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Subject: [PATCH v8 18/28] vfio-user: implement VFIO_USER_REGION_READ/WRITE
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From: Jagannathan Raman <jag.raman@oracle.com>
Also add support for posted writes on remote devices.
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 | 120 ++++++++++++++++++++++++++++++++++
hw/vfio-user/common.h | 1 +
hw/vfio-user/pci.c | 5 ++
hw/vfio-user/protocol.h | 12 ++++
hw/vfio-user/trace-events | 1 +
hw/vfio/helpers.c | 8 ++-
hw/vfio/pci.c | 5 +-
include/hw/vfio/vfio-common.h | 3 +-
8 files changed, 150 insertions(+), 5 deletions(-)
diff --git a/hw/vfio-user/common.c b/hw/vfio-user/common.c
index 7b96d715cb..1a9033af5c 100644
--- a/hw/vfio-user/common.c
+++ b/hw/vfio-user/common.c
@@ -55,6 +55,8 @@ static void vfio_user_cb(void *opaque);
=20
static void vfio_user_request(void *opaque);
static int vfio_user_send_queued(VFIOUserProxy *proxy, VFIOUserMsg *msg);
+static void vfio_user_send_async(VFIOUserProxy *proxy, VFIOUserHdr *hdr,
+ VFIOUserFDs *fds);
static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr,
VFIOUserFDs *fds, int rsize);
static void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd,
@@ -626,6 +628,33 @@ static int vfio_user_send_queued(VFIOUserProxy *proxy,=
VFIOUserMsg *msg)
return 0;
}
=20
+/*
+ * async send - msg can be queued, but will be freed when sent
+ */
+static void vfio_user_send_async(VFIOUserProxy *proxy, VFIOUserHdr *hdr,
+ VFIOUserFDs *fds)
+{
+ VFIOUserMsg *msg;
+ int ret;
+
+ if (!(hdr->flags & (VFIO_USER_NO_REPLY | VFIO_USER_REPLY))) {
+ error_printf("vfio_user_send_async on sync message\n");
+ return;
+ }
+
+ QEMU_LOCK_GUARD(&proxy->lock);
+
+ msg =3D vfio_user_getmsg(proxy, hdr, fds);
+ msg->id =3D hdr->id;
+ msg->rsize =3D 0;
+ msg->type =3D VFIO_MSG_ASYNC;
+
+ ret =3D vfio_user_send_queued(proxy, msg);
+ if (ret < 0) {
+ vfio_user_recycle(proxy, msg);
+ }
+}
+
static void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUserHdr *hdr,
VFIOUserFDs *fds, int rsize)
{
@@ -1139,9 +1168,84 @@ static int vfio_user_get_region_info(VFIOUserProxy *=
proxy,
trace_vfio_user_get_region_info(msgp->index, msgp->flags, msgp->size);
=20
memcpy(info, &msgp->argsz, info->argsz);
+
+ /* read-after-write hazard if guest can directly access region */
+ if (info->flags & VFIO_REGION_INFO_FLAG_MMAP) {
+ WITH_QEMU_LOCK_GUARD(&proxy->lock) {
+ proxy->flags |=3D VFIO_PROXY_NO_POST;
+ }
+ }
+
return 0;
}
=20
+static int vfio_user_region_read(VFIOUserProxy *proxy, uint8_t index,
+ off_t offset, uint32_t count, void *data)
+{
+ g_autofree VFIOUserRegionRW *msgp =3D NULL;
+ int size =3D sizeof(*msgp) + count;
+
+ if (count > proxy->max_xfer_size) {
+ return -EINVAL;
+ }
+
+ msgp =3D g_malloc0(size);
+ vfio_user_request_msg(&msgp->hdr, VFIO_USER_REGION_READ, sizeof(*msgp)=
, 0);
+ msgp->offset =3D offset;
+ msgp->region =3D index;
+ msgp->count =3D count;
+ trace_vfio_user_region_rw(msgp->region, msgp->offset, msgp->count);
+
+ vfio_user_send_wait(proxy, &msgp->hdr, NULL, size);
+ if (msgp->hdr.flags & VFIO_USER_ERROR) {
+ return -msgp->hdr.error_reply;
+ } else if (msgp->count > count) {
+ return -E2BIG;
+ } else {
+ memcpy(data, &msgp->data, msgp->count);
+ }
+
+ return msgp->count;
+}
+
+static int vfio_user_region_write(VFIOUserProxy *proxy, uint8_t index,
+ off_t offset, uint32_t count, void *data,
+ bool post)
+{
+ VFIOUserRegionRW *msgp =3D NULL;
+ int flags =3D post ? VFIO_USER_NO_REPLY : 0;
+ int size =3D sizeof(*msgp) + count;
+ int ret;
+
+ if (count > proxy->max_xfer_size) {
+ return -EINVAL;
+ }
+
+ msgp =3D g_malloc0(size);
+ vfio_user_request_msg(&msgp->hdr, VFIO_USER_REGION_WRITE, size, flags);
+ msgp->offset =3D offset;
+ msgp->region =3D index;
+ msgp->count =3D count;
+ memcpy(&msgp->data, data, count);
+ trace_vfio_user_region_rw(msgp->region, msgp->offset, msgp->count);
+
+ /* async send will free msg after it's sent */
+ if (post && !(proxy->flags & VFIO_PROXY_NO_POST)) {
+ vfio_user_send_async(proxy, &msgp->hdr, NULL);
+ return count;
+ }
+
+ vfio_user_send_wait(proxy, &msgp->hdr, NULL, 0);
+ if (msgp->hdr.flags & VFIO_USER_ERROR) {
+ ret =3D -msgp->hdr.error_reply;
+ } else {
+ ret =3D count;
+ }
+
+ g_free(msgp);
+ return ret;
+}
+
=20
/*
* Socket-based io_ops
@@ -1171,6 +1275,22 @@ static int vfio_user_io_get_region_info(VFIODevice *=
vbasedev,
return 0;
}
=20
+static int vfio_user_io_region_read(VFIODevice *vbasedev, uint8_t index,
+ off_t off, uint32_t size, void *data)
+{
+ return vfio_user_region_read(vbasedev->proxy, index, off, size, data);
+}
+
+static int vfio_user_io_region_write(VFIODevice *vbasedev, uint8_t index,
+ off_t off, unsigned size, void *data,
+ bool post)
+{
+ return vfio_user_region_write(vbasedev->proxy, index, off, size, data,
+ post);
+}
+
VFIODeviceIO vfio_dev_io_sock =3D {
.get_region_info =3D vfio_user_io_get_region_info,
+ .region_read =3D vfio_user_io_region_read,
+ .region_write =3D vfio_user_io_region_write,
};
diff --git a/hw/vfio-user/common.h b/hw/vfio-user/common.h
index 30a3125ea3..31b11ed614 100644
--- a/hw/vfio-user/common.h
+++ b/hw/vfio-user/common.h
@@ -84,6 +84,7 @@ typedef struct VFIOUserProxy {
/* VFIOProxy flags */
#define VFIO_PROXY_CLIENT 0x1
#define VFIO_PROXY_FORCE_QUEUED 0x4
+#define VFIO_PROXY_NO_POST 0x8
=20
typedef struct VFIODevice VFIODevice;
=20
diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
index fdff6c99e6..26d2960985 100644
--- a/hw/vfio-user/pci.c
+++ b/hw/vfio-user/pci.c
@@ -37,6 +37,7 @@ struct VFIOUserPCIDevice {
VFIOPCIDevice device;
char *sock_name;
bool send_queued; /* all sends are queued */
+ bool no_post; /* all regions write are sync */
};
=20
/*
@@ -99,6 +100,9 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error=
**errp)
if (udev->send_queued) {
proxy->flags |=3D VFIO_PROXY_FORCE_QUEUED;
}
+ if (udev->no_post) {
+ proxy->flags |=3D VFIO_PROXY_NO_POST;
+ }
=20
if (!vfio_user_validate_version(proxy, errp)) {
goto error;
@@ -170,6 +174,7 @@ static void vfio_user_instance_finalize(Object *obj)
static const Property vfio_user_pci_dev_properties[] =3D {
DEFINE_PROP_STRING("socket", VFIOUserPCIDevice, sock_name),
DEFINE_PROP_BOOL("x-send-queued", VFIOUserPCIDevice, send_queued, fals=
e),
+ DEFINE_PROP_BOOL("x-no-posted-writes", VFIOUserPCIDevice, no_post, fal=
se),
};
=20
static void vfio_user_pci_dev_class_init(ObjectClass *klass, void *data)
diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h
index 6f70a48905..6987435e96 100644
--- a/hw/vfio-user/protocol.h
+++ b/hw/vfio-user/protocol.h
@@ -139,4 +139,16 @@ typedef struct {
uint64_t offset;
} VFIOUserRegionInfo;
=20
+/*
+ * VFIO_USER_REGION_READ
+ * VFIO_USER_REGION_WRITE
+ */
+typedef struct {
+ VFIOUserHdr hdr;
+ uint64_t offset;
+ uint32_t region;
+ uint32_t count;
+ char data[];
+} VFIOUserRegionRW;
+
#endif /* VFIO_USER_PROTOCOL_H */
diff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events
index 1860430301..3f5aebe7ac 100644
--- a/hw/vfio-user/trace-events
+++ b/hw/vfio-user/trace-events
@@ -8,3 +8,4 @@ vfio_user_send_write(uint16_t id, int wrote) " id 0x%x wrot=
e 0x%x"
vfio_user_version(uint16_t major, uint16_t minor, const char *caps) " majo=
r %d minor %d caps: %s"
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"
diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c
index 4ed393420e..6bc7600ab1 100644
--- a/hw/vfio/helpers.c
+++ b/hw/vfio/helpers.c
@@ -184,7 +184,8 @@ void vfio_region_write(void *opaque, hwaddr addr,
break;
}
=20
- ret =3D vbasedev->io->region_write(vbasedev, region->nr, addr, size, &=
buf);
+ ret =3D vbasedev->io->region_write(vbasedev, region->nr, addr, size, &=
buf,
+ region->post_wr);
if (ret !=3D size) {
error_report("%s(%s:region%d+0x%"HWADDR_PRIx", 0x%"PRIx64
",%d) failed: %s",
@@ -365,13 +366,14 @@ int vfio_region_setup(Object *obj, VFIODevice *vbased=
ev, VFIORegion *region,
region->size =3D info->size;
region->fd_offset =3D info->offset;
region->nr =3D index;
+ region->post_wr =3D false;
+
if (vbasedev->regfds !=3D NULL) {
region->fd =3D vbasedev->regfds[index];
} else {
region->fd =3D vbasedev->fd;
}
=20
-
if (region->size) {
region->mem =3D g_new0(MemoryRegion, 1);
memory_region_init_io(region->mem, obj, &vfio_region_ops,
@@ -837,7 +839,7 @@ static int vfio_io_region_read(VFIODevice *vbasedev, ui=
nt8_t index, off_t off,
}
=20
static int vfio_io_region_write(VFIODevice *vbasedev, uint8_t index, off_t=
off,
- uint32_t size, void *data)
+ uint32_t size, void *data, bool post)
{
struct vfio_region_info *info =3D vbasedev->regions[index];
int ret;
diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 4ab3bfa2fa..168e331607 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -51,7 +51,7 @@
(off), (size), (data)))
#define VDEV_CONFIG_WRITE(vbasedev, off, size, data) \
((vbasedev)->io->region_write((vbasedev), VFIO_PCI_CONFIG_REGION_INDEX=
, \
- (off), (size), (data)))
+ (off), (size), (data), false))
=20
#define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug"
=20
@@ -1782,6 +1782,9 @@ static void vfio_bar_prepare(VFIOPCIDevice *vdev, int=
nr)
bar->type =3D pci_bar & (bar->ioport ? ~PCI_BASE_ADDRESS_IO_MASK :
~PCI_BASE_ADDRESS_MEM_MASK);
bar->size =3D bar->region.size;
+
+ /* IO regions are sync, memory can be async */
+ bar->region.post_wr =3D (bar->ioport =3D=3D 0);
}
=20
static void vfio_bars_prepare(VFIOPCIDevice *vdev)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index ab7fa7135a..5adbff4fa7 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -60,6 +60,7 @@ typedef struct VFIORegion {
VFIOMmap *mmaps;
uint8_t nr; /* cache the region number for debug */
int fd; /* fd to mmap() region */
+ bool post_wr; /* writes can be posted */
} VFIORegion;
=20
typedef struct VFIOMigration {
@@ -211,7 +212,7 @@ struct VFIODeviceIO {
int (*region_read)(VFIODevice *vdev, uint8_t nr, off_t off, uint32_t s=
ize,
void *data);
int (*region_write)(VFIODevice *vdev, uint8_t nr, off_t off, uint32_t =
size,
- void *data);
+ void *data, bool post);
};
=20
extern VFIODeviceIO vfio_dev_io_ioctl;
--=20
2.34.1