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-rw-r--r--hw/i386/kvm/trace-events4
-rw-r--r--hw/i386/kvm/trace.h1
-rw-r--r--hw/i386/kvm/xen_evtchn.c306
-rw-r--r--hw/i386/kvm/xen_evtchn.h2
4 files changed, 308 insertions, 5 deletions
diff --git a/hw/i386/kvm/trace-events b/hw/i386/kvm/trace-events
new file mode 100644
index 0000000..04e60c5
--- /dev/null
+++ b/hw/i386/kvm/trace-events
@@ -0,0 +1,4 @@
+kvm_xen_map_pirq(int pirq, int gsi) "pirq %d gsi %d"
+kvm_xen_unmap_pirq(int pirq, int gsi) "pirq %d gsi %d"
+kvm_xen_get_free_pirq(int pirq, int type) "pirq %d type %d"
+kvm_xen_bind_pirq(int pirq, int port) "pirq %d port %d"
diff --git a/hw/i386/kvm/trace.h b/hw/i386/kvm/trace.h
new file mode 100644
index 0000000..e55d081
--- /dev/null
+++ b/hw/i386/kvm/trace.h
@@ -0,0 +1 @@
+#include "trace/trace-hw_i386_kvm.h"
diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index b95ee9b..59eea63 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -24,6 +24,7 @@
#include "exec/target_page.h"
#include "exec/address-spaces.h"
#include "migration/vmstate.h"
+#include "trace.h"
#include "hw/sysbus.h"
#include "hw/xen/xen.h"
@@ -105,6 +106,21 @@ struct xenevtchn_handle {
#define PORT_INFO_TYPEVAL_REMOTE_QEMU 0x8000
#define PORT_INFO_TYPEVAL_REMOTE_PORT_MASK 0x7FFF
+/*
+ * These 'emuirq' values are used by Xen in the LM stream... and yes, I am
+ * insane enough to think about guest-transparent live migration from actual
+ * Xen to QEMU, and ensuring that we can convert/consume the stream.
+ */
+#define IRQ_UNBOUND -1
+#define IRQ_PT -2
+#define IRQ_MSI_EMU -3
+
+
+struct pirq_info {
+ int gsi;
+ uint16_t port;
+};
+
struct XenEvtchnState {
/*< private >*/
SysBusDevice busdev;
@@ -122,8 +138,25 @@ struct XenEvtchnState {
qemu_irq gsis[IOAPIC_NUM_PINS];
struct xenevtchn_handle *be_handles[EVTCHN_2L_NR_CHANNELS];
+
+ uint32_t nr_pirqs;
+
+ /* Bitmap of allocated PIRQs (serialized) */
+ uint16_t nr_pirq_inuse_words;
+ uint64_t *pirq_inuse_bitmap;
+
+ /* GSI → PIRQ mapping (serialized) */
+ uint16_t gsi_pirq[IOAPIC_NUM_PINS];
+
+ /* Per-PIRQ information (rebuilt on migration) */
+ struct pirq_info *pirq;
};
+#define pirq_inuse_word(s, pirq) (s->pirq_inuse_bitmap[((pirq) / 64)])
+#define pirq_inuse_bit(pirq) (1ULL << ((pirq) & 63))
+
+#define pirq_inuse(s, pirq) (pirq_inuse_word(s, pirq) & pirq_inuse_bit(pirq))
+
struct XenEvtchnState *xen_evtchn_singleton;
/* Top bits of callback_param are the type (HVM_PARAM_CALLBACK_TYPE_xxx) */
@@ -138,17 +171,45 @@ static int xen_evtchn_pre_load(void *opaque)
/* Unbind all the backend-side ports; they need to rebind */
unbind_backend_ports(s);
+ /* It'll be leaked otherwise. */
+ g_free(s->pirq_inuse_bitmap);
+ s->pirq_inuse_bitmap = NULL;
+
return 0;
}
static int xen_evtchn_post_load(void *opaque, int version_id)
{
XenEvtchnState *s = opaque;
+ uint32_t i;
if (s->callback_param) {
xen_evtchn_set_callback_param(s->callback_param);
}
+ /* Rebuild s->pirq[].port mapping */
+ for (i = 0; i < s->nr_ports; i++) {
+ XenEvtchnPort *p = &s->port_table[i];
+
+ if (p->type == EVTCHNSTAT_pirq) {
+ assert(p->type_val);
+ assert(p->type_val < s->nr_pirqs);
+
+ /*
+ * Set the gsi to IRQ_UNBOUND; it may be changed to an actual
+ * GSI# below, or to IRQ_MSI_EMU when the MSI table snooping
+ * catches up with it.
+ */
+ s->pirq[p->type_val].gsi = IRQ_UNBOUND;
+ s->pirq[p->type_val].port = i;
+ }
+ }
+ /* Rebuild s->pirq[].gsi mapping */
+ for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+ if (s->gsi_pirq[i]) {
+ s->pirq[s->gsi_pirq[i]].gsi = i;
+ }
+ }
return 0;
}
@@ -181,6 +242,10 @@ static const VMStateDescription xen_evtchn_vmstate = {
VMSTATE_UINT32(nr_ports, XenEvtchnState),
VMSTATE_STRUCT_VARRAY_UINT32(port_table, XenEvtchnState, nr_ports, 1,
xen_evtchn_port_vmstate, XenEvtchnPort),
+ VMSTATE_UINT16_ARRAY(gsi_pirq, XenEvtchnState, IOAPIC_NUM_PINS),
+ VMSTATE_VARRAY_UINT16_ALLOC(pirq_inuse_bitmap, XenEvtchnState,
+ nr_pirq_inuse_words, 0,
+ vmstate_info_uint64, uint64_t),
VMSTATE_END_OF_LIST()
}
};
@@ -221,6 +286,23 @@ void xen_evtchn_create(void)
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->gsis[i]);
}
+
+ /*
+ * We could parameterise the number of PIRQs available if needed,
+ * but for now limit it to 256. The Xen scheme for encoding PIRQ#
+ * into an MSI message is not compatible with 32-bit MSI, as it
+ * puts the high bits of the PIRQ# into the high bits of the MSI
+ * message address, instead of using the Extended Destination ID
+ * in address bits 4-11 which perhaps would have been a better
+ * choice. So to keep life simple, just stick with 256 as the
+ * default, which conveniently doesn't need to set anything
+ * outside the low 32 bits of the address.
+ */
+ s->nr_pirqs = 256;
+
+ s->nr_pirq_inuse_words = DIV_ROUND_UP(s->nr_pirqs, 64);
+ s->pirq_inuse_bitmap = g_new0(uint64_t, s->nr_pirq_inuse_words);
+ s->pirq = g_new0(struct pirq_info, s->nr_pirqs);
}
void xen_evtchn_connect_gsis(qemu_irq *system_gsis)
@@ -929,6 +1011,10 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port)
case EVTCHNSTAT_closed:
return -ENOENT;
+ case EVTCHNSTAT_pirq:
+ s->pirq[p->type_val].port = 0;
+ break;
+
case EVTCHNSTAT_virq:
kvm_xen_set_vcpu_virq(virq_is_global(p->type_val) ? 0 : p->vcpu,
p->type_val, 0);
@@ -1123,6 +1209,37 @@ int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq)
return ret;
}
+int xen_evtchn_bind_pirq_op(struct evtchn_bind_pirq *pirq)
+{
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int ret;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ if (pirq->pirq >= s->nr_pirqs) {
+ return -EINVAL;
+ }
+
+ QEMU_LOCK_GUARD(&s->port_lock);
+
+ if (s->pirq[pirq->pirq].port) {
+ return -EBUSY;
+ }
+
+ ret = allocate_port(s, 0, EVTCHNSTAT_pirq, pirq->pirq,
+ &pirq->port);
+ if (ret) {
+ return ret;
+ }
+
+ s->pirq[pirq->pirq].port = pirq->port;
+ trace_kvm_xen_bind_pirq(pirq->pirq, pirq->port);
+
+ return ret;
+}
+
int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
{
XenEvtchnState *s = xen_evtchn_singleton;
@@ -1349,29 +1466,208 @@ int xen_evtchn_set_port(uint16_t port)
return ret;
}
+static int allocate_pirq(XenEvtchnState *s, int type, int gsi)
+{
+ uint16_t pirq;
+
+ /*
+ * Preserve the allocation strategy that Xen has. It looks like
+ * we *never* give out PIRQ 0-15, we give out 16-nr_irqs_gsi only
+ * to GSIs (counting up from 16), and then we count backwards from
+ * the top for MSIs or when the GSI space is exhausted.
+ */
+ if (type == MAP_PIRQ_TYPE_GSI) {
+ for (pirq = 16 ; pirq < IOAPIC_NUM_PINS; pirq++) {
+ if (pirq_inuse(s, pirq)) {
+ continue;
+ }
+
+ /* Found it */
+ goto found;
+ }
+ }
+ for (pirq = s->nr_pirqs - 1; pirq >= IOAPIC_NUM_PINS; pirq--) {
+ /* Skip whole words at a time when they're full */
+ if (pirq_inuse_word(s, pirq) == UINT64_MAX) {
+ pirq &= ~63ULL;
+ continue;
+ }
+ if (pirq_inuse(s, pirq)) {
+ continue;
+ }
+
+ goto found;
+ }
+ return -ENOSPC;
+
+ found:
+ pirq_inuse_word(s, pirq) |= pirq_inuse_bit(pirq);
+ if (gsi >= 0) {
+ assert(gsi <= IOAPIC_NUM_PINS);
+ s->gsi_pirq[gsi] = pirq;
+ }
+ s->pirq[pirq].gsi = gsi;
+ return pirq;
+}
+
int xen_physdev_map_pirq(struct physdev_map_pirq *map)
{
- return -ENOTSUP;
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int pirq = map->pirq;
+ int gsi = map->index;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ QEMU_LOCK_GUARD(&s->port_lock);
+
+ if (map->domid != DOMID_SELF && map->domid != xen_domid) {
+ return -EPERM;
+ }
+ if (map->type != MAP_PIRQ_TYPE_GSI) {
+ return -EINVAL;
+ }
+ if (gsi < 0 || gsi >= IOAPIC_NUM_PINS) {
+ return -EINVAL;
+ }
+
+ if (pirq < 0) {
+ pirq = allocate_pirq(s, map->type, gsi);
+ if (pirq < 0) {
+ return pirq;
+ }
+ map->pirq = pirq;
+ } else if (pirq > s->nr_pirqs) {
+ return -EINVAL;
+ } else {
+ /*
+ * User specified a valid-looking PIRQ#. Allow it if it is
+ * allocated and not yet bound, or if it is unallocated
+ */
+ if (pirq_inuse(s, pirq)) {
+ if (s->pirq[pirq].gsi != IRQ_UNBOUND) {
+ return -EBUSY;
+ }
+ } else {
+ /* If it was unused, mark it used now. */
+ pirq_inuse_word(s, pirq) |= pirq_inuse_bit(pirq);
+ }
+ /* Set the mapping in both directions. */
+ s->pirq[pirq].gsi = gsi;
+ s->gsi_pirq[gsi] = pirq;
+ }
+
+ trace_kvm_xen_map_pirq(pirq, gsi);
+ return 0;
}
int xen_physdev_unmap_pirq(struct physdev_unmap_pirq *unmap)
{
- return -ENOTSUP;
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int pirq = unmap->pirq;
+ int gsi;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ if (unmap->domid != DOMID_SELF && unmap->domid != xen_domid) {
+ return -EPERM;
+ }
+ if (pirq < 0 || pirq >= s->nr_pirqs) {
+ return -EINVAL;
+ }
+
+ QEMU_LOCK_GUARD(&s->port_lock);
+
+ if (!pirq_inuse(s, pirq)) {
+ return -ENOENT;
+ }
+
+ gsi = s->pirq[pirq].gsi;
+
+ /* We can only unmap GSI PIRQs */
+ if (gsi < 0) {
+ return -EINVAL;
+ }
+
+ s->gsi_pirq[gsi] = 0;
+ s->pirq[pirq].gsi = IRQ_UNBOUND; /* Doesn't actually matter because: */
+ pirq_inuse_word(s, pirq) &= ~pirq_inuse_bit(pirq);
+
+ trace_kvm_xen_unmap_pirq(pirq, gsi);
+ return 0;
}
int xen_physdev_eoi_pirq(struct physdev_eoi *eoi)
{
- return -ENOTSUP;
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int pirq = eoi->irq;
+ int gsi;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ QEMU_LOCK_GUARD(&s->port_lock);
+
+ if (!pirq_inuse(s, pirq)) {
+ return -ENOENT;
+ }
+
+ gsi = s->pirq[pirq].gsi;
+ if (gsi < 0) {
+ return -EINVAL;
+ }
+
+ /* XX: Reassert a level IRQ if needed */
+ return 0;
}
int xen_physdev_query_pirq(struct physdev_irq_status_query *query)
{
- return -ENOTSUP;
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int pirq = query->irq;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ QEMU_LOCK_GUARD(&s->port_lock);
+
+ if (!pirq_inuse(s, pirq)) {
+ return -ENOENT;
+ }
+
+ if (s->pirq[pirq].gsi >= 0) {
+ query->flags = XENIRQSTAT_needs_eoi;
+ } else {
+ query->flags = 0;
+ }
+
+ return 0;
}
int xen_physdev_get_free_pirq(struct physdev_get_free_pirq *get)
{
- return -ENOTSUP;
+ XenEvtchnState *s = xen_evtchn_singleton;
+ int pirq;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ QEMU_LOCK_GUARD(&s->port_lock);
+
+ pirq = allocate_pirq(s, get->type, IRQ_UNBOUND);
+ if (pirq < 0) {
+ return pirq;
+ }
+
+ get->pirq = pirq;
+ trace_kvm_xen_get_free_pirq(pirq, get->type);
+ return 0;
}
struct xenevtchn_handle *xen_be_evtchn_open(void)
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index 352c875..a7383f7 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -45,6 +45,7 @@ struct evtchn_status;
struct evtchn_close;
struct evtchn_unmask;
struct evtchn_bind_virq;
+struct evtchn_bind_pirq;
struct evtchn_bind_ipi;
struct evtchn_send;
struct evtchn_alloc_unbound;
@@ -55,6 +56,7 @@ int xen_evtchn_status_op(struct evtchn_status *status);
int xen_evtchn_close_op(struct evtchn_close *close);
int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq);
+int xen_evtchn_bind_pirq_op(struct evtchn_bind_pirq *pirq);
int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi);
int xen_evtchn_send_op(struct evtchn_send *send);
int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
generated by cgit v1.1 at 2024-12-25 01:42:32 +0000