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Thu, 9 Jan 2025 13:21:21 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4CE5320040; Thu, 9 Jan 2025 13:21:18 +0000 (GMT) Received: from li-e7e2bd4c-2dae-11b2-a85c-bfd29497117c.ibm.com.com (unknown [9.124.223.189]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 9 Jan 2025 13:21:18 +0000 (GMT) From: Amit Machhiwal To: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Cc: Amit Machhiwal , Vaibhav Jain , Shivaprasad G Bhat , Christophe Leroy , Naveen N Rao , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] KVM: PPC: Enable CAP_SPAPR_TCE_VFIO on pSeries KVM guests Date: Thu, 9 Jan 2025 18:50:53 +0530 Message-ID: <20250109132053.158436-1-amachhiw@linux.ibm.com> X-Mailer: git-send-email 2.47.1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: hvpgz_N-ryofrwSI8xwElybReki8Q0Ff X-Proofpoint-ORIG-GUID: GT_WvY8RHmULRGyFL4N4ZliWEMN7eZqS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 priorityscore=1501 mlxlogscore=808 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1011 suspectscore=0 phishscore=0 malwarescore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501090104 X-Spam-Status: No, score=-0.7 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, RCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org Currently, on book3s-hv, the capability KVM_CAP_SPAPR_TCE_VFIO is only available for KVM Guests running on PowerNV and not for the KVM guests running on pSeries hypervisors. This prevents a pSeries hypervisor from leveraging the in-kernel acceleration for H_PUT_TCE_INDIRECT and H_STUFF_TCE hcalls that results in slow startup times for large memory guests. Fix this by enabling the CAP_SPAPR_TCE_VFIO on the pSeries hosts for the nested PAPR guests. Fixes: f431a8cde7f1 ("powerpc/iommu: Reimplement the iommu_table_group_ops for pSeries") Cc: stable@vger.kernel.org Signed-off-by: Amit Machhiwal --- arch/powerpc/kvm/powerpc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) base-commit: eea6e4b4dfb8859446177c32961c96726d0117be diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index ce1d91eed231..9c479c7381e4 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -554,7 +554,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = 1; break; case KVM_CAP_SPAPR_TCE_VFIO: - r = !!cpu_has_feature(CPU_FTR_HVMODE); + r = !!cpu_has_feature(CPU_FTR_HVMODE) || is_kvmppc_hv_enabled(kvm); break; case KVM_CAP_PPC_RTAS: case KVM_CAP_PPC_FIXUP_HCALL: