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Mon, 14 Mar 2022 19:49:24 +0000 (GMT) From: Matthew Rosato To: linux-s390@vger.kernel.org Subject: [PATCH v4 27/32] KVM: s390: intercept the rpcit instruction Date: Mon, 14 Mar 2022 15:44:46 -0400 Message-Id: <20220314194451.58266-28-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220314194451.58266-1-mjrosato@linux.ibm.com> References: <20220314194451.58266-1-mjrosato@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: riGnR9-O1SW95wh5PuJ0eEFFQ_lVtcIH X-Proofpoint-ORIG-GUID: 72FXc0OO0PISfWeRqbD5ARFbLQC2DMsU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.850,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-14_13,2022-03-14_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 priorityscore=1501 phishscore=0 impostorscore=0 adultscore=0 mlxlogscore=845 malwarescore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2203140116 Cc: kvm@vger.kernel.org, david@redhat.com, thuth@redhat.com, linux-kernel@vger.kernel.org, vneethv@linux.ibm.com, agordeev@linux.ibm.com, imbrenda@linux.ibm.com, will@kernel.org, frankja@linux.ibm.com, corbet@lwn.net, linux-doc@vger.kernel.org, pasic@linux.ibm.com, jgg@nvidia.com, gerald.schaefer@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com, gor@linux.ibm.com, schnelle@linux.ibm.com, hca@linux.ibm.com, alex.williamson@redhat.com, freude@linux.ibm.com, pmorel@linux.ibm.com, cohuck@redhat.com, oberpar@linux.ibm.com, iommu@lists.linux-foundation.org, svens@linux.ibm.com, pbonzini@redhat.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" For faster handling of PCI translation refreshes, intercept in KVM and call the associated handler. Signed-off-by: Matthew Rosato --- arch/s390/kvm/priv.c | 46 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index 417154b314a6..546c99a0e0b6 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -29,6 +29,7 @@ #include #include "gaccess.h" #include "kvm-s390.h" +#include "pci.h" #include "trace.h" static int handle_ri(struct kvm_vcpu *vcpu) @@ -335,6 +336,49 @@ static int handle_rrbe(struct kvm_vcpu *vcpu) return 0; } +static int handle_rpcit(struct kvm_vcpu *vcpu) +{ + int reg1, reg2; + int rc; + + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); + + /* KVM can only handle if we support KVM-managed IOMMU */ + if (!IS_ENABLED(CONFIG_S390_KVM_IOMMU)) + return -EOPNOTSUPP; + + kvm_s390_get_regs_rre(vcpu, ®1, ®2); + + /* If the device has a SHM bit on, let userspace take care of this */ + if (((vcpu->run->s.regs.gprs[reg1] >> 32) & aift->mdd) != 0) + return -EOPNOTSUPP; + + rc = kvm_s390_pci_refresh_trans(vcpu, vcpu->run->s.regs.gprs[reg1], + vcpu->run->s.regs.gprs[reg2], + vcpu->run->s.regs.gprs[reg2 + 1]); + + switch (rc) { + case 0: + kvm_s390_set_psw_cc(vcpu, 0); + break; + case -ENOMEM: + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00ffffffUL; + vcpu->run->s.regs.gprs[reg1] |= (u64)4 << 24; + kvm_s390_set_psw_cc(vcpu, 1); + break; + case -EIO: + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00ffffffUL; + vcpu->run->s.regs.gprs[reg1] |= (u64)16 << 24; + kvm_s390_set_psw_cc(vcpu, 1); + break; + default: + kvm_s390_set_psw_cc(vcpu, 3); + } + + return 0; +} + #define SSKE_NQ 0x8 #define SSKE_MR 0x4 #define SSKE_MC 0x2 @@ -1275,6 +1319,8 @@ int kvm_s390_handle_b9(struct kvm_vcpu *vcpu) return handle_essa(vcpu); case 0xaf: return handle_pfmf(vcpu); + case 0xd3: + return handle_rpcit(vcpu); default: return -EOPNOTSUPP; } -- 2.27.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu