s390x/pci: enable adapter event notification for interpreted devices

Use the associated kvm ioctl operation to enable adapter event notification
and forwarding for devices when requested.  This feature will be set up
with or without firmware assist based upon the 'forwarding_assist' setting.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Message-Id: <20220902172737.170349-6-mjrosato@linux.ibm.com>
[thuth: Rename "forwarding_assist" property to "forwarding-assist"]
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 816d17af995a4f20cd1f346a39771c6c4abe6dc2..2f199739130b8d40a5c66848b84b3c710d5ba227 100644 (file)
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -190,7 +190,10 @@ void s390_pci_sclp_deconfigure(SCCB *sccb)
         rc = SCLP_RC_NO_ACTION_REQUIRED;
         break;
     default:
-        if (pbdev->summary_ind) {
+        if (pbdev->interp && (pbdev->fh & FH_MASK_ENABLE)) {
+            /* Interpreted devices were using interrupt forwarding */
+            s390_pci_kvm_aif_disable(pbdev);
+        } else if (pbdev->summary_ind) {
             pci_dereg_irqs(pbdev);
         }
         if (pbdev->iommu->enabled) {
@@ -1082,6 +1085,7 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
                 } else {
                     DPRINTF("zPCI interpretation facilities missing.\n");
                     pbdev->interp = false;
+                    pbdev->forwarding_assist = false;
                 }
             }
             pbdev->iommu->dma_limit = s390_pci_start_dma_count(s, pbdev);
@@ -1090,11 +1094,13 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
             if (!pbdev->interp) {
                 /* Do vfio passthrough but intercept for I/O */
                 pbdev->fh |= FH_SHM_VFIO;
+                pbdev->forwarding_assist = false;
             }
         } else {
             pbdev->fh |= FH_SHM_EMUL;
             /* Always intercept emulated devices */
             pbdev->interp = false;
+            pbdev->forwarding_assist = false;
         }
 
         if (s390_pci_msix_init(pbdev) && !pbdev->interp) {
@@ -1244,7 +1250,10 @@ static void s390_pcihost_reset(DeviceState *dev)
     /* Process all pending unplug requests */
     QTAILQ_FOREACH_SAFE(pbdev, &s->zpci_devs, link, next) {
         if (pbdev->unplug_requested) {
-            if (pbdev->summary_ind) {
+            if (pbdev->interp && (pbdev->fh & FH_MASK_ENABLE)) {
+                /* Interpreted devices were using interrupt forwarding */
+                s390_pci_kvm_aif_disable(pbdev);
+            } else if (pbdev->summary_ind) {
                 pci_dereg_irqs(pbdev);
             }
             if (pbdev->iommu->enabled) {
@@ -1382,7 +1391,10 @@ static void s390_pci_device_reset(DeviceState *dev)
         break;
     }
 
-    if (pbdev->summary_ind) {
+    if (pbdev->interp && (pbdev->fh & FH_MASK_ENABLE)) {
+        /* Interpreted devices were using interrupt forwarding */
+        s390_pci_kvm_aif_disable(pbdev);
+    } else if (pbdev->summary_ind) {
         pci_dereg_irqs(pbdev);
     }
     if (pbdev->iommu->enabled) {
@@ -1428,6 +1440,8 @@ static Property s390_pci_device_properties[] = {
     DEFINE_PROP_S390_PCI_FID("fid", S390PCIBusDevice, fid),
     DEFINE_PROP_STRING("target", S390PCIBusDevice, target),
     DEFINE_PROP_BOOL("interpret", S390PCIBusDevice, interp, true),
+    DEFINE_PROP_BOOL("forwarding-assist", S390PCIBusDevice, forwarding_assist,
+                     true),
     DEFINE_PROP_END_OF_LIST(),
 };
 

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 651ec3863506fde22af2432ac244082ab20be873..20a9bcc7afbb053ccada103a150fff5cd5a4ac61 100644 (file)
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -1066,6 +1066,32 @@ static void fmb_update(void *opaque)
     timer_mod(pbdev->fmb_timer, t + pbdev->pci_group->zpci_group.mui);
 }
 
+static int mpcifc_reg_int_interp(S390PCIBusDevice *pbdev, ZpciFib *fib)
+{
+    int rc;
+
+    rc = s390_pci_kvm_aif_enable(pbdev, fib, pbdev->forwarding_assist);
+    if (rc) {
+        DPRINTF("Failed to enable interrupt forwarding\n");
+        return rc;
+    }
+
+    return 0;
+}
+
+static int mpcifc_dereg_int_interp(S390PCIBusDevice *pbdev, ZpciFib *fib)
+{
+    int rc;
+
+    rc = s390_pci_kvm_aif_disable(pbdev);
+    if (rc) {
+        DPRINTF("Failed to disable interrupt forwarding\n");
+        return rc;
+    }
+
+    return 0;
+}
+
 int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
                         uintptr_t ra)
 {
@@ -1120,7 +1146,12 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
 
     switch (oc) {
     case ZPCI_MOD_FC_REG_INT:
-        if (pbdev->summary_ind) {
+        if (pbdev->interp) {
+            if (mpcifc_reg_int_interp(pbdev, &fib)) {
+                cc = ZPCI_PCI_LS_ERR;
+                s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
+            }
+        } else if (pbdev->summary_ind) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else if (reg_irqs(env, pbdev, fib)) {
@@ -1129,7 +1160,12 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
         }
         break;
     case ZPCI_MOD_FC_DEREG_INT:
-        if (!pbdev->summary_ind) {
+        if (pbdev->interp) {
+            if (mpcifc_dereg_int_interp(pbdev, &fib)) {
+                cc = ZPCI_PCI_LS_ERR;
+                s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
+            }
+        } else if (!pbdev->summary_ind) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else {

diff --git a/hw/s390x/s390-pci-kvm.c b/hw/s390x/s390-pci-kvm.c
index 0f16104a74c3856b5afdd433090750f4ca6ba4b2..9134fe185fea14aa13ccea4e3a17d2540294b99a 100644 (file)
--- a/hw/s390x/s390-pci-kvm.c
+++ b/hw/s390x/s390-pci-kvm.c
@@ -11,12 +11,42 @@
 
 #include "qemu/osdep.h"
 
+#include <linux/kvm.h>
+
 #include "kvm/kvm_s390x.h"
 #include "hw/s390x/pv.h"
+#include "hw/s390x/s390-pci-bus.h"
 #include "hw/s390x/s390-pci-kvm.h"
+#include "hw/s390x/s390-pci-inst.h"
 #include "cpu_models.h"
 
 bool s390_pci_kvm_interp_allowed(void)
 {
     return kvm_s390_get_zpci_op() && !s390_is_pv();
 }
+
+int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist)
+{
+    struct kvm_s390_zpci_op args = {
+        .fh = pbdev->fh,
+        .op = KVM_S390_ZPCIOP_REG_AEN,
+        .u.reg_aen.ibv = fib->aibv,
+        .u.reg_aen.sb = fib->aisb,
+        .u.reg_aen.noi = FIB_DATA_NOI(fib->data),
+        .u.reg_aen.isc = FIB_DATA_ISC(fib->data),
+        .u.reg_aen.sbo = FIB_DATA_AISBO(fib->data),
+        .u.reg_aen.flags = (assist) ? 0 : KVM_S390_ZPCIOP_REGAEN_HOST
+    };
+
+    return kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
+}
+
+int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev)
+{
+    struct kvm_s390_zpci_op args = {
+        .fh = pbdev->fh,
+        .op = KVM_S390_ZPCIOP_DEREG_AEN
+    };
+
+    return kvm_vm_ioctl(kvm_state, KVM_S390_ZPCI_OP, &args);
+}

diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index a9843dfe97d91e72f579acfefc106c5ac5266db7..5b09f0cf2fd440ae787c98387f793acc351ac6c2 100644 (file)
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -351,6 +351,7 @@ struct S390PCIBusDevice {
     bool pci_unplug_request_processed;
     bool unplug_requested;
     bool interp;
+    bool forwarding_assist;
     QTAILQ_ENTRY(S390PCIBusDevice) link;
 };
 

diff --git a/include/hw/s390x/s390-pci-kvm.h b/include/hw/s390x/s390-pci-kvm.h
index 80a2e7d0caf63d50693f3a923575e1930b62d90f..933814a4025bb050af9d5a675d4f8a52f8eced33 100644 (file)
--- a/include/hw/s390x/s390-pci-kvm.h
+++ b/include/hw/s390x/s390-pci-kvm.h
@@ -12,13 +12,27 @@
 #ifndef HW_S390_PCI_KVM_H
 #define HW_S390_PCI_KVM_H
 
+#include "hw/s390x/s390-pci-bus.h"
+#include "hw/s390x/s390-pci-inst.h"
+
 #ifdef CONFIG_KVM
 bool s390_pci_kvm_interp_allowed(void);
+int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib, bool assist);
+int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev);
 #else
 static inline bool s390_pci_kvm_interp_allowed(void)
 {
     return false;
 }
+static inline int s390_pci_kvm_aif_enable(S390PCIBusDevice *pbdev, ZpciFib *fib,
+                                          bool assist)
+{
+    return -EINVAL;
+}
+static inline int s390_pci_kvm_aif_disable(S390PCIBusDevice *pbdev)
+{
+    return -EINVAL;
+}
 #endif
 
 #endif