spapr: add hcalls support for the XIVE exploitation interrupt mode

The different XIVE virtualization structures (sources and event queues)
are configured with a set of Hypervisor calls :

 - H_INT_GET_SOURCE_INFO

   used to obtain the address of the MMIO page of the Event State
   Buffer (ESB) entry associated with the source.

 - H_INT_SET_SOURCE_CONFIG

   assigns a source to a "target".

 - H_INT_GET_SOURCE_CONFIG

   determines which "target" and "priority" is assigned to a source

 - H_INT_GET_QUEUE_INFO

   returns the address of the notification management page associated
   with the specified "target" and "priority".

 - H_INT_SET_QUEUE_CONFIG

   sets or resets the event queue for a given "target" and "priority".
   It is also used to set the notification configuration associated
   with the queue, only unconditional notification is supported for
   the moment. Reset is performed with a queue size of 0 and queueing
   is disabled in that case.

 - H_INT_GET_QUEUE_CONFIG

   returns the queue settings for a given "target" and "priority".

 - H_INT_RESET

   resets all of the guest's internal interrupt structures to their
   initial state, losing all configuration set via the hcalls
   H_INT_SET_SOURCE_CONFIG and H_INT_SET_QUEUE_CONFIG.

 - H_INT_SYNC

   issue a synchronisation on a source to make sure all notifications
   have reached their queue.

Calls that still need to be addressed :

   H_INT_SET_OS_REPORTING_LINE
   H_INT_GET_OS_REPORTING_LINE

See the code for more documentation on each hcall.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
[dwg: Folded in fix for field accessors]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 982 insertions, 0 deletions

diff --git a/hw/intc/spapr_xive.c b/hw/intc/spapr_xive.c
index d6291c6470..9f2820039c 100644
--- a/hw/intc/spapr_xive.c
+++ b/hw/intc/spapr_xive.c
@@ -39,6 +39,13 @@
 #define SPAPR_XIVE_NVT_BASE 0x400
 
 /*
+ * The sPAPR machine has a unique XIVE IC device. Assign a fixed value
+ * to the controller block id value. It can nevertheless be changed
+ * for testing purpose.
+ */
+#define SPAPR_XIVE_BLOCK_ID 0x0
+
+/*
  * sPAPR NVT and END indexing helpers
  */
 static uint32_t spapr_xive_nvt_to_target(uint8_t nvt_blk, uint32_t nvt_idx)
@@ -46,6 +53,64 @@ static uint32_t spapr_xive_nvt_to_target(uint8_t nvt_blk, uint32_t nvt_idx)
     return nvt_idx - SPAPR_XIVE_NVT_BASE;
 }
 
+static void spapr_xive_cpu_to_nvt(PowerPCCPU *cpu,
+                                  uint8_t *out_nvt_blk, uint32_t *out_nvt_idx)
+{
+    assert(cpu);
+
+    if (out_nvt_blk) {
+        *out_nvt_blk = SPAPR_XIVE_BLOCK_ID;
+    }
+
+    if (out_nvt_blk) {
+        *out_nvt_idx = SPAPR_XIVE_NVT_BASE + cpu->vcpu_id;
+    }
+}
+
+static int spapr_xive_target_to_nvt(uint32_t target,
+                                    uint8_t *out_nvt_blk, uint32_t *out_nvt_idx)
+{
+    PowerPCCPU *cpu = spapr_find_cpu(target);
+
+    if (!cpu) {
+        return -1;
+    }
+
+    spapr_xive_cpu_to_nvt(cpu, out_nvt_blk, out_nvt_idx);
+    return 0;
+}
+
+/*
+ * sPAPR END indexing uses a simple mapping of the CPU vcpu_id, 8
+ * priorities per CPU
+ */
+static void spapr_xive_cpu_to_end(PowerPCCPU *cpu, uint8_t prio,
+                                  uint8_t *out_end_blk, uint32_t *out_end_idx)
+{
+    assert(cpu);
+
+    if (out_end_blk) {
+        *out_end_blk = SPAPR_XIVE_BLOCK_ID;
+    }
+
+    if (out_end_idx) {
+        *out_end_idx = (cpu->vcpu_id << 3) + prio;
+    }
+}
+
+static int spapr_xive_target_to_end(uint32_t target, uint8_t prio,
+                                    uint8_t *out_end_blk, uint32_t *out_end_idx)
+{
+    PowerPCCPU *cpu = spapr_find_cpu(target);
+
+    if (!cpu) {
+        return -1;
+    }
+
+    spapr_xive_cpu_to_end(cpu, prio, out_end_blk, out_end_idx);
+    return 0;
+}
+
 /*
  * On sPAPR machines, use a simplified output for the XIVE END
  * structure dumping only the information related to the OS EQ.
@@ -418,3 +483,920 @@ qemu_irq spapr_xive_qirq(sPAPRXive *xive, uint32_t lisn)
 
     return xive_source_qirq(xsrc, lisn);
 }
+
+/*
+ * XIVE hcalls
+ *
+ * The terminology used by the XIVE hcalls is the following :
+ *
+ *   TARGET vCPU number
+ *   EQ     Event Queue assigned by OS to receive event data
+ *   ESB    page for source interrupt management
+ *   LISN   Logical Interrupt Source Number identifying a source in the
+ *          machine
+ *   EISN   Effective Interrupt Source Number used by guest OS to
+ *          identify source in the guest
+ *
+ * The EAS, END, NVT structures are not exposed.
+ */
+
+/*
+ * Linux hosts under OPAL reserve priority 7 for their own escalation
+ * interrupts (DD2.X POWER9). So we only allow the guest to use
+ * priorities [0..6].
+ */
+static bool spapr_xive_priority_is_reserved(uint8_t priority)
+{
+    switch (priority) {
+    case 0 ... 6:
+        return false;
+    case 7: /* OPAL escalation queue */
+    default:
+        return true;
+    }
+}
+
+/*
+ * The H_INT_GET_SOURCE_INFO hcall() is used to obtain the logical
+ * real address of the MMIO page through which the Event State Buffer
+ * entry associated with the value of the "lisn" parameter is managed.
+ *
+ * Parameters:
+ * Input
+ * - R4: "flags"
+ *         Bits 0-63 reserved
+ * - R5: "lisn" is per "interrupts", "interrupt-map", or
+ *       "ibm,xive-lisn-ranges" properties, or as returned by the
+ *       ibm,query-interrupt-source-number RTAS call, or as returned
+ *       by the H_ALLOCATE_VAS_WINDOW hcall
+ *
+ * Output
+ * - R4: "flags"
+ *         Bits 0-59: Reserved
+ *         Bit 60: H_INT_ESB must be used for Event State Buffer
+ *                 management
+ *         Bit 61: 1 == LSI  0 == MSI
+ *         Bit 62: the full function page supports trigger
+ *         Bit 63: Store EOI Supported
+ * - R5: Logical Real address of full function Event State Buffer
+ *       management page, -1 if H_INT_ESB hcall flag is set to 1.
+ * - R6: Logical Real Address of trigger only Event State Buffer
+ *       management page or -1.
+ * - R7: Power of 2 page size for the ESB management pages returned in
+ *       R5 and R6.
+ */
+
+#define SPAPR_XIVE_SRC_H_INT_ESB     PPC_BIT(60) /* ESB manage with H_INT_ESB */
+#define SPAPR_XIVE_SRC_LSI           PPC_BIT(61) /* Virtual LSI type */
+#define SPAPR_XIVE_SRC_TRIGGER       PPC_BIT(62) /* Trigger and management
+                                                    on same page */
+#define SPAPR_XIVE_SRC_STORE_EOI     PPC_BIT(63) /* Store EOI support */
+
+static target_ulong h_int_get_source_info(PowerPCCPU *cpu,
+                                          sPAPRMachineState *spapr,
+                                          target_ulong opcode,
+                                          target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    XiveSource *xsrc = &xive->source;
+    target_ulong flags  = args[0];
+    target_ulong lisn   = args[1];
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags) {
+        return H_PARAMETER;
+    }
+
+    if (lisn >= xive->nr_irqs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    if (!xive_eas_is_valid(&xive->eat[lisn])) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    /*
+     * All sources are emulated under the main XIVE object and share
+     * the same characteristics.
+     */
+    args[0] = 0;
+    if (!xive_source_esb_has_2page(xsrc)) {
+        args[0] |= SPAPR_XIVE_SRC_TRIGGER;
+    }
+    if (xsrc->esb_flags & XIVE_SRC_STORE_EOI) {
+        args[0] |= SPAPR_XIVE_SRC_STORE_EOI;
+    }
+
+    /*
+     * Force the use of the H_INT_ESB hcall in case of an LSI
+     * interrupt. This is necessary under KVM to re-trigger the
+     * interrupt if the level is still asserted
+     */
+    if (xive_source_irq_is_lsi(xsrc, lisn)) {
+        args[0] |= SPAPR_XIVE_SRC_H_INT_ESB | SPAPR_XIVE_SRC_LSI;
+    }
+
+    if (!(args[0] & SPAPR_XIVE_SRC_H_INT_ESB)) {
+        args[1] = xive->vc_base + xive_source_esb_mgmt(xsrc, lisn);
+    } else {
+        args[1] = -1;
+    }
+
+    if (xive_source_esb_has_2page(xsrc) &&
+        !(args[0] & SPAPR_XIVE_SRC_H_INT_ESB)) {
+        args[2] = xive->vc_base + xive_source_esb_page(xsrc, lisn);
+    } else {
+        args[2] = -1;
+    }
+
+    if (xive_source_esb_has_2page(xsrc)) {
+        args[3] = xsrc->esb_shift - 1;
+    } else {
+        args[3] = xsrc->esb_shift;
+    }
+
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_SET_SOURCE_CONFIG hcall() is used to assign a Logical
+ * Interrupt Source to a target. The Logical Interrupt Source is
+ * designated with the "lisn" parameter and the target is designated
+ * with the "target" and "priority" parameters.  Upon return from the
+ * hcall(), no additional interrupts will be directed to the old EQ.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-61: Reserved
+ *         Bit 62: set the "eisn" in the EAS
+ *         Bit 63: masks the interrupt source in the hardware interrupt
+ *       control structure. An interrupt masked by this mechanism will
+ *       be dropped, but it's source state bits will still be
+ *       set. There is no race-free way of unmasking and restoring the
+ *       source. Thus this should only be used in interrupts that are
+ *       also masked at the source, and only in cases where the
+ *       interrupt is not meant to be used for a large amount of time
+ *       because no valid target exists for it for example
+ * - R5: "lisn" is per "interrupts", "interrupt-map", or
+ *       "ibm,xive-lisn-ranges" properties, or as returned by the
+ *       ibm,query-interrupt-source-number RTAS call, or as returned by
+ *       the H_ALLOCATE_VAS_WINDOW hcall
+ * - R6: "target" is per "ibm,ppc-interrupt-server#s" or
+ *       "ibm,ppc-interrupt-gserver#s"
+ * - R7: "priority" is a valid priority not in
+ *       "ibm,plat-res-int-priorities"
+ * - R8: "eisn" is the guest EISN associated with the "lisn"
+ *
+ * Output:
+ * - None
+ */
+
+#define SPAPR_XIVE_SRC_SET_EISN PPC_BIT(62)
+#define SPAPR_XIVE_SRC_MASK     PPC_BIT(63)
+
+static target_ulong h_int_set_source_config(PowerPCCPU *cpu,
+                                            sPAPRMachineState *spapr,
+                                            target_ulong opcode,
+                                            target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    XiveEAS eas, new_eas;
+    target_ulong flags    = args[0];
+    target_ulong lisn     = args[1];
+    target_ulong target   = args[2];
+    target_ulong priority = args[3];
+    target_ulong eisn     = args[4];
+    uint8_t end_blk;
+    uint32_t end_idx;
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags & ~(SPAPR_XIVE_SRC_SET_EISN | SPAPR_XIVE_SRC_MASK)) {
+        return H_PARAMETER;
+    }
+
+    if (lisn >= xive->nr_irqs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    eas = xive->eat[lisn];
+    if (!xive_eas_is_valid(&eas)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    /* priority 0xff is used to reset the EAS */
+    if (priority == 0xff) {
+        new_eas.w = cpu_to_be64(EAS_VALID | EAS_MASKED);
+        goto out;
+    }
+
+    if (flags & SPAPR_XIVE_SRC_MASK) {
+        new_eas.w = eas.w | cpu_to_be64(EAS_MASKED);
+    } else {
+        new_eas.w = eas.w & cpu_to_be64(~EAS_MASKED);
+    }
+
+    if (spapr_xive_priority_is_reserved(priority)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: priority " TARGET_FMT_ld
+                      " is reserved\n", priority);
+        return H_P4;
+    }
+
+    /*
+     * Validate that "target" is part of the list of threads allocated
+     * to the partition. For that, find the END corresponding to the
+     * target.
+     */
+    if (spapr_xive_target_to_end(target, priority, &end_blk, &end_idx)) {
+        return H_P3;
+    }
+
+    new_eas.w = xive_set_field64(EAS_END_BLOCK, new_eas.w, end_blk);
+    new_eas.w = xive_set_field64(EAS_END_INDEX, new_eas.w, end_idx);
+
+    if (flags & SPAPR_XIVE_SRC_SET_EISN) {
+        new_eas.w = xive_set_field64(EAS_END_DATA, new_eas.w, eisn);
+    }
+
+out:
+    xive->eat[lisn] = new_eas;
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_GET_SOURCE_CONFIG hcall() is used to determine to which
+ * target/priority pair is assigned to the specified Logical Interrupt
+ * Source.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-63 Reserved
+ * - R5: "lisn" is per "interrupts", "interrupt-map", or
+ *       "ibm,xive-lisn-ranges" properties, or as returned by the
+ *       ibm,query-interrupt-source-number RTAS call, or as
+ *       returned by the H_ALLOCATE_VAS_WINDOW hcall
+ *
+ * Output:
+ * - R4: Target to which the specified Logical Interrupt Source is
+ *       assigned
+ * - R5: Priority to which the specified Logical Interrupt Source is
+ *       assigned
+ * - R6: EISN for the specified Logical Interrupt Source (this will be
+ *       equivalent to the LISN if not changed by H_INT_SET_SOURCE_CONFIG)
+ */
+static target_ulong h_int_get_source_config(PowerPCCPU *cpu,
+                                            sPAPRMachineState *spapr,
+                                            target_ulong opcode,
+                                            target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    target_ulong flags = args[0];
+    target_ulong lisn = args[1];
+    XiveEAS eas;
+    XiveEND *end;
+    uint8_t nvt_blk;
+    uint32_t end_idx, nvt_idx;
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags) {
+        return H_PARAMETER;
+    }
+
+    if (lisn >= xive->nr_irqs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    eas = xive->eat[lisn];
+    if (!xive_eas_is_valid(&eas)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    /* EAS_END_BLOCK is unused on sPAPR */
+    end_idx = xive_get_field64(EAS_END_INDEX, eas.w);
+
+    assert(end_idx < xive->nr_ends);
+    end = &xive->endt[end_idx];
+
+    nvt_blk = xive_get_field32(END_W6_NVT_BLOCK, end->w6);
+    nvt_idx = xive_get_field32(END_W6_NVT_INDEX, end->w6);
+    args[0] = spapr_xive_nvt_to_target(nvt_blk, nvt_idx);
+
+    if (xive_eas_is_masked(&eas)) {
+        args[1] = 0xff;
+    } else {
+        args[1] = xive_get_field32(END_W7_F0_PRIORITY, end->w7);
+    }
+
+    args[2] = xive_get_field64(EAS_END_DATA, eas.w);
+
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_GET_QUEUE_INFO hcall() is used to get the logical real
+ * address of the notification management page associated with the
+ * specified target and priority.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-63 Reserved
+ * - R5: "target" is per "ibm,ppc-interrupt-server#s" or
+ *       "ibm,ppc-interrupt-gserver#s"
+ * - R6: "priority" is a valid priority not in
+ *       "ibm,plat-res-int-priorities"
+ *
+ * Output:
+ * - R4: Logical real address of notification page
+ * - R5: Power of 2 page size of the notification page
+ */
+static target_ulong h_int_get_queue_info(PowerPCCPU *cpu,
+                                         sPAPRMachineState *spapr,
+                                         target_ulong opcode,
+                                         target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    XiveENDSource *end_xsrc = &xive->end_source;
+    target_ulong flags = args[0];
+    target_ulong target = args[1];
+    target_ulong priority = args[2];
+    XiveEND *end;
+    uint8_t end_blk;
+    uint32_t end_idx;
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags) {
+        return H_PARAMETER;
+    }
+
+    /*
+     * H_STATE should be returned if a H_INT_RESET is in progress.
+     * This is not needed when running the emulation under QEMU
+     */
+
+    if (spapr_xive_priority_is_reserved(priority)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: priority " TARGET_FMT_ld
+                      " is reserved\n", priority);
+        return H_P3;
+    }
+
+    /*
+     * Validate that "target" is part of the list of threads allocated
+     * to the partition. For that, find the END corresponding to the
+     * target.
+     */
+    if (spapr_xive_target_to_end(target, priority, &end_blk, &end_idx)) {
+        return H_P2;
+    }
+
+    assert(end_idx < xive->nr_ends);
+    end = &xive->endt[end_idx];
+
+    args[0] = xive->end_base + (1ull << (end_xsrc->esb_shift + 1)) * end_idx;
+    if (xive_end_is_enqueue(end)) {
+        args[1] = xive_get_field32(END_W0_QSIZE, end->w0) + 12;
+    } else {
+        args[1] = 0;
+    }
+
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_SET_QUEUE_CONFIG hcall() is used to set or reset a EQ for
+ * a given "target" and "priority".  It is also used to set the
+ * notification config associated with the EQ.  An EQ size of 0 is
+ * used to reset the EQ config for a given target and priority. If
+ * resetting the EQ config, the END associated with the given "target"
+ * and "priority" will be changed to disable queueing.
+ *
+ * Upon return from the hcall(), no additional interrupts will be
+ * directed to the old EQ (if one was set). The old EQ (if one was
+ * set) should be investigated for interrupts that occurred prior to
+ * or during the hcall().
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-62: Reserved
+ *         Bit 63: Unconditional Notify (n) per the XIVE spec
+ * - R5: "target" is per "ibm,ppc-interrupt-server#s" or
+ *       "ibm,ppc-interrupt-gserver#s"
+ * - R6: "priority" is a valid priority not in
+ *       "ibm,plat-res-int-priorities"
+ * - R7: "eventQueue": The logical real address of the start of the EQ
+ * - R8: "eventQueueSize": The power of 2 EQ size per "ibm,xive-eq-sizes"
+ *
+ * Output:
+ * - None
+ */
+
+#define SPAPR_XIVE_END_ALWAYS_NOTIFY PPC_BIT(63)
+
+static target_ulong h_int_set_queue_config(PowerPCCPU *cpu,
+                                           sPAPRMachineState *spapr,
+                                           target_ulong opcode,
+                                           target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    target_ulong flags = args[0];
+    target_ulong target = args[1];
+    target_ulong priority = args[2];
+    target_ulong qpage = args[3];
+    target_ulong qsize = args[4];
+    XiveEND end;
+    uint8_t end_blk, nvt_blk;
+    uint32_t end_idx, nvt_idx;
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags & ~SPAPR_XIVE_END_ALWAYS_NOTIFY) {
+        return H_PARAMETER;
+    }
+
+    /*
+     * H_STATE should be returned if a H_INT_RESET is in progress.
+     * This is not needed when running the emulation under QEMU
+     */
+
+    if (spapr_xive_priority_is_reserved(priority)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: priority " TARGET_FMT_ld
+                      " is reserved\n", priority);
+        return H_P3;
+    }
+
+    /*
+     * Validate that "target" is part of the list of threads allocated
+     * to the partition. For that, find the END corresponding to the
+     * target.
+     */
+
+    if (spapr_xive_target_to_end(target, priority, &end_blk, &end_idx)) {
+        return H_P2;
+    }
+
+    assert(end_idx < xive->nr_ends);
+    memcpy(&end, &xive->endt[end_idx], sizeof(XiveEND));
+
+    switch (qsize) {
+    case 12:
+    case 16:
+    case 21:
+    case 24:
+        end.w2 = cpu_to_be32((qpage >> 32) & 0x0fffffff);
+        end.w3 = cpu_to_be32(qpage & 0xffffffff);
+        end.w0 |= cpu_to_be32(END_W0_ENQUEUE);
+        end.w0 = xive_set_field32(END_W0_QSIZE, end.w0, qsize - 12);
+        break;
+    case 0:
+        /* reset queue and disable queueing */
+        spapr_xive_end_reset(&end);
+        goto out;
+
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid EQ size %"PRIx64"\n",
+                      qsize);
+        return H_P5;
+    }
+
+    if (qsize) {
+        hwaddr plen = 1 << qsize;
+        void *eq;
+
+        /*
+         * Validate the guest EQ. We should also check that the queue
+         * has been zeroed by the OS.
+         */
+        eq = address_space_map(CPU(cpu)->as, qpage, &plen, true,
+                               MEMTXATTRS_UNSPECIFIED);
+        if (plen != 1 << qsize) {
+            qemu_log_mask(LOG_GUEST_ERROR, "XIVE: failed to map EQ @0x%"
+                          HWADDR_PRIx "\n", qpage);
+            return H_P4;
+        }
+        address_space_unmap(CPU(cpu)->as, eq, plen, true, plen);
+    }
+
+    /* "target" should have been validated above */
+    if (spapr_xive_target_to_nvt(target, &nvt_blk, &nvt_idx)) {
+        g_assert_not_reached();
+    }
+
+    /*
+     * Ensure the priority and target are correctly set (they will not
+     * be right after allocation)
+     */
+    end.w6 = xive_set_field32(END_W6_NVT_BLOCK, 0ul, nvt_blk) |
+        xive_set_field32(END_W6_NVT_INDEX, 0ul, nvt_idx);
+    end.w7 = xive_set_field32(END_W7_F0_PRIORITY, 0ul, priority);
+
+    if (flags & SPAPR_XIVE_END_ALWAYS_NOTIFY) {
+        end.w0 |= cpu_to_be32(END_W0_UCOND_NOTIFY);
+    } else {
+        end.w0 &= cpu_to_be32((uint32_t)~END_W0_UCOND_NOTIFY);
+    }
+
+    /*
+     * The generation bit for the END starts at 1 and The END page
+     * offset counter starts at 0.
+     */
+    end.w1 = cpu_to_be32(END_W1_GENERATION) |
+        xive_set_field32(END_W1_PAGE_OFF, 0ul, 0ul);
+    end.w0 |= cpu_to_be32(END_W0_VALID);
+
+    /*
+     * TODO: issue syncs required to ensure all in-flight interrupts
+     * are complete on the old END
+     */
+
+out:
+    /* Update END */
+    memcpy(&xive->endt[end_idx], &end, sizeof(XiveEND));
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_GET_QUEUE_CONFIG hcall() is used to get a EQ for a given
+ * target and priority.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-62: Reserved
+ *         Bit 63: Debug: Return debug data
+ * - R5: "target" is per "ibm,ppc-interrupt-server#s" or
+ *       "ibm,ppc-interrupt-gserver#s"
+ * - R6: "priority" is a valid priority not in
+ *       "ibm,plat-res-int-priorities"
+ *
+ * Output:
+ * - R4: "flags":
+ *       Bits 0-61: Reserved
+ *       Bit 62: The value of Event Queue Generation Number (g) per
+ *              the XIVE spec if "Debug" = 1
+ *       Bit 63: The value of Unconditional Notify (n) per the XIVE spec
+ * - R5: The logical real address of the start of the EQ
+ * - R6: The power of 2 EQ size per "ibm,xive-eq-sizes"
+ * - R7: The value of Event Queue Offset Counter per XIVE spec
+ *       if "Debug" = 1, else 0
+ *
+ */
+
+#define SPAPR_XIVE_END_DEBUG     PPC_BIT(63)
+
+static target_ulong h_int_get_queue_config(PowerPCCPU *cpu,
+                                           sPAPRMachineState *spapr,
+                                           target_ulong opcode,
+                                           target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    target_ulong flags = args[0];
+    target_ulong target = args[1];
+    target_ulong priority = args[2];
+    XiveEND *end;
+    uint8_t end_blk;
+    uint32_t end_idx;
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags & ~SPAPR_XIVE_END_DEBUG) {
+        return H_PARAMETER;
+    }
+
+    /*
+     * H_STATE should be returned if a H_INT_RESET is in progress.
+     * This is not needed when running the emulation under QEMU
+     */
+
+    if (spapr_xive_priority_is_reserved(priority)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: priority " TARGET_FMT_ld
+                      " is reserved\n", priority);
+        return H_P3;
+    }
+
+    /*
+     * Validate that "target" is part of the list of threads allocated
+     * to the partition. For that, find the END corresponding to the
+     * target.
+     */
+    if (spapr_xive_target_to_end(target, priority, &end_blk, &end_idx)) {
+        return H_P2;
+    }
+
+    assert(end_idx < xive->nr_ends);
+    end = &xive->endt[end_idx];
+
+    args[0] = 0;
+    if (xive_end_is_notify(end)) {
+        args[0] |= SPAPR_XIVE_END_ALWAYS_NOTIFY;
+    }
+
+    if (xive_end_is_enqueue(end)) {
+        args[1] = (uint64_t) be32_to_cpu(end->w2 & 0x0fffffff) << 32
+            | be32_to_cpu(end->w3);
+        args[2] = xive_get_field32(END_W0_QSIZE, end->w0) + 12;
+    } else {
+        args[1] = 0;
+        args[2] = 0;
+    }
+
+    /* TODO: do we need any locking on the END ? */
+    if (flags & SPAPR_XIVE_END_DEBUG) {
+        /* Load the event queue generation number into the return flags */
+        args[0] |= (uint64_t)xive_get_field32(END_W1_GENERATION, end->w1) << 62;
+
+        /* Load R7 with the event queue offset counter */
+        args[3] = xive_get_field32(END_W1_PAGE_OFF, end->w1);
+    } else {
+        args[3] = 0;
+    }
+
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_SET_OS_REPORTING_LINE hcall() is used to set the
+ * reporting cache line pair for the calling thread.  The reporting
+ * cache lines will contain the OS interrupt context when the OS
+ * issues a CI store byte to @TIMA+0xC10 to acknowledge the OS
+ * interrupt. The reporting cache lines can be reset by inputting -1
+ * in "reportingLine".  Issuing the CI store byte without reporting
+ * cache lines registered will result in the data not being accessible
+ * to the OS.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-63: Reserved
+ * - R5: "reportingLine": The logical real address of the reporting cache
+ *       line pair
+ *
+ * Output:
+ * - None
+ */
+static target_ulong h_int_set_os_reporting_line(PowerPCCPU *cpu,
+                                                sPAPRMachineState *spapr,
+                                                target_ulong opcode,
+                                                target_ulong *args)
+{
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    /*
+     * H_STATE should be returned if a H_INT_RESET is in progress.
+     * This is not needed when running the emulation under QEMU
+     */
+
+    /* TODO: H_INT_SET_OS_REPORTING_LINE */
+    return H_FUNCTION;
+}
+
+/*
+ * The H_INT_GET_OS_REPORTING_LINE hcall() is used to get the logical
+ * real address of the reporting cache line pair set for the input
+ * "target".  If no reporting cache line pair has been set, -1 is
+ * returned.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-63: Reserved
+ * - R5: "target" is per "ibm,ppc-interrupt-server#s" or
+ *       "ibm,ppc-interrupt-gserver#s"
+ * - R6: "reportingLine": The logical real address of the reporting
+ *        cache line pair
+ *
+ * Output:
+ * - R4: The logical real address of the reporting line if set, else -1
+ */
+static target_ulong h_int_get_os_reporting_line(PowerPCCPU *cpu,
+                                                sPAPRMachineState *spapr,
+                                                target_ulong opcode,
+                                                target_ulong *args)
+{
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    /*
+     * H_STATE should be returned if a H_INT_RESET is in progress.
+     * This is not needed when running the emulation under QEMU
+     */
+
+    /* TODO: H_INT_GET_OS_REPORTING_LINE */
+    return H_FUNCTION;
+}
+
+/*
+ * The H_INT_ESB hcall() is used to issue a load or store to the ESB
+ * page for the input "lisn".  This hcall is only supported for LISNs
+ * that have the ESB hcall flag set to 1 when returned from hcall()
+ * H_INT_GET_SOURCE_INFO.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-62: Reserved
+ *         bit 63: Store: Store=1, store operation, else load operation
+ * - R5: "lisn" is per "interrupts", "interrupt-map", or
+ *       "ibm,xive-lisn-ranges" properties, or as returned by the
+ *       ibm,query-interrupt-source-number RTAS call, or as
+ *       returned by the H_ALLOCATE_VAS_WINDOW hcall
+ * - R6: "esbOffset" is the offset into the ESB page for the load or
+ *       store operation
+ * - R7: "storeData" is the data to write for a store operation
+ *
+ * Output:
+ * - R4: The value of the load if load operation, else -1
+ */
+
+#define SPAPR_XIVE_ESB_STORE PPC_BIT(63)
+
+static target_ulong h_int_esb(PowerPCCPU *cpu,
+                              sPAPRMachineState *spapr,
+                              target_ulong opcode,
+                              target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    XiveEAS eas;
+    target_ulong flags  = args[0];
+    target_ulong lisn   = args[1];
+    target_ulong offset = args[2];
+    target_ulong data   = args[3];
+    hwaddr mmio_addr;
+    XiveSource *xsrc = &xive->source;
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags & ~SPAPR_XIVE_ESB_STORE) {
+        return H_PARAMETER;
+    }
+
+    if (lisn >= xive->nr_irqs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    eas = xive->eat[lisn];
+    if (!xive_eas_is_valid(&eas)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    if (offset > (1ull << xsrc->esb_shift)) {
+        return H_P3;
+    }
+
+    mmio_addr = xive->vc_base + xive_source_esb_mgmt(xsrc, lisn) + offset;
+
+    if (dma_memory_rw(&address_space_memory, mmio_addr, &data, 8,
+                      (flags & SPAPR_XIVE_ESB_STORE))) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: failed to access ESB @0x%"
+                      HWADDR_PRIx "\n", mmio_addr);
+        return H_HARDWARE;
+    }
+    args[0] = (flags & SPAPR_XIVE_ESB_STORE) ? -1 : data;
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_SYNC hcall() is used to issue hardware syncs that will
+ * ensure any in flight events for the input lisn are in the event
+ * queue.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-63: Reserved
+ * - R5: "lisn" is per "interrupts", "interrupt-map", or
+ *       "ibm,xive-lisn-ranges" properties, or as returned by the
+ *       ibm,query-interrupt-source-number RTAS call, or as
+ *       returned by the H_ALLOCATE_VAS_WINDOW hcall
+ *
+ * Output:
+ * - None
+ */
+static target_ulong h_int_sync(PowerPCCPU *cpu,
+                               sPAPRMachineState *spapr,
+                               target_ulong opcode,
+                               target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    XiveEAS eas;
+    target_ulong flags = args[0];
+    target_ulong lisn = args[1];
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags) {
+        return H_PARAMETER;
+    }
+
+    if (lisn >= xive->nr_irqs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    eas = xive->eat[lisn];
+    if (!xive_eas_is_valid(&eas)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Invalid LISN " TARGET_FMT_lx "\n",
+                      lisn);
+        return H_P2;
+    }
+
+    /*
+     * H_STATE should be returned if a H_INT_RESET is in progress.
+     * This is not needed when running the emulation under QEMU
+     */
+
+    /* This is not real hardware. Nothing to be done */
+    return H_SUCCESS;
+}
+
+/*
+ * The H_INT_RESET hcall() is used to reset all of the partition's
+ * interrupt exploitation structures to their initial state.  This
+ * means losing all previously set interrupt state set via
+ * H_INT_SET_SOURCE_CONFIG and H_INT_SET_QUEUE_CONFIG.
+ *
+ * Parameters:
+ * Input:
+ * - R4: "flags"
+ *         Bits 0-63: Reserved
+ *
+ * Output:
+ * - None
+ */
+static target_ulong h_int_reset(PowerPCCPU *cpu,
+                                sPAPRMachineState *spapr,
+                                target_ulong opcode,
+                                target_ulong *args)
+{
+    sPAPRXive *xive = spapr->xive;
+    target_ulong flags   = args[0];
+
+    if (!spapr_ovec_test(spapr->ov5_cas, OV5_XIVE_EXPLOIT)) {
+        return H_FUNCTION;
+    }
+
+    if (flags) {
+        return H_PARAMETER;
+    }
+
+    device_reset(DEVICE(xive));
+    return H_SUCCESS;
+}
+
+void spapr_xive_hcall_init(sPAPRMachineState *spapr)
+{
+    spapr_register_hypercall(H_INT_GET_SOURCE_INFO, h_int_get_source_info);
+    spapr_register_hypercall(H_INT_SET_SOURCE_CONFIG, h_int_set_source_config);
+    spapr_register_hypercall(H_INT_GET_SOURCE_CONFIG, h_int_get_source_config);
+    spapr_register_hypercall(H_INT_GET_QUEUE_INFO, h_int_get_queue_info);
+    spapr_register_hypercall(H_INT_SET_QUEUE_CONFIG, h_int_set_queue_config);
+    spapr_register_hypercall(H_INT_GET_QUEUE_CONFIG, h_int_get_queue_config);
+    spapr_register_hypercall(H_INT_SET_OS_REPORTING_LINE,
+                             h_int_set_os_reporting_line);
+    spapr_register_hypercall(H_INT_GET_OS_REPORTING_LINE,
+                             h_int_get_os_reporting_line);
+    spapr_register_hypercall(H_INT_ESB, h_int_esb);
+    spapr_register_hypercall(H_INT_SYNC, h_int_sync);
+    spapr_register_hypercall(H_INT_RESET, h_int_reset);
+}