OSCL-LXR linux-6.0.1/​arch/​powerpc/​kvm/​book3s_xics.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2012 Michael Ellerman, IBM Corporation.
  * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation.
  */
 
 #include <linux/kernel.h>
 #include <linux/kvm_host.h>
 #include <linux/err.h>
 #include <linux/gfp.h>
 #include <linux/anon_inodes.h>
 #include <linux/spinlock.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 
 #include <asm/kvm_book3s.h>
 #include <asm/kvm_ppc.h>
 #include <asm/hvcall.h>
 #include <asm/xics.h>
 #include <asm/time.h>
 
 #include <linux/seq_file.h>
 
 #include "book3s_xics.h"
 
 #if 1
 #define XICS_DBG(fmt...) do { } while (0)
 #else
 #define XICS_DBG(fmt...) trace_printk(fmt)
 #endif
 
 #define ENABLE_REALMODE true
 #define DEBUG_REALMODE  false
 
 /*
  * LOCKING
  * =======
  *
  * Each ICS has a spin lock protecting the information about the IRQ
  * sources and avoiding simultaneous deliveries of the same interrupt.
  *
  * ICP operations are done via a single compare & swap transaction
  * (most ICP state fits in the union kvmppc_icp_state)
  */
 
 /*
  * TODO
  * ====
  *
  * - To speed up resends, keep a bitmap of "resend" set bits in the
  *   ICS
  *
  * - Speed up server# -> ICP lookup (array ? hash table ?)
  *
  * - Make ICS lockless as well, or at least a per-interrupt lock or hashed
  *   locks array to improve scalability
  */
 
 /* -- ICS routines -- */
 
 static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
                 u32 new_irq, bool check_resend);
 
 /*
  * Return value ideally indicates how the interrupt was handled, but no
  * callers look at it (given that we don't implement KVM_IRQ_LINE_STATUS),
  * so just return 0.
  */
 static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
 {
     struct ics_irq_state *state;
     struct kvmppc_ics *ics;
     u16 src;
     u32 pq_old, pq_new;
 
     XICS_DBG("ics deliver %#x (level: %d)\n", irq, level);
 
     ics = kvmppc_xics_find_ics(xics, irq, &src);
     if (!ics) {
         XICS_DBG("ics_deliver_irq: IRQ 0x%06x not found !\n", irq);
         return -EINVAL;
     }
     state = &ics->irq_state[src];
     if (!state->exists)
         return -EINVAL;
 
     if (level == KVM_INTERRUPT_SET_LEVEL || level == KVM_INTERRUPT_SET)
         level = 1;
     else if (level == KVM_INTERRUPT_UNSET)
         level = 0;
     /*
      * Take other values the same as 1, consistent with original code.
      * maybe WARN here?
      */
 
     if (!state->lsi && level == 0) /* noop for MSI */
         return 0;
 
     do {
         pq_old = state->pq_state;
         if (state->lsi) {
             if (level) {
                 if (pq_old & PQ_PRESENTED)
                     /* Setting already set LSI ... */
                     return 0;
 
                 pq_new = PQ_PRESENTED;
             } else
                 pq_new = 0;
         } else
             pq_new = ((pq_old << 1) & 3) | PQ_PRESENTED;
     } while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
 
     /* Test P=1, Q=0, this is the only case where we present */
     if (pq_new == PQ_PRESENTED)
         icp_deliver_irq(xics, NULL, irq, false);
 
     /* Record which CPU this arrived on for passed-through interrupts */
     if (state->host_irq)
         state->intr_cpu = raw_smp_processor_id();
 
     return 0;
 }
 
 static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
                  struct kvmppc_icp *icp)
 {
     int i;
 
     for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
         struct ics_irq_state *state = &ics->irq_state[i];
         if (state->resend) {
             XICS_DBG("resend %#x prio %#x\n", state->number,
                       state->priority);
             icp_deliver_irq(xics, icp, state->number, true);
         }
     }
 }
 
 static bool write_xive(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
                struct ics_irq_state *state,
                u32 server, u32 priority, u32 saved_priority)
 {
     bool deliver;
     unsigned long flags;
 
     local_irq_save(flags);
     arch_spin_lock(&ics->lock);
 
     state->server = server;
     state->priority = priority;
     state->saved_priority = saved_priority;
     deliver = false;
     if ((state->masked_pending || state->resend) && priority != MASKED) {
         state->masked_pending = 0;
         state->resend = 0;
         deliver = true;
     }
 
     arch_spin_unlock(&ics->lock);
     local_irq_restore(flags);
 
     return deliver;
 }
 
 int kvmppc_xics_set_xive(struct kvm *kvm, u32 irq, u32 server, u32 priority)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
     struct kvmppc_icp *icp;
     struct kvmppc_ics *ics;
     struct ics_irq_state *state;
     u16 src;
 
     if (!xics)
         return -ENODEV;
 
     ics = kvmppc_xics_find_ics(xics, irq, &src);
     if (!ics)
         return -EINVAL;
     state = &ics->irq_state[src];
 
     icp = kvmppc_xics_find_server(kvm, server);
     if (!icp)
         return -EINVAL;
 
     XICS_DBG("set_xive %#x server %#x prio %#x MP:%d RS:%d\n",
          irq, server, priority,
          state->masked_pending, state->resend);
 
     if (write_xive(xics, ics, state, server, priority, priority))
         icp_deliver_irq(xics, icp, irq, false);
 
     return 0;
 }
 
 int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, u32 *priority)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
     struct kvmppc_ics *ics;
     struct ics_irq_state *state;
     u16 src;
     unsigned long flags;
 
     if (!xics)
         return -ENODEV;
 
     ics = kvmppc_xics_find_ics(xics, irq, &src);
     if (!ics)
         return -EINVAL;
     state = &ics->irq_state[src];
 
     local_irq_save(flags);
     arch_spin_lock(&ics->lock);
     *server = state->server;
     *priority = state->priority;
     arch_spin_unlock(&ics->lock);
     local_irq_restore(flags);
 
     return 0;
 }
 
 int kvmppc_xics_int_on(struct kvm *kvm, u32 irq)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
     struct kvmppc_icp *icp;
     struct kvmppc_ics *ics;
     struct ics_irq_state *state;
     u16 src;
 
     if (!xics)
         return -ENODEV;
 
     ics = kvmppc_xics_find_ics(xics, irq, &src);
     if (!ics)
         return -EINVAL;
     state = &ics->irq_state[src];
 
     icp = kvmppc_xics_find_server(kvm, state->server);
     if (!icp)
         return -EINVAL;
 
     if (write_xive(xics, ics, state, state->server, state->saved_priority,
                state->saved_priority))
         icp_deliver_irq(xics, icp, irq, false);
 
     return 0;
 }
 
 int kvmppc_xics_int_off(struct kvm *kvm, u32 irq)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
     struct kvmppc_ics *ics;
     struct ics_irq_state *state;
     u16 src;
 
     if (!xics)
         return -ENODEV;
 
     ics = kvmppc_xics_find_ics(xics, irq, &src);
     if (!ics)
         return -EINVAL;
     state = &ics->irq_state[src];
 
     write_xive(xics, ics, state, state->server, MASKED, state->priority);
 
     return 0;
 }
 
 /* -- ICP routines, including hcalls -- */
 
 static inline bool icp_try_update(struct kvmppc_icp *icp,
                   union kvmppc_icp_state old,
                   union kvmppc_icp_state new,
                   bool change_self)
 {
     bool success;
 
     /* Calculate new output value */
     new.out_ee = (new.xisr && (new.pending_pri < new.cppr));
 
     /* Attempt atomic update */
     success = cmpxchg64(&icp->state.raw, old.raw, new.raw) == old.raw;
     if (!success)
         goto bail;
 
     XICS_DBG("UPD [%04lx] - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
          icp->server_num,
          old.cppr, old.mfrr, old.pending_pri, old.xisr,
          old.need_resend, old.out_ee);
     XICS_DBG("UPD        - C:%02x M:%02x PP: %02x PI:%06x R:%d O:%d\n",
          new.cppr, new.mfrr, new.pending_pri, new.xisr,
          new.need_resend, new.out_ee);
     /*
      * Check for output state update
      *
      * Note that this is racy since another processor could be updating
      * the state already. This is why we never clear the interrupt output
      * here, we only ever set it. The clear only happens prior to doing
      * an update and only by the processor itself. Currently we do it
      * in Accept (H_XIRR) and Up_Cppr (H_XPPR).
      *
      * We also do not try to figure out whether the EE state has changed,
      * we unconditionally set it if the new state calls for it. The reason
      * for that is that we opportunistically remove the pending interrupt
      * flag when raising CPPR, so we need to set it back here if an
      * interrupt is still pending.
      */
     if (new.out_ee) {
         kvmppc_book3s_queue_irqprio(icp->vcpu,
                         BOOK3S_INTERRUPT_EXTERNAL);
         if (!change_self)
             kvmppc_fast_vcpu_kick(icp->vcpu);
     }
  bail:
     return success;
 }
 
 static void icp_check_resend(struct kvmppc_xics *xics,
                  struct kvmppc_icp *icp)
 {
     u32 icsid;
 
     /* Order this load with the test for need_resend in the caller */
     smp_rmb();
     for_each_set_bit(icsid, icp->resend_map, xics->max_icsid + 1) {
         struct kvmppc_ics *ics = xics->ics[icsid];
 
         if (!test_and_clear_bit(icsid, icp->resend_map))
             continue;
         if (!ics)
             continue;
         ics_check_resend(xics, ics, icp);
     }
 }
 
 static bool icp_try_to_deliver(struct kvmppc_icp *icp, u32 irq, u8 priority,
                    u32 *reject)
 {
     union kvmppc_icp_state old_state, new_state;
     bool success;
 
     XICS_DBG("try deliver %#x(P:%#x) to server %#lx\n", irq, priority,
          icp->server_num);
 
     do {
         old_state = new_state = READ_ONCE(icp->state);
 
         *reject = 0;
 
         /* See if we can deliver */
         success = new_state.cppr > priority &&
             new_state.mfrr > priority &&
             new_state.pending_pri > priority;
 
         /*
          * If we can, check for a rejection and perform the
          * delivery
          */
         if (success) {
             *reject = new_state.xisr;
             new_state.xisr = irq;
             new_state.pending_pri = priority;
         } else {
             /*
              * If we failed to deliver we set need_resend
              * so a subsequent CPPR state change causes us
              * to try a new delivery.
              */
             new_state.need_resend = true;
         }
 
     } while (!icp_try_update(icp, old_state, new_state, false));
 
     return success;
 }
 
 static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
                 u32 new_irq, bool check_resend)
 {
     struct ics_irq_state *state;
     struct kvmppc_ics *ics;
     u32 reject;
     u16 src;
     unsigned long flags;
 
     /*
      * This is used both for initial delivery of an interrupt and
      * for subsequent rejection.
      *
      * Rejection can be racy vs. resends. We have evaluated the
      * rejection in an atomic ICP transaction which is now complete,
      * so potentially the ICP can already accept the interrupt again.
      *
      * So we need to retry the delivery. Essentially the reject path
      * boils down to a failed delivery. Always.
      *
      * Now the interrupt could also have moved to a different target,
      * thus we may need to re-do the ICP lookup as well
      */
 
  again:
     /* Get the ICS state and lock it */
     ics = kvmppc_xics_find_ics(xics, new_irq, &src);
     if (!ics) {
         XICS_DBG("icp_deliver_irq: IRQ 0x%06x not found !\n", new_irq);
         return;
     }
     state = &ics->irq_state[src];
 
     /* Get a lock on the ICS */
     local_irq_save(flags);
     arch_spin_lock(&ics->lock);
 
     /* Get our server */
     if (!icp || state->server != icp->server_num) {
         icp = kvmppc_xics_find_server(xics->kvm, state->server);
         if (!icp) {
             pr_warn("icp_deliver_irq: IRQ 0x%06x server 0x%x not found !\n",
                 new_irq, state->server);
             goto out;
         }
     }
 
     if (check_resend)
         if (!state->resend)
             goto out;
 
     /* Clear the resend bit of that interrupt */
     state->resend = 0;
 
     /*
      * If masked, bail out
      *
      * Note: PAPR doesn't mention anything about masked pending
      * when doing a resend, only when doing a delivery.
      *
      * However that would have the effect of losing a masked
      * interrupt that was rejected and isn't consistent with
      * the whole masked_pending business which is about not
      * losing interrupts that occur while masked.
      *
      * I don't differentiate normal deliveries and resends, this
      * implementation will differ from PAPR and not lose such
      * interrupts.
      */
     if (state->priority == MASKED) {
         XICS_DBG("irq %#x masked pending\n", new_irq);
         state->masked_pending = 1;
         goto out;
     }
 
     /*
      * Try the delivery, this will set the need_resend flag
      * in the ICP as part of the atomic transaction if the
      * delivery is not possible.
      *
      * Note that if successful, the new delivery might have itself
      * rejected an interrupt that was "delivered" before we took the
      * ics spin lock.
      *
      * In this case we do the whole sequence all over again for the
      * new guy. We cannot assume that the rejected interrupt is less
      * favored than the new one, and thus doesn't need to be delivered,
      * because by the time we exit icp_try_to_deliver() the target
      * processor may well have already consumed & completed it, and thus
      * the rejected interrupt might actually be already acceptable.
      */
     if (icp_try_to_deliver(icp, new_irq, state->priority, &reject)) {
         /*
          * Delivery was successful, did we reject somebody else ?
          */
         if (reject && reject != XICS_IPI) {
             arch_spin_unlock(&ics->lock);
             local_irq_restore(flags);
             new_irq = reject;
             check_resend = false;
             goto again;
         }
     } else {
         /*
          * We failed to deliver the interrupt we need to set the
          * resend map bit and mark the ICS state as needing a resend
          */
         state->resend = 1;
 
         /*
          * Make sure when checking resend, we don't miss the resend
          * if resend_map bit is seen and cleared.
          */
         smp_wmb();
         set_bit(ics->icsid, icp->resend_map);
 
         /*
          * If the need_resend flag got cleared in the ICP some time
          * between icp_try_to_deliver() atomic update and now, then
          * we know it might have missed the resend_map bit. So we
          * retry
          */
         smp_mb();
         if (!icp->state.need_resend) {
             state->resend = 0;
             arch_spin_unlock(&ics->lock);
             local_irq_restore(flags);
             check_resend = false;
             goto again;
         }
     }
  out:
     arch_spin_unlock(&ics->lock);
     local_irq_restore(flags);
 }
 
 static void icp_down_cppr(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
               u8 new_cppr)
 {
     union kvmppc_icp_state old_state, new_state;
     bool resend;
 
     /*
      * This handles several related states in one operation:
      *
      * ICP State: Down_CPPR
      *
      * Load CPPR with new value and if the XISR is 0
      * then check for resends:
      *
      * ICP State: Resend
      *
      * If MFRR is more favored than CPPR, check for IPIs
      * and notify ICS of a potential resend. This is done
      * asynchronously (when used in real mode, we will have
      * to exit here).
      *
      * We do not handle the complete Check_IPI as documented
      * here. In the PAPR, this state will be used for both
      * Set_MFRR and Down_CPPR. However, we know that we aren't
      * changing the MFRR state here so we don't need to handle
      * the case of an MFRR causing a reject of a pending irq,
      * this will have been handled when the MFRR was set in the
      * first place.
      *
      * Thus we don't have to handle rejects, only resends.
      *
      * When implementing real mode for HV KVM, resend will lead to
      * a H_TOO_HARD return and the whole transaction will be handled
      * in virtual mode.
      */
     do {
         old_state = new_state = READ_ONCE(icp->state);
 
         /* Down_CPPR */
         new_state.cppr = new_cppr;
 
         /*
          * Cut down Resend / Check_IPI / IPI
          *
          * The logic is that we cannot have a pending interrupt
          * trumped by an IPI at this point (see above), so we
          * know that either the pending interrupt is already an
          * IPI (in which case we don't care to override it) or
          * it's either more favored than us or non existent
          */
         if (new_state.mfrr < new_cppr &&
             new_state.mfrr <= new_state.pending_pri) {
             WARN_ON(new_state.xisr != XICS_IPI &&
                 new_state.xisr != 0);
             new_state.pending_pri = new_state.mfrr;
             new_state.xisr = XICS_IPI;
         }
 
         /* Latch/clear resend bit */
         resend = new_state.need_resend;
         new_state.need_resend = 0;
 
     } while (!icp_try_update(icp, old_state, new_state, true));
 
     /*
      * Now handle resend checks. Those are asynchronous to the ICP
      * state update in HW (ie bus transactions) so we can handle them
      * separately here too
      */
     if (resend)
         icp_check_resend(xics, icp);
 }
 
 static noinline unsigned long kvmppc_h_xirr(struct kvm_vcpu *vcpu)
 {
     union kvmppc_icp_state old_state, new_state;
     struct kvmppc_icp *icp = vcpu->arch.icp;
     u32 xirr;
 
     /* First, remove EE from the processor */
     kvmppc_book3s_dequeue_irqprio(icp->vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 
     /*
      * ICP State: Accept_Interrupt
      *
      * Return the pending interrupt (if any) along with the
      * current CPPR, then clear the XISR & set CPPR to the
      * pending priority
      */
     do {
         old_state = new_state = READ_ONCE(icp->state);
 
         xirr = old_state.xisr | (((u32)old_state.cppr) << 24);
         if (!old_state.xisr)
             break;
         new_state.cppr = new_state.pending_pri;
         new_state.pending_pri = 0xff;
         new_state.xisr = 0;
 
     } while (!icp_try_update(icp, old_state, new_state, true));
 
     XICS_DBG("h_xirr vcpu %d xirr %#x\n", vcpu->vcpu_id, xirr);
 
     return xirr;
 }
 
 static noinline int kvmppc_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,
                  unsigned long mfrr)
 {
     union kvmppc_icp_state old_state, new_state;
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     struct kvmppc_icp *icp;
     u32 reject;
     bool resend;
     bool local;
 
     XICS_DBG("h_ipi vcpu %d to server %lu mfrr %#lx\n",
          vcpu->vcpu_id, server, mfrr);
 
     icp = vcpu->arch.icp;
     local = icp->server_num == server;
     if (!local) {
         icp = kvmppc_xics_find_server(vcpu->kvm, server);
         if (!icp)
             return H_PARAMETER;
     }
 
     /*
      * ICP state: Set_MFRR
      *
      * If the CPPR is more favored than the new MFRR, then
      * nothing needs to be rejected as there can be no XISR to
      * reject.  If the MFRR is being made less favored then
      * there might be a previously-rejected interrupt needing
      * to be resent.
      *
      * ICP state: Check_IPI
      *
      * If the CPPR is less favored, then we might be replacing
      * an interrupt, and thus need to possibly reject it.
      *
      * ICP State: IPI
      *
      * Besides rejecting any pending interrupts, we also
      * update XISR and pending_pri to mark IPI as pending.
      *
      * PAPR does not describe this state, but if the MFRR is being
      * made less favored than its earlier value, there might be
      * a previously-rejected interrupt needing to be resent.
      * Ideally, we would want to resend only if
      *  prio(pending_interrupt) < mfrr &&
      *  prio(pending_interrupt) < cppr
      * where pending interrupt is the one that was rejected. But
      * we don't have that state, so we simply trigger a resend
      * whenever the MFRR is made less favored.
      */
     do {
         old_state = new_state = READ_ONCE(icp->state);
 
         /* Set_MFRR */
         new_state.mfrr = mfrr;
 
         /* Check_IPI */
         reject = 0;
         resend = false;
         if (mfrr < new_state.cppr) {
             /* Reject a pending interrupt if not an IPI */
             if (mfrr <= new_state.pending_pri) {
                 reject = new_state.xisr;
                 new_state.pending_pri = mfrr;
                 new_state.xisr = XICS_IPI;
             }
         }
 
         if (mfrr > old_state.mfrr) {
             resend = new_state.need_resend;
             new_state.need_resend = 0;
         }
     } while (!icp_try_update(icp, old_state, new_state, local));
 
     /* Handle reject */
     if (reject && reject != XICS_IPI)
         icp_deliver_irq(xics, icp, reject, false);
 
     /* Handle resend */
     if (resend)
         icp_check_resend(xics, icp);
 
     return H_SUCCESS;
 }
 
 static int kvmppc_h_ipoll(struct kvm_vcpu *vcpu, unsigned long server)
 {
     union kvmppc_icp_state state;
     struct kvmppc_icp *icp;
 
     icp = vcpu->arch.icp;
     if (icp->server_num != server) {
         icp = kvmppc_xics_find_server(vcpu->kvm, server);
         if (!icp)
             return H_PARAMETER;
     }
     state = READ_ONCE(icp->state);
     kvmppc_set_gpr(vcpu, 4, ((u32)state.cppr << 24) | state.xisr);
     kvmppc_set_gpr(vcpu, 5, state.mfrr);
     return H_SUCCESS;
 }
 
 static noinline void kvmppc_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr)
 {
     union kvmppc_icp_state old_state, new_state;
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     struct kvmppc_icp *icp = vcpu->arch.icp;
     u32 reject;
 
     XICS_DBG("h_cppr vcpu %d cppr %#lx\n", vcpu->vcpu_id, cppr);
 
     /*
      * ICP State: Set_CPPR
      *
      * We can safely compare the new value with the current
      * value outside of the transaction as the CPPR is only
      * ever changed by the processor on itself
      */
     if (cppr > icp->state.cppr)
         icp_down_cppr(xics, icp, cppr);
     else if (cppr == icp->state.cppr)
         return;
 
     /*
      * ICP State: Up_CPPR
      *
      * The processor is raising its priority, this can result
      * in a rejection of a pending interrupt:
      *
      * ICP State: Reject_Current
      *
      * We can remove EE from the current processor, the update
      * transaction will set it again if needed
      */
     kvmppc_book3s_dequeue_irqprio(icp->vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 
     do {
         old_state = new_state = READ_ONCE(icp->state);
 
         reject = 0;
         new_state.cppr = cppr;
 
         if (cppr <= new_state.pending_pri) {
             reject = new_state.xisr;
             new_state.xisr = 0;
             new_state.pending_pri = 0xff;
         }
 
     } while (!icp_try_update(icp, old_state, new_state, true));
 
     /*
      * Check for rejects. They are handled by doing a new delivery
      * attempt (see comments in icp_deliver_irq).
      */
     if (reject && reject != XICS_IPI)
         icp_deliver_irq(xics, icp, reject, false);
 }
 
 static int ics_eoi(struct kvm_vcpu *vcpu, u32 irq)
 {
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     struct kvmppc_icp *icp = vcpu->arch.icp;
     struct kvmppc_ics *ics;
     struct ics_irq_state *state;
     u16 src;
     u32 pq_old, pq_new;
 
     /*
      * ICS EOI handling: For LSI, if P bit is still set, we need to
      * resend it.
      *
      * For MSI, we move Q bit into P (and clear Q). If it is set,
      * resend it.
      */
 
     ics = kvmppc_xics_find_ics(xics, irq, &src);
     if (!ics) {
         XICS_DBG("ios_eoi: IRQ 0x%06x not found !\n", irq);
         return H_PARAMETER;
     }
     state = &ics->irq_state[src];
 
     if (state->lsi)
         pq_new = state->pq_state;
     else
         do {
             pq_old = state->pq_state;
             pq_new = pq_old >> 1;
         } while (cmpxchg(&state->pq_state, pq_old, pq_new) != pq_old);
 
     if (pq_new & PQ_PRESENTED)
         icp_deliver_irq(xics, icp, irq, false);
 
     kvm_notify_acked_irq(vcpu->kvm, 0, irq);
 
     return H_SUCCESS;
 }
 
 static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
 {
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     struct kvmppc_icp *icp = vcpu->arch.icp;
     u32 irq = xirr & 0x00ffffff;
 
     XICS_DBG("h_eoi vcpu %d eoi %#lx\n", vcpu->vcpu_id, xirr);
 
     /*
      * ICP State: EOI
      *
      * Note: If EOI is incorrectly used by SW to lower the CPPR
      * value (ie more favored), we do not check for rejection of
      * a pending interrupt, this is a SW error and PAPR specifies
      * that we don't have to deal with it.
      *
      * The sending of an EOI to the ICS is handled after the
      * CPPR update
      *
      * ICP State: Down_CPPR which we handle
      * in a separate function as it's shared with H_CPPR.
      */
     icp_down_cppr(xics, icp, xirr >> 24);
 
     /* IPIs have no EOI */
     if (irq == XICS_IPI)
         return H_SUCCESS;
 
     return ics_eoi(vcpu, irq);
 }
 
 int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
 {
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     struct kvmppc_icp *icp = vcpu->arch.icp;
 
     XICS_DBG("XICS_RM: H_%x completing, act: %x state: %lx tgt: %p\n",
          hcall, icp->rm_action, icp->rm_dbgstate.raw, icp->rm_dbgtgt);
 
     if (icp->rm_action & XICS_RM_KICK_VCPU) {
         icp->n_rm_kick_vcpu++;
         kvmppc_fast_vcpu_kick(icp->rm_kick_target);
     }
     if (icp->rm_action & XICS_RM_CHECK_RESEND) {
         icp->n_rm_check_resend++;
         icp_check_resend(xics, icp->rm_resend_icp);
     }
     if (icp->rm_action & XICS_RM_NOTIFY_EOI) {
         icp->n_rm_notify_eoi++;
         kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq);
     }
 
     icp->rm_action = 0;
 
     return H_SUCCESS;
 }
 EXPORT_SYMBOL_GPL(kvmppc_xics_rm_complete);
 
 int kvmppc_xics_hcall(struct kvm_vcpu *vcpu, u32 req)
 {
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     unsigned long res;
     int rc = H_SUCCESS;
 
     /* Check if we have an ICP */
     if (!xics || !vcpu->arch.icp)
         return H_HARDWARE;
 
     /* These requests don't have real-mode implementations at present */
     switch (req) {
     case H_XIRR_X:
         res = kvmppc_h_xirr(vcpu);
         kvmppc_set_gpr(vcpu, 4, res);
         kvmppc_set_gpr(vcpu, 5, get_tb());
         return rc;
     case H_IPOLL:
         rc = kvmppc_h_ipoll(vcpu, kvmppc_get_gpr(vcpu, 4));
         return rc;
     }
 
     /* Check for real mode returning too hard */
     if (xics->real_mode && is_kvmppc_hv_enabled(vcpu->kvm))
         return kvmppc_xics_rm_complete(vcpu, req);
 
     switch (req) {
     case H_XIRR:
         res = kvmppc_h_xirr(vcpu);
         kvmppc_set_gpr(vcpu, 4, res);
         break;
     case H_CPPR:
         kvmppc_h_cppr(vcpu, kvmppc_get_gpr(vcpu, 4));
         break;
     case H_EOI:
         rc = kvmppc_h_eoi(vcpu, kvmppc_get_gpr(vcpu, 4));
         break;
     case H_IPI:
         rc = kvmppc_h_ipi(vcpu, kvmppc_get_gpr(vcpu, 4),
                   kvmppc_get_gpr(vcpu, 5));
         break;
     }
 
     return rc;
 }
 EXPORT_SYMBOL_GPL(kvmppc_xics_hcall);
 
 
 /* -- Initialisation code etc. -- */
 
 static void xics_debugfs_irqmap(struct seq_file *m,
                 struct kvmppc_passthru_irqmap *pimap)
 {
     int i;
 
     if (!pimap)
         return;
     seq_printf(m, "========\nPIRQ mappings: %d maps\n===========\n",
                 pimap->n_mapped);
     for (i = 0; i < pimap->n_mapped; i++)  {
         seq_printf(m, "r_hwirq=%x, v_hwirq=%x\n",
             pimap->mapped[i].r_hwirq, pimap->mapped[i].v_hwirq);
     }
 }
 
 static int xics_debug_show(struct seq_file *m, void *private)
 {
     struct kvmppc_xics *xics = m->private;
     struct kvm *kvm = xics->kvm;
     struct kvm_vcpu *vcpu;
     int icsid;
     unsigned long flags, i;
     unsigned long t_rm_kick_vcpu, t_rm_check_resend;
     unsigned long t_rm_notify_eoi;
     unsigned long t_reject, t_check_resend;
 
     if (!kvm)
         return 0;
 
     t_rm_kick_vcpu = 0;
     t_rm_notify_eoi = 0;
     t_rm_check_resend = 0;
     t_check_resend = 0;
     t_reject = 0;
 
     xics_debugfs_irqmap(m, kvm->arch.pimap);
 
     seq_printf(m, "=========\nICP state\n=========\n");
 
     kvm_for_each_vcpu(i, vcpu, kvm) {
         struct kvmppc_icp *icp = vcpu->arch.icp;
         union kvmppc_icp_state state;
 
         if (!icp)
             continue;
 
         state.raw = READ_ONCE(icp->state.raw);
         seq_printf(m, "cpu server %#lx XIRR:%#x PPRI:%#x CPPR:%#x MFRR:%#x OUT:%d NR:%d\n",
                icp->server_num, state.xisr,
                state.pending_pri, state.cppr, state.mfrr,
                state.out_ee, state.need_resend);
         t_rm_kick_vcpu += icp->n_rm_kick_vcpu;
         t_rm_notify_eoi += icp->n_rm_notify_eoi;
         t_rm_check_resend += icp->n_rm_check_resend;
         t_check_resend += icp->n_check_resend;
         t_reject += icp->n_reject;
     }
 
     seq_printf(m, "ICP Guest->Host totals: kick_vcpu=%lu check_resend=%lu notify_eoi=%lu\n",
             t_rm_kick_vcpu, t_rm_check_resend,
             t_rm_notify_eoi);
     seq_printf(m, "ICP Real Mode totals: check_resend=%lu resend=%lu\n",
             t_check_resend, t_reject);
     for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) {
         struct kvmppc_ics *ics = xics->ics[icsid];
 
         if (!ics)
             continue;
 
         seq_printf(m, "=========\nICS state for ICS 0x%x\n=========\n",
                icsid);
 
         local_irq_save(flags);
         arch_spin_lock(&ics->lock);
 
         for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
             struct ics_irq_state *irq = &ics->irq_state[i];
 
             seq_printf(m, "irq 0x%06x: server %#x prio %#x save prio %#x pq_state %d resend %d masked pending %d\n",
                    irq->number, irq->server, irq->priority,
                    irq->saved_priority, irq->pq_state,
                    irq->resend, irq->masked_pending);
 
         }
         arch_spin_unlock(&ics->lock);
         local_irq_restore(flags);
     }
     return 0;
 }
 
 DEFINE_SHOW_ATTRIBUTE(xics_debug);
 
 static void xics_debugfs_init(struct kvmppc_xics *xics)
 {
     xics->dentry = debugfs_create_file("xics", 0444, xics->kvm->debugfs_dentry,
                        xics, &xics_debug_fops);
 
     pr_debug("%s: created\n", __func__);
 }
 
 static struct kvmppc_ics *kvmppc_xics_create_ics(struct kvm *kvm,
                     struct kvmppc_xics *xics, int irq)
 {
     struct kvmppc_ics *ics;
     int i, icsid;
 
     icsid = irq >> KVMPPC_XICS_ICS_SHIFT;
 
     mutex_lock(&kvm->lock);
 
     /* ICS already exists - somebody else got here first */
     if (xics->ics[icsid])
         goto out;
 
     /* Create the ICS */
     ics = kzalloc(sizeof(struct kvmppc_ics), GFP_KERNEL);
     if (!ics)
         goto out;
 
     ics->icsid = icsid;
 
     for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
         ics->irq_state[i].number = (icsid << KVMPPC_XICS_ICS_SHIFT) | i;
         ics->irq_state[i].priority = MASKED;
         ics->irq_state[i].saved_priority = MASKED;
     }
     smp_wmb();
     xics->ics[icsid] = ics;
 
     if (icsid > xics->max_icsid)
         xics->max_icsid = icsid;
 
  out:
     mutex_unlock(&kvm->lock);
     return xics->ics[icsid];
 }
 
 static int kvmppc_xics_create_icp(struct kvm_vcpu *vcpu, unsigned long server_num)
 {
     struct kvmppc_icp *icp;
 
     if (!vcpu->kvm->arch.xics)
         return -ENODEV;
 
     if (kvmppc_xics_find_server(vcpu->kvm, server_num))
         return -EEXIST;
 
     icp = kzalloc(sizeof(struct kvmppc_icp), GFP_KERNEL);
     if (!icp)
         return -ENOMEM;
 
     icp->vcpu = vcpu;
     icp->server_num = server_num;
     icp->state.mfrr = MASKED;
     icp->state.pending_pri = MASKED;
     vcpu->arch.icp = icp;
 
     XICS_DBG("created server for vcpu %d\n", vcpu->vcpu_id);
 
     return 0;
 }
 
 u64 kvmppc_xics_get_icp(struct kvm_vcpu *vcpu)
 {
     struct kvmppc_icp *icp = vcpu->arch.icp;
     union kvmppc_icp_state state;
 
     if (!icp)
         return 0;
     state = icp->state;
     return ((u64)state.cppr << KVM_REG_PPC_ICP_CPPR_SHIFT) |
         ((u64)state.xisr << KVM_REG_PPC_ICP_XISR_SHIFT) |
         ((u64)state.mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT) |
         ((u64)state.pending_pri << KVM_REG_PPC_ICP_PPRI_SHIFT);
 }
 
 int kvmppc_xics_set_icp(struct kvm_vcpu *vcpu, u64 icpval)
 {
     struct kvmppc_icp *icp = vcpu->arch.icp;
     struct kvmppc_xics *xics = vcpu->kvm->arch.xics;
     union kvmppc_icp_state old_state, new_state;
     struct kvmppc_ics *ics;
     u8 cppr, mfrr, pending_pri;
     u32 xisr;
     u16 src;
     bool resend;
 
     if (!icp || !xics)
         return -ENOENT;
 
     cppr = icpval >> KVM_REG_PPC_ICP_CPPR_SHIFT;
     xisr = (icpval >> KVM_REG_PPC_ICP_XISR_SHIFT) &
         KVM_REG_PPC_ICP_XISR_MASK;
     mfrr = icpval >> KVM_REG_PPC_ICP_MFRR_SHIFT;
     pending_pri = icpval >> KVM_REG_PPC_ICP_PPRI_SHIFT;
 
     /* Require the new state to be internally consistent */
     if (xisr == 0) {
         if (pending_pri != 0xff)
             return -EINVAL;
     } else if (xisr == XICS_IPI) {
         if (pending_pri != mfrr || pending_pri >= cppr)
             return -EINVAL;
     } else {
         if (pending_pri >= mfrr || pending_pri >= cppr)
             return -EINVAL;
         ics = kvmppc_xics_find_ics(xics, xisr, &src);
         if (!ics)
             return -EINVAL;
     }
 
     new_state.raw = 0;
     new_state.cppr = cppr;
     new_state.xisr = xisr;
     new_state.mfrr = mfrr;
     new_state.pending_pri = pending_pri;
 
     /*
      * Deassert the CPU interrupt request.
      * icp_try_update will reassert it if necessary.
      */
     kvmppc_book3s_dequeue_irqprio(icp->vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 
     /*
      * Note that if we displace an interrupt from old_state.xisr,
      * we don't mark it as rejected.  We expect userspace to set
      * the state of the interrupt sources to be consistent with
      * the ICP states (either before or afterwards, which doesn't
      * matter).  We do handle resends due to CPPR becoming less
      * favoured because that is necessary to end up with a
      * consistent state in the situation where userspace restores
      * the ICS states before the ICP states.
      */
     do {
         old_state = READ_ONCE(icp->state);
 
         if (new_state.mfrr <= old_state.mfrr) {
             resend = false;
             new_state.need_resend = old_state.need_resend;
         } else {
             resend = old_state.need_resend;
             new_state.need_resend = 0;
         }
     } while (!icp_try_update(icp, old_state, new_state, false));
 
     if (resend)
         icp_check_resend(xics, icp);
 
     return 0;
 }
 
 static int xics_get_source(struct kvmppc_xics *xics, long irq, u64 addr)
 {
     int ret;
     struct kvmppc_ics *ics;
     struct ics_irq_state *irqp;
     u64 __user *ubufp = (u64 __user *) addr;
     u16 idx;
     u64 val, prio;
     unsigned long flags;
 
     ics = kvmppc_xics_find_ics(xics, irq, &idx);
     if (!ics)
         return -ENOENT;
 
     irqp = &ics->irq_state[idx];
     local_irq_save(flags);
     arch_spin_lock(&ics->lock);
     ret = -ENOENT;
     if (irqp->exists) {
         val = irqp->server;
         prio = irqp->priority;
         if (prio == MASKED) {
             val |= KVM_XICS_MASKED;
             prio = irqp->saved_priority;
         }
         val |= prio << KVM_XICS_PRIORITY_SHIFT;
         if (irqp->lsi) {
             val |= KVM_XICS_LEVEL_SENSITIVE;
             if (irqp->pq_state & PQ_PRESENTED)
                 val |= KVM_XICS_PENDING;
         } else if (irqp->masked_pending || irqp->resend)
             val |= KVM_XICS_PENDING;
 
         if (irqp->pq_state & PQ_PRESENTED)
             val |= KVM_XICS_PRESENTED;
 
         if (irqp->pq_state & PQ_QUEUED)
             val |= KVM_XICS_QUEUED;
 
         ret = 0;
     }
     arch_spin_unlock(&ics->lock);
     local_irq_restore(flags);
 
     if (!ret && put_user(val, ubufp))
         ret = -EFAULT;
 
     return ret;
 }
 
 static int xics_set_source(struct kvmppc_xics *xics, long irq, u64 addr)
 {
     struct kvmppc_ics *ics;
     struct ics_irq_state *irqp;
     u64 __user *ubufp = (u64 __user *) addr;
     u16 idx;
     u64 val;
     u8 prio;
     u32 server;
     unsigned long flags;
 
     if (irq < KVMPPC_XICS_FIRST_IRQ || irq >= KVMPPC_XICS_NR_IRQS)
         return -ENOENT;
 
     ics = kvmppc_xics_find_ics(xics, irq, &idx);
     if (!ics) {
         ics = kvmppc_xics_create_ics(xics->kvm, xics, irq);
         if (!ics)
             return -ENOMEM;
     }
     irqp = &ics->irq_state[idx];
     if (get_user(val, ubufp))
         return -EFAULT;
 
     server = val & KVM_XICS_DESTINATION_MASK;
     prio = val >> KVM_XICS_PRIORITY_SHIFT;
     if (prio != MASKED &&
         kvmppc_xics_find_server(xics->kvm, server) == NULL)
         return -EINVAL;
 
     local_irq_save(flags);
     arch_spin_lock(&ics->lock);
     irqp->server = server;
     irqp->saved_priority = prio;
     if (val & KVM_XICS_MASKED)
         prio = MASKED;
     irqp->priority = prio;
     irqp->resend = 0;
     irqp->masked_pending = 0;
     irqp->lsi = 0;
     irqp->pq_state = 0;
     if (val & KVM_XICS_LEVEL_SENSITIVE)
         irqp->lsi = 1;
     /* If PENDING, set P in case P is not saved because of old code */
     if (val & KVM_XICS_PRESENTED || val & KVM_XICS_PENDING)
         irqp->pq_state |= PQ_PRESENTED;
     if (val & KVM_XICS_QUEUED)
         irqp->pq_state |= PQ_QUEUED;
     irqp->exists = 1;
     arch_spin_unlock(&ics->lock);
     local_irq_restore(flags);
 
     if (val & KVM_XICS_PENDING)
         icp_deliver_irq(xics, NULL, irqp->number, false);
 
     return 0;
 }
 
 int kvmppc_xics_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
             bool line_status)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
 
     if (!xics)
         return -ENODEV;
     return ics_deliver_irq(xics, irq, level);
 }
 
 static int xics_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
 {
     struct kvmppc_xics *xics = dev->private;
 
     switch (attr->group) {
     case KVM_DEV_XICS_GRP_SOURCES:
         return xics_set_source(xics, attr->attr, attr->addr);
     }
     return -ENXIO;
 }
 
 static int xics_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
 {
     struct kvmppc_xics *xics = dev->private;
 
     switch (attr->group) {
     case KVM_DEV_XICS_GRP_SOURCES:
         return xics_get_source(xics, attr->attr, attr->addr);
     }
     return -ENXIO;
 }
 
 static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
 {
     switch (attr->group) {
     case KVM_DEV_XICS_GRP_SOURCES:
         if (attr->attr >= KVMPPC_XICS_FIRST_IRQ &&
             attr->attr < KVMPPC_XICS_NR_IRQS)
             return 0;
         break;
     }
     return -ENXIO;
 }
 
 /*
  * Called when device fd is closed. kvm->lock is held.
  */
 static void kvmppc_xics_release(struct kvm_device *dev)
 {
     struct kvmppc_xics *xics = dev->private;
     unsigned long i;
     struct kvm *kvm = xics->kvm;
     struct kvm_vcpu *vcpu;
 
     pr_devel("Releasing xics device\n");
 
     /*
      * Since this is the device release function, we know that
      * userspace does not have any open fd referring to the
      * device.  Therefore there can not be any of the device
      * attribute set/get functions being executed concurrently,
      * and similarly, the connect_vcpu and set/clr_mapped
      * functions also cannot be being executed.
      */
 
     debugfs_remove(xics->dentry);
 
     /*
      * We should clean up the vCPU interrupt presenters first.
      */
     kvm_for_each_vcpu(i, vcpu, kvm) {
         /*
          * Take vcpu->mutex to ensure that no one_reg get/set ioctl
          * (i.e. kvmppc_xics_[gs]et_icp) can be done concurrently.
          * Holding the vcpu->mutex also means that execution is
          * excluded for the vcpu until the ICP was freed. When the vcpu
          * can execute again, vcpu->arch.icp and vcpu->arch.irq_type
          * have been cleared and the vcpu will not be going into the
          * XICS code anymore.
          */
         mutex_lock(&vcpu->mutex);
         kvmppc_xics_free_icp(vcpu);
         mutex_unlock(&vcpu->mutex);
     }
 
     if (kvm)
         kvm->arch.xics = NULL;
 
     for (i = 0; i <= xics->max_icsid; i++) {
         kfree(xics->ics[i]);
         xics->ics[i] = NULL;
     }
     /*
      * A reference of the kvmppc_xics pointer is now kept under
      * the xics_device pointer of the machine for reuse. It is
      * freed when the VM is destroyed for now until we fix all the
      * execution paths.
      */
     kfree(dev);
 }
 
 static struct kvmppc_xics *kvmppc_xics_get_device(struct kvm *kvm)
 {
     struct kvmppc_xics **kvm_xics_device = &kvm->arch.xics_device;
     struct kvmppc_xics *xics = *kvm_xics_device;
 
     if (!xics) {
         xics = kzalloc(sizeof(*xics), GFP_KERNEL);
         *kvm_xics_device = xics;
     } else {
         memset(xics, 0, sizeof(*xics));
     }
 
     return xics;
 }
 
 static int kvmppc_xics_create(struct kvm_device *dev, u32 type)
 {
     struct kvmppc_xics *xics;
     struct kvm *kvm = dev->kvm;
 
     pr_devel("Creating xics for partition\n");
 
     /* Already there ? */
     if (kvm->arch.xics)
         return -EEXIST;
 
     xics = kvmppc_xics_get_device(kvm);
     if (!xics)
         return -ENOMEM;
 
     dev->private = xics;
     xics->dev = dev;
     xics->kvm = kvm;
     kvm->arch.xics = xics;
 
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
     if (cpu_has_feature(CPU_FTR_ARCH_206) &&
         cpu_has_feature(CPU_FTR_HVMODE)) {
         /* Enable real mode support */
         xics->real_mode = ENABLE_REALMODE;
         xics->real_mode_dbg = DEBUG_REALMODE;
     }
 #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
 
     return 0;
 }
 
 static void kvmppc_xics_init(struct kvm_device *dev)
 {
     struct kvmppc_xics *xics = dev->private;
 
     xics_debugfs_init(xics);
 }
 
 struct kvm_device_ops kvm_xics_ops = {
     .name = "kvm-xics",
     .create = kvmppc_xics_create,
     .init = kvmppc_xics_init,
     .release = kvmppc_xics_release,
     .set_attr = xics_set_attr,
     .get_attr = xics_get_attr,
     .has_attr = xics_has_attr,
 };
 
 int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
                  u32 xcpu)
 {
     struct kvmppc_xics *xics = dev->private;
     int r = -EBUSY;
 
     if (dev->ops != &kvm_xics_ops)
         return -EPERM;
     if (xics->kvm != vcpu->kvm)
         return -EPERM;
     if (vcpu->arch.irq_type != KVMPPC_IRQ_DEFAULT)
         return -EBUSY;
 
     r = kvmppc_xics_create_icp(vcpu, xcpu);
     if (!r)
         vcpu->arch.irq_type = KVMPPC_IRQ_XICS;
 
     return r;
 }
 
 void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu)
 {
     if (!vcpu->arch.icp)
         return;
     kfree(vcpu->arch.icp);
     vcpu->arch.icp = NULL;
     vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
 }
 
 void kvmppc_xics_set_mapped(struct kvm *kvm, unsigned long irq,
                 unsigned long host_irq)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
     struct kvmppc_ics *ics;
     u16 idx;
 
     ics = kvmppc_xics_find_ics(xics, irq, &idx);
     if (!ics)
         return;
 
     ics->irq_state[idx].host_irq = host_irq;
     ics->irq_state[idx].intr_cpu = -1;
 }
 EXPORT_SYMBOL_GPL(kvmppc_xics_set_mapped);
 
 void kvmppc_xics_clr_mapped(struct kvm *kvm, unsigned long irq,
                 unsigned long host_irq)
 {
     struct kvmppc_xics *xics = kvm->arch.xics;
     struct kvmppc_ics *ics;
     u16 idx;
 
     ics = kvmppc_xics_find_ics(xics, irq, &idx);
     if (!ics)
         return;
 
     ics->irq_state[idx].host_irq = 0;
 }
 EXPORT_SYMBOL_GPL(kvmppc_xics_clr_mapped);

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