[PATCH 1/2] vhost: add ioctl to query nregions upper limit

[Igor Mammedov <imammedo@redhat.com>]

From: "Michael S. Tsirkin" <mst@redhat.com>

Userspace currently simply tries to give vhost as many regions
as it happens to have, but you only have the mem table
when you have initialized a large part of VM, so graceful
failure is very hard to support.

The result is that userspace tends to fail catastrophically.

Instead, add a new ioctl so userspace can find out how much kernel
supports, up front. This returns a positive value that we commit to.

Also, document our contract with legacy userspace: when running on an
old kernel, you get -1 and you can assume at least 64 slots.  Since 0
value's left unused, let's make that mean that the current userspace
behaviour (trial and error) is required, just in case we want it back.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 drivers/vhost/vhost.c      |  7 ++++++-
 include/uapi/linux/vhost.h | 17 ++++++++++++++++-
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index eec2f11..76dc0cf 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -30,7 +30,7 @@
 
 #include "vhost.h"
 
-static ushort max_mem_regions = 64;
+static ushort max_mem_regions = VHOST_MEM_MAX_NREGIONS_DEFAULT;
 module_param(max_mem_regions, ushort, 0444);
 MODULE_PARM_DESC(max_mem_regions,
 	"Maximum number of memory regions in memory map. (default: 64)");
@@ -944,6 +944,11 @@ long vhost_dev_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp)
 	long r;
 	int i, fd;
 
+	if (ioctl == VHOST_GET_MEM_MAX_NREGIONS) {
+		r = max_mem_regions;
+		goto done;
+	}
+
 	/* If you are not the owner, you can become one */
 	if (ioctl == VHOST_SET_OWNER) {
 		r = vhost_dev_set_owner(d);
diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index ab373191..2511954 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -80,7 +80,7 @@ struct vhost_memory {
  * Allows subsequent call to VHOST_OWNER_SET to succeed. */
 #define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
 
-/* Set up/modify memory layout */
+/* Set up/modify memory layout: see also VHOST_GET_MEM_MAX_NREGIONS below. */
 #define VHOST_SET_MEM_TABLE	_IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)
 
 /* Write logging setup. */
@@ -127,6 +127,21 @@ struct vhost_memory {
 /* Set eventfd to signal an error */
 #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
 
+/* Query upper limit on nregions in VHOST_SET_MEM_TABLE arguments.
+ * Returns:
+ *	0 < value <= MAX_INT - gives the upper limit, higher values will fail
+ *	0 - there's no static limit: try and see if it works
+ *	-1 - on failure
+ */
+#define VHOST_GET_MEM_MAX_NREGIONS   _IO(VHOST_VIRTIO, 0x23)
+
+/* Returned by VHOST_GET_MEM_MAX_NREGIONS to mean there's no static limit:
+ * try and it'll work if you are lucky. */
+#define VHOST_MEM_MAX_NREGIONS_NONE 0
+/* We support at least as many nregions in VHOST_SET_MEM_TABLE:
+ * for use on legacy kernels without VHOST_GET_MEM_MAX_NREGIONS support. */
+#define VHOST_MEM_MAX_NREGIONS_DEFAULT 64
+
 /* VHOST_NET specific defines */
 
 /* Attach virtio net ring to a raw socket, or tap device.
-- 
1.8.3.1