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Fri, 9 Oct 2026 12:30:56 +0000 (GMT) Received: from li-fbf77acc-29ba-11b2-a85c-e8e934f50a46.ibmuc.com (unknown [9.39.27.243]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 9 Oct 2026 12:30:56 +0000 (GMT) From: Gautam Menghani To: maddy@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au, chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com, amachhiw@linux.ibm.com Cc: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/4] KVM: PPC: Book3S HV: XICS: Avoid masking VP IPI on init failure Date: Fri, 9 Oct 2026 18:00:32 +0530 Message-ID: <20261009123035.157770-4-gautam@linux.ibm.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261009123035.157770-1-gautam@linux.ibm.com> References: <20261009123035.157770-1-gautam@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: H_Rb5at_LdYDTpaoBUUjRRdmVZBEu8Qr X-Proofpoint-ORIG-GUID: 9b4bP_ioE2mbmHs36j7zTILefAe-OMQW X-Authority-Analysis: v=2.4 cv=H8NOUOYi c=1 sm=1 tr=0 ts=6ac8de88 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=5A-eSp_wyuwTZ9lofRAA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA5MDA0OCBTYWx0ZWRfX7TIjKzUl1266 5LNjA1F6g1Q30B4x79c3pBTOT2Nqh1rQC2Vqdq+4HkGnWDq611vvyvSXeKnFTVAkqv82RXa5mLX ZIqGmLskvwp0fUPc0I+D746rf/3dF0QTloiHrYVGlsG95W4Aj/y7JSflgkg5yuCB+qHgrTe0Rt6 +adZbAxk0jezL87DMSWXveFvfgzwUufX/tFFUsRQTbXdP6F6kP65GoiCuLZZMeWQcDt2hBQogf3 n2xsACEVqXyzquE7zJlki2lRm3HsXZMUhXMeLxZz4r0qnT+GSPSl4W8gXTAL22oKwfS6lwUqoi/ EXFpH+j+xJ7blQJ11t2kyNpZ5WrKoDbA2vtL9aeuReyLGPc/dRqyMFq9itImtTLCDHYbORx9Riv 8aVTOOOE5UkX7KpQ14p6Vi2Yy1zz5j1DHpPyT0dCpVj/H7p4jsI9kr99nbwE3oFfe82nRZ4d+eh sjSs+lo/ZEM5AXv+Qwg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA5MDA0OCBTYWx0ZWRfXxLuy7qQlKR68 opDg7cCM1x6HkCqjJ3+VINTceNh8xoilABeAc7ZIxHantLuaPA5ZGnNAOYH+5o6jtl9bJAQrrmq jZTahJN3RmrEtvVF7IZmvuJ5+G4UysA= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-09_03,2026-10-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 spamscore=0 priorityscore=1501 malwarescore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610020000 definitions=main-2610090048 In kvmppc_xive_connect_vcpu() if there is a failure before xc->vp_ipi_data is setup, it can result in a NULL pointer dereference in kvmppc_xive_cleanup_vcpu(). Fix this by adding a check before masking the VP IPI before accessing the MMIO pages. Signed-off-by: Gautam Menghani --- arch/powerpc/kvm/book3s_xive.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index 67219044fb8c..b27127c43315 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -1818,7 +1818,8 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) kvmppc_xive_disable_vcpu_interrupts(vcpu); /* Mask the VP IPI */ - xive_vm_esb_load(&xc->vp_ipi_data, XIVE_ESB_SET_PQ_01); + if (xc->vp_ipi_data.eoi_mmio) + xive_vm_esb_load(&xc->vp_ipi_data, XIVE_ESB_SET_PQ_01); /* Free escalations */ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { -- 2.55.0