2 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
4 * PAPR Virtualized Interrupt System, aka ICS/ICP aka xics, in-kernel emulation
6 * Copyright (c) 2013 David Gibson, IBM Corporation.
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
28 #include "qemu/osdep.h"
29 #include "qapi/error.h"
30 #include "qemu-common.h"
34 #include "sysemu/kvm.h"
35 #include "hw/ppc/spapr.h"
36 #include "hw/ppc/xics.h"
38 #include "qemu/config-file.h"
39 #include "qemu/error-report.h"
41 #include <sys/ioctl.h>
43 static int kernel_xics_fd
= -1;
45 typedef struct KVMEnabledICP
{
46 unsigned long vcpu_id
;
47 QLIST_ENTRY(KVMEnabledICP
) node
;
50 static QLIST_HEAD(, KVMEnabledICP
)
51 kvm_enabled_icps
= QLIST_HEAD_INITIALIZER(&kvm_enabled_icps
);
56 static void icp_get_kvm_state(ICPState
*icp
)
59 struct kvm_one_reg reg
= {
60 .id
= KVM_REG_PPC_ICP_STATE
,
61 .addr
= (uintptr_t)&state
,
65 /* ICP for this CPU thread is not in use, exiting */
70 ret
= kvm_vcpu_ioctl(icp
->cs
, KVM_GET_ONE_REG
, ®
);
72 error_report("Unable to retrieve KVM interrupt controller state"
73 " for CPU %ld: %s", kvm_arch_vcpu_id(icp
->cs
), strerror(errno
));
77 icp
->xirr
= state
>> KVM_REG_PPC_ICP_XISR_SHIFT
;
78 icp
->mfrr
= (state
>> KVM_REG_PPC_ICP_MFRR_SHIFT
)
79 & KVM_REG_PPC_ICP_MFRR_MASK
;
80 icp
->pending_priority
= (state
>> KVM_REG_PPC_ICP_PPRI_SHIFT
)
81 & KVM_REG_PPC_ICP_PPRI_MASK
;
84 static int icp_set_kvm_state(ICPState
*icp
, int version_id
)
87 struct kvm_one_reg reg
= {
88 .id
= KVM_REG_PPC_ICP_STATE
,
89 .addr
= (uintptr_t)&state
,
93 /* ICP for this CPU thread is not in use, exiting */
98 state
= ((uint64_t)icp
->xirr
<< KVM_REG_PPC_ICP_XISR_SHIFT
)
99 | ((uint64_t)icp
->mfrr
<< KVM_REG_PPC_ICP_MFRR_SHIFT
)
100 | ((uint64_t)icp
->pending_priority
<< KVM_REG_PPC_ICP_PPRI_SHIFT
);
102 ret
= kvm_vcpu_ioctl(icp
->cs
, KVM_SET_ONE_REG
, ®
);
104 error_report("Unable to restore KVM interrupt controller state (0x%"
105 PRIx64
") for CPU %ld: %s", state
, kvm_arch_vcpu_id(icp
->cs
),
113 static void icp_kvm_reset(ICPState
*icp
)
115 icp_set_kvm_state(icp
, 1);
118 static void icp_kvm_realize(ICPState
*icp
, Error
**errp
)
120 CPUState
*cs
= icp
->cs
;
121 KVMEnabledICP
*enabled_icp
;
122 unsigned long vcpu_id
= kvm_arch_vcpu_id(cs
);
125 if (kernel_xics_fd
== -1) {
130 * If we are reusing a parked vCPU fd corresponding to the CPU
131 * which was hot-removed earlier we don't have to renable
132 * KVM_CAP_IRQ_XICS capability again.
134 QLIST_FOREACH(enabled_icp
, &kvm_enabled_icps
, node
) {
135 if (enabled_icp
->vcpu_id
== vcpu_id
) {
140 ret
= kvm_vcpu_enable_cap(cs
, KVM_CAP_IRQ_XICS
, 0, kernel_xics_fd
, vcpu_id
);
142 error_setg(errp
, "Unable to connect CPU%ld to kernel XICS: %s", vcpu_id
,
146 enabled_icp
= g_malloc(sizeof(*enabled_icp
));
147 enabled_icp
->vcpu_id
= vcpu_id
;
148 QLIST_INSERT_HEAD(&kvm_enabled_icps
, enabled_icp
, node
);
151 static void icp_kvm_class_init(ObjectClass
*klass
, void *data
)
153 ICPStateClass
*icpc
= ICP_CLASS(klass
);
155 icpc
->pre_save
= icp_get_kvm_state
;
156 icpc
->post_load
= icp_set_kvm_state
;
157 icpc
->realize
= icp_kvm_realize
;
158 icpc
->reset
= icp_kvm_reset
;
161 static const TypeInfo icp_kvm_info
= {
162 .name
= TYPE_KVM_ICP
,
164 .instance_size
= sizeof(ICPState
),
165 .class_init
= icp_kvm_class_init
,
166 .class_size
= sizeof(ICPStateClass
),
172 static void ics_get_kvm_state(ICSState
*ics
)
175 struct kvm_device_attr attr
= {
177 .group
= KVM_DEV_XICS_GRP_SOURCES
,
178 .addr
= (uint64_t)(uintptr_t)&state
,
182 for (i
= 0; i
< ics
->nr_irqs
; i
++) {
183 ICSIRQState
*irq
= &ics
->irqs
[i
];
186 attr
.attr
= i
+ ics
->offset
;
188 ret
= ioctl(kernel_xics_fd
, KVM_GET_DEVICE_ATTR
, &attr
);
190 error_report("Unable to retrieve KVM interrupt controller state"
191 " for IRQ %d: %s", i
+ ics
->offset
, strerror(errno
));
195 irq
->server
= state
& KVM_XICS_DESTINATION_MASK
;
196 irq
->saved_priority
= (state
>> KVM_XICS_PRIORITY_SHIFT
)
197 & KVM_XICS_PRIORITY_MASK
;
199 * To be consistent with the software emulation in xics.c, we
200 * split out the masked state + priority that we get from the
201 * kernel into 'current priority' (0xff if masked) and
202 * 'saved priority' (if masked, this is the priority the
203 * interrupt had before it was masked). Masking and unmasking
204 * are done with the ibm,int-off and ibm,int-on RTAS calls.
206 if (state
& KVM_XICS_MASKED
) {
207 irq
->priority
= 0xff;
209 irq
->priority
= irq
->saved_priority
;
213 if (state
& KVM_XICS_PENDING
) {
214 if (state
& KVM_XICS_LEVEL_SENSITIVE
) {
215 irq
->status
|= XICS_STATUS_ASSERTED
;
218 * A pending edge-triggered interrupt (or MSI)
219 * must have been rejected previously when we
220 * first detected it and tried to deliver it,
221 * so mark it as pending and previously rejected
222 * for consistency with how xics.c works.
224 irq
->status
|= XICS_STATUS_MASKED_PENDING
225 | XICS_STATUS_REJECTED
;
228 if (state
& KVM_XICS_PRESENTED
) {
229 irq
->status
|= XICS_STATUS_PRESENTED
;
231 if (state
& KVM_XICS_QUEUED
) {
232 irq
->status
|= XICS_STATUS_QUEUED
;
237 static int ics_set_kvm_state(ICSState
*ics
, int version_id
)
240 struct kvm_device_attr attr
= {
242 .group
= KVM_DEV_XICS_GRP_SOURCES
,
243 .addr
= (uint64_t)(uintptr_t)&state
,
247 for (i
= 0; i
< ics
->nr_irqs
; i
++) {
248 ICSIRQState
*irq
= &ics
->irqs
[i
];
251 attr
.attr
= i
+ ics
->offset
;
254 state
|= (uint64_t)(irq
->saved_priority
& KVM_XICS_PRIORITY_MASK
)
255 << KVM_XICS_PRIORITY_SHIFT
;
256 if (irq
->priority
!= irq
->saved_priority
) {
257 assert(irq
->priority
== 0xff);
258 state
|= KVM_XICS_MASKED
;
261 if (ics
->irqs
[i
].flags
& XICS_FLAGS_IRQ_LSI
) {
262 state
|= KVM_XICS_LEVEL_SENSITIVE
;
263 if (irq
->status
& XICS_STATUS_ASSERTED
) {
264 state
|= KVM_XICS_PENDING
;
267 if (irq
->status
& XICS_STATUS_MASKED_PENDING
) {
268 state
|= KVM_XICS_PENDING
;
271 if (irq
->status
& XICS_STATUS_PRESENTED
) {
272 state
|= KVM_XICS_PRESENTED
;
274 if (irq
->status
& XICS_STATUS_QUEUED
) {
275 state
|= KVM_XICS_QUEUED
;
278 ret
= ioctl(kernel_xics_fd
, KVM_SET_DEVICE_ATTR
, &attr
);
280 error_report("Unable to restore KVM interrupt controller state"
281 " for IRQs %d: %s", i
+ ics
->offset
, strerror(errno
));
289 static void ics_kvm_set_irq(void *opaque
, int srcno
, int val
)
291 ICSState
*ics
= opaque
;
292 struct kvm_irq_level args
;
295 args
.irq
= srcno
+ ics
->offset
;
296 if (ics
->irqs
[srcno
].flags
& XICS_FLAGS_IRQ_MSI
) {
300 args
.level
= KVM_INTERRUPT_SET
;
302 args
.level
= val
? KVM_INTERRUPT_SET_LEVEL
: KVM_INTERRUPT_UNSET
;
304 rc
= kvm_vm_ioctl(kvm_state
, KVM_IRQ_LINE
, &args
);
306 perror("kvm_irq_line");
310 static void ics_kvm_reset(void *dev
)
312 ICSState
*ics
= ICS_SIMPLE(dev
);
314 uint8_t flags
[ics
->nr_irqs
];
316 for (i
= 0; i
< ics
->nr_irqs
; i
++) {
317 flags
[i
] = ics
->irqs
[i
].flags
;
320 memset(ics
->irqs
, 0, sizeof(ICSIRQState
) * ics
->nr_irqs
);
322 for (i
= 0; i
< ics
->nr_irqs
; i
++) {
323 ics
->irqs
[i
].priority
= 0xff;
324 ics
->irqs
[i
].saved_priority
= 0xff;
325 ics
->irqs
[i
].flags
= flags
[i
];
328 ics_set_kvm_state(ics
, 1);
331 static void ics_kvm_realize(ICSState
*ics
, Error
**errp
)
334 error_setg(errp
, "Number of interrupts needs to be greater 0");
337 ics
->irqs
= g_malloc0(ics
->nr_irqs
* sizeof(ICSIRQState
));
338 ics
->qirqs
= qemu_allocate_irqs(ics_kvm_set_irq
, ics
, ics
->nr_irqs
);
340 qemu_register_reset(ics_kvm_reset
, ics
);
343 static void ics_kvm_class_init(ObjectClass
*klass
, void *data
)
345 ICSStateClass
*icsc
= ICS_BASE_CLASS(klass
);
347 icsc
->realize
= ics_kvm_realize
;
348 icsc
->pre_save
= ics_get_kvm_state
;
349 icsc
->post_load
= ics_set_kvm_state
;
352 static const TypeInfo ics_kvm_info
= {
353 .name
= TYPE_ICS_KVM
,
354 .parent
= TYPE_ICS_SIMPLE
,
355 .instance_size
= sizeof(ICSState
),
356 .class_init
= ics_kvm_class_init
,
363 static void rtas_dummy(PowerPCCPU
*cpu
, sPAPRMachineState
*spapr
,
365 uint32_t nargs
, target_ulong args
,
366 uint32_t nret
, target_ulong rets
)
368 error_report("pseries: %s must never be called for in-kernel XICS",
372 int xics_kvm_init(sPAPRMachineState
*spapr
, Error
**errp
)
375 struct kvm_create_device xics_create_device
= {
376 .type
= KVM_DEV_TYPE_XICS
,
380 if (!kvm_enabled() || !kvm_check_extension(kvm_state
, KVM_CAP_IRQ_XICS
)) {
382 "KVM and IRQ_XICS capability must be present for in-kernel XICS");
386 spapr_rtas_register(RTAS_IBM_SET_XIVE
, "ibm,set-xive", rtas_dummy
);
387 spapr_rtas_register(RTAS_IBM_GET_XIVE
, "ibm,get-xive", rtas_dummy
);
388 spapr_rtas_register(RTAS_IBM_INT_OFF
, "ibm,int-off", rtas_dummy
);
389 spapr_rtas_register(RTAS_IBM_INT_ON
, "ibm,int-on", rtas_dummy
);
391 rc
= kvmppc_define_rtas_kernel_token(RTAS_IBM_SET_XIVE
, "ibm,set-xive");
393 error_setg(errp
, "kvmppc_define_rtas_kernel_token: ibm,set-xive");
397 rc
= kvmppc_define_rtas_kernel_token(RTAS_IBM_GET_XIVE
, "ibm,get-xive");
399 error_setg(errp
, "kvmppc_define_rtas_kernel_token: ibm,get-xive");
403 rc
= kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_ON
, "ibm,int-on");
405 error_setg(errp
, "kvmppc_define_rtas_kernel_token: ibm,int-on");
409 rc
= kvmppc_define_rtas_kernel_token(RTAS_IBM_INT_OFF
, "ibm,int-off");
411 error_setg(errp
, "kvmppc_define_rtas_kernel_token: ibm,int-off");
415 /* Create the kernel ICP */
416 rc
= kvm_vm_ioctl(kvm_state
, KVM_CREATE_DEVICE
, &xics_create_device
);
418 error_setg_errno(errp
, -rc
, "Error on KVM_CREATE_DEVICE for XICS");
422 kernel_xics_fd
= xics_create_device
.fd
;
424 kvm_kernel_irqchip
= true;
425 kvm_msi_via_irqfd_allowed
= true;
426 kvm_gsi_direct_mapping
= true;
431 kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
432 kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");
433 kvmppc_define_rtas_kernel_token(0, "ibm,int-on");
434 kvmppc_define_rtas_kernel_token(0, "ibm,int-off");
438 static void xics_kvm_register_types(void)
440 type_register_static(&ics_kvm_info
);
441 type_register_static(&icp_kvm_info
);
444 type_init(xics_kvm_register_types
)