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Tue, 7 Dec 2021 20:59:40 +0000 (GMT) From: Matthew Rosato To: linux-s390@vger.kernel.org Cc: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com, pmorel@linux.ibm.com, borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 21/32] KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding Date: Tue, 7 Dec 2021 15:57:32 -0500 Message-Id: <20211207205743.150299-22-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211207205743.150299-1-mjrosato@linux.ibm.com> References: <20211207205743.150299-1-mjrosato@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: bSK0RR6BT1efFDKwbCDXbtoq4leSv4MF X-Proofpoint-ORIG-GUID: a7V7r_OkZVHlqk1s9uOwc4Sz1U2eXTl3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-07_08,2021-12-06_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 clxscore=1015 phishscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 mlxlogscore=963 malwarescore=0 impostorscore=0 bulkscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112070126 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These routines will be wired into the vfio_pci_zdev ioctl handlers to respond to requests to enable / disable a device for Adapter Event Notifications / Adapter Interuption Forwarding. Signed-off-by: Matthew Rosato --- arch/s390/include/asm/kvm_pci.h | 7 ++ arch/s390/kvm/pci.c | 199 ++++++++++++++++++++++++++++++++ arch/s390/pci/pci_insn.c | 1 + 3 files changed, 207 insertions(+) diff --git a/arch/s390/include/asm/kvm_pci.h b/arch/s390/include/asm/kvm_pci.h index 5d6283acb54c..54a0afdbe7d0 100644 --- a/arch/s390/include/asm/kvm_pci.h +++ b/arch/s390/include/asm/kvm_pci.h @@ -16,16 +16,23 @@ #include #include #include +#include struct kvm_zdev { struct zpci_dev *zdev; struct kvm *kvm; + struct zpci_fib fib; }; extern int kvm_s390_pci_dev_open(struct zpci_dev *zdev); extern void kvm_s390_pci_dev_release(struct zpci_dev *zdev); extern int kvm_s390_pci_attach_kvm(struct zpci_dev *zdev, struct kvm *kvm); +extern int kvm_s390_pci_aif_probe(struct zpci_dev *zdev); +extern int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib, + bool assist); +extern int kvm_s390_pci_aif_disable(struct zpci_dev *zdev); + extern int kvm_s390_pci_interp_probe(struct zpci_dev *zdev); extern int kvm_s390_pci_interp_enable(struct zpci_dev *zdev); extern int kvm_s390_pci_interp_disable(struct zpci_dev *zdev); diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c index 57cbe3827ea6..3a29398dd53b 100644 --- a/arch/s390/kvm/pci.c +++ b/arch/s390/kvm/pci.c @@ -10,6 +10,8 @@ #include #include #include +#include +#include #include #include "pci.h" #include "kvm-s390.h" @@ -120,6 +122,199 @@ int kvm_s390_pci_aen_init(u8 nisc) return rc; } +/* Modify PCI: Register floating adapter interruption forwarding */ +static int kvm_zpci_set_airq(struct zpci_dev *zdev) +{ + u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT); + struct zpci_fib fib = {0}; + u8 status; + + fib.fmt0.isc = zdev->kzdev->fib.fmt0.isc; + fib.fmt0.sum = 1; /* enable summary notifications */ + fib.fmt0.noi = airq_iv_end(zdev->aibv); + fib.fmt0.aibv = (unsigned long) zdev->aibv->vector; + fib.fmt0.aibvo = 0; + fib.fmt0.aisb = (unsigned long) aift.sbv->vector + (zdev->aisb/64) * 8; + fib.fmt0.aisbo = zdev->aisb & 63; + fib.gd = zdev->gd; + + return zpci_mod_fc(req, &fib, &status) ? -EIO : 0; +} + +/* Modify PCI: Unregister floating adapter interruption forwarding */ +static int kvm_zpci_clear_airq(struct zpci_dev *zdev) +{ + u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT); + struct zpci_fib fib = {0}; + u8 cc, status; + + fib.gd = zdev->gd; + + cc = zpci_mod_fc(req, &fib, &status); + if (cc == 3 || (cc == 1 && status == 24)) + /* Function already gone or IRQs already deregistered. */ + cc = 0; + + return cc ? -EIO : 0; +} + +int kvm_s390_pci_aif_probe(struct zpci_dev *zdev) +{ + if (!(sclp.has_aeni && test_facility(71))) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(kvm_s390_pci_aif_probe); + +int kvm_s390_pci_aif_enable(struct zpci_dev *zdev, struct zpci_fib *fib, + bool assist) +{ + struct page *aibv_page, *aisb_page = NULL; + unsigned int msi_vecs, idx; + struct zpci_gaite *gaite; + unsigned long bit; + struct kvm *kvm; + void *gaddr; + int rc = 0; + + /* + * Interrupt forwarding is only applicable if the device is already + * enabled for interpretation + */ + if (zdev->gd == 0) + return -EINVAL; + + kvm = zdev->kzdev->kvm; + msi_vecs = min_t(unsigned int, fib->fmt0.noi, zdev->max_msi); + + /* Replace AIBV address */ + idx = srcu_read_lock(&kvm->srcu); + aibv_page = gfn_to_page(kvm, gpa_to_gfn((gpa_t)fib->fmt0.aibv)); + srcu_read_unlock(&kvm->srcu, idx); + if (is_error_page(aibv_page)) { + rc = -EIO; + goto out; + } + gaddr = page_to_virt(aibv_page) + (fib->fmt0.aibv & ~PAGE_MASK); + fib->fmt0.aibv = (u64)gaddr; + + /* Pin the guest AISB if one was specified */ + if (fib->fmt0.sum == 1) { + idx = srcu_read_lock(&kvm->srcu); + aisb_page = gfn_to_page(kvm, gpa_to_gfn((gpa_t)fib->fmt0.aisb)); + srcu_read_unlock(&kvm->srcu, idx); + if (is_error_page(aisb_page)) { + rc = -EIO; + goto unpin1; + } + } + + /* AISB must be allocated before we can fill in GAITE */ + mutex_lock(&aift.lock); + bit = airq_iv_alloc_bit(aift.sbv); + if (bit == -1UL) + goto unpin2; + zdev->aisb = bit; + zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | + AIRQ_IV_BITLOCK | + AIRQ_IV_GUESTVEC, + (unsigned long *)fib->fmt0.aibv); + + spin_lock_irq(&aift.gait_lock); + gaite = (struct zpci_gaite *) aift.gait + (zdev->aisb * + sizeof(struct zpci_gaite)); + + /* If assist not requested, host will get all alerts */ + if (assist) + gaite->gisa = (u32)(u64)&kvm->arch.sie_page2->gisa; + else + gaite->gisa = 0; + + gaite->gisc = fib->fmt0.isc; + gaite->count++; + gaite->aisbo = fib->fmt0.aisbo; + gaite->aisb = (u64)(page_address(aisb_page) + (fib->fmt0.aisb & + ~PAGE_MASK)); + aift.kzdev[zdev->aisb] = zdev->kzdev; + spin_unlock_irq(&aift.gait_lock); + + /* Update guest FIB for re-issue */ + fib->fmt0.aisbo = zdev->aisb & 63; + fib->fmt0.aisb = (unsigned long) aift.sbv->vector + (zdev->aisb/64)*8; + fib->fmt0.isc = kvm_s390_gisc_register(kvm, gaite->gisc); + + /* Save some guest fib values in the host for later use */ + zdev->kzdev->fib.fmt0.isc = fib->fmt0.isc; + zdev->kzdev->fib.fmt0.aibv = fib->fmt0.aibv; + mutex_unlock(&aift.lock); + + /* Issue the clp to setup the irq now */ + rc = kvm_zpci_set_airq(zdev); + return rc; + +unpin2: + mutex_unlock(&aift.lock); + if (fib->fmt0.sum == 1) { + gaddr = page_to_virt(aisb_page); + kvm_release_pfn_dirty((u64)gaddr >> PAGE_SHIFT); + } +unpin1: + kvm_release_pfn_dirty(fib->fmt0.aibv >> PAGE_SHIFT); +out: + return rc; +} +EXPORT_SYMBOL_GPL(kvm_s390_pci_aif_enable); + +int kvm_s390_pci_aif_disable(struct zpci_dev *zdev) +{ + struct kvm_zdev *kzdev = zdev->kzdev; + struct zpci_gaite *gaite; + int rc; + u8 isc; + + if (zdev->gd == 0) + return -EINVAL; + + /* Even if the clear fails due to an error, clear the GAITE */ + rc = kvm_zpci_clear_airq(zdev); + + mutex_lock(&aift.lock); + if (zdev->kzdev->fib.fmt0.aibv == 0) + goto out; + spin_lock_irq(&aift.gait_lock); + gaite = (struct zpci_gaite *) aift.gait + (zdev->aisb * + sizeof(struct zpci_gaite)); + isc = gaite->gisc; + gaite->count--; + if (gaite->count == 0) { + /* Release guest AIBV and AISB */ + kvm_release_pfn_dirty(kzdev->fib.fmt0.aibv >> PAGE_SHIFT); + if (gaite->aisb != 0) + kvm_release_pfn_dirty(gaite->aisb >> PAGE_SHIFT); + /* Clear the GAIT entry */ + gaite->aisb = 0; + gaite->gisc = 0; + gaite->aisbo = 0; + gaite->gisa = 0; + aift.kzdev[zdev->aisb] = 0; + /* Clear zdev info */ + airq_iv_free_bit(aift.sbv, zdev->aisb); + airq_iv_release(zdev->aibv); + zdev->aisb = 0; + zdev->aibv = NULL; + } + spin_unlock_irq(&aift.gait_lock); + kvm_s390_gisc_unregister(kzdev->kvm, isc); + kzdev->fib.fmt0.isc = 0; + kzdev->fib.fmt0.aibv = 0; +out: + mutex_unlock(&aift.lock); + + return rc; +} +EXPORT_SYMBOL_GPL(kvm_s390_pci_aif_disable); + int kvm_s390_pci_interp_probe(struct zpci_dev *zdev) { if (!(sclp.has_zpci_interp && test_facility(69))) @@ -188,6 +383,10 @@ int kvm_s390_pci_interp_disable(struct zpci_dev *zdev) if (zdev->gd == 0) return -EINVAL; + /* Forwarding must be turned off before interpretation */ + if (zdev->kzdev->fib.fmt0.aibv != 0) + kvm_s390_pci_aif_disable(zdev); + /* Remove the host CLP guest designation */ zdev->gd = 0; diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c index 0d1ab268ec24..b57d3f594113 100644 --- a/arch/s390/pci/pci_insn.c +++ b/arch/s390/pci/pci_insn.c @@ -59,6 +59,7 @@ u8 zpci_mod_fc(u64 req, struct zpci_fib *fib, u8 *status) return cc; } +EXPORT_SYMBOL_GPL(zpci_mod_fc); /* Refresh PCI Translations */ static inline u8 __rpcit(u64 fn, u64 addr, u64 range, u8 *status) -- 2.27.0