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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"
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include "trace.h"
#include "sysemu/kvm.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_cpu_core.h"
#include "hw/ppc/xics.h"
#include "hw/ppc/xics_spapr.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);
static void kvm_disable_icps(void)
{
KVMEnabledICP *enabled_icp, *next;
QLIST_FOREACH_SAFE(enabled_icp, &kvm_enabled_icps, node, next) {
QLIST_REMOVE(enabled_icp, node);
g_free(enabled_icp);
}
}
/*
* ICP-KVM
*/
void icp_get_kvm_state(ICPState *icp)
{
uint64_t state;
int ret;
/* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
return;
}
/* 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);
}
void icp_synchronize_state(ICPState *icp)
{
if (icp->cs) {
run_on_cpu(icp->cs, do_icp_synchronize_state, RUN_ON_CPU_HOST_PTR(icp));
}
}
int icp_set_kvm_state(ICPState *icp, Error **errp)
{
uint64_t state;
int ret;
/* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
return 0;
}
/* 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_setg_errno(errp, -ret,
"Unable to restore KVM interrupt controller state (0x%"
PRIx64 ") for CPU %ld", state,
kvm_arch_vcpu_id(icp->cs));
return ret;
}
return 0;
}
void icp_kvm_realize(DeviceState *dev, Error **errp)
{
ICPState *icp = ICP(dev);
CPUState *cs;
KVMEnabledICP *enabled_icp;
unsigned long vcpu_id;
int ret;
/* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
return;
}
cs = icp->cs;
vcpu_id = kvm_arch_vcpu_id(cs);
/*
* 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 *local_err = NULL;
error_setg(&local_err, "Unable to connect CPU%ld to kernel XICS: %s",
vcpu_id, strerror(errno));
if (errno == ENOSPC) {
error_append_hint(&local_err, "Try -smp maxcpus=N with N < %u\n",
MACHINE(qdev_get_machine())->smp.max_cpus);
}
error_propagate(errp, local_err);
return;
}
enabled_icp = g_malloc(sizeof(*enabled_icp));
enabled_icp->vcpu_id = vcpu_id;
QLIST_INSERT_HEAD(&kvm_enabled_icps, enabled_icp, node);
}
/*
* ICS-KVM
*/
void ics_get_kvm_state(ICSState *ics)
{
uint64_t state;
int i;
/* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
return;
}
for (i = 0; i < ics->nr_irqs; i++) {
ICSIRQState *irq = &ics->irqs[i];
if (ics_irq_free(ics, i)) {
continue;
}
kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
i + ics->offset, &state, false, &error_fatal);
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;
}
}
}
void ics_synchronize_state(ICSState *ics)
{
ics_get_kvm_state(ics);
}
int ics_set_kvm_state_one(ICSState *ics, int srcno, Error **errp)
{
uint64_t state;
ICSIRQState *irq = &ics->irqs[srcno];
int ret;
/* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
return 0;
}
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);
}
if (irq->priority == 0xff) {
state |= KVM_XICS_MASKED;
}
if (irq->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,
srcno + ics->offset, &state, true, errp);
if (ret < 0) {
return ret;
}
return 0;
}
int ics_set_kvm_state(ICSState *ics, Error **errp)
{
int i;
/* The KVM XICS device is not in use */
if (kernel_xics_fd == -1) {
return 0;
}
for (i = 0; i < ics->nr_irqs; i++) {
Error *local_err = NULL;
int ret;
if (ics_irq_free(ics, i)) {
continue;
}
ret = ics_set_kvm_state_one(ics, i, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return ret;
}
}
return 0;
}
void ics_kvm_set_irq(ICSState *ics, int srcno, int val)
{
struct kvm_irq_level args;
int rc;
/* The KVM XICS device should be in use */
assert(kernel_xics_fd != -1);
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");
}
}
int xics_kvm_connect(SpaprInterruptController *intc, uint32_t nr_servers,
Error **errp)
{
ICSState *ics = ICS_SPAPR(intc);
int rc;
CPUState *cs;
Error *local_err = NULL;
/*
* The KVM XICS device already in use. This is the case when
* rebooting under the XICS-only interrupt mode.
*/
if (kernel_xics_fd != -1) {
return 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");
return -1;
}
rc = kvmppc_define_rtas_kernel_token(RTAS_IBM_SET_XIVE, "ibm,set-xive");
if (rc < 0) {
error_setg_errno(&local_err, -rc,
"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_errno(&local_err, -rc,
"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_errno(&local_err, -rc,
"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_errno(&local_err, -rc,
"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(&local_err, -rc, "Error on KVM_CREATE_DEVICE for XICS");
goto fail;
}
/* Tell KVM about the # of VCPUs we may have (POWER9 and newer only) */
if (kvm_device_check_attr(rc, KVM_DEV_XICS_GRP_CTRL,
KVM_DEV_XICS_NR_SERVERS)) {
if (kvm_device_access(rc, KVM_DEV_XICS_GRP_CTRL,
KVM_DEV_XICS_NR_SERVERS, &nr_servers, true,
&local_err)) {
goto fail;
}
}
kernel_xics_fd = rc;
kvm_kernel_irqchip = true;
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_direct_mapping = true;
/* Create the presenters */
CPU_FOREACH(cs) {
PowerPCCPU *cpu = POWERPC_CPU(cs);
icp_kvm_realize(DEVICE(spapr_cpu_state(cpu)->icp), &local_err);
if (local_err) {
goto fail;
}
}
/* Update the KVM sources */
ics_set_kvm_state(ics, &local_err);
if (local_err) {
goto fail;
}
/* Connect the presenters to the initial VCPUs of the machine */
CPU_FOREACH(cs) {
PowerPCCPU *cpu = POWERPC_CPU(cs);
icp_set_kvm_state(spapr_cpu_state(cpu)->icp, &local_err);
if (local_err) {
goto fail;
}
}
return 0;
fail:
error_propagate(errp, local_err);
xics_kvm_disconnect(intc);
return -1;
}
void xics_kvm_disconnect(SpaprInterruptController *intc)
{
/*
* Only on P9 using the XICS-on XIVE KVM device:
*
* When the KVM device fd is closed, the device is destroyed and
* removed from the list of devices of the VM. The VCPU presenters
* are also detached from the device.
*/
if (kernel_xics_fd != -1) {
close(kernel_xics_fd);
kernel_xics_fd = -1;
}
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");
kvm_kernel_irqchip = false;
kvm_msi_via_irqfd_allowed = false;
kvm_gsi_direct_mapping = false;
/* Clear the presenter from the VCPUs */
kvm_disable_icps();
}
/*
* This is a heuristic to detect older KVMs on POWER9 hosts that don't
* support destruction of a KVM XICS device while the VM is running.
* Required to start a spapr machine with ic-mode=dual,kernel-irqchip=on.
*/
bool xics_kvm_has_broken_disconnect(SpaprMachineState *spapr)
{
int rc;
rc = kvm_create_device(kvm_state, KVM_DEV_TYPE_XICS, false);
if (rc < 0) {
/*
* The error is ignored on purpose. The KVM XICS setup code
* will catch it again anyway. The goal here is to see if
* close() actually destroys the device or not.
*/
return false;
}
close(rc);
rc = kvm_create_device(kvm_state, KVM_DEV_TYPE_XICS, false);
if (rc >= 0) {
close(rc);
return false;
}
return errno == EEXIST;
}
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