qemu/hw/intc/xics_kvm.c

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/*
* 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"
2016-03-14 11:01:28 +03:00
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/hw.h"
#include "trace.h"
#include "sysemu/kvm.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>
static int kernel_xics_fd = -1;
typedef struct KVMEnabledICP {
unsigned long vcpu_id;
QLIST_ENTRY(KVMEnabledICP) node;
} KVMEnabledICP;
static QLIST_HEAD(, KVMEnabledICP)
kvm_enabled_icps = QLIST_HEAD_INITIALIZER(&kvm_enabled_icps);
/*
* ICP-KVM
*/
static void icp_get_kvm_state(ICPState *icp)
{
uint64_t state;
int ret;
/* ICP for this CPU thread is not in use, exiting */
if (!icp->cs) {
return;
}
ret = kvm_get_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state);
if (ret != 0) {
error_report("Unable to retrieve KVM interrupt controller state"
" for CPU %ld: %s", kvm_arch_vcpu_id(icp->cs), strerror(errno));
exit(1);
}
icp->xirr = state >> KVM_REG_PPC_ICP_XISR_SHIFT;
icp->mfrr = (state >> KVM_REG_PPC_ICP_MFRR_SHIFT)
& KVM_REG_PPC_ICP_MFRR_MASK;
icp->pending_priority = (state >> KVM_REG_PPC_ICP_PPRI_SHIFT)
& KVM_REG_PPC_ICP_PPRI_MASK;
}
static void do_icp_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
{
icp_get_kvm_state(arg.host_ptr);
}
static void icp_synchronize_state(ICPState *icp)
{
if (icp->cs) {
run_on_cpu(icp->cs, do_icp_synchronize_state, RUN_ON_CPU_HOST_PTR(icp));
}
}
static int icp_set_kvm_state(ICPState *icp, int version_id)
{
uint64_t state;
int ret;
/* ICP for this CPU thread is not in use, exiting */
if (!icp->cs) {
return 0;
}
state = ((uint64_t)icp->xirr << KVM_REG_PPC_ICP_XISR_SHIFT)
| ((uint64_t)icp->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
| ((uint64_t)icp->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);
ret = kvm_set_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state);
if (ret != 0) {
error_report("Unable to restore KVM interrupt controller state (0x%"
PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(icp->cs),
strerror(errno));
return ret;
}
return 0;
}
static void icp_kvm_reset(ICPState *icp)
{
icp_set_kvm_state(icp, 1);
}
static void icp_kvm_realize(ICPState *icp, Error **errp)
{
CPUState *cs = icp->cs;
KVMEnabledICP *enabled_icp;
unsigned long vcpu_id = kvm_arch_vcpu_id(cs);
int ret;
if (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.
*/
QLIST_FOREACH(enabled_icp, &kvm_enabled_icps, node) {
if (enabled_icp->vcpu_id == vcpu_id) {
return;
}
}
ret = kvm_vcpu_enable_cap(cs, KVM_CAP_IRQ_XICS, 0, kernel_xics_fd, vcpu_id);
if (ret < 0) {
error_setg(errp, "Unable to connect CPU%ld to kernel XICS: %s", vcpu_id,
strerror(errno));
return;
}
enabled_icp = g_malloc(sizeof(*enabled_icp));
enabled_icp->vcpu_id = vcpu_id;
QLIST_INSERT_HEAD(&kvm_enabled_icps, enabled_icp, node);
}
static void icp_kvm_class_init(ObjectClass *klass, void *data)
{
ICPStateClass *icpc = ICP_CLASS(klass);
icpc->pre_save = icp_get_kvm_state;
icpc->post_load = icp_set_kvm_state;
icpc->realize = icp_kvm_realize;
icpc->reset = icp_kvm_reset;
icpc->synchronize_state = icp_synchronize_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)
{
uint64_t state;
int i;
Error *local_err = NULL;
for (i = 0; i < ics->nr_irqs; i++) {
ICSIRQState *irq = &ics->irqs[i];
kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
i + ics->offset, &state, false, &local_err);
if (local_err) {
error_report_err(local_err);
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;
}
irq->status = 0;
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;
}
}
if (state & KVM_XICS_PRESENTED) {
irq->status |= XICS_STATUS_PRESENTED;
}
if (state & KVM_XICS_QUEUED) {
irq->status |= XICS_STATUS_QUEUED;
}
}
}
static void ics_synchronize_state(ICSState *ics)
{
ics_get_kvm_state(ics);
}
static int ics_set_kvm_state(ICSState *ics, int version_id)
{
uint64_t state;
int i;
Error *local_err = NULL;
for (i = 0; i < ics->nr_irqs; i++) {
ICSIRQState *irq = &ics->irqs[i];
int ret;
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;
}
}
if (irq->status & XICS_STATUS_PRESENTED) {
state |= KVM_XICS_PRESENTED;
}
if (irq->status & XICS_STATUS_QUEUED) {
state |= KVM_XICS_QUEUED;
}
ret = kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
i + ics->offset, &state, true, &local_err);
if (local_err) {
error_report_err(local_err);
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(void *dev)
{
ICSState *ics = ICS_SIMPLE(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(ICSState *ics, Error **errp)
{
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);
qemu_register_reset(ics_kvm_reset, ics);
}
static void ics_kvm_class_init(ObjectClass *klass, void *data)
{
ICSStateClass *icsc = ICS_BASE_CLASS(klass);
icsc->realize = ics_kvm_realize;
icsc->pre_save = ics_get_kvm_state;
icsc->post_load = ics_set_kvm_state;
icsc->synchronize_state = ics_synchronize_state;
}
static const TypeInfo ics_kvm_info = {
.name = TYPE_ICS_KVM,
.parent = TYPE_ICS_SIMPLE,
.instance_size = sizeof(ICSState),
.class_init = ics_kvm_class_init,
};
/*
* XICS-KVM
*/
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__);
}
int xics_kvm_init(sPAPRMachineState *spapr, Error **errp)
{
int rc;
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 KVM XICS device */
rc = kvm_create_device(kvm_state, KVM_DEV_TYPE_XICS, false);
if (rc < 0) {
error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
goto fail;
}
kernel_xics_fd = rc;
kvm_kernel_irqchip = true;
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_direct_mapping = true;
return 0;
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");
return -1;
}
static void xics_kvm_register_types(void)
{
type_register_static(&ics_kvm_info);
type_register_static(&icp_kvm_info);
}
type_init(xics_kvm_register_types)