hw/intc/xics_kvm.c - qemu - Git at Google

 /*
  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
  *
  * PAPR Virtualized Interrupt System, aka ICS/ICP aka xics, in-kernel emulation
  *
  * Copyright (c) 2013 David Gibson, IBM Corporation.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  *
  */

 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "hw/hw.h"
 #include "trace.h"
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/xics.h"
 #include "kvm_ppc.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"

 #include <sys/ioctl.h>

 typedef struct KVMXICSState {
     XICSState parent_obj;

     int kernel_xics_fd;
 } KVMXICSState;

 /*
  * ICP-KVM
  */
 static void icp_get_kvm_state(ICPState *ss)
 {
     uint64_t state;
     struct kvm_one_reg reg = {
         .id = KVM_REG_PPC_ICP_STATE,
         .addr = (uintptr_t)&state,
     };
     int ret;

     /* ICP for this CPU thread is not in use, exiting */
     if (!ss->cs) {
         return;
     }

     ret = kvm_vcpu_ioctl(ss->cs, KVM_GET_ONE_REG, &reg);
     if (ret != 0) {
         error_report("Unable to retrieve KVM interrupt controller state"
                 " for CPU %ld: %s", kvm_arch_vcpu_id(ss->cs), strerror(errno));
         exit(1);
     }

     ss->xirr = state >> KVM_REG_PPC_ICP_XISR_SHIFT;
     ss->mfrr = (state >> KVM_REG_PPC_ICP_MFRR_SHIFT)
         & KVM_REG_PPC_ICP_MFRR_MASK;
     ss->pending_priority = (state >> KVM_REG_PPC_ICP_PPRI_SHIFT)
         & KVM_REG_PPC_ICP_PPRI_MASK;
 }

 static int icp_set_kvm_state(ICPState *ss, int version_id)
 {
     uint64_t state;
     struct kvm_one_reg reg = {
         .id = KVM_REG_PPC_ICP_STATE,
         .addr = (uintptr_t)&state,
     };
     int ret;

     /* ICP for this CPU thread is not in use, exiting */
     if (!ss->cs) {
         return 0;
     }

     state = ((uint64_t)ss->xirr << KVM_REG_PPC_ICP_XISR_SHIFT)
         | ((uint64_t)ss->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
         | ((uint64_t)ss->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);

     ret = kvm_vcpu_ioctl(ss->cs, KVM_SET_ONE_REG, &reg);
     if (ret != 0) {
         error_report("Unable to restore KVM interrupt controller state (0x%"
                 PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(ss->cs),
                 strerror(errno));
         return ret;
     }

     return 0;
 }

 static void icp_kvm_reset(DeviceState *dev)
 {
     ICPState *icp = ICP(dev);

     icp->xirr = 0;
     icp->pending_priority = 0xff;
     icp->mfrr = 0xff;

     /* Make all outputs are deasserted */
     qemu_set_irq(icp->output, 0);

     icp_set_kvm_state(icp, 1);
 }

 static void icp_kvm_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     ICPStateClass *icpc = ICP_CLASS(klass);

     dc->reset = icp_kvm_reset;
     icpc->pre_save = icp_get_kvm_state;
     icpc->post_load = icp_set_kvm_state;
 }

 static const TypeInfo icp_kvm_info = {
     .name = TYPE_KVM_ICP,
     .parent = TYPE_ICP,
     .instance_size = sizeof(ICPState),
     .class_init = icp_kvm_class_init,
     .class_size = sizeof(ICPStateClass),
 };

 /*
  * ICS-KVM
  */
 static void ics_get_kvm_state(ICSState *ics)
 {
     KVMXICSState *icpkvm = KVM_XICS(ics->icp);
     uint64_t state;
     struct kvm_device_attr attr = {
         .flags = 0,
         .group = KVM_DEV_XICS_GRP_SOURCES,
         .addr = (uint64_t)(uintptr_t)&state,
     };
     int i;

     for (i = 0; i < ics->nr_irqs; i++) {
         ICSIRQState *irq = &ics->irqs[i];
         int ret;

         attr.attr = i + ics->offset;

         ret = ioctl(icpkvm->kernel_xics_fd, KVM_GET_DEVICE_ATTR, &attr);
         if (ret != 0) {
             error_report("Unable to retrieve KVM interrupt controller state"
                     " for IRQ %d: %s", i + ics->offset, strerror(errno));
             exit(1);
         }

         irq->server = state & KVM_XICS_DESTINATION_MASK;
         irq->saved_priority = (state >> KVM_XICS_PRIORITY_SHIFT)
             & KVM_XICS_PRIORITY_MASK;
         /*
          * To be consistent with the software emulation in xics.c, we
          * split out the masked state + priority that we get from the
          * kernel into 'current priority' (0xff if masked) and
          * 'saved priority' (if masked, this is the priority the
          * interrupt had before it was masked).  Masking and unmasking
          * are done with the ibm,int-off and ibm,int-on RTAS calls.
          */
         if (state & KVM_XICS_MASKED) {
             irq->priority = 0xff;
         } else {
             irq->priority = irq->saved_priority;
         }

         if (state & KVM_XICS_PENDING) {
             if (state & KVM_XICS_LEVEL_SENSITIVE) {
                 irq->status |= XICS_STATUS_ASSERTED;
             } else {
                 /*
                  * A pending edge-triggered interrupt (or MSI)
                  * must have been rejected previously when we
                  * first detected it and tried to deliver it,
                  * so mark it as pending and previously rejected
                  * for consistency with how xics.c works.
                  */
                 irq->status |= XICS_STATUS_MASKED_PENDING
                     | XICS_STATUS_REJECTED;
             }
         }
     }
 }

 static int ics_set_kvm_state(ICSState *ics, int version_id)
 {
     KVMXICSState *icpkvm = KVM_XICS(ics->icp);
     uint64_t state;
     struct kvm_device_attr attr = {
         .flags = 0,
         .group = KVM_DEV_XICS_GRP_SOURCES,
         .addr = (uint64_t)(uintptr_t)&state,
     };
     int i;

     for (i = 0; i < ics->nr_irqs; i++) {
         ICSIRQState *irq = &ics->irqs[i];
         int ret;

         attr.attr = i + ics->offset;

         state = irq->server;
         state |= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
             << KVM_XICS_PRIORITY_SHIFT;
         if (irq->priority != irq->saved_priority) {
             assert(irq->priority == 0xff);
             state |= KVM_XICS_MASKED;
         }

         if (ics->irqs[i].flags & XICS_FLAGS_IRQ_LSI) {
             state |= KVM_XICS_LEVEL_SENSITIVE;
             if (irq->status & XICS_STATUS_ASSERTED) {
                 state |= KVM_XICS_PENDING;
             }
         } else {
             if (irq->status & XICS_STATUS_MASKED_PENDING) {
                 state |= KVM_XICS_PENDING;
             }
         }

         ret = ioctl(icpkvm->kernel_xics_fd, KVM_SET_DEVICE_ATTR, &attr);
         if (ret != 0) {
             error_report("Unable to restore KVM interrupt controller state"
                     " for IRQs %d: %s", i + ics->offset, strerror(errno));
             return ret;
         }
     }

     return 0;
 }

 static void ics_kvm_set_irq(void *opaque, int srcno, int val)
 {
     ICSState *ics = opaque;
     struct kvm_irq_level args;
     int rc;

     args.irq = srcno + ics->offset;
     if (ics->irqs[srcno].flags & XICS_FLAGS_IRQ_MSI) {
         if (!val) {
             return;
         }
         args.level = KVM_INTERRUPT_SET;
     } else {
         args.level = val ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;
     }
     rc = kvm_vm_ioctl(kvm_state, KVM_IRQ_LINE, &args);
     if (rc < 0) {
         perror("kvm_irq_line");
     }
 }

 static void ics_kvm_reset(DeviceState *dev)
 {
     ICSState *ics = ICS(dev);
     int i;
     uint8_t flags[ics->nr_irqs];

     for (i = 0; i < ics->nr_irqs; i++) {
         flags[i] = ics->irqs[i].flags;
     }

     memset(ics->irqs, 0, sizeof(ICSIRQState) * ics->nr_irqs);

     for (i = 0; i < ics->nr_irqs; i++) {
         ics->irqs[i].priority = 0xff;
         ics->irqs[i].saved_priority = 0xff;
         ics->irqs[i].flags = flags[i];
     }

     ics_set_kvm_state(ics, 1);
 }

 static void ics_kvm_realize(DeviceState *dev, Error **errp)
 {
     ICSState *ics = ICS(dev);

     if (!ics->nr_irqs) {
         error_setg(errp, "Number of interrupts needs to be greater 0");
         return;
     }
     ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
     ics->qirqs = qemu_allocate_irqs(ics_kvm_set_irq, ics, ics->nr_irqs);
 }

 static void ics_kvm_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     ICSStateClass *icsc = ICS_CLASS(klass);

     dc->realize = ics_kvm_realize;
     dc->reset = ics_kvm_reset;
     icsc->pre_save = ics_get_kvm_state;
     icsc->post_load = ics_set_kvm_state;
 }

 static const TypeInfo ics_kvm_info = {
     .name = TYPE_KVM_ICS,
     .parent = TYPE_ICS,
     .instance_size = sizeof(ICSState),
     .class_init = ics_kvm_class_init,
 };

 /*
  * XICS-KVM
  */
 static void xics_kvm_cpu_setup(XICSState *icp, PowerPCCPU *cpu)
 {
     CPUState *cs;
     ICPState *ss;
     KVMXICSState *icpkvm = KVM_XICS(icp);

     cs = CPU(cpu);
     ss = &icp->ss[cs->cpu_index];

     assert(cs->cpu_index < icp->nr_servers);
     if (icpkvm->kernel_xics_fd == -1) {
         abort();
     }

     /*
      * If we are reusing a parked vCPU fd corresponding to the CPU
      * which was hot-removed earlier we don't have to renable
      * KVM_CAP_IRQ_XICS capability again.
      */
     if (ss->cap_irq_xics_enabled) {
         return;
     }

     if (icpkvm->kernel_xics_fd != -1) {
         int ret;

         ss->cs = cs;

         ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0,
                                   icpkvm->kernel_xics_fd, kvm_arch_vcpu_id(cs));
         if (ret < 0) {
             error_report("Unable to connect CPU%ld to kernel XICS: %s",
                     kvm_arch_vcpu_id(cs), strerror(errno));
             exit(1);
         }
         ss->cap_irq_xics_enabled = true;
     }
 }

 static void xics_kvm_set_nr_irqs(XICSState *icp, uint32_t nr_irqs, Error **errp)
 {
     icp->nr_irqs = icp->ics->nr_irqs = nr_irqs;
 }

 static void xics_kvm_set_nr_servers(XICSState *icp, uint32_t nr_servers,
                                     Error **errp)
 {
     int i;

     icp->nr_servers = nr_servers;

     icp->ss = g_malloc0(icp->nr_servers*sizeof(ICPState));
     for (i = 0; i < icp->nr_servers; i++) {
         char buffer[32];
         object_initialize(&icp->ss[i], sizeof(icp->ss[i]), TYPE_KVM_ICP);
         snprintf(buffer, sizeof(buffer), "icp[%d]", i);
         object_property_add_child(OBJECT(icp), buffer, OBJECT(&icp->ss[i]),
                                   errp);
     }
 }

 static void rtas_dummy(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                        uint32_t token,
                        uint32_t nargs, target_ulong args,
                        uint32_t nret, target_ulong rets)
 {
     error_report("pseries: %s must never be called for in-kernel XICS",
                  __func__);
 }

 static void xics_kvm_realize(DeviceState *dev, Error **errp)
 {
     KVMXICSState *icpkvm = KVM_XICS(dev);
     XICSState *icp = XICS_COMMON(dev);
     int i, rc;
     Error *error = NULL;
     struct kvm_create_device xics_create_device = {
         .type = KVM_DEV_TYPE_XICS,
         .flags = 0,
     };

     if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_IRQ_XICS)) {
         error_setg(errp,
                    "KVM and IRQ_XICS capability must be present for in-kernel XICS");
         goto fail;
     }

     spapr_rtas_register(RTAS_IBM_SET_XIVE, "ibm,set-xive", rtas_dummy);
     spapr_rtas_register(RTAS_IBM_GET_XIVE, "ibm,get-xive", rtas_dummy);
     spapr_rtas_register(RTAS_IBM_INT_OFF, "ibm,int-off", rtas_dummy);
     spapr_rtas_register(RTAS_IBM_INT_ON, "ibm,int-on", rtas_dummy);

     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_SET_XIVE, "ibm,set-xive");
     if (rc < 0) {
         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,set-xive");
         goto fail;
     }

     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_GET_XIVE, "ibm,get-xive");
     if (rc < 0) {
         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,get-xive");
         goto fail;
     }

     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_ON, "ibm,int-on");
     if (rc < 0) {
         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-on");
         goto fail;
     }

     rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_OFF, "ibm,int-off");
     if (rc < 0) {
         error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-off");
         goto fail;
     }

     /* Create the kernel ICP */
     rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &xics_create_device);
     if (rc < 0) {
         error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
         goto fail;
     }

     icpkvm->kernel_xics_fd = xics_create_device.fd;

     object_property_set_bool(OBJECT(icp->ics), true, "realized", &error);
     if (error) {
         error_propagate(errp, error);
         goto fail;
     }

     assert(icp->nr_servers);
     for (i = 0; i < icp->nr_servers; i++) {
         object_property_set_bool(OBJECT(&icp->ss[i]), true, "realized", &error);
         if (error) {
             error_propagate(errp, error);
             goto fail;
         }
     }

     kvm_kernel_irqchip = true;
     kvm_msi_via_irqfd_allowed = true;
     kvm_gsi_direct_mapping = true;

     return;

 fail:
     kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
     kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");
     kvmppc_define_rtas_kernel_token(0, "ibm,int-on");
     kvmppc_define_rtas_kernel_token(0, "ibm,int-off");
 }

 static void xics_kvm_initfn(Object *obj)
 {
     XICSState *xics = XICS_COMMON(obj);

     xics->ics = ICS(object_new(TYPE_KVM_ICS));
     object_property_add_child(obj, "ics", OBJECT(xics->ics), NULL);
     xics->ics->icp = xics;
 }

 static void xics_kvm_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
     XICSStateClass *xsc = XICS_COMMON_CLASS(oc);

     dc->realize = xics_kvm_realize;
     xsc->cpu_setup = xics_kvm_cpu_setup;
     xsc->set_nr_irqs = xics_kvm_set_nr_irqs;
     xsc->set_nr_servers = xics_kvm_set_nr_servers;
 }

 static const TypeInfo xics_kvm_info = {
     .name          = TYPE_KVM_XICS,
     .parent        = TYPE_XICS_COMMON,
     .instance_size = sizeof(KVMXICSState),
     .class_init    = xics_kvm_class_init,
     .instance_init = xics_kvm_initfn,
 };

 static void xics_kvm_register_types(void)
 {
     type_register_static(&xics_kvm_info);
     type_register_static(&ics_kvm_info);
     type_register_static(&icp_kvm_info);
 }

 type_init(xics_kvm_register_types)
	/*
	* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
	*
	* PAPR Virtualized Interrupt System, aka ICS/ICP aka xics, in-kernel emulation
	*
	* Copyright (c) 2013 David Gibson, IBM Corporation.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*
	*/

	#include "qemu/osdep.h"
	#include "qapi/error.h"
	#include "hw/hw.h"
	#include "trace.h"
	#include "hw/ppc/spapr.h"
	#include "hw/ppc/xics.h"
	#include "kvm_ppc.h"
	#include "qemu/config-file.h"
	#include "qemu/error-report.h"

	#include <sys/ioctl.h>

	typedef struct KVMXICSState {
	XICSState parent_obj;

	int kernel_xics_fd;
	} KVMXICSState;

	/*
	* ICP-KVM
	*/
	static void icp_get_kvm_state(ICPState *ss)
	{
	uint64_t state;
	struct kvm_one_reg reg = {
	.id = KVM_REG_PPC_ICP_STATE,
	.addr = (uintptr_t)&state,
	};
	int ret;

	/* ICP for this CPU thread is not in use, exiting */
	if (!ss->cs) {
	return;
	}

	ret = kvm_vcpu_ioctl(ss->cs, KVM_GET_ONE_REG, &reg);
	if (ret != 0) {
	error_report("Unable to retrieve KVM interrupt controller state"
	" for CPU %ld: %s", kvm_arch_vcpu_id(ss->cs), strerror(errno));
	exit(1);
	}

	ss->xirr = state >> KVM_REG_PPC_ICP_XISR_SHIFT;
	ss->mfrr = (state >> KVM_REG_PPC_ICP_MFRR_SHIFT)
	& KVM_REG_PPC_ICP_MFRR_MASK;
	ss->pending_priority = (state >> KVM_REG_PPC_ICP_PPRI_SHIFT)
	& KVM_REG_PPC_ICP_PPRI_MASK;
	}

	static int icp_set_kvm_state(ICPState *ss, int version_id)
	{
	uint64_t state;
	struct kvm_one_reg reg = {
	.id = KVM_REG_PPC_ICP_STATE,
	.addr = (uintptr_t)&state,
	};
	int ret;

	/* ICP for this CPU thread is not in use, exiting */
	if (!ss->cs) {
	return 0;
	}

	state = ((uint64_t)ss->xirr << KVM_REG_PPC_ICP_XISR_SHIFT)
	\| ((uint64_t)ss->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
	\| ((uint64_t)ss->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);

	ret = kvm_vcpu_ioctl(ss->cs, KVM_SET_ONE_REG, &reg);
	if (ret != 0) {
	error_report("Unable to restore KVM interrupt controller state (0x%"
	PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(ss->cs),
	strerror(errno));
	return ret;
	}

	return 0;
	}

	static void icp_kvm_reset(DeviceState *dev)
	{
	ICPState *icp = ICP(dev);

	icp->xirr = 0;
	icp->pending_priority = 0xff;
	icp->mfrr = 0xff;

	/* Make all outputs are deasserted */
	qemu_set_irq(icp->output, 0);

	icp_set_kvm_state(icp, 1);
	}

	static void icp_kvm_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	ICPStateClass *icpc = ICP_CLASS(klass);

	dc->reset = icp_kvm_reset;
	icpc->pre_save = icp_get_kvm_state;
	icpc->post_load = icp_set_kvm_state;
	}

	static const TypeInfo icp_kvm_info = {
	.name = TYPE_KVM_ICP,
	.parent = TYPE_ICP,
	.instance_size = sizeof(ICPState),
	.class_init = icp_kvm_class_init,
	.class_size = sizeof(ICPStateClass),
	};

	/*
	* ICS-KVM
	*/
	static void ics_get_kvm_state(ICSState *ics)
	{
	KVMXICSState *icpkvm = KVM_XICS(ics->icp);
	uint64_t state;
	struct kvm_device_attr attr = {
	.flags = 0,
	.group = KVM_DEV_XICS_GRP_SOURCES,
	.addr = (uint64_t)(uintptr_t)&state,
	};
	int i;

	for (i = 0; i < ics->nr_irqs; i++) {
	ICSIRQState *irq = &ics->irqs[i];
	int ret;

	attr.attr = i + ics->offset;

	ret = ioctl(icpkvm->kernel_xics_fd, KVM_GET_DEVICE_ATTR, &attr);
	if (ret != 0) {
	error_report("Unable to retrieve KVM interrupt controller state"
	" for IRQ %d: %s", i + ics->offset, strerror(errno));
	exit(1);
	}

	irq->server = state & KVM_XICS_DESTINATION_MASK;
	irq->saved_priority = (state >> KVM_XICS_PRIORITY_SHIFT)
	& KVM_XICS_PRIORITY_MASK;
	/*
	* To be consistent with the software emulation in xics.c, we
	* split out the masked state + priority that we get from the
	* kernel into 'current priority' (0xff if masked) and
	* 'saved priority' (if masked, this is the priority the
	* interrupt had before it was masked). Masking and unmasking
	* are done with the ibm,int-off and ibm,int-on RTAS calls.
	*/
	if (state & KVM_XICS_MASKED) {
	irq->priority = 0xff;
	} else {
	irq->priority = irq->saved_priority;
	}

	if (state & KVM_XICS_PENDING) {
	if (state & KVM_XICS_LEVEL_SENSITIVE) {
	irq->status \|= XICS_STATUS_ASSERTED;
	} else {
	/*
	* A pending edge-triggered interrupt (or MSI)
	* must have been rejected previously when we
	* first detected it and tried to deliver it,
	* so mark it as pending and previously rejected
	* for consistency with how xics.c works.
	*/
	irq->status \|= XICS_STATUS_MASKED_PENDING
	\| XICS_STATUS_REJECTED;
	}
	}
	}
	}

	static int ics_set_kvm_state(ICSState *ics, int version_id)
	{
	KVMXICSState *icpkvm = KVM_XICS(ics->icp);
	uint64_t state;
	struct kvm_device_attr attr = {
	.flags = 0,
	.group = KVM_DEV_XICS_GRP_SOURCES,
	.addr = (uint64_t)(uintptr_t)&state,
	};
	int i;

	for (i = 0; i < ics->nr_irqs; i++) {
	ICSIRQState *irq = &ics->irqs[i];
	int ret;

	attr.attr = i + ics->offset;

	state = irq->server;
	state \|= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
	<< KVM_XICS_PRIORITY_SHIFT;
	if (irq->priority != irq->saved_priority) {
	assert(irq->priority == 0xff);
	state \|= KVM_XICS_MASKED;
	}

	if (ics->irqs[i].flags & XICS_FLAGS_IRQ_LSI) {
	state \|= KVM_XICS_LEVEL_SENSITIVE;
	if (irq->status & XICS_STATUS_ASSERTED) {
	state \|= KVM_XICS_PENDING;
	}
	} else {
	if (irq->status & XICS_STATUS_MASKED_PENDING) {
	state \|= KVM_XICS_PENDING;
	}
	}

	ret = ioctl(icpkvm->kernel_xics_fd, KVM_SET_DEVICE_ATTR, &attr);
	if (ret != 0) {
	error_report("Unable to restore KVM interrupt controller state"
	" for IRQs %d: %s", i + ics->offset, strerror(errno));
	return ret;
	}
	}

	return 0;
	}

	static void ics_kvm_set_irq(void *opaque, int srcno, int val)
	{
	ICSState *ics = opaque;
	struct kvm_irq_level args;
	int rc;

	args.irq = srcno + ics->offset;
	if (ics->irqs[srcno].flags & XICS_FLAGS_IRQ_MSI) {
	if (!val) {
	return;
	}
	args.level = KVM_INTERRUPT_SET;
	} else {
	args.level = val ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;
	}
	rc = kvm_vm_ioctl(kvm_state, KVM_IRQ_LINE, &args);
	if (rc < 0) {
	perror("kvm_irq_line");
	}
	}

	static void ics_kvm_reset(DeviceState *dev)
	{
	ICSState *ics = ICS(dev);
	int i;
	uint8_t flags[ics->nr_irqs];

	for (i = 0; i < ics->nr_irqs; i++) {
	flags[i] = ics->irqs[i].flags;
	}

	memset(ics->irqs, 0, sizeof(ICSIRQState) * ics->nr_irqs);

	for (i = 0; i < ics->nr_irqs; i++) {
	ics->irqs[i].priority = 0xff;
	ics->irqs[i].saved_priority = 0xff;
	ics->irqs[i].flags = flags[i];
	}

	ics_set_kvm_state(ics, 1);
	}

	static void ics_kvm_realize(DeviceState dev, Error *errp)
	{
	ICSState *ics = ICS(dev);

	if (!ics->nr_irqs) {
	error_setg(errp, "Number of interrupts needs to be greater 0");
	return;
	}
	ics->irqs = g_malloc0(ics->nr_irqs * sizeof(ICSIRQState));
	ics->qirqs = qemu_allocate_irqs(ics_kvm_set_irq, ics, ics->nr_irqs);
	}

	static void ics_kvm_class_init(ObjectClass klass, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(klass);
	ICSStateClass *icsc = ICS_CLASS(klass);

	dc->realize = ics_kvm_realize;
	dc->reset = ics_kvm_reset;
	icsc->pre_save = ics_get_kvm_state;
	icsc->post_load = ics_set_kvm_state;
	}

	static const TypeInfo ics_kvm_info = {
	.name = TYPE_KVM_ICS,
	.parent = TYPE_ICS,
	.instance_size = sizeof(ICSState),
	.class_init = ics_kvm_class_init,
	};

	/*
	* XICS-KVM
	*/
	static void xics_kvm_cpu_setup(XICSState icp, PowerPCCPU cpu)
	{
	CPUState *cs;
	ICPState *ss;
	KVMXICSState *icpkvm = KVM_XICS(icp);

	cs = CPU(cpu);
	ss = &icp->ss[cs->cpu_index];

	assert(cs->cpu_index < icp->nr_servers);
	if (icpkvm->kernel_xics_fd == -1) {
	abort();
	}

	/*
	* If we are reusing a parked vCPU fd corresponding to the CPU
	* which was hot-removed earlier we don't have to renable
	* KVM_CAP_IRQ_XICS capability again.
	*/
	if (ss->cap_irq_xics_enabled) {
	return;
	}

	if (icpkvm->kernel_xics_fd != -1) {
	int ret;

	ss->cs = cs;

	ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0,
	icpkvm->kernel_xics_fd, kvm_arch_vcpu_id(cs));
	if (ret < 0) {
	error_report("Unable to connect CPU%ld to kernel XICS: %s",
	kvm_arch_vcpu_id(cs), strerror(errno));
	exit(1);
	}
	ss->cap_irq_xics_enabled = true;
	}
	}

	static void xics_kvm_set_nr_irqs(XICSState icp, uint32_t nr_irqs, Error *errp)
	{
	icp->nr_irqs = icp->ics->nr_irqs = nr_irqs;
	}

	static void xics_kvm_set_nr_servers(XICSState *icp, uint32_t nr_servers,
	Error **errp)
	{
	int i;

	icp->nr_servers = nr_servers;

	icp->ss = g_malloc0(icp->nr_servers*sizeof(ICPState));
	for (i = 0; i < icp->nr_servers; i++) {
	char buffer[32];
	object_initialize(&icp->ss[i], sizeof(icp->ss[i]), TYPE_KVM_ICP);
	snprintf(buffer, sizeof(buffer), "icp[%d]", i);
	object_property_add_child(OBJECT(icp), buffer, OBJECT(&icp->ss[i]),
	errp);
	}
	}

	static void rtas_dummy(PowerPCCPU cpu, sPAPRMachineState spapr,
	uint32_t token,
	uint32_t nargs, target_ulong args,
	uint32_t nret, target_ulong rets)
	{
	error_report("pseries: %s must never be called for in-kernel XICS",
	__func__);
	}

	static void xics_kvm_realize(DeviceState dev, Error *errp)
	{
	KVMXICSState *icpkvm = KVM_XICS(dev);
	XICSState *icp = XICS_COMMON(dev);
	int i, rc;
	Error *error = NULL;
	struct kvm_create_device xics_create_device = {
	.type = KVM_DEV_TYPE_XICS,
	.flags = 0,
	};

	if (!kvm_enabled() \|\| !kvm_check_extension(kvm_state, KVM_CAP_IRQ_XICS)) {
	error_setg(errp,
	"KVM and IRQ_XICS capability must be present for in-kernel XICS");
	goto fail;
	}

	spapr_rtas_register(RTAS_IBM_SET_XIVE, "ibm,set-xive", rtas_dummy);
	spapr_rtas_register(RTAS_IBM_GET_XIVE, "ibm,get-xive", rtas_dummy);
	spapr_rtas_register(RTAS_IBM_INT_OFF, "ibm,int-off", rtas_dummy);
	spapr_rtas_register(RTAS_IBM_INT_ON, "ibm,int-on", rtas_dummy);

	rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_SET_XIVE, "ibm,set-xive");
	if (rc < 0) {
	error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,set-xive");
	goto fail;
	}

	rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_GET_XIVE, "ibm,get-xive");
	if (rc < 0) {
	error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,get-xive");
	goto fail;
	}

	rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_ON, "ibm,int-on");
	if (rc < 0) {
	error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-on");
	goto fail;
	}

	rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_OFF, "ibm,int-off");
	if (rc < 0) {
	error_setg(errp, "kvmppc_define_rtas_kernel_token: ibm,int-off");
	goto fail;
	}

	/* Create the kernel ICP */
	rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &xics_create_device);
	if (rc < 0) {
	error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
	goto fail;
	}

	icpkvm->kernel_xics_fd = xics_create_device.fd;

	object_property_set_bool(OBJECT(icp->ics), true, "realized", &error);
	if (error) {
	error_propagate(errp, error);
	goto fail;
	}

	assert(icp->nr_servers);
	for (i = 0; i < icp->nr_servers; i++) {
	object_property_set_bool(OBJECT(&icp->ss[i]), true, "realized", &error);
	if (error) {
	error_propagate(errp, error);
	goto fail;
	}
	}

	kvm_kernel_irqchip = true;
	kvm_msi_via_irqfd_allowed = true;
	kvm_gsi_direct_mapping = true;

	return;

	fail:
	kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
	kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");
	kvmppc_define_rtas_kernel_token(0, "ibm,int-on");
	kvmppc_define_rtas_kernel_token(0, "ibm,int-off");
	}

	static void xics_kvm_initfn(Object *obj)
	{
	XICSState *xics = XICS_COMMON(obj);

	xics->ics = ICS(object_new(TYPE_KVM_ICS));
	object_property_add_child(obj, "ics", OBJECT(xics->ics), NULL);
	xics->ics->icp = xics;
	}

	static void xics_kvm_class_init(ObjectClass oc, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(oc);
	XICSStateClass *xsc = XICS_COMMON_CLASS(oc);

	dc->realize = xics_kvm_realize;
	xsc->cpu_setup = xics_kvm_cpu_setup;
	xsc->set_nr_irqs = xics_kvm_set_nr_irqs;
	xsc->set_nr_servers = xics_kvm_set_nr_servers;
	}

	static const TypeInfo xics_kvm_info = {
	.name = TYPE_KVM_XICS,
	.parent = TYPE_XICS_COMMON,
	.instance_size = sizeof(KVMXICSState),
	.class_init = xics_kvm_class_init,
	.instance_init = xics_kvm_initfn,
	};

	static void xics_kvm_register_types(void)
	{
	type_register_static(&xics_kvm_info);
	type_register_static(&ics_kvm_info);
	type_register_static(&icp_kvm_info);
	}

	type_init(xics_kvm_register_types)