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310cda5b5e
qemu/hw/intc/spapr_xive_kvm.c
Cédric Le Goater 310cda5b5e spapr/xive: Fix migration of hot-plugged CPUs 
The migration sequence of a guest using the XIVE exploitation mode
relies on the fact that the states of all devices are restored before
the machine is. This is not true for hot-plug devices such as CPUs
which state come after the machine. This breaks migration because the
thread interrupt context registers are not correctly set.

Fix migration of hotplugged CPUs by restoring their context in the
'post_load' handler of the XiveTCTX model.

Fixes: 277dd3d771 ("spapr/xive: add migration support for KVM")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20190813064853.29310-1-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2019-08-13 16:50:30 +10:00

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/*
* QEMU PowerPC sPAPR XIVE interrupt controller model
*
* Copyright (c) 2017-2019, IBM Corporation.
*
* This code is licensed under the GPL version 2 or later. See the
* COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "target/ppc/cpu.h"
#include "sysemu/cpus.h"
#include "sysemu/kvm.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_cpu_core.h"
#include "hw/ppc/spapr_xive.h"
#include "hw/ppc/xive.h"
#include "kvm_ppc.h"
#include <sys/ioctl.h>
/*
* Helpers for CPU hotplug
*
* TODO: make a common KVMEnabledCPU layer for XICS and XIVE
*/
typedef struct KVMEnabledCPU {
unsigned long vcpu_id;
QLIST_ENTRY(KVMEnabledCPU) node;
} KVMEnabledCPU;
static QLIST_HEAD(, KVMEnabledCPU)
kvm_enabled_cpus = QLIST_HEAD_INITIALIZER(&kvm_enabled_cpus);
static bool kvm_cpu_is_enabled(CPUState *cs)
{
KVMEnabledCPU *enabled_cpu;
unsigned long vcpu_id = kvm_arch_vcpu_id(cs);
QLIST_FOREACH(enabled_cpu, &kvm_enabled_cpus, node) {
if (enabled_cpu->vcpu_id == vcpu_id) {
return true;
}
}
return false;
}
static void kvm_cpu_enable(CPUState *cs)
{
KVMEnabledCPU *enabled_cpu;
unsigned long vcpu_id = kvm_arch_vcpu_id(cs);
enabled_cpu = g_malloc(sizeof(*enabled_cpu));
enabled_cpu->vcpu_id = vcpu_id;
QLIST_INSERT_HEAD(&kvm_enabled_cpus, enabled_cpu, node);
}
static void kvm_cpu_disable_all(void)
{
KVMEnabledCPU *enabled_cpu, *next;
QLIST_FOREACH_SAFE(enabled_cpu, &kvm_enabled_cpus, node, next) {
QLIST_REMOVE(enabled_cpu, node);
g_free(enabled_cpu);
}
}
/*
* XIVE Thread Interrupt Management context (KVM)
*/
void kvmppc_xive_cpu_set_state(XiveTCTX *tctx, Error **errp)
{
SpaprXive *xive = SPAPR_MACHINE(qdev_get_machine())->xive;
uint64_t state[2];
int ret;
/* The KVM XIVE device is not in use yet */
if (xive->fd == -1) {
return;
}
/* word0 and word1 of the OS ring. */
state[0] = *((uint64_t *) &tctx->regs[TM_QW1_OS]);
ret = kvm_set_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
if (ret != 0) {
error_setg_errno(errp, errno,
"XIVE: could not restore KVM state of CPU %ld",
kvm_arch_vcpu_id(tctx->cs));
}
}
void kvmppc_xive_cpu_get_state(XiveTCTX *tctx, Error **errp)
{
SpaprXive *xive = SPAPR_MACHINE(qdev_get_machine())->xive;
uint64_t state[2] = { 0 };
int ret;
/* The KVM XIVE device is not in use */
if (xive->fd == -1) {
return;
}
ret = kvm_get_one_reg(tctx->cs, KVM_REG_PPC_VP_STATE, state);
if (ret != 0) {
error_setg_errno(errp, errno,
"XIVE: could not capture KVM state of CPU %ld",
kvm_arch_vcpu_id(tctx->cs));
return;
}
/* word0 and word1 of the OS ring. */
*((uint64_t *) &tctx->regs[TM_QW1_OS]) = state[0];
}
typedef struct {
XiveTCTX *tctx;
Error *err;
} XiveCpuGetState;
static void kvmppc_xive_cpu_do_synchronize_state(CPUState *cpu,
run_on_cpu_data arg)
{
XiveCpuGetState *s = arg.host_ptr;
kvmppc_xive_cpu_get_state(s->tctx, &s->err);
}
void kvmppc_xive_cpu_synchronize_state(XiveTCTX *tctx, Error **errp)
{
XiveCpuGetState s = {
.tctx = tctx,
.err = NULL,
};
/*
* Kick the vCPU to make sure they are available for the KVM ioctl.
*/
run_on_cpu(tctx->cs, kvmppc_xive_cpu_do_synchronize_state,
RUN_ON_CPU_HOST_PTR(&s));
if (s.err) {
error_propagate(errp, s.err);
return;
}
}
void kvmppc_xive_cpu_connect(XiveTCTX *tctx, Error **errp)
{
SpaprXive *xive = SPAPR_MACHINE(qdev_get_machine())->xive;
unsigned long vcpu_id;
int ret;
/* The KVM XIVE device is not in use */
if (xive->fd == -1) {
return;
}
/* Check if CPU was hot unplugged and replugged. */
if (kvm_cpu_is_enabled(tctx->cs)) {
return;
}
vcpu_id = kvm_arch_vcpu_id(tctx->cs);
ret = kvm_vcpu_enable_cap(tctx->cs, KVM_CAP_PPC_IRQ_XIVE, 0, xive->fd,
vcpu_id, 0);
if (ret < 0) {
error_setg(errp, "XIVE: unable to connect CPU%ld to KVM device: %s",
vcpu_id, strerror(errno));
return;
}
kvm_cpu_enable(tctx->cs);
}
/*
* XIVE Interrupt Source (KVM)
*/
void kvmppc_xive_set_source_config(SpaprXive *xive, uint32_t lisn, XiveEAS *eas,
Error **errp)
{
uint32_t end_idx;
uint32_t end_blk;
uint8_t priority;
uint32_t server;
bool masked;
uint32_t eisn;
uint64_t kvm_src;
Error *local_err = NULL;
assert(xive_eas_is_valid(eas));
end_idx = xive_get_field64(EAS_END_INDEX, eas->w);
end_blk = xive_get_field64(EAS_END_BLOCK, eas->w);
eisn = xive_get_field64(EAS_END_DATA, eas->w);
masked = xive_eas_is_masked(eas);
spapr_xive_end_to_target(end_blk, end_idx, &server, &priority);
kvm_src = priority << KVM_XIVE_SOURCE_PRIORITY_SHIFT &
KVM_XIVE_SOURCE_PRIORITY_MASK;
kvm_src |= server << KVM_XIVE_SOURCE_SERVER_SHIFT &
KVM_XIVE_SOURCE_SERVER_MASK;
kvm_src |= ((uint64_t) masked << KVM_XIVE_SOURCE_MASKED_SHIFT) &
KVM_XIVE_SOURCE_MASKED_MASK;
kvm_src |= ((uint64_t)eisn << KVM_XIVE_SOURCE_EISN_SHIFT) &
KVM_XIVE_SOURCE_EISN_MASK;
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE_CONFIG, lisn,
&kvm_src, true, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
void kvmppc_xive_sync_source(SpaprXive *xive, uint32_t lisn, Error **errp)
{
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE_SYNC, lisn,
NULL, true, errp);
}
/*
* At reset, the interrupt sources are simply created and MASKED. We
* only need to inform the KVM XIVE device about their type: LSI or
* MSI.
*/
void kvmppc_xive_source_reset_one(XiveSource *xsrc, int srcno, Error **errp)
{
SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
uint64_t state = 0;
/* The KVM XIVE device is not in use */
if (xive->fd == -1) {
return;
}
if (xive_source_irq_is_lsi(xsrc, srcno)) {
state |= KVM_XIVE_LEVEL_SENSITIVE;
if (xsrc->status[srcno] & XIVE_STATUS_ASSERTED) {
state |= KVM_XIVE_LEVEL_ASSERTED;
}
}
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_SOURCE, srcno, &state,
true, errp);
}
static void kvmppc_xive_source_reset(XiveSource *xsrc, Error **errp)
{
int i;
for (i = 0; i < xsrc->nr_irqs; i++) {
Error *local_err = NULL;
kvmppc_xive_source_reset_one(xsrc, i, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
}
/*
* This is used to perform the magic loads on the ESB pages, described
* in xive.h.
*
* Memory barriers should not be needed for loads (no store for now).
*/
static uint64_t xive_esb_rw(XiveSource *xsrc, int srcno, uint32_t offset,
uint64_t data, bool write)
{
uint64_t *addr = xsrc->esb_mmap + xive_source_esb_mgmt(xsrc, srcno) +
offset;
if (write) {
*addr = cpu_to_be64(data);
return -1;
} else {
/* Prevent the compiler from optimizing away the load */
volatile uint64_t value = be64_to_cpu(*addr);
return value;
}
}
static uint8_t xive_esb_read(XiveSource *xsrc, int srcno, uint32_t offset)
{
return xive_esb_rw(xsrc, srcno, offset, 0, 0) & 0x3;
}
static void xive_esb_trigger(XiveSource *xsrc, int srcno)
{
uint64_t *addr = xsrc->esb_mmap + xive_source_esb_page(xsrc, srcno);
*addr = 0x0;
}
uint64_t kvmppc_xive_esb_rw(XiveSource *xsrc, int srcno, uint32_t offset,
uint64_t data, bool write)
{
if (write) {
return xive_esb_rw(xsrc, srcno, offset, data, 1);
}
/*
* Special Load EOI handling for LSI sources. Q bit is never set
* and the interrupt should be re-triggered if the level is still
* asserted.
*/
if (xive_source_irq_is_lsi(xsrc, srcno) &&
offset == XIVE_ESB_LOAD_EOI) {
xive_esb_read(xsrc, srcno, XIVE_ESB_SET_PQ_00);
if (xsrc->status[srcno] & XIVE_STATUS_ASSERTED) {
xive_esb_trigger(xsrc, srcno);
}
return 0;
} else {
return xive_esb_rw(xsrc, srcno, offset, 0, 0);
}
}
static void kvmppc_xive_source_get_state(XiveSource *xsrc)
{
int i;
for (i = 0; i < xsrc->nr_irqs; i++) {
/* Perform a load without side effect to retrieve the PQ bits */
uint8_t pq = xive_esb_read(xsrc, i, XIVE_ESB_GET);
/* and save PQ locally */
xive_source_esb_set(xsrc, i, pq);
}
}
void kvmppc_xive_source_set_irq(void *opaque, int srcno, int val)
{
XiveSource *xsrc = opaque;
SpaprXive *xive = SPAPR_XIVE(xsrc->xive);
struct kvm_irq_level args;
int rc;
/* The KVM XIVE device should be in use */
assert(xive->fd != -1);
args.irq = srcno;
if (!xive_source_irq_is_lsi(xsrc, srcno)) {
if (!val) {
return;
}
args.level = KVM_INTERRUPT_SET;
} else {
if (val) {
xsrc->status[srcno] |= XIVE_STATUS_ASSERTED;
args.level = KVM_INTERRUPT_SET_LEVEL;
} else {
xsrc->status[srcno] &= ~XIVE_STATUS_ASSERTED;
args.level = KVM_INTERRUPT_UNSET;
}
}
rc = kvm_vm_ioctl(kvm_state, KVM_IRQ_LINE, &args);
if (rc < 0) {
error_report("XIVE: kvm_irq_line() failed : %s", strerror(errno));
}
}
/*
* sPAPR XIVE interrupt controller (KVM)
*/
void kvmppc_xive_get_queue_config(SpaprXive *xive, uint8_t end_blk,
uint32_t end_idx, XiveEND *end,
Error **errp)
{
struct kvm_ppc_xive_eq kvm_eq = { 0 };
uint64_t kvm_eq_idx;
uint8_t priority;
uint32_t server;
Error *local_err = NULL;
assert(xive_end_is_valid(end));
/* Encode the tuple (server, prio) as a KVM EQ index */
spapr_xive_end_to_target(end_blk, end_idx, &server, &priority);
kvm_eq_idx = priority << KVM_XIVE_EQ_PRIORITY_SHIFT &
KVM_XIVE_EQ_PRIORITY_MASK;
kvm_eq_idx |= server << KVM_XIVE_EQ_SERVER_SHIFT &
KVM_XIVE_EQ_SERVER_MASK;
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
&kvm_eq, false, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
/*
* The EQ index and toggle bit are updated by HW. These are the
* only fields from KVM we want to update QEMU with. The other END
* fields should already be in the QEMU END table.
*/
end->w1 = xive_set_field32(END_W1_GENERATION, 0ul, kvm_eq.qtoggle) |
xive_set_field32(END_W1_PAGE_OFF, 0ul, kvm_eq.qindex);
}
void kvmppc_xive_set_queue_config(SpaprXive *xive, uint8_t end_blk,
uint32_t end_idx, XiveEND *end,
Error **errp)
{
struct kvm_ppc_xive_eq kvm_eq = { 0 };
uint64_t kvm_eq_idx;
uint8_t priority;
uint32_t server;
Error *local_err = NULL;
/*
* Build the KVM state from the local END structure.
*/
kvm_eq.flags = 0;
if (xive_get_field32(END_W0_UCOND_NOTIFY, end->w0)) {
kvm_eq.flags |= KVM_XIVE_EQ_ALWAYS_NOTIFY;
}
/*
* If the hcall is disabling the EQ, set the size and page address
* to zero. When migrating, only valid ENDs are taken into
* account.
*/
if (xive_end_is_valid(end)) {
kvm_eq.qshift = xive_get_field32(END_W0_QSIZE, end->w0) + 12;
kvm_eq.qaddr = xive_end_qaddr(end);
/*
* The EQ toggle bit and index should only be relevant when
* restoring the EQ state
*/
kvm_eq.qtoggle = xive_get_field32(END_W1_GENERATION, end->w1);
kvm_eq.qindex = xive_get_field32(END_W1_PAGE_OFF, end->w1);
} else {
kvm_eq.qshift = 0;
kvm_eq.qaddr = 0;
}
/* Encode the tuple (server, prio) as a KVM EQ index */
spapr_xive_end_to_target(end_blk, end_idx, &server, &priority);
kvm_eq_idx = priority << KVM_XIVE_EQ_PRIORITY_SHIFT &
KVM_XIVE_EQ_PRIORITY_MASK;
kvm_eq_idx |= server << KVM_XIVE_EQ_SERVER_SHIFT &
KVM_XIVE_EQ_SERVER_MASK;
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_EQ_CONFIG, kvm_eq_idx,
&kvm_eq, true, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
void kvmppc_xive_reset(SpaprXive *xive, Error **errp)
{
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL, KVM_DEV_XIVE_RESET,
NULL, true, errp);
}
static void kvmppc_xive_get_queues(SpaprXive *xive, Error **errp)
{
Error *local_err = NULL;
int i;
for (i = 0; i < xive->nr_ends; i++) {
if (!xive_end_is_valid(&xive->endt[i])) {
continue;
}
kvmppc_xive_get_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
&xive->endt[i], &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
}
}
/*
* The primary goal of the XIVE VM change handler is to mark the EQ
* pages dirty when all XIVE event notifications have stopped.
*
* Whenever the VM is stopped, the VM change handler sets the source
* PQs to PENDING to stop the flow of events and to possibly catch a
* triggered interrupt occuring while the VM is stopped. The previous
* state is saved in anticipation of a migration. The XIVE controller
* is then synced through KVM to flush any in-flight event
* notification and stabilize the EQs.
*
* At this stage, we can mark the EQ page dirty and let a migration
* sequence transfer the EQ pages to the destination, which is done
* just after the stop state.
*
* The previous configuration of the sources is restored when the VM
* runs again. If an interrupt was queued while the VM was stopped,
* simply generate a trigger.
*/
static void kvmppc_xive_change_state_handler(void *opaque, int running,
RunState state)
{
SpaprXive *xive = opaque;
XiveSource *xsrc = &xive->source;
Error *local_err = NULL;
int i;
/*
* Restore the sources to their initial state. This is called when
* the VM resumes after a stop or a migration.
*/
if (running) {
for (i = 0; i < xsrc->nr_irqs; i++) {
uint8_t pq = xive_source_esb_get(xsrc, i);
uint8_t old_pq;
old_pq = xive_esb_read(xsrc, i, XIVE_ESB_SET_PQ_00 + (pq << 8));
/*
* An interrupt was queued while the VM was stopped,
* generate a trigger.
*/
if (pq == XIVE_ESB_RESET && old_pq == XIVE_ESB_QUEUED) {
xive_esb_trigger(xsrc, i);
}
}
return;
}
/*
* Mask the sources, to stop the flow of event notifications, and
* save the PQs locally in the XiveSource object. The XiveSource
* state will be collected later on by its vmstate handler if a
* migration is in progress.
*/
for (i = 0; i < xsrc->nr_irqs; i++) {
uint8_t pq = xive_esb_read(xsrc, i, XIVE_ESB_GET);
/*
* PQ is set to PENDING to possibly catch a triggered
* interrupt occuring while the VM is stopped (hotplug event
* for instance) .
*/
if (pq != XIVE_ESB_OFF) {
pq = xive_esb_read(xsrc, i, XIVE_ESB_SET_PQ_10);
}
xive_source_esb_set(xsrc, i, pq);
}
/*
* Sync the XIVE controller in KVM, to flush in-flight event
* notification that should be enqueued in the EQs and mark the
* XIVE EQ pages dirty to collect all updates.
*/
kvm_device_access(xive->fd, KVM_DEV_XIVE_GRP_CTRL,
KVM_DEV_XIVE_EQ_SYNC, NULL, true, &local_err);
if (local_err) {
error_report_err(local_err);
return;
}
}
void kvmppc_xive_synchronize_state(SpaprXive *xive, Error **errp)
{
/* The KVM XIVE device is not in use */
if (xive->fd == -1) {
return;
}
/*
* When the VM is stopped, the sources are masked and the previous
* state is saved in anticipation of a migration. We should not
* synchronize the source state in that case else we will override
* the saved state.
*/
if (runstate_is_running()) {
kvmppc_xive_source_get_state(&xive->source);
}
/* EAT: there is no extra state to query from KVM */
/* ENDT */
kvmppc_xive_get_queues(xive, errp);
}
/*
* The SpaprXive 'pre_save' method is called by the vmstate handler of
* the SpaprXive model, after the XIVE controller is synced in the VM
* change handler.
*/
int kvmppc_xive_pre_save(SpaprXive *xive)
{
Error *local_err = NULL;
/* The KVM XIVE device is not in use */
if (xive->fd == -1) {
return 0;
}
/* EAT: there is no extra state to query from KVM */
/* ENDT */
kvmppc_xive_get_queues(xive, &local_err);
if (local_err) {
error_report_err(local_err);
return -1;
}
return 0;
}
/*
* The SpaprXive 'post_load' method is not called by a vmstate
* handler. It is called at the sPAPR machine level at the end of the
* migration sequence by the sPAPR IRQ backend 'post_load' method,
* when all XIVE states have been transferred and loaded.
*/
int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
{
Error *local_err = NULL;
CPUState *cs;
int i;
/* The KVM XIVE device should be in use */
assert(xive->fd != -1);
/* Restore the ENDT first. The targetting depends on it. */
for (i = 0; i < xive->nr_ends; i++) {
if (!xive_end_is_valid(&xive->endt[i])) {
continue;
}
kvmppc_xive_set_queue_config(xive, SPAPR_XIVE_BLOCK_ID, i,
&xive->endt[i], &local_err);
if (local_err) {
error_report_err(local_err);
return -1;
}
}
/* Restore the EAT */
for (i = 0; i < xive->nr_irqs; i++) {
if (!xive_eas_is_valid(&xive->eat[i])) {
continue;
}
kvmppc_xive_set_source_config(xive, i, &xive->eat[i], &local_err);
if (local_err) {
error_report_err(local_err);
return -1;
}
}
/*
* Restore the thread interrupt contexts of initial CPUs.
*
* The context of hotplugged CPUs is restored later, by the
* 'post_load' handler of the XiveTCTX model because they are not
* available at the time the SpaprXive 'post_load' method is
* called. We can not restore the context of all CPUs in the
* 'post_load' handler of XiveTCTX because the machine is not
* necessarily connected to the KVM device at that time.
*/
CPU_FOREACH(cs) {
PowerPCCPU *cpu = POWERPC_CPU(cs);
kvmppc_xive_cpu_set_state(spapr_cpu_state(cpu)->tctx, &local_err);
if (local_err) {
error_report_err(local_err);
return -1;
}
}
/* The source states will be restored when the machine starts running */
return 0;
}
static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len,
Error **errp)
{
void *addr;
uint32_t page_shift = 16; /* TODO: fix page_shift */
addr = mmap(NULL, len, PROT_WRITE | PROT_READ, MAP_SHARED, xive->fd,
pgoff << page_shift);
if (addr == MAP_FAILED) {
error_setg_errno(errp, errno, "XIVE: unable to set memory mapping");
return NULL;
}
return addr;
}
/*
* All the XIVE memory regions are now backed by mappings from the KVM
* XIVE device.
*/
void kvmppc_xive_connect(SpaprXive *xive, Error **errp)
{
XiveSource *xsrc = &xive->source;
Error *local_err = NULL;
size_t esb_len = (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
size_t tima_len = 4ull << TM_SHIFT;
CPUState *cs;
/*
* The KVM XIVE device already in use. This is the case when
* rebooting under the XIVE-only interrupt mode.
*/
if (xive->fd != -1) {
return;
}
if (!kvmppc_has_cap_xive()) {
error_setg(errp, "IRQ_XIVE capability must be present for KVM");
return;
}
/* First, create the KVM XIVE device */
xive->fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
if (xive->fd < 0) {
error_setg_errno(errp, -xive->fd, "XIVE: error creating KVM device");
return;
}
/*
* 1. Source ESB pages - KVM mapping
*/
xsrc->esb_mmap = kvmppc_xive_mmap(xive, KVM_XIVE_ESB_PAGE_OFFSET, esb_len,
&local_err);
if (local_err) {
goto fail;
}
memory_region_init_ram_device_ptr(&xsrc->esb_mmio_kvm, OBJECT(xsrc),
"xive.esb", esb_len, xsrc->esb_mmap);
memory_region_add_subregion_overlap(&xsrc->esb_mmio, 0,
&xsrc->esb_mmio_kvm, 1);
/*
* 2. END ESB pages (No KVM support yet)
*/
/*
* 3. TIMA pages - KVM mapping
*/
xive->tm_mmap = kvmppc_xive_mmap(xive, KVM_XIVE_TIMA_PAGE_OFFSET, tima_len,
&local_err);
if (local_err) {
goto fail;
}
memory_region_init_ram_device_ptr(&xive->tm_mmio_kvm, OBJECT(xive),
"xive.tima", tima_len, xive->tm_mmap);
memory_region_add_subregion_overlap(&xive->tm_mmio, 0,
&xive->tm_mmio_kvm, 1);
xive->change = qemu_add_vm_change_state_handler(
kvmppc_xive_change_state_handler, xive);
/* Connect the presenters to the initial VCPUs of the machine */
CPU_FOREACH(cs) {
PowerPCCPU *cpu = POWERPC_CPU(cs);
kvmppc_xive_cpu_connect(spapr_cpu_state(cpu)->tctx, &local_err);
if (local_err) {
goto fail;
}
}
/* Update the KVM sources */
kvmppc_xive_source_reset(xsrc, &local_err);
if (local_err) {
goto fail;
}
kvm_kernel_irqchip = true;
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_direct_mapping = true;
return;
fail:
error_propagate(errp, local_err);
kvmppc_xive_disconnect(xive, NULL);
}
void kvmppc_xive_disconnect(SpaprXive *xive, Error **errp)
{
XiveSource *xsrc;
size_t esb_len;
/* The KVM XIVE device is not in use */
if (!xive || xive->fd == -1) {
return;
}
if (!kvmppc_has_cap_xive()) {
error_setg(errp, "IRQ_XIVE capability must be present for KVM");
return;
}
/* Clear the KVM mapping */
xsrc = &xive->source;
esb_len = (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
if (xsrc->esb_mmap) {
memory_region_del_subregion(&xsrc->esb_mmio, &xsrc->esb_mmio_kvm);
object_unparent(OBJECT(&xsrc->esb_mmio_kvm));
munmap(xsrc->esb_mmap, esb_len);
xsrc->esb_mmap = NULL;
}
if (xive->tm_mmap) {
memory_region_del_subregion(&xive->tm_mmio, &xive->tm_mmio_kvm);
object_unparent(OBJECT(&xive->tm_mmio_kvm));
munmap(xive->tm_mmap, 4ull << TM_SHIFT);
xive->tm_mmap = NULL;
}
/*
* When the KVM device fd is closed, the KVM device is destroyed
* and removed from the list of devices of the VM. The VCPU
* presenters are also detached from the device.
*/
if (xive->fd != -1) {
close(xive->fd);
xive->fd = -1;
}
kvm_kernel_irqchip = false;
kvm_msi_via_irqfd_allowed = false;
kvm_gsi_direct_mapping = false;
/* Clear the local list of presenter (hotplug) */
kvm_cpu_disable_all();
/* VM Change state handler is not needed anymore */
if (xive->change) {
qemu_del_vm_change_state_handler(xive->change);
xive->change = NULL;
}
}
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