12 files changed, 291 insertions, 236 deletions

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index 89c8cd9..4bd0d60 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -148,12 +148,19 @@ static void spapr_xive_end_pic_print_info(SpaprXive *xive, XiveEND *end,
     xive_end_queue_pic_print_info(end, 6, mon);
 }
 
+/*
+ * kvm_irqchip_in_kernel() will cause the compiler to turn this
+ * info a nop if CONFIG_KVM isn't defined.
+ */
+#define spapr_xive_in_kernel(xive) \
+    (kvm_irqchip_in_kernel() && (xive)->fd != -1)
+
 void spapr_xive_pic_print_info(SpaprXive *xive, Monitor *mon)
 {
     XiveSource *xsrc = &xive->source;
     int i;
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         Error *local_err = NULL;
 
         kvmppc_xive_synchronize_state(xive, &local_err);
@@ -329,7 +336,7 @@ static void spapr_xive_realize(DeviceState *dev, Error **errp)
     sysbus_init_mmio(SYS_BUS_DEVICE(xive), &end_xsrc->esb_mmio);
 
     /* Set the mapping address of the END ESB pages after the source ESBs */
-    xive->end_base = xive->vc_base + (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
+    xive->end_base = xive->vc_base + xive_source_esb_len(xsrc);
 
     /*
      * Allocate the routing tables
@@ -507,8 +514,10 @@ static const VMStateDescription vmstate_spapr_xive_eas = {
 
 static int vmstate_spapr_xive_pre_save(void *opaque)
 {
-    if (kvm_irqchip_in_kernel()) {
-        return kvmppc_xive_pre_save(SPAPR_XIVE(opaque));
+    SpaprXive *xive = SPAPR_XIVE(opaque);
+
+    if (spapr_xive_in_kernel(xive)) {
+        return kvmppc_xive_pre_save(xive);
     }
 
     return 0;
@@ -520,8 +529,10 @@ static int vmstate_spapr_xive_pre_save(void *opaque)
  */
 static int spapr_xive_post_load(SpaprInterruptController *intc, int version_id)
 {
-    if (kvm_irqchip_in_kernel()) {
-        return kvmppc_xive_post_load(SPAPR_XIVE(intc), version_id);
+    SpaprXive *xive = SPAPR_XIVE(intc);
+
+    if (spapr_xive_in_kernel(xive)) {
+        return kvmppc_xive_post_load(xive, version_id);
     }
 
     return 0;
@@ -564,7 +575,7 @@ static int spapr_xive_claim_irq(SpaprInterruptController *intc, int lisn,
         xive_source_irq_set_lsi(xsrc, lisn);
     }
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         return kvmppc_xive_source_reset_one(xsrc, lisn, errp);
     }
 
@@ -641,7 +652,7 @@ static void spapr_xive_set_irq(SpaprInterruptController *intc, int irq, int val)
 {
     SpaprXive *xive = SPAPR_XIVE(intc);
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         kvmppc_xive_source_set_irq(&xive->source, irq, val);
     } else {
         xive_source_set_irq(&xive->source, irq, val);
@@ -749,11 +760,16 @@ static void spapr_xive_deactivate(SpaprInterruptController *intc)
 
     spapr_xive_mmio_set_enabled(xive, false);
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         kvmppc_xive_disconnect(intc);
     }
 }
 
+static bool spapr_xive_in_kernel_xptr(const XivePresenter *xptr)
+{
+    return spapr_xive_in_kernel(SPAPR_XIVE(xptr));
+}
+
 static void spapr_xive_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -788,6 +804,7 @@ static void spapr_xive_class_init(ObjectClass *klass, void *data)
     sicc->post_load = spapr_xive_post_load;
 
     xpc->match_nvt  = spapr_xive_match_nvt;
+    xpc->in_kernel  = spapr_xive_in_kernel_xptr;
 }
 
 static const TypeInfo spapr_xive_info = {
@@ -1058,7 +1075,7 @@ static target_ulong h_int_set_source_config(PowerPCCPU *cpu,
         new_eas.w = xive_set_field64(EAS_END_DATA, new_eas.w, eisn);
     }
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         Error *local_err = NULL;
 
         kvmppc_xive_set_source_config(xive, lisn, &new_eas, &local_err);
@@ -1379,7 +1396,7 @@ static target_ulong h_int_set_queue_config(PowerPCCPU *cpu,
      */
 
 out:
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         Error *local_err = NULL;
 
         kvmppc_xive_set_queue_config(xive, end_blk, end_idx, &end, &local_err);
@@ -1480,7 +1497,7 @@ static target_ulong h_int_get_queue_config(PowerPCCPU *cpu,
         args[2] = 0;
     }
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         Error *local_err = NULL;
 
         kvmppc_xive_get_queue_config(xive, end_blk, end_idx, end, &local_err);
@@ -1642,7 +1659,7 @@ static target_ulong h_int_esb(PowerPCCPU *cpu,
         return H_P3;
     }
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         args[0] = kvmppc_xive_esb_rw(xsrc, lisn, offset, data,
                                      flags & SPAPR_XIVE_ESB_STORE);
     } else {
@@ -1717,7 +1734,7 @@ static target_ulong h_int_sync(PowerPCCPU *cpu,
      * under KVM
      */
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         Error *local_err = NULL;
 
         kvmppc_xive_sync_source(xive, lisn, &local_err);
@@ -1761,7 +1778,7 @@ static target_ulong h_int_reset(PowerPCCPU *cpu,
 
     device_legacy_reset(DEVICE(xive));
 
-    if (kvm_irqchip_in_kernel()) {
+    if (spapr_xive_in_kernel(xive)) {
         Error *local_err = NULL;
 
         kvmppc_xive_reset(xive, &local_err);
diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c
index edb7ee0..e8667ce 100644
--- a/hw/intc/spapr_xive_kvm.c
+++ b/hw/intc/spapr_xive_kvm.c
@@ -73,54 +73,54 @@ static void kvm_cpu_disable_all(void)
  * XIVE Thread Interrupt Management context (KVM)
  */
 
-void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
+int kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
 {
     SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
     uint64_t state[2];
     int ret;
 
-    /* The KVM XIVE device is not in use yet */
-    if (xive->fd == -1) {
-        return;
-    }
+    assert(xive->fd != -1);
 
     /* word0 and word1 of the OS ring. */
     state[0] = *((uint64_t *) &tctx->regs[TM_QW1_OS]);
 
     ret = kvm_set_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
     if (ret != 0) {
-        error_setg_errno(errp, errno,
+        error_setg_errno(errp, -ret,
                          "XIVE: could not restore KVM state of CPU %ld",
                          kvm_arch_vcpu_id(tctx->cs));
+        return ret;
     }
+
+    return 0;
 }
 
-void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
+int kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
 {
     SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
     uint64_t state[2] = { 0 };
     int ret;
 
-    /* The KVM XIVE device is not in use */
-    if (xive->fd == -1) {
-        return;
-    }
+    assert(xive->fd != -1);
 
     ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
     if (ret != 0) {
-        error_setg_errno(errp, errno,
+        error_setg_errno(errp, -ret,
                          "XIVE: could not capture KVM state of CPU %ld",
                          kvm_arch_vcpu_id(tctx->cs));
-        return;
+        return ret;
     }
 
     /* word0 and word1 of the OS ring. */
     *((uint64_t *) &tctx->regs[TM_QW1_OS]) = state[0];
+
+    return 0;
 }
 
 typedef struct {
     XiveTCTX *tctx;
-    Error *err;
+    Error **errp;
+    int ret;
 } XiveCpuGetState;
 
 static void kvmppc_xive_cpu_do_synchronize_state(CPUState *cpu,
@@ -128,14 +128,14 @@ static void kvmppc_xive_cpu_do_synchronize_state(CPUState *cpu,
 {
     XiveCpuGetState *s = arg.host_ptr;
 
-    kvmppc_xive_cpu_get_state(s->tctx, &s->err);
+    s->ret = kvmppc_xive_cpu_get_state(s->tctx, s->errp);
 }
 
-void kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp)
+int kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp)
 {
     XiveCpuGetState s = {
         .tctx = tctx,
-        .err = NULL,
+        .errp = errp,
     };
 
     /*
@@ -144,26 +144,21 @@ void kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp)
     run_on_cpu(tctx->cs, kvmppc_xive_cpu_do_synchronize_state,
                RUN_ON_CPU_HOST_PTR(&s));
 
-    if (s.err) {
-        error_propagate(errp, s.err);
-        return;
-    }
+    return s.ret;
 }
 
-void kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp)
+int kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp)
 {
+    ERRP_GUARD();
     SpaprXive *xive = SPAPR_XIVE(tctx->xptr);
     unsigned long vcpu_id;
     int ret;
 
-    /* The KVM XIVE device is not in use */
-    if (xive->fd == -1) {
-        return;
-    }
+    assert(xive->fd != -1);
 
     /* Check if CPU was hot unplugged and replugged. */
     if (kvm_cpu_is_enabled(tctx->cs)) {
-        return;
+        return 0;
     }
 
     vcpu_id = kvm_arch_vcpu_id(tctx->cs);
@@ -171,28 +166,26 @@ void kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp)
     ret = kvm_vcpu_enable_cap(tctx->cs, KVM_CAP_PPC_IRQ_XIVE, 0, xive->fd,
                               vcpu_id, 0);
     if (ret < 0) {
-        Error *local_err = NULL;
-
-        error_setg(&local_err,
-                   "XIVE: unable to connect CPU%ld to KVM device: %s",
-                   vcpu_id, strerror(errno));
-        if (errno == ENOSPC) {
-            error_append_hint(&local_err, "Try -smp maxcpus=N with N < %u\n",
+        error_setg_errno(errp, -ret,
+                         "XIVE: unable to connect CPU%ld to KVM device",
+                         vcpu_id);
+        if (ret == -ENOSPC) {
+            error_append_hint(errp, "Try -smp maxcpus=N with N < %u\n",
                               MACHINE(qdev_get_machine())->smp.max_cpus);
         }
-        error_propagate(errp, local_err);
-        return;
+        return ret;
     }
 
     kvm_cpu_enable(tctx->cs);
+    return 0;
 }
 
 /*
  * XIVE Interrupt Source (KVM)
  */
 
-void kvmppc_xive_set_source_config(SpaprXive *xive, uint32_t lisn, XiveEAS *eas,
-                                   Error **errp)
+int kvmppc_xive_set_source_config(SpaprXive *xive, uint32_t lisn, XiveEAS *eas,
+                                  Error **errp)
 {
     uint32_t end_idx;
     uint32_t end_blk;
@@ -201,7 +194,6 @@ void kvmppc_xive_set_source_config(SpaprXive *xive, uint32_t lisn, XiveEAS *eas,
     bool masked;
     uint32_t eisn;
     uint64_t kvm_src;
-    Error *local_err = NULL;
 
     assert(xive_eas_is_valid(eas));
 
@@ -221,12 +213,8 @@ void kvmppc_xive_set_source_config(SpaprXive *xive, uint32_t lisn, XiveEAS *eas,
     kvm_src |= ((uint64_t)eisn << KVM_XIVE_SOURCE_EISN_SHIFT) &
         KVM_XIVE_SOURCE_EISN_MASK;
 
-    kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE_CONFIG, lisn,
-                      &kvm_src, true, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
-    }
+    return kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE_CONFIG, lisn,
+                             &kvm_src, true, errp);
 }
 
 void kvmppc_xive_sync_source(SpaprXive *xive, uint32_t lisn, Error **errp)
@@ -245,10 +233,7 @@ int kvmppc_xive_source_reset_one(XiveSource *xsrc, int srcno, Error **errp)
     SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
     uint64_t state = 0;
 
-    /* The KVM XIVE device is not in use */
-    if (xive->fd == -1) {
-        return -ENODEV;
-    }
+    assert(xive->fd != -1);
 
     if (xive_source_irq_is_lsi(xsrc, srcno)) {
         state |= KVM_XIVE_LEVEL_SENSITIVE;
@@ -261,24 +246,25 @@ int kvmppc_xive_source_reset_one(XiveSource *xsrc, int srcno, Error **errp)
                              true, errp);
 }
 
-static void kvmppc_xive_source_reset(XiveSource *xsrc, Error **errp)
+static int kvmppc_xive_source_reset(XiveSource *xsrc, Error **errp)
 {
     SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
     int i;
 
     for (i = 0; i < xsrc->nr_irqs; i++) {
-        Error *local_err = NULL;
+        int ret;
 
         if (!xive_eas_is_valid(&xive->eat[i])) {
             continue;
         }
 
-        kvmppc_xive_source_reset_one(xsrc, i, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
-            return;
+        ret = kvmppc_xive_source_reset_one(xsrc, i, errp);
+        if (ret < 0) {
+            return ret;
         }
     }
+
+    return 0;
 }
 
 /*
@@ -381,15 +367,15 @@ void kvmppc_xive_source_set_irq(void *opaque, int srcno, int val)
 /*
  * sPAPR XIVE interrupt controller (KVM)
  */
-void kvmppc_xive_get_queue_config(SpaprXive *xive, uint8_t end_blk,
-                                  uint32_t end_idx, XiveEND *end,
-                                  Error **errp)
+int kvmppc_xive_get_queue_config(SpaprXive *xive, uint8_t end_blk,
+                                 uint32_t end_idx, XiveEND *end,
+                                 Error **errp)
 {
     struct kvm_ppc_xive_eq kvm_eq = { 0 };
     uint64_t kvm_eq_idx;
     uint8_t priority;
     uint32_t server;
-    Error *local_err = NULL;
+    int ret;
 
     assert(xive_end_is_valid(end));
 
@@ -401,11 +387,10 @@ void kvmppc_xive_get_queue_config(SpaprXive *xive, uint8_t end_blk,
     kvm_eq_idx |= server << KVM_XIVE_EQ_SERVER_SHIFT &
         KVM_XIVE_EQ_SERVER_MASK;
 
-    kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
-                      &kvm_eq, false, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
+    ret = kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
+                            &kvm_eq, false, errp);
+    if (ret < 0) {
+        return ret;
     }
 
     /*
@@ -415,17 +400,18 @@ void kvmppc_xive_get_queue_config(SpaprXive *xive, uint8_t end_blk,
      */
     end->w1 = xive_set_field32(END_W1_GENERATION, 0ul, kvm_eq.qtoggle) |
         xive_set_field32(END_W1_PAGE_OFF, 0ul, kvm_eq.qindex);
+
+    return 0;
 }
 
-void kvmppc_xive_set_queue_config(SpaprXive *xive, uint8_t end_blk,
-                                  uint32_t end_idx, XiveEND *end,
-                                  Error **errp)
+int kvmppc_xive_set_queue_config(SpaprXive *xive, uint8_t end_blk,
+                                 uint32_t end_idx, XiveEND *end,
+                                 Error **errp)
 {
     struct kvm_ppc_xive_eq kvm_eq = { 0 };
     uint64_t kvm_eq_idx;
     uint8_t priority;
     uint32_t server;
-    Error *local_err = NULL;
 
     /*
      * Build the KVM state from the local END structure.
@@ -463,12 +449,9 @@ void kvmppc_xive_set_queue_config(SpaprXive *xive, uint8_t end_blk,
     kvm_eq_idx |= server << KVM_XIVE_EQ_SERVER_SHIFT &
         KVM_XIVE_EQ_SERVER_MASK;
 
-    kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
-                      &kvm_eq, true, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
-    }
+    return
+        kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
+                          &kvm_eq, true, errp);
 }
 
 void kvmppc_xive_reset(SpaprXive *xive, Error **errp)
@@ -477,23 +460,24 @@ void kvmppc_xive_reset(SpaprXive *xive, Error **errp)
                       NULL, true, errp);
 }
 
-static void kvmppc_xive_get_queues(SpaprXive *xive, Error **errp)
+static int kvmppc_xive_get_queues(SpaprXive *xive, Error **errp)
 {
-    Error *local_err = NULL;
     int i;
+    int ret;
 
     for (i = 0; i < xive->nr_ends; i++) {
         if (!xive_end_is_valid(&xive->endt[i])) {
             continue;
         }
 
-        kvmppc_xive_get_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
-                                     &xive->endt[i], &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
-            return;
+        ret = kvmppc_xive_get_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
+                                           &xive->endt[i], errp);
+        if (ret < 0) {
+            return ret;
         }
     }
+
+    return 0;
 }
 
 /*
@@ -592,10 +576,7 @@ static void kvmppc_xive_change_state_handler(void *opaque, int running,
 
 void kvmppc_xive_synchronize_state(SpaprXive *xive, Error **errp)
 {
-    /* The KVM XIVE device is not in use */
-    if (xive->fd == -1) {
-        return;
-    }
+    assert(xive->fd != -1);
 
     /*
      * When the VM is stopped, the sources are masked and the previous
@@ -621,19 +602,17 @@ void kvmppc_xive_synchronize_state(SpaprXive *xive, Error **errp)
 int kvmppc_xive_pre_save(SpaprXive *xive)
 {
     Error *local_err = NULL;
+    int ret;
 
-    /* The KVM XIVE device is not in use */
-    if (xive->fd == -1) {
-        return 0;
-    }
+    assert(xive->fd != -1);
 
     /* EAT: there is no extra state to query from KVM */
 
     /* ENDT */
-    kvmppc_xive_get_queues(xive, &local_err);
-    if (local_err) {
+    ret = kvmppc_xive_get_queues(xive, &local_err);
+    if (ret < 0) {
         error_report_err(local_err);
-        return -1;
+        return ret;
     }
 
     return 0;
@@ -650,6 +629,7 @@ int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
     Error *local_err = NULL;
     CPUState *cs;
     int i;
+    int ret;
 
     /* The KVM XIVE device should be in use */
     assert(xive->fd != -1);
@@ -660,11 +640,10 @@ int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
             continue;
         }
 
-        kvmppc_xive_set_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
-                                     &xive->endt[i], &local_err);
-        if (local_err) {
-            error_report_err(local_err);
-            return -1;
+        ret = kvmppc_xive_set_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
+                                           &xive->endt[i], &local_err);
+        if (ret < 0) {
+            goto fail;
         }
     }
 
@@ -679,16 +658,14 @@ int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
          * previously set in KVM. Since we don't do that for all interrupts
          * at reset time anymore, let's do it now.
          */
-        kvmppc_xive_source_reset_one(&xive->source, i, &local_err);
-        if (local_err) {
-            error_report_err(local_err);
-            return -1;
+        ret = kvmppc_xive_source_reset_one(&xive->source, i, &local_err);
+        if (ret < 0) {
+            goto fail;
         }
 
-        kvmppc_xive_set_source_config(xive, i, &xive->eat[i], &local_err);
-        if (local_err) {
-            error_report_err(local_err);
-            return -1;
+        ret = kvmppc_xive_set_source_config(xive, i, &xive->eat[i], &local_err);
+        if (ret < 0) {
+            goto fail;
         }
     }
 
@@ -705,17 +682,21 @@ int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
     CPU_FOREACH(cs) {
         PowerPCCPU *cpu = POWERPC_CPU(cs);
 
-        kvmppc_xive_cpu_set_state(spapr_cpu_state(cpu)->tctx, &local_err);
-        if (local_err) {
-            error_report_err(local_err);
-            return -1;
+        ret = kvmppc_xive_cpu_set_state(spapr_cpu_state(cpu)->tctx, &local_err);
+        if (ret < 0) {
+            goto fail;
         }
     }
 
     /* The source states will be restored when the machine starts running */
     return 0;
+
+fail:
+    error_report_err(local_err);
+    return ret;
 }
 
+/* Returns MAP_FAILED on error and sets errno */
 static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len,
                               Error **errp)
 {
@@ -726,7 +707,6 @@ static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len,
                 pgoff << page_shift);
     if (addr == MAP_FAILED) {
         error_setg_errno(errp, errno, "XIVE: unable to set memory mapping");
-        return NULL;
     }
 
     return addr;
@@ -741,10 +721,12 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
 {
     SpaprXive *xive = SPAPR_XIVE(intc);
     XiveSource *xsrc = &xive->source;
-    Error *local_err = NULL;
-    size_t esb_len = (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
+    size_t esb_len = xive_source_esb_len(xsrc);
     size_t tima_len = 4ull << TM_SHIFT;
     CPUState *cs;
+    int fd;
+    void *addr;
+    int ret;
 
     /*
      * The KVM XIVE device already in use. This is the case when
@@ -760,18 +742,20 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
     }
 
     /* First, create the KVM XIVE device */
-    xive->fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
-    if (xive->fd < 0) {
-        error_setg_errno(errp, -xive->fd, "XIVE: error creating KVM device");
+    fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
+    if (fd < 0) {
+        error_setg_errno(errp, -fd, "XIVE: error creating KVM device");
         return -1;
     }
+    xive->fd = fd;
 
     /* Tell KVM about the # of VCPUs we may have */
     if (kvm_device_check_attr(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
                               KVM_DEV_XIVE_NR_SERVERS)) {
-        if (kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
-                              KVM_DEV_XIVE_NR_SERVERS, &nr_servers, true,
-                              &local_err)) {
+        ret = kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
+                                KVM_DEV_XIVE_NR_SERVERS, &nr_servers, true,
+                                errp);
+        if (ret < 0) {
             goto fail;
         }
     }
@@ -779,14 +763,14 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
     /*
      * 1. Source ESB pages - KVM mapping
      */
-    xsrc->esb_mmap = kvmppc_xive_mmap(xive, KVM_XIVE_ESB_PAGE_OFFSET, esb_len,
-                                      &local_err);
-    if (local_err) {
+    addr = kvmppc_xive_mmap(xive, KVM_XIVE_ESB_PAGE_OFFSET, esb_len, errp);
+    if (addr == MAP_FAILED) {
         goto fail;
     }
+    xsrc->esb_mmap = addr;
 
     memory_region_init_ram_device_ptr(&xsrc->esb_mmio_kvm, OBJECT(xsrc),
-                                      "xive.esb", esb_len, xsrc->esb_mmap);
+                                      "xive.esb-kvm", esb_len, xsrc->esb_mmap);
     memory_region_add_subregion_overlap(&xsrc->esb_mmio, 0,
                                         &xsrc->esb_mmio_kvm, 1);
 
@@ -797,11 +781,12 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
     /*
      * 3. TIMA pages - KVM mapping
      */
-    xive->tm_mmap = kvmppc_xive_mmap(xive, KVM_XIVE_TIMA_PAGE_OFFSET, tima_len,
-                                     &local_err);
-    if (local_err) {
+    addr = kvmppc_xive_mmap(xive, KVM_XIVE_TIMA_PAGE_OFFSET, tima_len, errp);
+    if (addr == MAP_FAILED) {
         goto fail;
     }
+    xive->tm_mmap = addr;
+
     memory_region_init_ram_device_ptr(&xive->tm_mmio_kvm, OBJECT(xive),
                                       "xive.tima", tima_len, xive->tm_mmap);
     memory_region_add_subregion_overlap(&xive->tm_mmio, 0,
@@ -814,15 +799,15 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
     CPU_FOREACH(cs) {
         PowerPCCPU *cpu = POWERPC_CPU(cs);
 
-        kvmppc_xive_cpu_connect(spapr_cpu_state(cpu)->tctx, &local_err);
-        if (local_err) {
+        ret = kvmppc_xive_cpu_connect(spapr_cpu_state(cpu)->tctx, errp);
+        if (ret < 0) {
             goto fail;
         }
     }
 
     /* Update the KVM sources */
-    kvmppc_xive_source_reset(xsrc, &local_err);
-    if (local_err) {
+    ret = kvmppc_xive_source_reset(xsrc, errp);
+    if (ret < 0) {
         goto fail;
     }
 
@@ -832,7 +817,6 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
     return 0;
 
 fail:
-    error_propagate(errp, local_err);
     kvmppc_xive_disconnect(intc);
     return -1;
 }
@@ -843,14 +827,11 @@ void kvmppc_xive_disconnect(SpaprInterruptController *intc)
     XiveSource *xsrc;
     size_t esb_len;
 
-    /* The KVM XIVE device is not in use */
-    if (!xive || xive->fd == -1) {
-        return;
-    }
+    assert(xive->fd != -1);
 
     /* Clear the KVM mapping */
     xsrc = &xive->source;
-    esb_len = (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
+    esb_len = xive_source_esb_len(xsrc);
 
     if (xsrc->esb_mmap) {
         memory_region_del_subregion(&xsrc->esb_mmio, &xsrc->esb_mmio_kvm);
@@ -871,10 +852,8 @@ void kvmppc_xive_disconnect(SpaprInterruptController *intc)
      * and removed from the list of devices of the VM. The VCPU
      * presenters are also detached from the device.
      */
-    if (xive->fd != -1) {
-        close(xive->fd);
-        xive->fd = -1;
-    }
+    close(xive->fd);
+    xive->fd = -1;
 
     kvm_kernel_irqchip = false;
     kvm_msi_via_irqfd_allowed = false;
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 9a16243..489e625 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -592,6 +592,17 @@ static const char * const xive_tctx_ring_names[] = {
     "USER", "OS", "POOL", "PHYS",
 };
 
+/*
+ * kvm_irqchip_in_kernel() will cause the compiler to turn this
+ * info a nop if CONFIG_KVM isn't defined.
+ */
+#define xive_in_kernel(xptr)                                            \
+    (kvm_irqchip_in_kernel() &&                                         \
+     ({                                                                 \
+         XivePresenterClass *xpc = XIVE_PRESENTER_GET_CLASS(xptr);      \
+         xpc->in_kernel ? xpc->in_kernel(xptr) : false;                 \
+     }))
+
 void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon)
 {
     int cpu_index;
@@ -606,7 +617,7 @@ void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon)
 
     cpu_index = tctx->cs ? tctx->cs->cpu_index : -1;
 
-    if (kvm_irqchip_in_kernel()) {
+    if (xive_in_kernel(tctx->xptr)) {
         Error *local_err = NULL;
 
         kvmppc_xive_cpu_synchronize_state(tctx, &local_err);
@@ -651,7 +662,6 @@ static void xive_tctx_realize(DeviceState *dev, Error **errp)
     XiveTCTX *tctx = XIVE_TCTX(dev);
     PowerPCCPU *cpu;
     CPUPPCState *env;
-    Error *local_err = NULL;
 
     assert(tctx->cs);
     assert(tctx->xptr);
@@ -671,10 +681,8 @@ static void xive_tctx_realize(DeviceState *dev, Error **errp)
     }
 
     /* Connect the presenter to the VCPU (required for CPU hotplug) */
-    if (kvm_irqchip_in_kernel()) {
-        kvmppc_xive_cpu_connect(tctx, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
+    if (xive_in_kernel(tctx->xptr)) {
+        if (kvmppc_xive_cpu_connect(tctx, errp) < 0) {
             return;
         }
     }
@@ -682,13 +690,15 @@ static void xive_tctx_realize(DeviceState *dev, Error **errp)
 
 static int vmstate_xive_tctx_pre_save(void *opaque)
 {
+    XiveTCTX *tctx = XIVE_TCTX(opaque);
     Error *local_err = NULL;
+    int ret;
 
-    if (kvm_irqchip_in_kernel()) {
-        kvmppc_xive_cpu_get_state(XIVE_TCTX(opaque), &local_err);
-        if (local_err) {
+    if (xive_in_kernel(tctx->xptr)) {
+        ret = kvmppc_xive_cpu_get_state(tctx, &local_err);
+        if (ret < 0) {
             error_report_err(local_err);
-            return -1;
+            return ret;
         }
     }
 
@@ -697,17 +707,19 @@ static int vmstate_xive_tctx_pre_save(void *opaque)
 
 static int vmstate_xive_tctx_post_load(void *opaque, int version_id)
 {
+    XiveTCTX *tctx = XIVE_TCTX(opaque);
     Error *local_err = NULL;
+    int ret;
 
-    if (kvm_irqchip_in_kernel()) {
+    if (xive_in_kernel(tctx->xptr)) {
         /*
          * Required for hotplugged CPU, for which the state comes
          * after all states of the machine.
          */
-        kvmppc_xive_cpu_set_state(XIVE_TCTX(opaque), &local_err);
-        if (local_err) {
+        ret = kvmppc_xive_cpu_set_state(tctx, &local_err);
+        if (ret < 0) {
             error_report_err(local_err);
-            return -1;
+            return ret;
         }
     }
 
@@ -1128,6 +1140,7 @@ static void xive_source_reset(void *dev)
 static void xive_source_realize(DeviceState *dev, Error **errp)
 {
     XiveSource *xsrc = XIVE_SOURCE(dev);
+    size_t esb_len = xive_source_esb_len(xsrc);
 
     assert(xsrc->xive);
 
@@ -1147,11 +1160,11 @@ static void xive_source_realize(DeviceState *dev, Error **errp)
     xsrc->status = g_malloc0(xsrc->nr_irqs);
     xsrc->lsi_map = bitmap_new(xsrc->nr_irqs);
 
-    if (!kvm_irqchip_in_kernel()) {
-        memory_region_init_io(&xsrc->esb_mmio, OBJECT(xsrc),
-                              &xive_source_esb_ops, xsrc, "xive.esb",
-                              (1ull << xsrc->esb_shift) * xsrc->nr_irqs);
-    }
+    memory_region_init(&xsrc->esb_mmio, OBJECT(xsrc), "xive.esb", esb_len);
+    memory_region_init_io(&xsrc->esb_mmio_emulated, OBJECT(xsrc),
+                          &xive_source_esb_ops, xsrc, "xive.esb-emulated",
+                          esb_len);
+    memory_region_add_subregion(&xsrc->esb_mmio, 0, &xsrc->esb_mmio_emulated);
 
     qemu_register_reset(xive_source_reset, dev);
 }
@@ -1502,7 +1515,7 @@ static bool xive_presenter_notify(XiveFabric *xfb, uint8_t format,
 
 /*
  * Notification using the END ESe/ESn bit (Event State Buffer for
- * escalation and notification). Profide futher coalescing in the
+ * escalation and notification). Provide further coalescing in the
  * Router.
  */
 static bool xive_router_end_es_notify(XiveRouter *xrtr, uint8_t end_blk,
@@ -1581,7 +1594,7 @@ static void xive_router_end_notify(XiveRouter *xrtr, uint8_t end_blk,
 
     /*
      * Check the END ESn (Event State Buffer for notification) for
-     * even futher coalescing in the Router
+     * even further coalescing in the Router
      */
     if (!xive_end_is_notify(&end)) {
         /* ESn[Q]=1 : end of notification */
@@ -1660,7 +1673,7 @@ do_escalation:
 
     /*
      * Check the END ESe (Event State Buffer for escalation) for even
-     * futher coalescing in the Router
+     * further coalescing in the Router
      */
     if (!xive_end_is_uncond_escalation(&end)) {
         /* ESe[Q]=1 : end of notification */
diff --git a/hw/nvram/chrp_nvram.c b/hw/nvram/chrp_nvram.c
index d969f26..d4d10a7 100644
--- a/hw/nvram/chrp_nvram.c
+++ b/hw/nvram/chrp_nvram.c
@@ -21,14 +21,21 @@
 
 #include "qemu/osdep.h"
 #include "qemu/cutils.h"
+#include "qemu/error-report.h"
 #include "hw/nvram/chrp_nvram.h"
 #include "sysemu/sysemu.h"
 
-static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str)
+static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str,
+                              int max_len)
 {
     int len;
 
     len = strlen(str) + 1;
+
+    if (max_len < len) {
+        return -1;
+    }
+
     memcpy(&nvram[addr], str, len);
 
     return addr + len;
@@ -38,19 +45,26 @@ static int chrp_nvram_set_var(uint8_t *nvram, int addr, const char *str)
  * Create a "system partition", used for the Open Firmware
  * environment variables.
  */
-int chrp_nvram_create_system_partition(uint8_t *data, int min_len)
+int chrp_nvram_create_system_partition(uint8_t *data, int min_len, int max_len)
 {
     ChrpNvramPartHdr *part_header;
     unsigned int i;
     int end;
 
+    if (max_len < sizeof(*part_header)) {
+        goto fail;
+    }
+
     part_header = (ChrpNvramPartHdr *)data;
     part_header->signature = CHRP_NVPART_SYSTEM;
     pstrcpy(part_header->name, sizeof(part_header->name), "system");
 
     end = sizeof(ChrpNvramPartHdr);
     for (i = 0; i < nb_prom_envs; i++) {
-        end = chrp_nvram_set_var(data, end, prom_envs[i]);
+        end = chrp_nvram_set_var(data, end, prom_envs[i], max_len - end);
+        if (end == -1) {
+            goto fail;
+        }
     }
 
     /* End marker */
@@ -65,6 +79,10 @@ int chrp_nvram_create_system_partition(uint8_t *data, int min_len)
     chrp_nvram_finish_partition(part_header, end);
 
     return end;
+
+fail:
+    error_report("NVRAM is too small. Try to pass less data to -prom-env");
+    exit(EXIT_FAILURE);
 }
 
 /**
diff --git a/hw/nvram/mac_nvram.c b/hw/nvram/mac_nvram.c
index beec1c4..11f2d31 100644
--- a/hw/nvram/mac_nvram.c
+++ b/hw/nvram/mac_nvram.c
@@ -141,7 +141,7 @@ static void pmac_format_nvram_partition_of(MacIONVRAMState *nvr, int off,
 
     /* OpenBIOS nvram variables partition */
     sysp_end = chrp_nvram_create_system_partition(&nvr->data[off],
-                                                  DEF_SYSTEM_SIZE) + off;
+                                                  DEF_SYSTEM_SIZE, len) + off;
 
     /* Free space partition */
     chrp_nvram_create_free_partition(&nvr->data[sysp_end], len - sysp_end);
diff --git a/hw/nvram/spapr_nvram.c b/hw/nvram/spapr_nvram.c
index 15d0828..3865134 100644
--- a/hw/nvram/spapr_nvram.c
+++ b/hw/nvram/spapr_nvram.c
@@ -188,7 +188,8 @@ static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp)
         }
     } else if (nb_prom_envs > 0) {
         /* Create a system partition to pass the -prom-env variables */
-        chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4);
+        chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4,
+                                           nvram->size);
         chrp_nvram_create_free_partition(&nvram->buf[MIN_NVRAM_SIZE / 4],
                                          nvram->size - MIN_NVRAM_SIZE / 4);
     }
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 1c8d098..dd2fa48 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -558,7 +558,8 @@ static int spapr_dt_dynamic_reconfiguration_memory(SpaprMachineState *spapr,
     int nb_numa_nodes = machine->numa_state->num_nodes;
     int ret, i, offset;
     uint64_t lmb_size = SPAPR_MEMORY_BLOCK_SIZE;
-    uint32_t prop_lmb_size[] = {0, cpu_to_be32(lmb_size)};
+    uint32_t prop_lmb_size[] = {cpu_to_be32(lmb_size >> 32),
+                                cpu_to_be32(lmb_size & 0xffffffff)};
     uint32_t *int_buf, *cur_index, buf_len;
     int nr_nodes = nb_numa_nodes ? nb_numa_nodes : 1;
     MemoryDeviceInfoList *dimms = NULL;
@@ -905,7 +906,8 @@ static void spapr_dt_rtas(SpaprMachineState *spapr, void *fdt)
     uint32_t lrdr_capacity[] = {
         cpu_to_be32(max_device_addr >> 32),
         cpu_to_be32(max_device_addr & 0xffffffff),
-        0, cpu_to_be32(SPAPR_MEMORY_BLOCK_SIZE),
+        cpu_to_be32(SPAPR_MEMORY_BLOCK_SIZE >> 32),
+        cpu_to_be32(SPAPR_MEMORY_BLOCK_SIZE & 0xffffffff),
         cpu_to_be32(ms->smp.max_cpus / ms->smp.threads),
     };
     uint32_t maxdomain = cpu_to_be32(spapr->gpu_numa_id > 1 ? 1 : 0);
diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 3225fc5..10a80a8 100644
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -180,24 +180,24 @@ static void spapr_cap_set_pagesize(Object *obj, Visitor *v, const char *name,
 
 static void cap_htm_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
     if (!val) {
         /* TODO: We don't support disabling htm yet */
         return;
     }
     if (tcg_enabled()) {
-        error_setg(errp,
-                   "No Transactional Memory support in TCG,"
-                   " try appending -machine cap-htm=off");
+        error_setg(errp, "No Transactional Memory support in TCG");
+        error_append_hint(errp, "Try appending -machine cap-htm=off\n");
     } else if (kvm_enabled() && !kvmppc_has_cap_htm()) {
         error_setg(errp,
-"KVM implementation does not support Transactional Memory,"
-                   " try appending -machine cap-htm=off"
-            );
+                   "KVM implementation does not support Transactional Memory");
+        error_append_hint(errp, "Try appending -machine cap-htm=off\n");
     }
 }
 
 static void cap_vsx_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
     CPUPPCState *env = &cpu->env;
 
@@ -209,13 +209,14 @@ static void cap_vsx_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
      * rid of anything that doesn't do VMX */
     g_assert(env->insns_flags & PPC_ALTIVEC);
     if (!(env->insns_flags2 & PPC2_VSX)) {
-        error_setg(errp, "VSX support not available,"
-                   " try appending -machine cap-vsx=off");
+        error_setg(errp, "VSX support not available");
+        error_append_hint(errp, "Try appending -machine cap-vsx=off\n");
     }
 }
 
 static void cap_dfp_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
     CPUPPCState *env = &cpu->env;
 
@@ -224,8 +225,8 @@ static void cap_dfp_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
         return;
     }
     if (!(env->insns_flags2 & PPC2_DFP)) {
-        error_setg(errp, "DFP support not available,"
-                   " try appending -machine cap-dfp=off");
+        error_setg(errp, "DFP support not available");
+        error_append_hint(errp, "Try appending -machine cap-dfp=off\n");
     }
 }
 
@@ -239,6 +240,7 @@ SpaprCapPossible cap_cfpc_possible = {
 static void cap_safe_cache_apply(SpaprMachineState *spapr, uint8_t val,
                                  Error **errp)
 {
+    ERRP_GUARD();
     uint8_t kvm_val =  kvmppc_get_cap_safe_cache();
 
     if (tcg_enabled() && val) {
@@ -247,9 +249,9 @@ static void cap_safe_cache_apply(SpaprMachineState *spapr, uint8_t val,
                     cap_cfpc_possible.vals[val]);
     } else if (kvm_enabled() && (val > kvm_val)) {
         error_setg(errp,
-                   "Requested safe cache capability level not supported by kvm,"
-                   " try appending -machine cap-cfpc=%s",
-                   cap_cfpc_possible.vals[kvm_val]);
+                   "Requested safe cache capability level not supported by KVM");
+        error_append_hint(errp, "Try appending -machine cap-cfpc=%s\n",
+                          cap_cfpc_possible.vals[kvm_val]);
     }
 }
 
@@ -263,6 +265,7 @@ SpaprCapPossible cap_sbbc_possible = {
 static void cap_safe_bounds_check_apply(SpaprMachineState *spapr, uint8_t val,
                                         Error **errp)
 {
+    ERRP_GUARD();
     uint8_t kvm_val =  kvmppc_get_cap_safe_bounds_check();
 
     if (tcg_enabled() && val) {
@@ -271,9 +274,9 @@ static void cap_safe_bounds_check_apply(SpaprMachineState *spapr, uint8_t val,
                     cap_sbbc_possible.vals[val]);
     } else if (kvm_enabled() && (val > kvm_val)) {
         error_setg(errp,
-"Requested safe bounds check capability level not supported by kvm,"
-                   " try appending -machine cap-sbbc=%s",
-                   cap_sbbc_possible.vals[kvm_val]);
+"Requested safe bounds check capability level not supported by KVM");
+        error_append_hint(errp, "Try appending -machine cap-sbbc=%s\n",
+                          cap_sbbc_possible.vals[kvm_val]);
     }
 }
 
@@ -290,6 +293,7 @@ SpaprCapPossible cap_ibs_possible = {
 static void cap_safe_indirect_branch_apply(SpaprMachineState *spapr,
                                            uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
     uint8_t kvm_val = kvmppc_get_cap_safe_indirect_branch();
 
     if (tcg_enabled() && val) {
@@ -298,9 +302,9 @@ static void cap_safe_indirect_branch_apply(SpaprMachineState *spapr,
                     cap_ibs_possible.vals[val]);
     } else if (kvm_enabled() && (val > kvm_val)) {
         error_setg(errp,
-"Requested safe indirect branch capability level not supported by kvm,"
-                   " try appending -machine cap-ibs=%s",
-                   cap_ibs_possible.vals[kvm_val]);
+"Requested safe indirect branch capability level not supported by KVM");
+        error_append_hint(errp, "Try appending -machine cap-ibs=%s\n",
+                          cap_ibs_possible.vals[kvm_val]);
     }
 }
 
@@ -377,23 +381,35 @@ static void cap_hpt_maxpagesize_cpu_apply(SpaprMachineState *spapr,
 static void cap_nested_kvm_hv_apply(SpaprMachineState *spapr,
                                     uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
+    PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
+
     if (!val) {
         /* capability disabled by default */
         return;
     }
 
     if (tcg_enabled()) {
-        error_setg(errp,
-                   "No Nested KVM-HV support in tcg,"
-                   " try appending -machine cap-nested-hv=off");
+        error_setg(errp, "No Nested KVM-HV support in TCG");
+        error_append_hint(errp, "Try appending -machine cap-nested-hv=off\n");
     } else if (kvm_enabled()) {
+        if (!ppc_check_compat(cpu, CPU_POWERPC_LOGICAL_3_00, 0,
+                              spapr->max_compat_pvr)) {
+            error_setg(errp, "Nested KVM-HV only supported on POWER9");
+            error_append_hint(errp,
+                              "Try appending -machine max-cpu-compat=power9\n");
+            return;
+        }
+
         if (!kvmppc_has_cap_nested_kvm_hv()) {
             error_setg(errp,
-"KVM implementation does not support Nested KVM-HV,"
-                       " try appending -machine cap-nested-hv=off");
+                       "KVM implementation does not support Nested KVM-HV");
+            error_append_hint(errp,
+                              "Try appending -machine cap-nested-hv=off\n");
         } else if (kvmppc_set_cap_nested_kvm_hv(val) < 0) {
-                error_setg(errp,
-"Error enabling cap-nested-hv with KVM, try cap-nested-hv=off");
+                error_setg(errp, "Error enabling cap-nested-hv with KVM");
+                error_append_hint(errp,
+                                  "Try appending -machine cap-nested-hv=off\n");
         }
     }
 }
@@ -401,6 +417,7 @@ static void cap_nested_kvm_hv_apply(SpaprMachineState *spapr,
 static void cap_large_decr_apply(SpaprMachineState *spapr,
                                  uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
     PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 
@@ -411,22 +428,23 @@ static void cap_large_decr_apply(SpaprMachineState *spapr,
     if (tcg_enabled()) {
         if (!ppc_check_compat(cpu, CPU_POWERPC_LOGICAL_3_00, 0,
                               spapr->max_compat_pvr)) {
-            error_setg(errp,
-                "Large decrementer only supported on POWER9, try -cpu POWER9");
+            error_setg(errp, "Large decrementer only supported on POWER9");
+            error_append_hint(errp, "Try -cpu POWER9\n");
             return;
         }
     } else if (kvm_enabled()) {
         int kvm_nr_bits = kvmppc_get_cap_large_decr();
 
         if (!kvm_nr_bits) {
-            error_setg(errp,
-                       "No large decrementer support,"
-                        " try appending -machine cap-large-decr=off");
+            error_setg(errp, "No large decrementer support");
+            error_append_hint(errp,
+                              "Try appending -machine cap-large-decr=off\n");
         } else if (pcc->lrg_decr_bits != kvm_nr_bits) {
             error_setg(errp,
-"KVM large decrementer size (%d) differs to model (%d),"
-                " try appending -machine cap-large-decr=off",
-                kvm_nr_bits, pcc->lrg_decr_bits);
+                       "KVM large decrementer size (%d) differs to model (%d)",
+                       kvm_nr_bits, pcc->lrg_decr_bits);
+            error_append_hint(errp,
+                              "Try appending -machine cap-large-decr=off\n");
         }
     }
 }
@@ -435,14 +453,15 @@ static void cap_large_decr_cpu_apply(SpaprMachineState *spapr,
                                      PowerPCCPU *cpu,
                                      uint8_t val, Error **errp)
 {
+    ERRP_GUARD();
     CPUPPCState *env = &cpu->env;
     target_ulong lpcr = env->spr[SPR_LPCR];
 
     if (kvm_enabled()) {
         if (kvmppc_enable_cap_large_decr(cpu, val)) {
-            error_setg(errp,
-                       "No large decrementer support,"
-                       " try appending -machine cap-large-decr=off");
+            error_setg(errp, "No large decrementer support");
+            error_append_hint(errp,
+                              "Try appending -machine cap-large-decr=off\n");
         }
     }
 
@@ -457,6 +476,7 @@ static void cap_large_decr_cpu_apply(SpaprMachineState *spapr,
 static void cap_ccf_assist_apply(SpaprMachineState *spapr, uint8_t val,
                                  Error **errp)
 {
+    ERRP_GUARD();
     uint8_t kvm_val = kvmppc_get_cap_count_cache_flush_assist();
 
     if (tcg_enabled() && val) {
@@ -479,14 +499,15 @@ static void cap_ccf_assist_apply(SpaprMachineState *spapr, uint8_t val,
             return;
         }
         error_setg(errp,
-"Requested count cache flush assist capability level not supported by kvm,"
-                   " try appending -machine cap-ccf-assist=off");
+                   "Requested count cache flush assist capability level not supported by KVM");
+        error_append_hint(errp, "Try appending -machine cap-ccf-assist=off\n");
     }
 }
 
 static void cap_fwnmi_apply(SpaprMachineState *spapr, uint8_t val,
                                 Error **errp)
 {
+    ERRP_GUARD();
     if (!val) {
         return; /* Disabled by default */
     }
diff --git a/hw/ppc/spapr_irq.c b/hw/ppc/spapr_irq.c
index 2f8f7d6..72bb938 100644
--- a/hw/ppc/spapr_irq.c
+++ b/hw/ppc/spapr_irq.c
@@ -139,6 +139,7 @@ SpaprIrq spapr_irq_dual = {
 
 static int spapr_irq_check(SpaprMachineState *spapr, Error **errp)
 {
+    ERRP_GUARD();
     MachineState *machine = MACHINE(spapr);
 
     /*
@@ -179,14 +180,19 @@ static int spapr_irq_check(SpaprMachineState *spapr, Error **errp)
 
     /*
      * On a POWER9 host, some older KVM XICS devices cannot be destroyed and
-     * re-created. Detect that early to avoid QEMU to exit later when the
-     * guest reboots.
+     * re-created. Same happens with KVM nested guests. Detect that early to
+     * avoid QEMU to exit later when the guest reboots.
      */
     if (kvm_enabled() &&
         spapr->irq == &spapr_irq_dual &&
         kvm_kernel_irqchip_required() &&
         xics_kvm_has_broken_disconnect(spapr)) {
-        error_setg(errp, "KVM is too old to support ic-mode=dual,kernel-irqchip=on");
+        error_setg(errp,
+            "KVM is incompatible with ic-mode=dual,kernel-irqchip=on");
+        error_append_hint(errp,
+            "This can happen with an old KVM or in a KVM nested guest.\n");
+        error_append_hint(errp,
+            "Try without kernel-irqchip or with kernel-irqchip=off.\n");
         return -1;
     }
 
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 363cdb3..0a418f1 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1796,6 +1796,7 @@ static void spapr_phb_destroy_msi(gpointer opaque)
 
 static void spapr_phb_realize(DeviceState *dev, Error **errp)
 {
+    ERRP_GUARD();
     /* We don't use SPAPR_MACHINE() in order to exit gracefully if the user
      * tries to add a sPAPR PHB to a non-pseries machine.
      */
@@ -1813,7 +1814,6 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
     uint64_t msi_window_size = 4096;
     SpaprTceTable *tcet;
     const unsigned windows_supported = spapr_phb_windows_supported(sphb);
-    Error *local_err = NULL;
 
     if (!spapr) {
         error_setg(errp, TYPE_SPAPR_PCI_HOST_BRIDGE " needs a pseries machine");
@@ -1964,13 +1964,12 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
 
     /* Initialize the LSI table */
     for (i = 0; i < PCI_NUM_PINS; i++) {
-        uint32_t irq = SPAPR_IRQ_PCI_LSI + sphb->index * PCI_NUM_PINS + i;
+        int irq = SPAPR_IRQ_PCI_LSI + sphb->index * PCI_NUM_PINS + i;
 
         if (smc->legacy_irq_allocation) {
-            irq = spapr_irq_findone(spapr, &local_err);
-            if (local_err) {
-                error_propagate_prepend(errp, local_err,
-                                        "can't allocate LSIs: ");
+            irq = spapr_irq_findone(spapr, errp);
+            if (irq < 0) {
+                error_prepend(errp, "can't allocate LSIs: ");
                 /*
                  * Older machines will never support PHB hotplug, ie, this is an
                  * init only path and QEMU will terminate. No need to rollback.
@@ -1979,9 +1978,8 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
             }
         }
 
-        spapr_irq_claim(spapr, irq, true, &local_err);
-        if (local_err) {
-            error_propagate_prepend(errp, local_err, "can't allocate LSIs: ");
+        if (spapr_irq_claim(spapr, irq, true, errp) < 0) {
+            error_prepend(errp, "can't allocate LSIs: ");
             goto unrealize;
         }
 
diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index 9be9304..cf7dfa4 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -143,7 +143,7 @@ static void nvram_init(Nvram *nvram, uint8_t *macaddr,
     memset(image, '\0', sizeof(image));
 
     /* OpenBIOS nvram variables partition */
-    sysp_end = chrp_nvram_create_system_partition(image, 0);
+    sysp_end = chrp_nvram_create_system_partition(image, 0, 0x1fd0);
 
     /* Free space partition */
     chrp_nvram_create_free_partition(&image[sysp_end], 0x1fd0 - sysp_end);
diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index 9e30203..37310b7 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -136,7 +136,7 @@ static int sun4u_NVRAM_set_params(Nvram *nvram, uint16_t NVRAM_size,
     memset(image, '\0', sizeof(image));
 
     /* OpenBIOS nvram variables partition */
-    sysp_end = chrp_nvram_create_system_partition(image, 0);
+    sysp_end = chrp_nvram_create_system_partition(image, 0, 0x1fd0);
 
     /* Free space partition */
     chrp_nvram_create_free_partition(&image[sysp_end], 0x1fd0 - sysp_end);