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Subject: [PATCH v8 20/28] vfio-user: implement VFIO_USER_DEVICE_GET/SET_IRQ*
Date: Wed, 19 Feb 2025 15:48:50 +0100
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From: Jagannathan Raman <jag.raman@oracle.com>
IRQ setup uses the same semantics as the traditional vfio path, but we
need to share the corresponding file descriptors with the server as
necessary.
Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
---
hw/vfio-user/common.c | 140 ++++++++++++++++++++++++++++++++++++++
hw/vfio-user/protocol.h | 25 +++++++
hw/vfio-user/trace-events | 2 +
3 files changed, 167 insertions(+)
diff --git a/hw/vfio-user/common.c b/hw/vfio-user/common.c
index 1a9033af5c..182ef5ab8f 100644
--- a/hw/vfio-user/common.c
+++ b/hw/vfio-user/common.c
@@ -1179,6 +1179,122 @@ static int vfio_user_get_region_info(VFIOUserProxy =
*proxy,
return 0;
}
=20
+static int vfio_user_get_irq_info(VFIOUserProxy *proxy,
+ struct vfio_irq_info *info)
+{
+ VFIOUserIRQInfo msg;
+
+ memset(&msg, 0, sizeof(msg));
+ vfio_user_request_msg(&msg.hdr, VFIO_USER_DEVICE_GET_IRQ_INFO,
+ sizeof(msg), 0);
+ msg.argsz =3D info->argsz;
+ msg.index =3D info->index;
+
+ vfio_user_send_wait(proxy, &msg.hdr, NULL, 0);
+ if (msg.hdr.flags & VFIO_USER_ERROR) {
+ return -msg.hdr.error_reply;
+ }
+ trace_vfio_user_get_irq_info(msg.index, msg.flags, msg.count);
+
+ memcpy(info, &msg.argsz, sizeof(*info));
+ return 0;
+}
+
+static int irq_howmany(int *fdp, uint32_t cur, uint32_t max)
+{
+ int n =3D 0;
+
+ if (fdp[cur] !=3D -1) {
+ do {
+ n++;
+ } while (n < max && fdp[cur + n] !=3D -1);
+ } else {
+ do {
+ n++;
+ } while (n < max && fdp[cur + n] =3D=3D -1);
+ }
+
+ return n;
+}
+
+static int vfio_user_set_irqs(VFIOUserProxy *proxy, struct vfio_irq_set *i=
rq)
+{
+ g_autofree VFIOUserIRQSet *msgp =3D NULL;
+ uint32_t size, nfds, send_fds, sent_fds, max;
+
+ if (irq->argsz < sizeof(*irq)) {
+ error_printf("vfio_user_set_irqs argsz too small\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Handle simple case
+ */
+ if ((irq->flags & VFIO_IRQ_SET_DATA_EVENTFD) =3D=3D 0) {
+ size =3D sizeof(VFIOUserHdr) + irq->argsz;
+ msgp =3D g_malloc0(size);
+
+ vfio_user_request_msg(&msgp->hdr, VFIO_USER_DEVICE_SET_IRQS, size,=
0);
+ msgp->argsz =3D irq->argsz;
+ msgp->flags =3D irq->flags;
+ msgp->index =3D irq->index;
+ msgp->start =3D irq->start;
+ msgp->count =3D irq->count;
+ trace_vfio_user_set_irqs(msgp->index, msgp->start, msgp->count,
+ msgp->flags);
+
+ vfio_user_send_wait(proxy, &msgp->hdr, NULL, 0);
+ if (msgp->hdr.flags & VFIO_USER_ERROR) {
+ return -msgp->hdr.error_reply;
+ }
+
+ return 0;
+ }
+
+ /*
+ * Calculate the number of FDs to send
+ * and adjust argsz
+ */
+ nfds =3D (irq->argsz - sizeof(*irq)) / sizeof(int);
+ irq->argsz =3D sizeof(*irq);
+ msgp =3D g_malloc0(sizeof(*msgp));
+ /*
+ * Send in chunks if over max_send_fds
+ */
+ for (sent_fds =3D 0; nfds > sent_fds; sent_fds +=3D send_fds) {
+ VFIOUserFDs *arg_fds, loop_fds;
+
+ /* must send all valid FDs or all invalid FDs in single msg */
+ max =3D nfds - sent_fds;
+ if (max > proxy->max_send_fds) {
+ max =3D proxy->max_send_fds;
+ }
+ send_fds =3D irq_howmany((int *)irq->data, sent_fds, max);
+
+ vfio_user_request_msg(&msgp->hdr, VFIO_USER_DEVICE_SET_IRQS,
+ sizeof(*msgp), 0);
+ msgp->argsz =3D irq->argsz;
+ msgp->flags =3D irq->flags;
+ msgp->index =3D irq->index;
+ msgp->start =3D irq->start + sent_fds;
+ msgp->count =3D send_fds;
+ trace_vfio_user_set_irqs(msgp->index, msgp->start, msgp->count,
+ msgp->flags);
+
+ loop_fds.send_fds =3D send_fds;
+ loop_fds.recv_fds =3D 0;
+ loop_fds.fds =3D (int *)irq->data + sent_fds;
+ arg_fds =3D loop_fds.fds[0] !=3D -1 ? &loop_fds : NULL;
+
+ vfio_user_send_wait(proxy, &msgp->hdr, arg_fds, 0);
+ if (msgp->hdr.flags & VFIO_USER_ERROR) {
+ return -msgp->hdr.error_reply;
+ }
+ }
+
+ return 0;
+}
+
static int vfio_user_region_read(VFIOUserProxy *proxy, uint8_t index,
off_t offset, uint32_t count, void *data)
{
@@ -1275,6 +1391,28 @@ static int vfio_user_io_get_region_info(VFIODevice *=
vbasedev,
return 0;
}
=20
+static int vfio_user_io_get_irq_info(VFIODevice *vbasedev,
+ struct vfio_irq_info *irq)
+{
+ int ret;
+
+ ret =3D vfio_user_get_irq_info(vbasedev->proxy, irq);
+ if (ret) {
+ return ret;
+ }
+
+ if (irq->index > vbasedev->num_irqs) {
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int vfio_user_io_set_irqs(VFIODevice *vbasedev,
+ struct vfio_irq_set *irqs)
+{
+ return vfio_user_set_irqs(vbasedev->proxy, irqs);
+}
+
static int vfio_user_io_region_read(VFIODevice *vbasedev, uint8_t index,
off_t off, uint32_t size, void *data)
{
@@ -1291,6 +1429,8 @@ static int vfio_user_io_region_write(VFIODevice *vbas=
edev, uint8_t index,
=20
VFIODeviceIO vfio_dev_io_sock =3D {
.get_region_info =3D vfio_user_io_get_region_info,
+ .get_irq_info =3D vfio_user_io_get_irq_info,
+ .set_irqs =3D vfio_user_io_set_irqs,
.region_read =3D vfio_user_io_region_read,
.region_write =3D vfio_user_io_region_write,
};
diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h
index 6987435e96..48dd475ab3 100644
--- a/hw/vfio-user/protocol.h
+++ b/hw/vfio-user/protocol.h
@@ -139,6 +139,31 @@ typedef struct {
uint64_t offset;
} VFIOUserRegionInfo;
=20
+/*
+ * VFIO_USER_DEVICE_GET_IRQ_INFO
+ * imported from struct vfio_irq_info
+ */
+typedef struct {
+ VFIOUserHdr hdr;
+ uint32_t argsz;
+ uint32_t flags;
+ uint32_t index;
+ uint32_t count;
+} VFIOUserIRQInfo;
+
+/*
+ * VFIO_USER_DEVICE_SET_IRQS
+ * imported from struct vfio_irq_set
+ */
+typedef struct {
+ VFIOUserHdr hdr;
+ uint32_t argsz;
+ uint32_t flags;
+ uint32_t index;
+ uint32_t start;
+ uint32_t count;
+} VFIOUserIRQSet;
+
/*
* VFIO_USER_REGION_READ
* VFIO_USER_REGION_WRITE
diff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events
index 3f5aebe7ac..053f5932eb 100644
--- a/hw/vfio-user/trace-events
+++ b/hw/vfio-user/trace-events
@@ -9,3 +9,5 @@ vfio_user_version(uint16_t major, uint16_t minor, const cha=
r *caps) " major %d m
vfio_user_get_info(uint32_t nregions, uint32_t nirqs) " #regions %d #irqs =
%d"
vfio_user_get_region_info(uint32_t index, uint32_t flags, uint64_t size) "=
index %d flags 0x%x size 0x%"PRIx64
vfio_user_region_rw(uint32_t region, uint64_t off, uint32_t count) " regio=
n %d offset 0x%"PRIx64" count %d"
+vfio_user_get_irq_info(uint32_t index, uint32_t flags, uint32_t count) " i=
ndex %d flags 0x%x count %d"
+vfio_user_set_irqs(uint32_t index, uint32_t start, uint32_t count, uint32_=
t flags) " index %d start %d count %d flags 0x%x"
--=20
2.34.1