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Assorted s390x patches:

Browse source 
- updates for virtio-ccw and s390-virtio, making them more similar
   to virtio-pci
 - improvements regarding per-vcpu interrupts and migration
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Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20150508' into staging

Assorted s390x patches:
- updates for virtio-ccw and s390-virtio, making them more similar
  to virtio-pci
- improvements regarding per-vcpu interrupts and migration

# gpg: Signature made Fri May  8 09:45:09 2015 BST using RSA key ID C6F02FAF
# gpg: Good signature from "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"

* remotes/cohuck/tags/s390x-20150508:
  s390x/kvm: migrate vcpu interrupt state
  s390x: move fpu regs into a subsection of the vmstate
  s390x/kvm: use ioctl KVM_S390_IRQ for vcpu interrupts
  virtio-ccw: implement ->device_plugged
  virtio-ccw: change realization sequence
  s390-virtio: clear {used,avail}_event_idx on reset as well
  s390-virtio: use common features
  s390-virtio: Accommodate guests using virtqueues too early

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-05-10 21:40:54 +01:00
parent f8340b360b 3cda44f7ba
commit fc85cf4a81
8 changed files with 192 additions and 57 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
hw/s390x/s390-virtio-bus.c
View file

@ -77,10 +77,18 @@ void s390_virtio_reset_idx(VirtIOS390Device *dev)
VIRTIO_VRING_AVAIL_IDX_OFFS;
address_space_stw(&address_space_memory, idx_addr, 0,
MEMTXATTRS_UNSPECIFIED, NULL);
idx_addr = virtio_queue_get_avail_addr(dev->vdev, i) +
virtio_queue_get_avail_size(dev->vdev, i);
address_space_stw(&address_space_memory, idx_addr, 0,
MEMTXATTRS_UNSPECIFIED, NULL);
idx_addr = virtio_queue_get_used_addr(dev->vdev, i) +
VIRTIO_VRING_USED_IDX_OFFS;
address_space_stw(&address_space_memory, idx_addr, 0,
MEMTXATTRS_UNSPECIFIED, NULL);
idx_addr = virtio_queue_get_used_addr(dev->vdev, i) +
virtio_queue_get_used_size(dev->vdev, i);
address_space_stw(&address_space_memory, idx_addr, 0,
MEMTXATTRS_UNSPECIFIED, NULL);
}
}
@ -530,7 +538,6 @@ static unsigned virtio_s390_get_features(DeviceState *d)
/**************** S390 Virtio Bus Device Descriptions *******************/
static Property s390_virtio_net_properties[] = {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
DEFINE_VIRTIO_NET_FEATURES(VirtIOS390Device, host_features),
DEFINE_PROP_END_OF_LIST(),
};
@ -592,18 +599,12 @@ static const TypeInfo s390_virtio_serial = {
.class_init = s390_virtio_serial_class_init,
};
static Property s390_virtio_rng_properties[] = {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
DEFINE_PROP_END_OF_LIST(),
};
static void s390_virtio_rng_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
k->realize = s390_virtio_rng_realize;
dc->props = s390_virtio_rng_properties;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}
@ -632,10 +633,16 @@ static void s390_virtio_busdev_reset(DeviceState *dev)
virtio_reset(_dev->vdev);
}
static Property virtio_s390_properties[] = {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_s390_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = virtio_s390_properties;
dc->realize = s390_virtio_busdev_realize;
dc->bus_type = TYPE_S390_VIRTIO_BUS;
dc->reset = s390_virtio_busdev_reset;
@ -651,7 +658,6 @@ static const TypeInfo virtio_s390_device_info = {
};
static Property s390_virtio_scsi_properties[] = {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
DEFINE_VIRTIO_SCSI_FEATURES(VirtIOS390Device, host_features),
DEFINE_PROP_END_OF_LIST(),
};
@ -675,18 +681,12 @@ static const TypeInfo s390_virtio_scsi = {
};
#ifdef CONFIG_VHOST_SCSI
static Property s390_vhost_scsi_properties[] = {
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOS390Device, host_features),
DEFINE_PROP_END_OF_LIST(),
};
static void s390_vhost_scsi_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
k->realize = s390_vhost_scsi_realize;
dc->props = s390_vhost_scsi_properties;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
}

10
hw/s390x/s390-virtio.c
View file

@ -77,6 +77,16 @@ static int s390_virtio_hcall_notify(const uint64_t *args)
if (mem > ram_size) {
VirtIOS390Device *dev = s390_virtio_bus_find_vring(s390_bus, mem, &i);
if (dev) {
/*
* Older kernels will use the virtqueue before setting DRIVER_OK.
* In this case the feature bits are not yet up to date, meaning
* that several funny things can happen, e.g. the guest thinks
* EVENT_IDX is on and QEMU thinks it is off. Let's force a feature
* and status sync.
*/
if (!(dev->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
s390_virtio_device_update_status(dev);
}
virtio_queue_notify(dev->vdev, i);
} else {
r = -EINVAL;

72
hw/s390x/virtio-ccw.c
View file

@ -642,8 +642,7 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
return ret;
}
static void virtio_ccw_device_realize(VirtioCcwDevice *dev,
VirtIODevice *vdev, Error **errp)
static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp)
{
unsigned int cssid = 0;
unsigned int ssid = 0;
@ -653,7 +652,8 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev,
bool found = false;
SubchDev *sch;
int num;
DeviceState *parent = DEVICE(dev);
Error *err = NULL;
VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
sch = g_malloc0(sizeof(SubchDev));
@ -766,17 +766,16 @@ static void virtio_ccw_device_realize(VirtioCcwDevice *dev,
memset(&sch->id, 0, sizeof(SenseId));
sch->id.reserved = 0xff;
sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
sch->id.cu_model = vdev->device_id;
/* Only the first 32 feature bits are used. */
dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
dev->host_features[0]);
if (k->realize) {
k->realize(dev, &err);
}
if (err) {
error_propagate(errp, err);
css_subch_assign(cssid, ssid, schid, devno, NULL);
goto out_err;
}
virtio_add_feature(&dev->host_features[0], VIRTIO_F_NOTIFY_ON_EMPTY);
virtio_add_feature(&dev->host_features[0], VIRTIO_F_BAD_FEATURE);
css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
parent->hotplugged, 1);
return;
out_err:
@ -813,10 +812,7 @@ static void virtio_ccw_net_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_bool(OBJECT(vdev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
return;
}
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
static void virtio_ccw_net_instance_init(Object *obj)
@ -839,10 +835,7 @@ static void virtio_ccw_blk_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_bool(OBJECT(vdev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
return;
}
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
static void virtio_ccw_blk_instance_init(Object *obj)
@ -879,10 +872,7 @@ static void virtio_ccw_serial_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_bool(OBJECT(vdev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
return;
}
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
@ -904,10 +894,7 @@ static void virtio_ccw_balloon_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_bool(OBJECT(vdev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
return;
}
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
static void balloon_ccw_stats_get_all(Object *obj, struct Visitor *v,
@ -972,10 +959,7 @@ static void virtio_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_bool(OBJECT(vdev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
return;
}
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
static void virtio_ccw_scsi_instance_init(Object *obj)
@ -999,10 +983,7 @@ static void vhost_ccw_scsi_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_bool(OBJECT(vdev), true, "realized", &err);
if (err) {
error_propagate(errp, err);
return;
}
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
static void vhost_ccw_scsi_instance_init(Object *obj)
@ -1030,8 +1011,6 @@ static void virtio_ccw_rng_realize(VirtioCcwDevice *ccw_dev, Error **errp)
object_property_set_link(OBJECT(dev),
OBJECT(dev->vdev.conf.rng), "rng",
NULL);
virtio_ccw_device_realize(ccw_dev, VIRTIO_DEVICE(vdev), errp);
}
/* DeviceState to VirtioCcwDevice. Note: used on datapath,
@ -1434,6 +1413,30 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
return 0;
}
/* This is called by virtio-bus just after the device is plugged. */
static void virtio_ccw_device_plugged(DeviceState *d)
{
VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
SubchDev *sch = dev->sch;
sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus);
/* Only the first 32 feature bits are used. */
virtio_add_feature(&dev->host_features[0], VIRTIO_F_NOTIFY_ON_EMPTY);
virtio_add_feature(&dev->host_features[0], VIRTIO_F_BAD_FEATURE);
dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
dev->host_features[0]);
css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
d->hotplugged, 1);
}
static void virtio_ccw_device_unplugged(DeviceState *d)
{
VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
virtio_ccw_stop_ioeventfd(dev);
}
/**************** Virtio-ccw Bus Device Descriptions *******************/
static Property virtio_ccw_net_properties[] = {
@ -1640,10 +1643,9 @@ static const TypeInfo virtio_ccw_rng = {
static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp)
{
VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
_info->realize(_dev, errp);
virtio_ccw_device_realize(_dev, errp);
}
static int virtio_ccw_busdev_exit(DeviceState *dev)
@ -1759,6 +1761,8 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
k->load_queue = virtio_ccw_load_queue;
k->save_config = virtio_ccw_save_config;
k->load_config = virtio_ccw_load_config;
k->device_plugged = virtio_ccw_device_plugged;
k->device_unplugged = virtio_ccw_device_unplugged;
}
static const TypeInfo virtio_ccw_bus_info = {

3
target-s390x/cpu-qom.h
View file

@ -66,6 +66,9 @@ typedef struct S390CPU {
/*< public >*/
CPUS390XState env;
/* needed for live migration */
void *irqstate;
uint32_t irqstate_saved_size;
} S390CPU;
static inline S390CPU *s390_env_get_cpu(CPUS390XState *env)

1
target-s390x/cpu.c
View file

@ -213,6 +213,7 @@ static void s390_cpu_finalize(Object *obj)
S390CPU *cpu = S390_CPU(obj);
qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
g_free(cpu->irqstate);
#endif
}

9
target-s390x/cpu.h
View file

@ -1079,6 +1079,8 @@ void kvm_s390_clear_cmma_callback(void *opaque);
int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t cpu_state);
void kvm_s390_reset_vcpu(S390CPU *cpu);
int kvm_s390_set_mem_limit(KVMState *s, uint64_t new_limit, uint64_t *hw_limit);
void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu);
int kvm_s390_vcpu_interrupt_post_load(S390CPU *cpu);
#else
static inline void kvm_s390_io_interrupt(uint16_t subchannel_id,
uint16_t subchannel_nr,
@ -1121,6 +1123,13 @@ static inline int kvm_s390_set_mem_limit(KVMState *s, uint64_t new_limit,
{
return 0;
}
static inline void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
{
}
static inline int kvm_s390_vcpu_interrupt_post_load(S390CPU *cpu)
{
return 0;
}
#endif
static inline int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)

77
target-s390x/kvm.c
View file

@ -109,6 +109,14 @@
#define ICPT_CPU_STOP 0x28
#define ICPT_IO 0x40
#define NR_LOCAL_IRQS 32
/*
* Needs to be big enough to contain max_cpus emergency signals
* and in addition NR_LOCAL_IRQS interrupts
*/
#define VCPU_IRQ_BUF_SIZE (sizeof(struct kvm_s390_irq) * \
(max_cpus + NR_LOCAL_IRQS))
static CPUWatchpoint hw_watchpoint;
/*
* We don't use a list because this structure is also used to transmit the
@ -124,6 +132,7 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
static int cap_sync_regs;
static int cap_async_pf;
static int cap_mem_op;
static int cap_s390_irq;
static void *legacy_s390_alloc(size_t size, uint64_t *align);
@ -249,6 +258,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
cap_mem_op = kvm_check_extension(s, KVM_CAP_S390_MEM_OP);
cap_s390_irq = kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ);
kvm_s390_enable_cmma(s);
@ -272,6 +282,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
{
S390CPU *cpu = S390_CPU(cs);
kvm_s390_set_cpu_state(cpu, cpu->env.cpu_state);
cpu->irqstate = g_malloc0(VCPU_IRQ_BUF_SIZE);
return 0;
}
@ -827,10 +838,9 @@ static int s390_kvm_irq_to_interrupt(struct kvm_s390_irq *irq,
return r;
}
void kvm_s390_vcpu_interrupt(S390CPU *cpu, struct kvm_s390_irq *irq)
static void inject_vcpu_irq_legacy(CPUState *cs, struct kvm_s390_irq *irq)
{
struct kvm_s390_interrupt kvmint = {};
CPUState *cs = CPU(cpu);
int r;
r = s390_kvm_irq_to_interrupt(irq, &kvmint);
@ -846,6 +856,23 @@ void kvm_s390_vcpu_interrupt(S390CPU *cpu, struct kvm_s390_irq *irq)
}
}
void kvm_s390_vcpu_interrupt(S390CPU *cpu, struct kvm_s390_irq *irq)
{
CPUState *cs = CPU(cpu);
int r;
if (cap_s390_irq) {
r = kvm_vcpu_ioctl(cs, KVM_S390_IRQ, irq);
if (!r) {
return;
}
error_report("KVM failed to inject interrupt %llx", irq->type);
exit(1);
}
inject_vcpu_irq_legacy(cs, irq);
}
static void __kvm_s390_floating_interrupt(struct kvm_s390_irq *irq)
{
struct kvm_s390_interrupt kvmint = {};
@ -2041,6 +2068,52 @@ int kvm_s390_set_cpu_state(S390CPU *cpu, uint8_t cpu_state)
return ret;
}
void kvm_s390_vcpu_interrupt_pre_save(S390CPU *cpu)
{
struct kvm_s390_irq_state irq_state;
CPUState *cs = CPU(cpu);
int32_t bytes;
if (!kvm_check_extension(kvm_state, KVM_CAP_S390_IRQ_STATE)) {
return;
}
irq_state.buf = (uint64_t) cpu->irqstate;
irq_state.len = VCPU_IRQ_BUF_SIZE;
bytes = kvm_vcpu_ioctl(cs, KVM_S390_GET_IRQ_STATE, &irq_state);
if (bytes < 0) {
cpu->irqstate_saved_size = 0;
error_report("Migration of interrupt state failed");
return;
}
cpu->irqstate_saved_size = bytes;
}
int kvm_s390_vcpu_interrupt_post_load(S390CPU *cpu)
{
CPUState *cs = CPU(cpu);
struct kvm_s390_irq_state irq_state;
int r;
if (!kvm_check_extension(kvm_state, KVM_CAP_S390_IRQ_STATE)) {
return -ENOSYS;
}
if (cpu->irqstate_saved_size == 0) {
return 0;
}
irq_state.buf = (uint64_t) cpu->irqstate;
irq_state.len = cpu->irqstate_saved_size;
r = kvm_vcpu_ioctl(cs, KVM_S390_SET_IRQ_STATE, &irq_state);
if (r) {
error_report("Setting interrupt state failed %d", r);
}
return r;
}
int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
uint64_t address, uint32_t data)
{

49
target-s390x/machine.c
View file

@ -28,17 +28,25 @@ static int cpu_post_load(void *opaque, int version_id)
*/
if (kvm_enabled()) {
kvm_s390_set_cpu_state(cpu, cpu->env.cpu_state);
return kvm_s390_vcpu_interrupt_post_load(cpu);
}
return 0;
}
static void cpu_pre_save(void *opaque)
{
S390CPU *cpu = opaque;
const VMStateDescription vmstate_s390_cpu = {
.name = "cpu",
.post_load = cpu_post_load,
.version_id = 2,
.minimum_version_id = 2,
.fields = (VMStateField[]) {
if (kvm_enabled()) {
kvm_s390_vcpu_interrupt_pre_save(cpu);
}
}
const VMStateDescription vmstate_fpu = {
.name = "cpu/fpu",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.fregs[0].ll, S390CPU),
VMSTATE_UINT64(env.fregs[1].ll, S390CPU),
VMSTATE_UINT64(env.fregs[2].ll, S390CPU),
@ -55,11 +63,27 @@ const VMStateDescription vmstate_s390_cpu = {
VMSTATE_UINT64(env.fregs[13].ll, S390CPU),
VMSTATE_UINT64(env.fregs[14].ll, S390CPU),
VMSTATE_UINT64(env.fregs[15].ll, S390CPU),
VMSTATE_UINT32(env.fpc, S390CPU),
VMSTATE_END_OF_LIST()
}
};
static inline bool fpu_needed(void *opaque)
{
return true;
}
const VMStateDescription vmstate_s390_cpu = {
.name = "cpu",
.post_load = cpu_post_load,
.pre_save = cpu_pre_save,
.version_id = 4,
.minimum_version_id = 3,
.fields = (VMStateField[]) {
VMSTATE_UINT64_ARRAY(env.regs, S390CPU, 16),
VMSTATE_UINT64(env.psw.mask, S390CPU),
VMSTATE_UINT64(env.psw.addr, S390CPU),
VMSTATE_UINT64(env.psa, S390CPU),
VMSTATE_UINT32(env.fpc, S390CPU),
VMSTATE_UINT32(env.todpr, S390CPU),
VMSTATE_UINT64(env.pfault_token, S390CPU),
VMSTATE_UINT64(env.pfault_compare, S390CPU),
@ -72,6 +96,17 @@ const VMStateDescription vmstate_s390_cpu = {
VMSTATE_UINT64_ARRAY(env.cregs, S390CPU, 16),
VMSTATE_UINT8(env.cpu_state, S390CPU),
VMSTATE_UINT8(env.sigp_order, S390CPU),
VMSTATE_UINT32_V(irqstate_saved_size, S390CPU, 4),
VMSTATE_VBUFFER_UINT32(irqstate, S390CPU, 4, NULL, 0,
irqstate_saved_size),
VMSTATE_END_OF_LIST()
},
.subsections = (VMStateSubsection[]) {
{
.vmsd = &vmstate_fpu,
.needed = fpu_needed,
} , {
/* empty */
}
},
};