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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493be4d2bc5sm85459685e9.5.2026.07.01.08.07.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Jul 2026 08:07:11 -0700 (PDT) Message-ID: <5a848836-78fe-40b7-a34a-c64882c0575a@oss.qualcomm.com> Date: Wed, 1 Jul 2026 17:07:10 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 09/11] KVM: x86: Treat a vCPU as unreachable if its index is invalid Content-Language: en-US To: Sean Christopherson , Vitaly Kuznetsov , Paolo Bonzini , David Woodhouse , Paul Durrant Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+5b32c49cd8f005e65654@syzkaller.appspotmail.com, syzbot+5d2b94b77112148d1744@syzkaller.appspotmail.com, David Woodhouse References: <20260630225619.511632-1-seanjc@google.com> <20260630225619.511632-10-seanjc@google.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260630225619.511632-10-seanjc@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: -ZOekLRTZBCSI_VQfN3vhk0XQ52XC-Jy X-Authority-Analysis: v=2.4 cv=fLgJG5ae c=1 sm=1 tr=0 ts=6a452d22 cx=c_pps a=+D9SDfe9YZWTjADjLiQY5g==:117 a=4s3hRJSeHn4rkQlkrse1kQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=M51BFTxLslgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=1XWaLZrsAAAA:8 a=EUspDBNiAAAA:8 a=1tSEMpTH9XP_W59IOagA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ZXulRonScM0A:10 a=vmgOmaN-Xu0dpDh8OwbV:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAxMDE1OSBTYWx0ZWRfX3YitWRYiy+0d NkJA60Vdu38Xm7NDBV+M4P5ssysGExqWtDnftM8pvY8D2j6xi1VnVMQkvWOg2uCvDWKYtamkLWb jzavFyDL0EtvBjwWgLY+4Ca6pJS6Ar5JL7hf5BJquO0tdI8njvjSjGB2mZeGtrnvhfjdtrXnQTH lWfAHCaOZRejHfiRZhHUhnb64qJHtyCvM1aK+O4L97ynFrABnYBrm3fKD94npsT7E46WC0Y9TKO KmVqK1nSKoflljMALc7Qcx+6AfIyP/X/BxTrzd0yikDb94sYhasjIpSzPyEFYFiOAkJo2FMr54U XOv6n2zShqY99TicJVmsAQBWbYHjAqZeZWUj1MhEjCw+1oYEd71YQMK6aEuogWLo0Z/1ly1H4lz sS4dOgFwHeuPiZtFI9H/DX/itK60WhxHoZrvwUHOe+7Hv5ErqkSOg4e/gxM3wluNbLzpfkKv2uG jH6Lk0EhiKvKl4CoAQg== X-Proofpoint-ORIG-GUID: -ZOekLRTZBCSI_VQfN3vhk0XQ52XC-Jy X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAxMDE1OSBTYWx0ZWRfX+pXXtxP/KgbV j8XwnAFaRmijEFV56z2sh9/20h0ELtPzPrUf0n3GrFxPvscs0W1XOU+IDIEguyO4VRBFptT6H4X 4liZcis0/wWE2/+0pVtCqDW8+xwMF8Q= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-01_03,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 phishscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 bulkscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607010159 On 1/7/26 00:56, Sean Christopherson wrote: > In the "vCPU locked or unreachable" lockdep assertion, treat a vCPU as > unreachable if its index is invalid, i.e. if the vCPU is in the process of > being created. Until the vCPU is inserted into the array of vCPUs, the > only way to get at the vCPU is via kvm_vm_ioctl_create_vcpu(). Note, the > actual index is set _before_ adding the vCPU to the array, i.e. there's no > risk of a false negative on the lockdep assertion. > > Signed-off-by: Sean Christopherson > --- > include/linux/kvm_host.h | 1 + > 1 file changed, 1 insertion(+) Reviewed-by: Philippe Mathieu-Daudé