFJmaTXU8flA/tg27+9J1VbIXvjVkv7TcStfokNav/A Iwu8MH8PQicV0dWYNwL0kS1bR+gHsbjODvH7zlPRWW+JXzxBG2VRxnj6m89cY3JcOHBoahYbFhS 6yyYt366kiBTCnyAMfBKGzq6by4GKRVMrMTCLYCdPNsz35DfN2qxvCZOYiFMOAZqcSj8LvRZ0sK 9lSJLY+2oIOLWlNwmgw== X-Proofpoint-GUID: mFXm6D2IULZrvwItJDwcPPaLXxlokYJ_ X-Authority-Analysis: v=2.4 cv=Ap/jHe9P c=1 sm=1 tr=0 ts=69ceb347 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=Um2Pa8k9VHT-vaBCBUpS:22 a=SRrdq9N9AAAA:8 a=EUspDBNiAAAA:8 a=VwQbUJbxAAAA:8 a=qHmfJlKEtTjsIq712WoA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU: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 priorityscore=1501 suspectscore=0 malwarescore=0 spamscore=0 clxscore=1015 bulkscore=0 impostorscore=0 adultscore=0 lowpriorityscore=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.