[PATCH v6 00/15] s390x/pci: Implement migration for emulated devices

[PATCH v6 00/15] s390x/pci: Implement migration for emulated devices

[Konstantin Shkolnyy]

Up until now QEMU marked any zPCI device as "unmigratable."

This patch series adds support for migrating emulated devices, which are
simpler to migrate. It leaves VFIO devices still unmigratable.

To enable migration, the device state needs to be saved/restored to/from
the migration stream.

There are 2 kinds of emulated devices - those that use the zPCI IOMMU page
table emulation in QEMU (e.g., Intel IGB NIC), and those that don't (virtio).
This is important to note for testing purposes.

This change was tested on IGB, virtio-net and virtio-blk devices by running
I/O on them while performing "virsh managedsave, virsh start" and also live
migration to another host and back.

Changes in v6:
 - patch 14: Instead of blocking migration just because s390-pcihost exists, block it only if actual PCI devices exist.

Konstantin Shkolnyy (14):
  s390x/pci: Create function to contain translation status check
  s390x/pci: Move iommu_mr from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move dm_mr from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move iotlb from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Remove a ptr to S390PCIBusDevice from S390PCIIOMMU
  s390x/pci: Move/rename enabled from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move dma_limit from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move g_iota from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move pba from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move pal from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Move max_dma_limit from S390PCIIOMMU to S390PCIBusDevice
  s390x/pci: Add a comment explaining S390PCIIOMMU purpose
  s390x/pci: Implement migration for emulated devices
  s390x/pci: Create function to contain fmb_timer start

Matthew Rosato (1):
  s390x/pci: implement IOMMU replay

 hw/s390x/s390-pci-bus.c          | 347 ++++++++++++++++++++++++++-----
 hw/s390x/s390-pci-inst.c         | 120 ++++++-----
 hw/s390x/s390-pci-vfio.c         |   4 +-
 hw/s390x/s390-virtio-ccw.c       |   4 +
 include/hw/s390x/s390-pci-bus.h  |  42 ++--
 include/hw/s390x/s390-pci-inst.h |   3 +-
 6 files changed, 393 insertions(+), 127 deletions(-)

-- 
2.34.1

[PATCH v6 01/15] s390x/pci: implement IOMMU replay

[Konstantin Shkolnyy]

From: Matthew Rosato <mjrosato@linux.ibm.com>

There are a few scenarios where IOMMU replay can potentially be needed
for zPCI device, namely VFIO device reset scenarios where the guest
continues running and expects the contents of its IOMMU to be replayed
upon IOAT re-registration and migration scenarios where the destination
must reconstruct the IOMMU on the destination.

zPCI migration is not supported yet, but the IOMMU replay function is
implemented so that it can be called both from IOMMUMemoryRegionClass
now and migration post_load later.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c          | 63 +++++++++++++++++++++++++++++---
 hw/s390x/s390-pci-inst.c         |  4 +-
 include/hw/s390x/s390-pci-inst.h |  1 +
 3 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index eff980fdfe..21bca4d787 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -593,14 +593,65 @@ err:
     return ret;
 }
 
-static void s390_pci_iommu_replay(IOMMUMemoryRegion *iommu,
+static void s390_pci_ioat_replay(S390PCIIOMMU *iommu)
+{
+    S390PCIBusDevice *pbdev = iommu->pbdev;
+    S390IOTLBEntry entry;
+    uint16_t error = 0;
+    uint32_t dma_avail;
+    hwaddr curr, end;
+
+    curr = iommu->pba;
+    end = iommu->pal;
+
+    if (iommu->dm_mr || !pbdev) {
+        /* If direct mapping is used, there are no guest tables to replay */
+        return;
+    }
+
+    if (iommu->dma_limit) {
+        dma_avail = iommu->dma_limit->avail;
+    } else {
+        dma_avail = 1;
+    }
+
+    while (curr < end) {
+        error = s390_guest_io_table_walk(iommu->g_iota, curr, &entry);
+        if (error) {
+            pbdev->state = ZPCI_FS_ERROR;
+            s390_pci_generate_error_event(error, pbdev->fh, pbdev->fid, curr,
+                                          0);
+            error_report("Failure to walk table during iommu remap");
+            return;
+        }
+
+        if (entry.perm != IOMMU_NONE) {
+            if (dma_avail > 0) {
+                dma_avail = s390_pci_update_iotlb(iommu, &entry);
+            } else {
+                /*
+                 * There is no reliable method to request the guest to release
+                 * mappings other than in response to a RPCIT instruction;
+                 * generate a permanent error condition and require the device
+                 * to be completely re-initialized from the guest side.
+                 */
+                pbdev->state = ZPCI_FS_ERROR;
+                s390_pci_generate_error_event(ERR_EVENT_PERMERR, pbdev->fh,
+                                              pbdev->fid, 0, 0);
+                error_report("DMA mappings exhausted: iommu remap failed");
+                return;
+            }
+        }
+        curr += entry.len;
+    }
+}
+
+static void s390_pci_iommu_replay(IOMMUMemoryRegion *mr,
                                   IOMMUNotifier *notifier)
 {
-    /* It's impossible to plug a pci device on s390x that already has iommu
-     * mappings which need to be replayed, that is due to the "one iommu per
-     * zpci device" construct. But when we support migration of vfio-pci
-     * devices in future, we need to revisit this.
-     */
+    S390PCIIOMMU *iommu = container_of(mr, S390PCIIOMMU, iommu_mr);
+
+    s390_pci_ioat_replay(iommu);
 }
 
 static S390PCIIOMMU *s390_pci_get_iommu(S390pciState *s, PCIBus *bus,
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index b7de23c7d2..37ca70dcf1 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -630,8 +630,8 @@ int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     return 0;
 }
 
-static uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu,
-                                      S390IOTLBEntry *entry)
+uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu,
+                               S390IOTLBEntry *entry)
 {
     S390IOTLBEntry *cache = g_hash_table_lookup(iommu->iotlb, &entry->iova);
     IOMMUTLBEvent event = {
diff --git a/include/hw/s390x/s390-pci-inst.h b/include/hw/s390x/s390-pci-inst.h
index 5cb8da540b..c782990e3b 100644
--- a/include/hw/s390x/s390-pci-inst.h
+++ b/include/hw/s390x/s390-pci-inst.h
@@ -111,6 +111,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
 int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
                          uintptr_t ra);
 void fmb_timer_free(S390PCIBusDevice *pbdev);
+uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu, S390IOTLBEntry *entry);
 
 #define ZPCI_IO_BAR_MIN 0
 #define ZPCI_IO_BAR_MAX 5
-- 
2.34.1

[PATCH v6 02/15] s390x/pci: Create function to contain translation status check

[Konstantin Shkolnyy]

Make it more clear what the bit means, and the new function will be called
from yet another place in the future.

Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Farhan Ali<alifm@linux.ibm.com>
Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-inst.c        | 7 ++++++-
 include/hw/s390x/s390-pci-bus.h | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 37ca70dcf1..00a847f493 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -1021,6 +1021,11 @@ int pci_dereg_irqs(S390PCIBusDevice *pbdev)
     return 0;
 }
 
+bool s390_pci_is_translation_enabled(uint64_t g_iota)
+{
+    return ((g_iota >> 11) & 0x1) != 0; /* "T" bit */
+}
+
 static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
                     uintptr_t ra)
 {
@@ -1029,7 +1034,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
     uint64_t pal = ldq_be_p(&fib.pal);
     uint64_t g_iota = ldq_be_p(&fib.iota);
     uint8_t dt = (g_iota >> 2) & 0x7;
-    uint8_t t = (g_iota >> 11) & 0x1;
+    bool t = s390_pci_is_translation_enabled(g_iota);
 
     pba &= ~0xfff;
     pal |= 0xfff;
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 9228523ce8..eb15cb8b2d 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -390,6 +390,7 @@ int pci_chsc_sei_nt2_get_event(void *res);
 int pci_chsc_sei_nt2_have_event(void);
 void s390_pci_sclp_configure(SCCB *sccb);
 void s390_pci_sclp_deconfigure(SCCB *sccb);
+bool s390_pci_is_translation_enabled(uint64_t g_iota);
 void s390_pci_iommu_enable(S390PCIIOMMU *iommu);
 void s390_pci_iommu_direct_map_enable(S390PCIIOMMU *iommu);
 void s390_pci_iommu_disable(S390PCIIOMMU *iommu);
-- 
2.34.1

[PATCH v6 03/15] s390x/pci: Move iommu_mr from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>
Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c          | 35 +++++++++++++++++---------------
 hw/s390x/s390-pci-inst.c         | 28 +++++++++++++------------
 include/hw/s390x/s390-pci-bus.h  |  6 +++---
 include/hw/s390x/s390-pci-inst.h |  4 ++--
 4 files changed, 39 insertions(+), 34 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 21bca4d787..d6641c635c 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -207,7 +207,7 @@ void s390_pci_sclp_deconfigure(SCCB *sccb)
             pci_dereg_irqs(pbdev);
         }
         if (pbdev->iommu->enabled) {
-            pci_dereg_ioat(pbdev->iommu);
+            pci_dereg_ioat(pbdev);
         }
         pbdev->state = ZPCI_FS_STANDBY;
         rc = SCLP_RC_NORMAL_COMPLETION;
@@ -539,7 +539,8 @@ uint16_t s390_guest_io_table_walk(uint64_t g_iota, hwaddr addr,
 static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
                                           IOMMUAccessFlags flag, int iommu_idx)
 {
-    S390PCIIOMMU *iommu = container_of(mr, S390PCIIOMMU, iommu_mr);
+    S390PCIBusDevice *pbdev = container_of(mr, S390PCIBusDevice, iommu_mr);
+    S390PCIIOMMU *iommu = pbdev->iommu;
     S390IOTLBEntry *entry;
     uint64_t iova = addr & TARGET_PAGE_MASK;
     uint16_t error = 0;
@@ -593,18 +594,18 @@ err:
     return ret;
 }
 
-static void s390_pci_ioat_replay(S390PCIIOMMU *iommu)
+static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
 {
-    S390PCIBusDevice *pbdev = iommu->pbdev;
     S390IOTLBEntry entry;
     uint16_t error = 0;
     uint32_t dma_avail;
     hwaddr curr, end;
+    S390PCIIOMMU *iommu = pbdev->iommu;
 
     curr = iommu->pba;
     end = iommu->pal;
 
-    if (iommu->dm_mr || !pbdev) {
+    if (iommu->dm_mr) {
         /* If direct mapping is used, there are no guest tables to replay */
         return;
     }
@@ -627,7 +628,7 @@ static void s390_pci_ioat_replay(S390PCIIOMMU *iommu)
 
         if (entry.perm != IOMMU_NONE) {
             if (dma_avail > 0) {
-                dma_avail = s390_pci_update_iotlb(iommu, &entry);
+                dma_avail = s390_pci_update_iotlb(pbdev, &entry);
             } else {
                 /*
                  * There is no reliable method to request the guest to release
@@ -649,9 +650,9 @@ static void s390_pci_ioat_replay(S390PCIIOMMU *iommu)
 static void s390_pci_iommu_replay(IOMMUMemoryRegion *mr,
                                   IOMMUNotifier *notifier)
 {
-    S390PCIIOMMU *iommu = container_of(mr, S390PCIIOMMU, iommu_mr);
+    S390PCIBusDevice *pbdev = container_of(mr, S390PCIBusDevice, iommu_mr);
 
-    s390_pci_ioat_replay(iommu);
+    s390_pci_ioat_replay(pbdev);
 }
 
 static S390PCIIOMMU *s390_pci_get_iommu(S390pciState *s, PCIBus *bus,
@@ -773,19 +774,20 @@ static const MemoryRegionOps s390_msi_ctrl_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
-void s390_pci_iommu_enable(S390PCIIOMMU *iommu)
+void s390_pci_iommu_enable(S390PCIBusDevice *pbdev)
 {
+    S390PCIIOMMU *iommu = pbdev->iommu;
     /*
      * The iommu region is initialized against a 0-mapped address space,
      * so the smallest IOMMU region we can define runs from 0 to the end
      * of the PCI address space.
      */
     char *name = g_strdup_printf("iommu-s390-%04x", iommu->pbdev->uid);
-    memory_region_init_iommu(&iommu->iommu_mr, sizeof(iommu->iommu_mr),
+    memory_region_init_iommu(&pbdev->iommu_mr, sizeof(pbdev->iommu_mr),
                              TYPE_S390_IOMMU_MEMORY_REGION, OBJECT(&iommu->mr),
                              name, iommu->pal + 1);
     iommu->enabled = true;
-    memory_region_add_subregion(&iommu->mr, 0, MEMORY_REGION(&iommu->iommu_mr));
+    memory_region_add_subregion(&iommu->mr, 0, MEMORY_REGION(&pbdev->iommu_mr));
     g_free(name);
 }
 
@@ -811,8 +813,9 @@ void s390_pci_iommu_direct_map_enable(S390PCIIOMMU *iommu)
                                 iommu->dm_mr);
 }
 
-void s390_pci_iommu_disable(S390PCIIOMMU *iommu)
+void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
 {
+    S390PCIIOMMU *iommu = pbdev->iommu;
     iommu->enabled = false;
     g_hash_table_remove_all(iommu->iotlb);
     if (iommu->dm_mr) {
@@ -822,8 +825,8 @@ void s390_pci_iommu_disable(S390PCIIOMMU *iommu)
         iommu->dm_mr = NULL;
     } else {
         memory_region_del_subregion(&iommu->mr,
-                                    MEMORY_REGION(&iommu->iommu_mr));
-        object_unparent(OBJECT(&iommu->iommu_mr));
+                                    MEMORY_REGION(&pbdev->iommu_mr));
+        object_unparent(OBJECT(&pbdev->iommu_mr));
     }
 }
 
@@ -1422,7 +1425,7 @@ static void s390_pcihost_reset(DeviceState *dev)
                 pci_dereg_irqs(pbdev);
             }
             if (pbdev->iommu->enabled) {
-                pci_dereg_ioat(pbdev->iommu);
+                pci_dereg_ioat(pbdev);
             }
             pbdev->state = ZPCI_FS_STANDBY;
             s390_pci_perform_unplug(pbdev);
@@ -1563,7 +1566,7 @@ static void s390_pci_device_reset(DeviceState *dev)
         pci_dereg_irqs(pbdev);
     }
     if (pbdev->iommu->enabled) {
-        pci_dereg_ioat(pbdev->iommu);
+        pci_dereg_ioat(pbdev);
     }
 
     fmb_timer_free(pbdev);
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 00a847f493..0772f04cc2 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -630,9 +630,10 @@ int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     return 0;
 }
 
-uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu,
+uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
                                S390IOTLBEntry *entry)
 {
+    S390PCIIOMMU *iommu = pbdev->iommu;
     S390IOTLBEntry *cache = g_hash_table_lookup(iommu->iotlb, &entry->iova);
     IOMMUTLBEvent event = {
         .type = entry->perm ? IOMMU_NOTIFIER_MAP : IOMMU_NOTIFIER_UNMAP,
@@ -662,7 +663,7 @@ uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu,
 
             event.type = IOMMU_NOTIFIER_UNMAP;
             event.entry.perm = IOMMU_NONE;
-            memory_region_notify_iommu(&iommu->iommu_mr, 0, event);
+            memory_region_notify_iommu(&pbdev->iommu_mr, 0, event);
             event.type = IOMMU_NOTIFIER_MAP;
             event.entry.perm = entry->perm;
         }
@@ -680,13 +681,13 @@ uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu,
      * All associated iotlb entries have already been cleared, trigger the
      * unmaps.
      */
-    memory_region_notify_iommu(&iommu->iommu_mr, 0, event);
+    memory_region_notify_iommu(&pbdev->iommu_mr, 0, event);
 
 out:
     return iommu->dma_limit ? iommu->dma_limit->avail : 1;
 }
 
-static void s390_pci_batch_unmap(S390PCIIOMMU *iommu, uint64_t iova,
+static void s390_pci_batch_unmap(S390PCIBusDevice *pbdev, uint64_t iova,
                                  uint64_t len)
 {
     uint64_t remain = len, start = iova, end = start + len - 1, mask, size;
@@ -704,7 +705,7 @@ static void s390_pci_batch_unmap(S390PCIIOMMU *iommu, uint64_t iova,
         size = mask + 1;
         event.entry.iova = start;
         event.entry.addr_mask = mask;
-        memory_region_notify_iommu(&iommu->iommu_mr, 0, event);
+        memory_region_notify_iommu(&pbdev->iommu_mr, 0, event);
         start += size;
         remain -= size;
     }
@@ -801,14 +802,14 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
             coalesce += entry.len;
         } else if (coalesce > 0) {
             /* Unleash the coalesced unmap before processing a new map */
-            s390_pci_batch_unmap(iommu, iova, coalesce);
+            s390_pci_batch_unmap(pbdev, iova, coalesce);
             coalesce = 0;
         }
 
         start += entry.len;
         while (entry.iova < start && entry.iova < end) {
             if (dma_avail > 0 || entry.perm == IOMMU_NONE) {
-                dma_avail = s390_pci_update_iotlb(iommu, &entry);
+                dma_avail = s390_pci_update_iotlb(pbdev, &entry);
                 entry.iova += TARGET_PAGE_SIZE;
                 entry.translated_addr += TARGET_PAGE_SIZE;
             } else {
@@ -824,7 +825,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     }
     if (coalesce) {
             /* Unleash the coalesced unmap before finishing rpcit */
-            s390_pci_batch_unmap(iommu, iova, coalesce);
+            s390_pci_batch_unmap(pbdev, iova, coalesce);
             coalesce = 0;
     }
     if (again && dma_avail > 0)
@@ -1059,7 +1060,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
     iommu->g_iota = g_iota;
 
     if (t) {
-        s390_pci_iommu_enable(iommu);
+        s390_pci_iommu_enable(pbdev);
     } else {
         s390_pci_iommu_direct_map_enable(iommu);
     }
@@ -1067,9 +1068,10 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
     return 0;
 }
 
-void pci_dereg_ioat(S390PCIIOMMU *iommu)
+void pci_dereg_ioat(S390PCIBusDevice *pbdev)
 {
-    s390_pci_iommu_disable(iommu);
+    S390PCIIOMMU *iommu = pbdev->iommu;
+    s390_pci_iommu_disable(pbdev);
     iommu->pba = 0;
     iommu->pal = 0;
     iommu->g_iota = 0;
@@ -1293,7 +1295,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else {
-            pci_dereg_ioat(pbdev->iommu);
+            pci_dereg_ioat(pbdev);
         }
         break;
     case ZPCI_MOD_FC_REREG_IOAT:
@@ -1304,7 +1306,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else {
-            pci_dereg_ioat(pbdev->iommu);
+            pci_dereg_ioat(pbdev);
             if (reg_ioat(env, pbdev, fib, ra)) {
                 cc = ZPCI_PCI_LS_ERR;
                 s390_set_status_code(env, r1, ZPCI_MOD_ST_INSUF_RES);
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index eb15cb8b2d..a71f562dfc 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -276,7 +276,6 @@ struct S390PCIIOMMU {
     S390PCIBusDevice *pbdev;
     AddressSpace as;
     MemoryRegion mr;
-    IOMMUMemoryRegion iommu_mr;
     MemoryRegion *dm_mr;
     bool enabled;
     uint64_t g_iota;
@@ -354,6 +353,7 @@ struct S390PCIBusDevice {
     S390MsixInfo msix;
     AdapterRoutes routes;
     S390PCIIOMMU *iommu;
+    IOMMUMemoryRegion iommu_mr;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
     IndAddr *indicator;
@@ -391,9 +391,9 @@ int pci_chsc_sei_nt2_have_event(void);
 void s390_pci_sclp_configure(SCCB *sccb);
 void s390_pci_sclp_deconfigure(SCCB *sccb);
 bool s390_pci_is_translation_enabled(uint64_t g_iota);
-void s390_pci_iommu_enable(S390PCIIOMMU *iommu);
+void s390_pci_iommu_enable(S390PCIBusDevice *pbdev);
 void s390_pci_iommu_direct_map_enable(S390PCIIOMMU *iommu);
-void s390_pci_iommu_disable(S390PCIIOMMU *iommu);
+void s390_pci_iommu_disable(S390PCIBusDevice *pbdev);
 void s390_pci_generate_error_event(uint16_t pec, uint32_t fh, uint32_t fid,
                                    uint64_t faddr, uint32_t e);
 uint16_t s390_guest_io_table_walk(uint64_t g_iota, hwaddr addr,
diff --git a/include/hw/s390x/s390-pci-inst.h b/include/hw/s390x/s390-pci-inst.h
index c782990e3b..38268c256e 100644
--- a/include/hw/s390x/s390-pci-inst.h
+++ b/include/hw/s390x/s390-pci-inst.h
@@ -99,7 +99,7 @@ typedef struct ZpciFib {
 } QEMU_PACKED ZpciFib;
 
 int pci_dereg_irqs(S390PCIBusDevice *pbdev);
-void pci_dereg_ioat(S390PCIIOMMU *iommu);
+void pci_dereg_ioat(S390PCIBusDevice *pbdev);
 int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra);
 int pcilg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra);
 int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra);
@@ -111,7 +111,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
 int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
                          uintptr_t ra);
 void fmb_timer_free(S390PCIBusDevice *pbdev);
-uint32_t s390_pci_update_iotlb(S390PCIIOMMU *iommu, S390IOTLBEntry *entry);
+uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev, S390IOTLBEntry *entry);
 
 #define ZPCI_IO_BAR_MIN 0
 #define ZPCI_IO_BAR_MAX 5
-- 
2.34.1

[PATCH v6 04/15] s390x/pci: Move dm_mr from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>
Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         | 21 +++++++++++----------
 hw/s390x/s390-pci-inst.c        |  2 +-
 include/hw/s390x/s390-pci-bus.h |  4 ++--
 3 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index d6641c635c..5c551196bf 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -605,7 +605,7 @@ static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
     curr = iommu->pba;
     end = iommu->pal;
 
-    if (iommu->dm_mr) {
+    if (pbdev->dm_mr) {
         /* If direct mapping is used, there are no guest tables to replay */
         return;
     }
@@ -791,8 +791,9 @@ void s390_pci_iommu_enable(S390PCIBusDevice *pbdev)
     g_free(name);
 }
 
-void s390_pci_iommu_direct_map_enable(S390PCIIOMMU *iommu)
+void s390_pci_iommu_direct_map_enable(S390PCIBusDevice *pbdev)
 {
+    S390PCIIOMMU *iommu = pbdev->iommu;
     MachineState *ms = MACHINE(qdev_get_machine());
     S390CcwMachineState *s390ms = S390_CCW_MACHINE(ms);
 
@@ -804,13 +805,13 @@ void s390_pci_iommu_direct_map_enable(S390PCIIOMMU *iommu)
     g_autofree char *name = g_strdup_printf("iommu-dm-s390-%04x",
                                             iommu->pbdev->uid);
 
-    iommu->dm_mr = g_malloc0(sizeof(*iommu->dm_mr));
-    memory_region_init_alias(iommu->dm_mr, OBJECT(&iommu->mr), name,
+    pbdev->dm_mr = g_malloc0(sizeof(*pbdev->dm_mr));
+    memory_region_init_alias(pbdev->dm_mr, OBJECT(&iommu->mr), name,
                              get_system_memory(), 0,
                              s390_get_memory_limit(s390ms));
     iommu->enabled = true;
     memory_region_add_subregion(&iommu->mr, iommu->pbdev->zpci_fn.sdma,
-                                iommu->dm_mr);
+                                pbdev->dm_mr);
 }
 
 void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
@@ -818,11 +819,11 @@ void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
     S390PCIIOMMU *iommu = pbdev->iommu;
     iommu->enabled = false;
     g_hash_table_remove_all(iommu->iotlb);
-    if (iommu->dm_mr) {
-        memory_region_del_subregion(&iommu->mr, iommu->dm_mr);
-        object_unparent(OBJECT(iommu->dm_mr));
-        g_free(iommu->dm_mr);
-        iommu->dm_mr = NULL;
+    if (pbdev->dm_mr) {
+        memory_region_del_subregion(&iommu->mr, pbdev->dm_mr);
+        object_unparent(OBJECT(pbdev->dm_mr));
+        g_free(pbdev->dm_mr);
+        pbdev->dm_mr = NULL;
     } else {
         memory_region_del_subregion(&iommu->mr,
                                     MEMORY_REGION(&pbdev->iommu_mr));
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 0772f04cc2..582e93a741 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -1062,7 +1062,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
     if (t) {
         s390_pci_iommu_enable(pbdev);
     } else {
-        s390_pci_iommu_direct_map_enable(iommu);
+        s390_pci_iommu_direct_map_enable(pbdev);
     }
 
     return 0;
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index a71f562dfc..f310672584 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -276,7 +276,6 @@ struct S390PCIIOMMU {
     S390PCIBusDevice *pbdev;
     AddressSpace as;
     MemoryRegion mr;
-    MemoryRegion *dm_mr;
     bool enabled;
     uint64_t g_iota;
     uint64_t pba;
@@ -354,6 +353,7 @@ struct S390PCIBusDevice {
     AdapterRoutes routes;
     S390PCIIOMMU *iommu;
     IOMMUMemoryRegion iommu_mr;
+    MemoryRegion *dm_mr;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
     IndAddr *indicator;
@@ -392,7 +392,7 @@ void s390_pci_sclp_configure(SCCB *sccb);
 void s390_pci_sclp_deconfigure(SCCB *sccb);
 bool s390_pci_is_translation_enabled(uint64_t g_iota);
 void s390_pci_iommu_enable(S390PCIBusDevice *pbdev);
-void s390_pci_iommu_direct_map_enable(S390PCIIOMMU *iommu);
+void s390_pci_iommu_direct_map_enable(S390PCIBusDevice *pbdev);
 void s390_pci_iommu_disable(S390PCIBusDevice *pbdev);
 void s390_pci_generate_error_event(uint16_t pec, uint32_t fh, uint32_t fid,
                                    uint64_t faddr, uint32_t e);
-- 
2.34.1

[PATCH v6 05/15] s390x/pci: Move iotlb from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         | 10 +++++-----
 hw/s390x/s390-pci-inst.c        |  6 +++---
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 5c551196bf..a08f226ef8 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -570,7 +570,7 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
         goto err;
     }
 
-    entry = g_hash_table_lookup(iommu->iotlb, &iova);
+    entry = g_hash_table_lookup(pbdev->iotlb, &iova);
     if (entry) {
         ret.iova = entry->iova;
         ret.translated_addr = entry->translated_addr;
@@ -682,8 +682,6 @@ static S390PCIIOMMU *s390_pci_get_iommu(S390pciState *s, PCIBus *bus,
                                         PCI_FUNC(devfn));
         memory_region_init(&iommu->mr, OBJECT(iommu), mr_name, UINT64_MAX);
         address_space_init(&iommu->as, &iommu->mr, as_name);
-        iommu->iotlb = g_hash_table_new_full(g_int64_hash, g_int64_equal,
-                                             NULL, g_free);
         table->iommu[PCI_SLOT(devfn)] = iommu;
 
         g_free(mr_name);
@@ -818,7 +816,7 @@ void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
 {
     S390PCIIOMMU *iommu = pbdev->iommu;
     iommu->enabled = false;
-    g_hash_table_remove_all(iommu->iotlb);
+    g_hash_table_remove_all(pbdev->iotlb);
     if (pbdev->dm_mr) {
         memory_region_del_subregion(&iommu->mr, pbdev->dm_mr);
         object_unparent(OBJECT(pbdev->dm_mr));
@@ -842,7 +840,6 @@ static void s390_pci_iommu_free(S390pciState *s, PCIBus *bus, int32_t devfn)
     }
 
     table->iommu[PCI_SLOT(devfn)] = NULL;
-    g_hash_table_destroy(iommu->iotlb);
     /*
      * An attached PCI device may have memory listeners, eg. VFIO PCI.
      * The associated subregion will already have been unmapped in
@@ -1264,6 +1261,8 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
         /* the allocated idx is actually getting used */
         s->next_idx = (pbdev->idx + 1) & FH_MASK_INDEX;
         pbdev->fh = pbdev->idx;
+        pbdev->iotlb = g_hash_table_new_full(g_int64_hash, g_int64_equal,
+                                             NULL, g_free);
         QTAILQ_INSERT_TAIL(&s->zpci_devs, pbdev, link);
         g_hash_table_insert(s->zpci_table, &pbdev->idx, pbdev);
     } else {
@@ -1306,6 +1305,7 @@ static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
         if (pbdev->iommu && pbdev->iommu->dma_limit) {
             s390_pci_end_dma_count(s, pbdev->iommu->dma_limit);
         }
+        g_hash_table_destroy(pbdev->iotlb);
         qdev_unrealize(dev);
     }
 }
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 582e93a741..f648afb401 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -634,7 +634,7 @@ uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
                                S390IOTLBEntry *entry)
 {
     S390PCIIOMMU *iommu = pbdev->iommu;
-    S390IOTLBEntry *cache = g_hash_table_lookup(iommu->iotlb, &entry->iova);
+    S390IOTLBEntry *cache = g_hash_table_lookup(pbdev->iotlb, &entry->iova);
     IOMMUTLBEvent event = {
         .type = entry->perm ? IOMMU_NOTIFIER_MAP : IOMMU_NOTIFIER_UNMAP,
         .entry = {
@@ -650,7 +650,7 @@ uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
         if (!cache) {
             goto out;
         }
-        g_hash_table_remove(iommu->iotlb, &entry->iova);
+        g_hash_table_remove(pbdev->iotlb, &entry->iova);
         inc_dma_avail(iommu);
         /* Don't notify the iommu yet, maybe we can bundle contiguous unmaps */
         goto out;
@@ -673,7 +673,7 @@ uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
         cache->translated_addr = entry->translated_addr;
         cache->len = TARGET_PAGE_SIZE;
         cache->perm = entry->perm;
-        g_hash_table_replace(iommu->iotlb, &cache->iova, cache);
+        g_hash_table_replace(pbdev->iotlb, &cache->iova, cache);
         dec_dma_avail(iommu);
     }
 
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index f310672584..d9bafd6859 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -281,7 +281,6 @@ struct S390PCIIOMMU {
     uint64_t pba;
     uint64_t pal;
     uint64_t max_dma_limit;
-    GHashTable *iotlb;
     S390PCIDMACount *dma_limit;
 };
 
@@ -354,6 +353,7 @@ struct S390PCIBusDevice {
     S390PCIIOMMU *iommu;
     IOMMUMemoryRegion iommu_mr;
     MemoryRegion *dm_mr;
+    GHashTable *iotlb;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
     IndAddr *indicator;
-- 
2.34.1

Re: [PATCH v6 05/15] s390x/pci: Move iotlb from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         | 10 +++++-----
>   hw/s390x/s390-pci-inst.c        |  6 +++---
>   include/hw/s390x/s390-pci-bus.h |  2 +-
>   3 files changed, 9 insertions(+), 9 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 06/15] s390x/pci: Remove a ptr to S390PCIBusDevice from S390PCIIOMMU

[Konstantin Shkolnyy]

This pointer is no longer used, after fields were moved from S390PCIIOMMU
to S390PCIBusDevice.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         | 15 +++++++--------
 include/hw/s390x/s390-pci-bus.h |  1 -
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index a08f226ef8..d2abbdab7f 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -552,7 +552,7 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
         .perm = IOMMU_NONE,
     };
 
-    switch (iommu->pbdev->state) {
+    switch (pbdev->state) {
     case ZPCI_FS_ENABLED:
     case ZPCI_FS_BLOCKED:
         if (!iommu->enabled) {
@@ -587,9 +587,9 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
     }
 err:
     if (error) {
-        iommu->pbdev->state = ZPCI_FS_ERROR;
-        s390_pci_generate_error_event(error, iommu->pbdev->fh,
-                                      iommu->pbdev->fid, addr, 0);
+        pbdev->state = ZPCI_FS_ERROR;
+        s390_pci_generate_error_event(error, pbdev->fh,
+                                      pbdev->fid, addr, 0);
     }
     return ret;
 }
@@ -780,7 +780,7 @@ void s390_pci_iommu_enable(S390PCIBusDevice *pbdev)
      * so the smallest IOMMU region we can define runs from 0 to the end
      * of the PCI address space.
      */
-    char *name = g_strdup_printf("iommu-s390-%04x", iommu->pbdev->uid);
+    char *name = g_strdup_printf("iommu-s390-%04x", pbdev->uid);
     memory_region_init_iommu(&pbdev->iommu_mr, sizeof(pbdev->iommu_mr),
                              TYPE_S390_IOMMU_MEMORY_REGION, OBJECT(&iommu->mr),
                              name, iommu->pal + 1);
@@ -801,14 +801,14 @@ void s390_pci_iommu_direct_map_enable(S390PCIBusDevice *pbdev)
      * IOVA X + SDMA.  VFIO will handle pinning via its memory listener.
      */
     g_autofree char *name = g_strdup_printf("iommu-dm-s390-%04x",
-                                            iommu->pbdev->uid);
+                                            pbdev->uid);
 
     pbdev->dm_mr = g_malloc0(sizeof(*pbdev->dm_mr));
     memory_region_init_alias(pbdev->dm_mr, OBJECT(&iommu->mr), name,
                              get_system_memory(), 0,
                              s390_get_memory_limit(s390ms));
     iommu->enabled = true;
-    memory_region_add_subregion(&iommu->mr, iommu->pbdev->zpci_fn.sdma,
+    memory_region_add_subregion(&iommu->mr, pbdev->zpci_fn.sdma,
                                 pbdev->dm_mr);
 }
 
@@ -1200,7 +1200,6 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
 
         pbdev->pdev = pdev;
         pbdev->iommu = s390_pci_get_iommu(s, pci_get_bus(pdev), pdev->devfn);
-        pbdev->iommu->pbdev = pbdev;
         pbdev->state = ZPCI_FS_DISABLED;
         set_pbdev_info(pbdev);
 
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index d9bafd6859..fcaaf19512 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -273,7 +273,6 @@ typedef struct S390PCIDMACount {
 
 struct S390PCIIOMMU {
     Object parent_obj;
-    S390PCIBusDevice *pbdev;
     AddressSpace as;
     MemoryRegion mr;
     bool enabled;
-- 
2.34.1

Re: [PATCH v6 06/15] s390x/pci: Remove a ptr to S390PCIBusDevice from S390PCIIOMMU

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This pointer is no longer used, after fields were moved from S390PCIIOMMU
> to S390PCIBusDevice.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         | 15 +++++++--------
>   include/hw/s390x/s390-pci-bus.h |  1 -
>   2 files changed, 7 insertions(+), 9 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 07/15] s390x/pci: Move/rename enabled from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

This also allows to save/restore this field during migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         | 14 +++++++-------
 hw/s390x/s390-pci-inst.c        |  8 ++++----
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index d2abbdab7f..586dafe1e5 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -206,7 +206,7 @@ void s390_pci_sclp_deconfigure(SCCB *sccb)
         } else if (pbdev->summary_ind) {
             pci_dereg_irqs(pbdev);
         }
-        if (pbdev->iommu->enabled) {
+        if (pbdev->iommu_enabled) {
             pci_dereg_ioat(pbdev);
         }
         pbdev->state = ZPCI_FS_STANDBY;
@@ -555,7 +555,7 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
     switch (pbdev->state) {
     case ZPCI_FS_ENABLED:
     case ZPCI_FS_BLOCKED:
-        if (!iommu->enabled) {
+        if (!pbdev->iommu_enabled) {
             return ret;
         }
         break;
@@ -784,7 +784,7 @@ void s390_pci_iommu_enable(S390PCIBusDevice *pbdev)
     memory_region_init_iommu(&pbdev->iommu_mr, sizeof(pbdev->iommu_mr),
                              TYPE_S390_IOMMU_MEMORY_REGION, OBJECT(&iommu->mr),
                              name, iommu->pal + 1);
-    iommu->enabled = true;
+    pbdev->iommu_enabled = true;
     memory_region_add_subregion(&iommu->mr, 0, MEMORY_REGION(&pbdev->iommu_mr));
     g_free(name);
 }
@@ -807,7 +807,7 @@ void s390_pci_iommu_direct_map_enable(S390PCIBusDevice *pbdev)
     memory_region_init_alias(pbdev->dm_mr, OBJECT(&iommu->mr), name,
                              get_system_memory(), 0,
                              s390_get_memory_limit(s390ms));
-    iommu->enabled = true;
+    pbdev->iommu_enabled = true;
     memory_region_add_subregion(&iommu->mr, pbdev->zpci_fn.sdma,
                                 pbdev->dm_mr);
 }
@@ -815,7 +815,7 @@ void s390_pci_iommu_direct_map_enable(S390PCIBusDevice *pbdev)
 void s390_pci_iommu_disable(S390PCIBusDevice *pbdev)
 {
     S390PCIIOMMU *iommu = pbdev->iommu;
-    iommu->enabled = false;
+    pbdev->iommu_enabled = false;
     g_hash_table_remove_all(pbdev->iotlb);
     if (pbdev->dm_mr) {
         memory_region_del_subregion(&iommu->mr, pbdev->dm_mr);
@@ -1424,7 +1424,7 @@ static void s390_pcihost_reset(DeviceState *dev)
             } else if (pbdev->summary_ind) {
                 pci_dereg_irqs(pbdev);
             }
-            if (pbdev->iommu->enabled) {
+            if (pbdev->iommu_enabled) {
                 pci_dereg_ioat(pbdev);
             }
             pbdev->state = ZPCI_FS_STANDBY;
@@ -1565,7 +1565,7 @@ static void s390_pci_device_reset(DeviceState *dev)
     } else if (pbdev->summary_ind) {
         pci_dereg_irqs(pbdev);
     }
-    if (pbdev->iommu->enabled) {
+    if (pbdev->iommu_enabled) {
         pci_dereg_ioat(pbdev);
     }
 
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index f648afb401..7081be4619 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -1279,7 +1279,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
         if (dmaas != 0) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_DMAAS_INVAL);
-        } else if (pbdev->iommu->enabled) {
+        } else if (pbdev->iommu_enabled) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else if (reg_ioat(env, pbdev, fib, ra)) {
@@ -1291,7 +1291,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
         if (dmaas != 0) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_DMAAS_INVAL);
-        } else if (!pbdev->iommu->enabled) {
+        } else if (!pbdev->iommu_enabled) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else {
@@ -1302,7 +1302,7 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
         if (dmaas != 0) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_DMAAS_INVAL);
-        } else if (!pbdev->iommu->enabled) {
+        } else if (!pbdev->iommu_enabled) {
             cc = ZPCI_PCI_LS_ERR;
             s390_set_status_code(env, r1, ZPCI_MOD_ST_SEQUENCE);
         } else {
@@ -1432,7 +1432,7 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
         /* fallthrough */
     case ZPCI_FS_ENABLED:
         fib.fc |= 0x80;
-        if (pbdev->iommu->enabled) {
+        if (pbdev->iommu_enabled) {
             fib.fc |= 0x10;
         }
         if (!(fh & FH_MASK_ENABLE)) {
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index fcaaf19512..24f6e60786 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -275,7 +275,6 @@ struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
     MemoryRegion mr;
-    bool enabled;
     uint64_t g_iota;
     uint64_t pba;
     uint64_t pal;
@@ -350,6 +349,7 @@ struct S390PCIBusDevice {
     S390MsixInfo msix;
     AdapterRoutes routes;
     S390PCIIOMMU *iommu;
+    bool iommu_enabled;
     IOMMUMemoryRegion iommu_mr;
     MemoryRegion *dm_mr;
     GHashTable *iotlb;
-- 
2.34.1

Re: [PATCH v6 07/15] s390x/pci: Move/rename enabled from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> This also allows to save/restore this field during migration.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         | 14 +++++++-------
>   hw/s390x/s390-pci-inst.c        |  8 ++++----
>   include/hw/s390x/s390-pci-bus.h |  2 +-
>   3 files changed, 12 insertions(+), 12 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 08/15] s390x/pci: Move dma_limit from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         | 10 +++++-----
 hw/s390x/s390-pci-inst.c        | 23 +++++++++++------------
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 586dafe1e5..04bb0271e6 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -610,8 +610,8 @@ static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
         return;
     }
 
-    if (iommu->dma_limit) {
-        dma_avail = iommu->dma_limit->avail;
+    if (pbdev->dma_limit) {
+        dma_avail = pbdev->dma_limit->avail;
     } else {
         dma_avail = 1;
     }
@@ -1223,7 +1223,7 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
                     pbdev->forwarding_assist = false;
                 }
             }
-            pbdev->iommu->dma_limit = s390_pci_start_dma_count(s, pbdev);
+            pbdev->dma_limit = s390_pci_start_dma_count(s, pbdev);
             /* Fill in CLP information passed via the vfio region */
             s390_pci_get_clp_info(pbdev);
             if (!pbdev->interp) {
@@ -1301,8 +1301,8 @@ static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
         pbdev->fid = 0;
         QTAILQ_REMOVE(&s->zpci_devs, pbdev, link);
         g_hash_table_remove(s->zpci_table, &pbdev->idx);
-        if (pbdev->iommu && pbdev->iommu->dma_limit) {
-            s390_pci_end_dma_count(s, pbdev->iommu->dma_limit);
+        if (pbdev->dma_limit) {
+            s390_pci_end_dma_count(s, pbdev->dma_limit);
         }
         g_hash_table_destroy(pbdev->iotlb);
         qdev_unrealize(dev);
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 7081be4619..dc52da41b5 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -28,17 +28,17 @@
 
 #include "trace.h"
 
-static inline void inc_dma_avail(S390PCIIOMMU *iommu)
+static inline void inc_dma_avail(S390PCIBusDevice *pbdev)
 {
-    if (iommu->dma_limit) {
-        iommu->dma_limit->avail++;
+    if (pbdev->dma_limit) {
+        pbdev->dma_limit->avail++;
     }
 }
 
-static inline void dec_dma_avail(S390PCIIOMMU *iommu)
+static inline void dec_dma_avail(S390PCIBusDevice *pbdev)
 {
-    if (iommu->dma_limit) {
-        iommu->dma_limit->avail--;
+    if (pbdev->dma_limit) {
+        pbdev->dma_limit->avail--;
     }
 }
 
@@ -633,7 +633,6 @@ int pcistg_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
 uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
                                S390IOTLBEntry *entry)
 {
-    S390PCIIOMMU *iommu = pbdev->iommu;
     S390IOTLBEntry *cache = g_hash_table_lookup(pbdev->iotlb, &entry->iova);
     IOMMUTLBEvent event = {
         .type = entry->perm ? IOMMU_NOTIFIER_MAP : IOMMU_NOTIFIER_UNMAP,
@@ -651,7 +650,7 @@ uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
             goto out;
         }
         g_hash_table_remove(pbdev->iotlb, &entry->iova);
-        inc_dma_avail(iommu);
+        inc_dma_avail(pbdev);
         /* Don't notify the iommu yet, maybe we can bundle contiguous unmaps */
         goto out;
     } else {
@@ -674,7 +673,7 @@ uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
         cache->len = TARGET_PAGE_SIZE;
         cache->perm = entry->perm;
         g_hash_table_replace(pbdev->iotlb, &cache->iova, cache);
-        dec_dma_avail(iommu);
+        dec_dma_avail(pbdev);
     }
 
     /*
@@ -684,7 +683,7 @@ uint32_t s390_pci_update_iotlb(S390PCIBusDevice *pbdev,
     memory_region_notify_iommu(&pbdev->iommu_mr, 0, event);
 
 out:
-    return iommu->dma_limit ? iommu->dma_limit->avail : 1;
+    return pbdev->dma_limit ? pbdev->dma_limit->avail : 1;
 }
 
 static void s390_pci_batch_unmap(S390PCIBusDevice *pbdev, uint64_t iova,
@@ -761,8 +760,8 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     }
 
     iommu = pbdev->iommu;
-    if (iommu->dma_limit) {
-        dma_avail = iommu->dma_limit->avail;
+    if (pbdev->dma_limit) {
+        dma_avail = pbdev->dma_limit->avail;
     } else {
         dma_avail = 1;
     }
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 24f6e60786..126a50c98b 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -279,7 +279,6 @@ struct S390PCIIOMMU {
     uint64_t pba;
     uint64_t pal;
     uint64_t max_dma_limit;
-    S390PCIDMACount *dma_limit;
 };
 
 typedef struct S390PCIIOMMUTable {
@@ -353,6 +352,7 @@ struct S390PCIBusDevice {
     IOMMUMemoryRegion iommu_mr;
     MemoryRegion *dm_mr;
     GHashTable *iotlb;
+    S390PCIDMACount *dma_limit;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
     IndAddr *indicator;
-- 
2.34.1

Re: [PATCH v6 08/15] s390x/pci: Move dma_limit from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         | 10 +++++-----
>   hw/s390x/s390-pci-inst.c        | 23 +++++++++++------------
>   include/hw/s390x/s390-pci-bus.h |  2 +-
>   3 files changed, 17 insertions(+), 18 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 09/15] s390x/pci: Move g_iota from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

This also allows to save/restore this field during migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         |  2 +-
 hw/s390x/s390-pci-inst.c        | 10 +++++-----
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 04bb0271e6..5180849518 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -617,7 +617,7 @@ static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
     }
 
     while (curr < end) {
-        error = s390_guest_io_table_walk(iommu->g_iota, curr, &entry);
+        error = s390_guest_io_table_walk(pbdev->g_iota, curr, &entry);
         if (error) {
             pbdev->state = ZPCI_FS_ERROR;
             s390_pci_generate_error_event(error, pbdev->fh, pbdev->fid, curr,
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index dc52da41b5..22b477ab38 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -765,7 +765,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     } else {
         dma_avail = 1;
     }
-    if (!iommu->g_iota) {
+    if (!pbdev->g_iota) {
         error = ERR_EVENT_INVALAS;
         goto err;
     }
@@ -785,7 +785,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     start = sstart;
     again = false;
     while (start < end) {
-        error = s390_guest_io_table_walk(iommu->g_iota, start, &entry);
+        error = s390_guest_io_table_walk(pbdev->g_iota, start, &entry);
         if (error) {
             break;
         }
@@ -1056,7 +1056,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
 
     iommu->pba = pba;
     iommu->pal = pal;
-    iommu->g_iota = g_iota;
+    pbdev->g_iota = g_iota;
 
     if (t) {
         s390_pci_iommu_enable(pbdev);
@@ -1073,7 +1073,7 @@ void pci_dereg_ioat(S390PCIBusDevice *pbdev)
     s390_pci_iommu_disable(pbdev);
     iommu->pba = 0;
     iommu->pal = 0;
-    iommu->g_iota = 0;
+    pbdev->g_iota = 0;
 }
 
 void fmb_timer_free(S390PCIBusDevice *pbdev)
@@ -1446,7 +1446,7 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
 
     stq_be_p(&fib.pba, pbdev->iommu->pba);
     stq_be_p(&fib.pal, pbdev->iommu->pal);
-    stq_be_p(&fib.iota, pbdev->iommu->g_iota);
+    stq_be_p(&fib.iota, pbdev->g_iota);
     stq_be_p(&fib.aibv, pbdev->routes.adapter.ind_addr);
     stq_be_p(&fib.aisb, pbdev->routes.adapter.summary_addr);
     stq_be_p(&fib.fmb_addr, pbdev->fmb_addr);
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 126a50c98b..a7d1f1ade2 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -275,7 +275,6 @@ struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
     MemoryRegion mr;
-    uint64_t g_iota;
     uint64_t pba;
     uint64_t pal;
     uint64_t max_dma_limit;
@@ -352,6 +351,7 @@ struct S390PCIBusDevice {
     IOMMUMemoryRegion iommu_mr;
     MemoryRegion *dm_mr;
     GHashTable *iotlb;
+    uint64_t g_iota;
     S390PCIDMACount *dma_limit;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
-- 
2.34.1

Re: [PATCH v6 09/15] s390x/pci: Move g_iota from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> This also allows to save/restore this field during migration.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         |  2 +-
>   hw/s390x/s390-pci-inst.c        | 10 +++++-----
>   include/hw/s390x/s390-pci-bus.h |  2 +-
>   3 files changed, 7 insertions(+), 7 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 10/15] s390x/pci: Move pba from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

This also allows to save/restore this field during migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         |  4 ++--
 hw/s390x/s390-pci-inst.c        | 10 +++++-----
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 5180849518..2309afcfa6 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -565,7 +565,7 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
 
     trace_s390_pci_iommu_xlate(addr);
 
-    if (addr < iommu->pba || addr > iommu->pal) {
+    if (addr < pbdev->pba || addr > iommu->pal) {
         error = ERR_EVENT_OORANGE;
         goto err;
     }
@@ -602,7 +602,7 @@ static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
     hwaddr curr, end;
     S390PCIIOMMU *iommu = pbdev->iommu;
 
-    curr = iommu->pba;
+    curr = pbdev->pba;
     end = iommu->pal;
 
     if (pbdev->dm_mr) {
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 22b477ab38..aa2bc98254 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -770,7 +770,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
         goto err;
     }
 
-    if (end < start || end < iommu->pba || start > iommu->pal) {
+    if (end < start || end < pbdev->pba || start > iommu->pal) {
         error = ERR_EVENT_OORANGE;
         goto err;
     }
@@ -778,7 +778,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
      * If the specified range at least partially overlaps the registered
      * aperture, clamp the request to the aperture and ignore the rest.
      */
-    sstart = MAX(start, iommu->pba);
+    sstart = MAX(start, pbdev->pba);
     end = MIN(end, iommu->pal + 1);
 
  retry:
@@ -1054,7 +1054,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
         return -EINVAL;
     }
 
-    iommu->pba = pba;
+    pbdev->pba = pba;
     iommu->pal = pal;
     pbdev->g_iota = g_iota;
 
@@ -1071,7 +1071,7 @@ void pci_dereg_ioat(S390PCIBusDevice *pbdev)
 {
     S390PCIIOMMU *iommu = pbdev->iommu;
     s390_pci_iommu_disable(pbdev);
-    iommu->pba = 0;
+    pbdev->pba = 0;
     iommu->pal = 0;
     pbdev->g_iota = 0;
 }
@@ -1444,7 +1444,7 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
         return 0;
     }
 
-    stq_be_p(&fib.pba, pbdev->iommu->pba);
+    stq_be_p(&fib.pba, pbdev->pba);
     stq_be_p(&fib.pal, pbdev->iommu->pal);
     stq_be_p(&fib.iota, pbdev->g_iota);
     stq_be_p(&fib.aibv, pbdev->routes.adapter.ind_addr);
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index a7d1f1ade2..42f39a5cf0 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -275,7 +275,6 @@ struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
     MemoryRegion mr;
-    uint64_t pba;
     uint64_t pal;
     uint64_t max_dma_limit;
 };
@@ -352,6 +351,7 @@ struct S390PCIBusDevice {
     MemoryRegion *dm_mr;
     GHashTable *iotlb;
     uint64_t g_iota;
+    uint64_t pba;
     S390PCIDMACount *dma_limit;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
-- 
2.34.1

Re: [PATCH v6 10/15] s390x/pci: Move pba from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> This also allows to save/restore this field during migration.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         |  4 ++--
>   hw/s390x/s390-pci-inst.c        | 10 +++++-----
>   include/hw/s390x/s390-pci-bus.h |  2 +-
>   3 files changed, 8 insertions(+), 8 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 11/15] s390x/pci: Move pal from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

This also allows to save/restore this field during migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         |  8 +++-----
 hw/s390x/s390-pci-inst.c        | 14 +++++---------
 include/hw/s390x/s390-pci-bus.h |  2 +-
 3 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index 2309afcfa6..a94e24a2ac 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -540,7 +540,6 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
                                           IOMMUAccessFlags flag, int iommu_idx)
 {
     S390PCIBusDevice *pbdev = container_of(mr, S390PCIBusDevice, iommu_mr);
-    S390PCIIOMMU *iommu = pbdev->iommu;
     S390IOTLBEntry *entry;
     uint64_t iova = addr & TARGET_PAGE_MASK;
     uint16_t error = 0;
@@ -565,7 +564,7 @@ static IOMMUTLBEntry s390_translate_iommu(IOMMUMemoryRegion *mr, hwaddr addr,
 
     trace_s390_pci_iommu_xlate(addr);
 
-    if (addr < pbdev->pba || addr > iommu->pal) {
+    if (addr < pbdev->pba || addr > pbdev->pal) {
         error = ERR_EVENT_OORANGE;
         goto err;
     }
@@ -600,10 +599,9 @@ static void s390_pci_ioat_replay(S390PCIBusDevice *pbdev)
     uint16_t error = 0;
     uint32_t dma_avail;
     hwaddr curr, end;
-    S390PCIIOMMU *iommu = pbdev->iommu;
 
     curr = pbdev->pba;
-    end = iommu->pal;
+    end = pbdev->pal;
 
     if (pbdev->dm_mr) {
         /* If direct mapping is used, there are no guest tables to replay */
@@ -783,7 +781,7 @@ void s390_pci_iommu_enable(S390PCIBusDevice *pbdev)
     char *name = g_strdup_printf("iommu-s390-%04x", pbdev->uid);
     memory_region_init_iommu(&pbdev->iommu_mr, sizeof(pbdev->iommu_mr),
                              TYPE_S390_IOMMU_MEMORY_REGION, OBJECT(&iommu->mr),
-                             name, iommu->pal + 1);
+                             name, pbdev->pal + 1);
     pbdev->iommu_enabled = true;
     memory_region_add_subregion(&iommu->mr, 0, MEMORY_REGION(&pbdev->iommu_mr));
     g_free(name);
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index aa2bc98254..f93db10c81 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -717,7 +717,6 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
     uint32_t fh;
     uint16_t error = 0;
     S390PCIBusDevice *pbdev;
-    S390PCIIOMMU *iommu;
     S390IOTLBEntry entry;
     hwaddr start, end, sstart;
     uint32_t dma_avail;
@@ -759,7 +758,6 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
         break;
     }
 
-    iommu = pbdev->iommu;
     if (pbdev->dma_limit) {
         dma_avail = pbdev->dma_limit->avail;
     } else {
@@ -770,7 +768,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
         goto err;
     }
 
-    if (end < start || end < pbdev->pba || start > iommu->pal) {
+    if (end < start || end < pbdev->pba || start > pbdev->pal) {
         error = ERR_EVENT_OORANGE;
         goto err;
     }
@@ -779,7 +777,7 @@ int rpcit_service_call(S390CPU *cpu, uint8_t r1, uint8_t r2, uintptr_t ra)
      * aperture, clamp the request to the aperture and ignore the rest.
      */
     sstart = MAX(start, pbdev->pba);
-    end = MIN(end, iommu->pal + 1);
+    end = MIN(end, pbdev->pal + 1);
 
  retry:
     start = sstart;
@@ -1029,7 +1027,6 @@ bool s390_pci_is_translation_enabled(uint64_t g_iota)
 static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
                     uintptr_t ra)
 {
-    S390PCIIOMMU *iommu = pbdev->iommu;
     uint64_t pba = ldq_be_p(&fib.pba);
     uint64_t pal = ldq_be_p(&fib.pal);
     uint64_t g_iota = ldq_be_p(&fib.iota);
@@ -1055,7 +1052,7 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
     }
 
     pbdev->pba = pba;
-    iommu->pal = pal;
+    pbdev->pal = pal;
     pbdev->g_iota = g_iota;
 
     if (t) {
@@ -1069,10 +1066,9 @@ static int reg_ioat(CPUS390XState *env, S390PCIBusDevice *pbdev, ZpciFib fib,
 
 void pci_dereg_ioat(S390PCIBusDevice *pbdev)
 {
-    S390PCIIOMMU *iommu = pbdev->iommu;
     s390_pci_iommu_disable(pbdev);
     pbdev->pba = 0;
-    iommu->pal = 0;
+    pbdev->pal = 0;
     pbdev->g_iota = 0;
 }
 
@@ -1445,7 +1441,7 @@ int stpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
     }
 
     stq_be_p(&fib.pba, pbdev->pba);
-    stq_be_p(&fib.pal, pbdev->iommu->pal);
+    stq_be_p(&fib.pal, pbdev->pal);
     stq_be_p(&fib.iota, pbdev->g_iota);
     stq_be_p(&fib.aibv, pbdev->routes.adapter.ind_addr);
     stq_be_p(&fib.aisb, pbdev->routes.adapter.summary_addr);
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 42f39a5cf0..1f5d8d4bd4 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -275,7 +275,6 @@ struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
     MemoryRegion mr;
-    uint64_t pal;
     uint64_t max_dma_limit;
 };
 
@@ -352,6 +351,7 @@ struct S390PCIBusDevice {
     GHashTable *iotlb;
     uint64_t g_iota;
     uint64_t pba;
+    uint64_t pal;
     S390PCIDMACount *dma_limit;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
-- 
2.34.1

Re: [PATCH v6 11/15] s390x/pci: Move pal from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> This also allows to save/restore this field during migration.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         |  8 +++-----
>   hw/s390x/s390-pci-inst.c        | 14 +++++---------
>   include/hw/s390x/s390-pci-bus.h |  2 +-
>   3 files changed, 9 insertions(+), 15 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 12/15] s390x/pci: Move max_dma_limit from S390PCIIOMMU to S390PCIBusDevice

[Konstantin Shkolnyy]

This field is only used when S390PCIBusDevice exists, so it can be moved
there to simplify S390PCIIOMMU which purpose is just to store the "root"
AddressSpace.

This also allows to save/restore this field during migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-vfio.c        | 4 ++--
 include/hw/s390x/s390-pci-bus.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/s390x/s390-pci-vfio.c b/hw/s390x/s390-pci-vfio.c
index db6de00bd2..a035ba5b2c 100644
--- a/hw/s390x/s390-pci-vfio.c
+++ b/hw/s390x/s390-pci-vfio.c
@@ -90,7 +90,7 @@ S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s,
     cnt->users = 1;
     cnt->avail = avail;
     QTAILQ_INSERT_TAIL(&s->zpci_dma_limit, cnt, link);
-    pbdev->iommu->max_dma_limit = avail;
+    pbdev->max_dma_limit = avail;
     return cnt;
 }
 
@@ -152,7 +152,7 @@ static void s390_pci_read_base(S390PCIBusDevice *pbdev,
      * to request that the guest free DMA mappings as necessary.
      */
     if (!pbdev->rtr_avail) {
-        vfio_size = pbdev->iommu->max_dma_limit << qemu_target_page_bits();
+        vfio_size = pbdev->max_dma_limit << qemu_target_page_bits();
         if (vfio_size > 0 && vfio_size < cap->end_dma - cap->start_dma + 1) {
             pbdev->zpci_fn.edma = cap->start_dma + vfio_size - 1;
         }
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 1f5d8d4bd4..e3cbee2695 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -275,7 +275,6 @@ struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
     MemoryRegion mr;
-    uint64_t max_dma_limit;
 };
 
 typedef struct S390PCIIOMMUTable {
@@ -352,6 +351,7 @@ struct S390PCIBusDevice {
     uint64_t g_iota;
     uint64_t pba;
     uint64_t pal;
+    uint64_t max_dma_limit;
     S390PCIDMACount *dma_limit;
     MemoryRegion msix_notify_mr;
     IndAddr *summary_ind;
-- 
2.34.1

Re: [PATCH v6 12/15] s390x/pci: Move max_dma_limit from S390PCIIOMMU to S390PCIBusDevice

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> This field is only used when S390PCIBusDevice exists, so it can be moved
> there to simplify S390PCIIOMMU which purpose is just to store the "root"
> AddressSpace.
>
> This also allows to save/restore this field during migration.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-vfio.c        | 4 ++--
>   include/hw/s390x/s390-pci-bus.h | 2 +-
>   2 files changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 13/15] s390x/pci: Add a comment explaining S390PCIIOMMU purpose

[Konstantin Shkolnyy]

Because S390PCIIOMMU has just been cleaned up of fields it didn't have to
carry, add a comment explaining why it exists in the first place and
discouraging adding more fields to it in the future.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 include/hw/s390x/s390-pci-bus.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index e3cbee2695..17ecf3e0da 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -271,6 +271,17 @@ typedef struct S390PCIDMACount {
     QTAILQ_ENTRY(S390PCIDMACount) link;
 } S390PCIDMACount;
 
+/*
+ * This structure holds the PCI device AddressSpace that QEMU needs to link
+ * into its internal structures before the zPCI and PCI devices are fully
+ * initialized. QEMU wants to have this "root" AddressSpace before the PCI
+ * device is plugged in. It's only actually used for I/O while the PCI
+ * device is plugged in and configured by the guest, at which time it has
+ * additional memory subregions from zPCI device, that can do real work.
+ * In other words, S390PCIIOMMU holds fields that logically belong to
+ * S390PCIBusDevice but need to exist before S390PCIBusDevice exists.
+ * Therefore, no other kind of fields should be placed in S390PCIIOMMU.
+ */
 struct S390PCIIOMMU {
     Object parent_obj;
     AddressSpace as;
-- 
2.34.1

Re: [PATCH v6 13/15] s390x/pci: Add a comment explaining S390PCIIOMMU purpose

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> Because S390PCIIOMMU has just been cleaned up of fields it didn't have to
> carry, add a comment explaining why it exists in the first place and
> discouraging adding more fields to it in the future.
>
> Signed-off-by: Konstantin Shkolnyy<kshk@linux.ibm.com>
> ---
>   include/hw/s390x/s390-pci-bus.h | 11 +++++++++++
>   1 file changed, 11 insertions(+)

Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

[PATCH v6 14/15] s390x/pci: Implement migration for emulated devices

[Konstantin Shkolnyy]

Implement zPCI device state migration, consequently enabling migration
of VMs that have emulated PCI devices, whether virtio or not.
Migration is allowed for devices whose function handle has the
FH_SHM_EMUL bit set. For these devices QEMU will save and restore the
state of its zPCI emulator.

This will enable emulated PCI migration starting with s390-ccw-virtio-11.1.

Passthrough devices will continue to block migration.

Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         | 196 +++++++++++++++++++++++++++++++-
 hw/s390x/s390-pci-inst.c        |   2 +-
 hw/s390x/s390-virtio-ccw.c      |   4 +
 include/hw/s390x/s390-pci-bus.h |   4 +
 4 files changed, 200 insertions(+), 6 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index a94e24a2ac..f043dc5524 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -26,6 +26,7 @@
 #include "hw/pci/pci_bridge.h"
 #include "hw/pci/msi.h"
 #include "exec/cpu-common.h"
+#include "migration/blocker.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
 #include "system/physmem.h"
@@ -34,6 +35,11 @@
 
 #include "trace.h"
 
+static const Property phb_props[] = {
+    DEFINE_PROP_BOOL("x-zpci-emul-dev-migr-enabled", S390pciState,
+                     emul_dev_migr_enabled, true),
+};
+
 S390pciState *s390_get_phb(void)
 {
     static S390pciState *phb;
@@ -1129,6 +1135,47 @@ static int s390_pci_interp_plug(S390pciState *s, S390PCIBusDevice *pbdev)
     return 0;
 }
 
+static int s390_set_emul_dev_migration_blocker(S390PCIBusDevice *pbdev,
+        S390pciState *s, Error **errp)
+{
+    if (s->emul_dev_migr_enabled) {
+        return 0;
+    }
+    error_setg(&pbdev->emul_dev_migr_blocker,
+               "Migration blocked on this machine type by emulated zPCI device "
+               "fh 0x%x uid %d fid %d", pbdev->fh, pbdev->uid, pbdev->fid);
+    return migrate_add_blocker(&pbdev->emul_dev_migr_blocker, errp);
+}
+
+static void s390_clear_emul_dev_migration_blocker(S390PCIBusDevice *pbdev,
+        S390pciState *s)
+{
+    if (pbdev->emul_dev_migr_blocker) {
+        migrate_del_blocker(&pbdev->emul_dev_migr_blocker);
+    }
+}
+
+static int s390_set_passthrough_migration_blocker(S390PCIBusDevice *pbdev,
+                                            Error **errp)
+{
+    pbdev->passthrough_migr_blocker = NULL;
+
+    if (pbdev->fh & FH_SHM_EMUL) {
+        return 0;
+    }
+    error_setg(&pbdev->passthrough_migr_blocker,
+               "Migration blocked by passthrough zPCI device "
+               "fh 0x%x uid %d fid %d", pbdev->fh, pbdev->uid, pbdev->fid);
+    return migrate_add_blocker(&pbdev->passthrough_migr_blocker, errp);
+}
+
+static void s390_clear_passthrough_migration_blocker(S390PCIBusDevice *pbdev)
+{
+    if (pbdev->passthrough_migr_blocker) {
+        migrate_del_blocker(&pbdev->passthrough_migr_blocker);
+    }
+}
+
 static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
                               Error **errp)
 {
@@ -1242,9 +1289,20 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
             pbdev->rtr_avail = false;
         }
 
+        if (s390_set_passthrough_migration_blocker(pbdev, errp) != 0) {
+            return;
+        }
+
+        if (s390_set_emul_dev_migration_blocker(pbdev, s, errp) != 0) {
+            s390_clear_passthrough_migration_blocker(pbdev);
+            return;
+        }
+
         if (s390_pci_msix_init(pbdev) && !pbdev->interp) {
             error_setg(errp, "MSI-X support is mandatory "
                        "in the S390 architecture");
+            s390_clear_emul_dev_migration_blocker(pbdev, s);
+            s390_clear_passthrough_migration_blocker(pbdev);
             return;
         }
 
@@ -1284,6 +1342,9 @@ static void s390_pcihost_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
             return;
         }
 
+        s390_clear_emul_dev_migration_blocker(pbdev, s);
+        s390_clear_passthrough_migration_blocker(pbdev);
+
         s390_pci_generate_plug_event(HP_EVENT_STANDBY_TO_RESERVED,
                                      pbdev->fh, pbdev->fid);
         bus = pci_get_bus(pci_dev);
@@ -1451,6 +1512,7 @@ static void s390_pcihost_class_init(ObjectClass *klass, const void *data)
     hc->unplug_request = s390_pcihost_unplug_request;
     hc->unplug = s390_pcihost_unplug;
     msi_nonbroken = true;
+    device_class_set_props(dc, phb_props);
 }
 
 static const TypeInfo s390_pcihost_info = {
@@ -1464,10 +1526,33 @@ static const TypeInfo s390_pcihost_info = {
     }
 };
 
+/* Return a unique bus "path" for zpci device */
+static char *s390_pci_bus_get_dev_path(DeviceState *dev)
+{
+    S390PCIBusDevice *pbdev = S390_PCI_DEVICE(dev);
+    return g_strdup_printf("uid-%04x", pbdev->uid);
+}
+
+static void s390_pcibus_class_init(ObjectClass *oc, const void *data)
+{
+    BusClass *bc = BUS_CLASS(oc);
+    bc->get_dev_path = s390_pci_bus_get_dev_path;
+}
+
 static const TypeInfo s390_pcibus_info = {
     .name = TYPE_S390_PCI_BUS,
     .parent = TYPE_BUS,
     .instance_size = sizeof(S390PCIBus),
+    /*
+     * Implement get_dev_path() to provide each zpci device with a unique
+     * stable UID-based bus "path". The "path" is used as part of idstr in the
+     * migration stream, making idstr unique and instance_id always 0.
+     * For migration to succeed, (idstr+instance_id) must match those generated
+     * during QEMU start. Without unique idstr, QEMU will generate variable
+     * instance_id to distinquish devices, and that instance_id can change
+     * if a device is unplugged and plugged back, preventing migration.
+     */
+    .class_init = s390_pcibus_class_init,
 };
 
 static uint16_t s390_pci_generate_uid(S390pciState *s)
@@ -1613,13 +1698,114 @@ static const Property s390_pci_device_properties[] = {
                      true),
 };
 
-static const VMStateDescription s390_pci_device_vmstate = {
-    .name = TYPE_S390_PCI_DEVICE,
+static int s390_pci_device_pre_load(void *opaque)
+{
+    S390PCIBusDevice *pbdev = S390_PCI_DEVICE(opaque);
+    S390PCIBusDevice *found_pbdev;
+
+    /*
+     * Because state loading can change pbdev->idx make sure pbdev is removed
+     * from the table before that happens. The table type used stores a pointer
+     * to pbdev->idx and becomes corrupt if idx is changed from outside. But be
+     * careful to not remove instead another pbdev whose state might have been
+     * loaded earlier and that got assigned this idx value and had therefore
+     * already replaced our pbdev in the table. post_load() will reinsert our
+     * pbdev into the table.
+     */
+    found_pbdev = g_hash_table_lookup(s390_get_phb()->zpci_table, &pbdev->idx);
+    assert(found_pbdev);
+    if (found_pbdev == pbdev) {
+        g_hash_table_remove(s390_get_phb()->zpci_table, &pbdev->idx);
+    }
+
+    return 0;
+}
+
+static int s390_pci_device_post_load(void *opaque, int version_id)
+{
+    S390PCIBusDevice *pbdev = S390_PCI_DEVICE(opaque);
+
+    /*
+     * Now that pbdev->idx has been loaded, use it to place pbdev back into
+     * the table. This may replace a different not-yet-state-loaded pbdev,
+     * but pre_load() handles this case.
+     */
+    g_hash_table_replace(s390_get_phb()->zpci_table, &pbdev->idx, pbdev);
+
+    /*
+     * Regenerate IOMMU state, including IOTLB contents and QEMU memory regions.
+     */
+    if (pbdev->iommu_enabled) {
+        assert(pbdev->iommu);
+        if (s390_pci_is_translation_enabled(pbdev->g_iota)) {
+            s390_pci_iommu_enable(pbdev);
+            s390_pci_ioat_replay(pbdev);
+        } else {
+            s390_pci_iommu_direct_map_enable(pbdev);
+        }
+    }
+
     /*
-     * TODO: add state handling here, so migration works at least with
-     * emulated pci devices on s390x
+     * Guest sets fmb_addr by mpcifc.ZPCI_MOD_FC_SET_MEASURE instruction,
+     * whose handler consequently starts fmb_timer. We may need to restart it.
      */
-    .unmigratable = 1,
+    if (pbdev->fmb_addr) {
+        assert(!pbdev->fmb_timer);
+        assert(pbdev->pci_group);
+        pbdev->fmb_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
+                                        fmb_update, pbdev);
+        timer_mod(pbdev->fmb_timer,
+                  qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+                                    pbdev->pci_group->zpci_group.mui);
+    }
+    return 0;
+}
+
+static const VMStateDescription s390_pci_device_vmstate = {
+    .name = TYPE_S390_PCI_DEVICE,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .pre_load = s390_pci_device_pre_load,
+    .post_load = s390_pci_device_post_load,
+    .fields = (const VMStateField[]) {
+        VMSTATE_UINT32(state, S390PCIBusDevice),
+        VMSTATE_UINT16(uid, S390PCIBusDevice),
+        VMSTATE_UINT32(idx, S390PCIBusDevice),
+        VMSTATE_UINT32(fh, S390PCIBusDevice),
+        VMSTATE_UINT32(fid, S390PCIBusDevice),
+        VMSTATE_BOOL(fid_defined, S390PCIBusDevice),
+        VMSTATE_UINT64(fmb_addr, S390PCIBusDevice),
+        VMSTATE_UINT32(fmb.format, S390PCIBusDevice),
+        VMSTATE_UINT32(fmb.sample, S390PCIBusDevice),
+        VMSTATE_UINT64(fmb.last_update, S390PCIBusDevice),
+        VMSTATE_UINT64_ARRAY(fmb.counter, S390PCIBusDevice,
+                ARRAY_SIZE(((S390PCIBusDevice *)0)->fmb.counter)),
+        VMSTATE_UINT64(fmb.fmt0.dma_rbytes, S390PCIBusDevice),
+        VMSTATE_UINT64(fmb.fmt0.dma_wbytes, S390PCIBusDevice),
+        VMSTATE_UINT8(isc, S390PCIBusDevice),
+        VMSTATE_UINT16(noi, S390PCIBusDevice),
+        VMSTATE_UINT8(sum, S390PCIBusDevice),
+        VMSTATE_UINT8(pft, S390PCIBusDevice),
+        VMSTATE_UINT64(routes.adapter.ind_addr, S390PCIBusDevice),
+        VMSTATE_UINT64(routes.adapter.summary_addr, S390PCIBusDevice),
+        VMSTATE_UINT64(routes.adapter.ind_offset, S390PCIBusDevice),
+        VMSTATE_UINT32(routes.adapter.summary_offset, S390PCIBusDevice),
+        VMSTATE_UINT32(routes.adapter.adapter_id, S390PCIBusDevice),
+        VMSTATE_BOOL(iommu_enabled, S390PCIBusDevice),
+        VMSTATE_UINT64(g_iota, S390PCIBusDevice),
+        VMSTATE_UINT64(pba, S390PCIBusDevice),
+        VMSTATE_UINT64(pal, S390PCIBusDevice),
+        VMSTATE_UINT64(max_dma_limit, S390PCIBusDevice),
+        VMSTATE_PTR_TO_IND_ADDR(summary_ind, S390PCIBusDevice),
+        VMSTATE_PTR_TO_IND_ADDR(indicator, S390PCIBusDevice),
+        VMSTATE_BOOL(pci_unplug_request_processed, S390PCIBusDevice),
+        VMSTATE_BOOL(unplug_requested, S390PCIBusDevice),
+        VMSTATE_BOOL(interp, S390PCIBusDevice),
+        VMSTATE_BOOL(forwarding_assist, S390PCIBusDevice),
+        VMSTATE_BOOL(aif, S390PCIBusDevice),
+        VMSTATE_BOOL(rtr_avail, S390PCIBusDevice),
+        VMSTATE_END_OF_LIST()
+    }
 };
 
 static void s390_pci_device_class_init(ObjectClass *klass, const void *data)
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index f93db10c81..6b0742d143 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -1122,7 +1122,7 @@ static int fmb_do_update(S390PCIBusDevice *pbdev, int offset, uint64_t val,
     return ret;
 }
 
-static void fmb_update(void *opaque)
+void fmb_update(void *opaque)
 {
     S390PCIBusDevice *pbdev = opaque;
     int64_t t = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 25a9fa4955..d8975da4f1 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -931,6 +931,10 @@ static void ccw_machine_11_1_instance_options(MachineState *machine)
 
 static void ccw_machine_11_1_class_options(MachineClass *mc)
 {
+    static GlobalProperty compat[] = {
+        { TYPE_S390_PCI_HOST_BRIDGE, "x-zpci-emul-dev-migr-enabled", "off" },
+    };
+    compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
 }
 DEFINE_CCW_MACHINE_AS_LATEST(11, 1);
 
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 17ecf3e0da..66c1f04ead 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -340,6 +340,8 @@ struct S390PCIBusDevice {
     uint16_t uid;
     uint32_t idx;
     uint32_t fh;
+    Error *emul_dev_migr_blocker;
+    Error *passthrough_migr_blocker;
     uint32_t fid;
     bool fid_defined;
     uint64_t fmb_addr;
@@ -393,6 +395,7 @@ struct S390pciState {
     QTAILQ_HEAD(, S390PCIDMACount) zpci_dma_limit;
     QTAILQ_HEAD(, S390PCIGroup) zpci_groups;
     uint8_t next_sim_grp;
+    bool emul_dev_migr_enabled;
 };
 
 S390pciState *s390_get_phb(void);
@@ -418,5 +421,6 @@ S390PCIBusDevice *s390_pci_find_dev_by_pci(S390pciState *s,
 S390PCIBusDevice *s390_pci_find_next_avail_dev(S390pciState *s,
                                                S390PCIBusDevice *pbdev);
 void s390_pci_ism_reset(void);
+void fmb_update(void *opaque);
 
 #endif
-- 
2.34.1

Re: [PATCH v6 14/15] s390x/pci: Implement migration for emulated devices

[Farhan Ali]

On 8/7/2026 10:08 AM, Konstantin Shkolnyy wrote:
> Implement zPCI device state migration, consequently enabling migration
> of VMs that have emulated PCI devices, whether virtio or not.
> Migration is allowed for devices whose function handle has the
> FH_SHM_EMUL bit set. For these devices QEMU will save and restore the
> state of its zPCI emulator.
>
> This will enable emulated PCI migration starting with s390-ccw-virtio-11.1.
>
> Passthrough devices will continue to block migration.
>
> Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
> ---
>   hw/s390x/s390-pci-bus.c         | 196 +++++++++++++++++++++++++++++++-
>   hw/s390x/s390-pci-inst.c        |   2 +-
>   hw/s390x/s390-virtio-ccw.c      |   4 +
>   include/hw/s390x/s390-pci-bus.h |   4 +
>   4 files changed, 200 insertions(+), 6 deletions(-)
>
> diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
> index a94e24a2ac..f043dc5524 100644
> --- a/hw/s390x/s390-pci-bus.c
> +++ b/hw/s390x/s390-pci-bus.c
> @@ -26,6 +26,7 @@
>   #include "hw/pci/pci_bridge.h"
>   #include "hw/pci/msi.h"
>   #include "exec/cpu-common.h"
> +#include "migration/blocker.h"
>   #include "qemu/error-report.h"
>   #include "qemu/module.h"
>   #include "system/physmem.h"
> @@ -34,6 +35,11 @@
>   
>   #include "trace.h"
>   
> +static const Property phb_props[] = {
> +    DEFINE_PROP_BOOL("x-zpci-emul-dev-migr-enabled", S390pciState,
> +                     emul_dev_migr_enabled, true),
> +};
> +
>   S390pciState *s390_get_phb(void)
>   {
>       static S390pciState *phb;
> @@ -1129,6 +1135,47 @@ static int s390_pci_interp_plug(S390pciState *s, S390PCIBusDevice *pbdev)
>       return 0;
>   }
>   
> +static int s390_set_emul_dev_migration_blocker(S390PCIBusDevice *pbdev,
> +        S390pciState *s, Error **errp)
> +{
> +    if (s->emul_dev_migr_enabled) {
> +        return 0;
> +    }
> +    error_setg(&pbdev->emul_dev_migr_blocker,
> +               "Migration blocked on this machine type by emulated zPCI device "
> +               "fh 0x%x uid %d fid %d", pbdev->fh, pbdev->uid, pbdev->fid);
> +    return migrate_add_blocker(&pbdev->emul_dev_migr_blocker, errp);
> +}
> +
> +static void s390_clear_emul_dev_migration_blocker(S390PCIBusDevice *pbdev,
> +        S390pciState *s)

I don't think we need to pass the S390pciState here, as it's not used 
anymore. So we should remove it and update the callsites.

With this fixed
Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

> +{
> +    if (pbdev->emul_dev_migr_blocker) {
> +        migrate_del_blocker(&pbdev->emul_dev_migr_blocker);
> +    }
> +}
> +

<..snip..>

Re: [PATCH v6 14/15] s390x/pci: Implement migration for emulated devices

[Matthew Rosato]

>> +static void s390_clear_emul_dev_migration_blocker(S390PCIBusDevice
>> *pbdev,
>> +        S390pciState *s)
> 
> I don't think we need to pass the S390pciState here, as it's not used
> anymore. So we should remove it and update the callsites.
> 
> With this fixed
> Reviewed-by: Farhan Ali<alifm@linux.ibm.com>

I haven't reviewed this version yet, but don't forget that you will also
need to move the fence to virtio-11.2

[PATCH v6 15/15] s390x/pci: Create function to contain fmb_timer start

[Konstantin Shkolnyy]

fmb_timer is now started in 3 different places. The new function will
encapsulate that to make sure mui is added in all cases.

Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Konstantin Shkolnyy <kshk@linux.ibm.com>
---
 hw/s390x/s390-pci-bus.c         |  5 ++---
 hw/s390x/s390-pci-inst.c        | 14 ++++++++++----
 include/hw/s390x/s390-pci-bus.h |  1 +
 3 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c
index f043dc5524..0eac516b68 100644
--- a/hw/s390x/s390-pci-bus.c
+++ b/hw/s390x/s390-pci-bus.c
@@ -1754,9 +1754,8 @@ static int s390_pci_device_post_load(void *opaque, int version_id)
         assert(pbdev->pci_group);
         pbdev->fmb_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
                                         fmb_update, pbdev);
-        timer_mod(pbdev->fmb_timer,
-                  qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
-                                    pbdev->pci_group->zpci_group.mui);
+        s390_pci_schedule_fmb_timer(pbdev,
+                                    qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
     }
     return 0;
 }
diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 6b0742d143..89e4830dcd 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -1122,9 +1122,16 @@ static int fmb_do_update(S390PCIBusDevice *pbdev, int offset, uint64_t val,
     return ret;
 }
 
+void s390_pci_schedule_fmb_timer(S390PCIBusDevice *pbdev, uint64_t start)
+{
+    timer_mod(pbdev->fmb_timer, start + pbdev->pci_group->zpci_group.mui);
+}
+
 void fmb_update(void *opaque)
 {
     S390PCIBusDevice *pbdev = opaque;
+
+    /* Must be read before updating U bit */
     int64_t t = qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL);
     int i;
 
@@ -1161,7 +1168,7 @@ void fmb_update(void *opaque)
                       sizeof(pbdev->fmb.last_update))) {
         return;
     }
-    timer_mod(pbdev->fmb_timer, t + pbdev->pci_group->zpci_group.mui);
+    s390_pci_schedule_fmb_timer(pbdev, t);
 }
 
 static int mpcifc_reg_int_interp(S390PCIBusDevice *pbdev, ZpciFib *fib)
@@ -1354,9 +1361,8 @@ int mpcifc_service_call(S390CPU *cpu, uint8_t r1, uint64_t fiba, uint8_t ar,
             timer_del(pbdev->fmb_timer);
         }
         pbdev->fmb_addr = fmb_addr;
-        timer_mod(pbdev->fmb_timer,
-                  qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
-                                    pbdev->pci_group->zpci_group.mui);
+        s390_pci_schedule_fmb_timer(pbdev,
+                                    qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
         break;
     }
     default:
diff --git a/include/hw/s390x/s390-pci-bus.h b/include/hw/s390x/s390-pci-bus.h
index 66c1f04ead..25f69407df 100644
--- a/include/hw/s390x/s390-pci-bus.h
+++ b/include/hw/s390x/s390-pci-bus.h
@@ -422,5 +422,6 @@ S390PCIBusDevice *s390_pci_find_next_avail_dev(S390pciState *s,
                                                S390PCIBusDevice *pbdev);
 void s390_pci_ism_reset(void);
 void fmb_update(void *opaque);
+void s390_pci_schedule_fmb_timer(S390PCIBusDevice *pbdev, uint64_t start);
 
 #endif
-- 
2.34.1