[PATCH v2 11/16] vhost: Add vhost_get_max_memslots()

David Hildenbrand
2023-08-25T13:24:19Z

Let's add vhost_get_max_memslots(), to perform a similar task as
kvm_get_max_memslots().

Signed-off-by: David Hildenbrand <david@redhat.com>
---
hw/virtio/vhost-stub.c | 5 +++++
hw/virtio/vhost.c | 11 +++++++++++
include/hw/virtio/vhost.h | 1 +
3 files changed, 17 insertions(+)

diff --git a/hw/virtio/vhost-stub.c b/hw/virtio/vhost-stub.c
index d53dd9d288..52d42adab2 100644
--- a/hw/virtio/vhost-stub.c
+++ b/hw/virtio/vhost-stub.c
@@ -2,6 +2,11 @@
#include "hw/virtio/vhost.h"
#include "hw/virtio/vhost-user.h"

+unsigned int vhost_get_max_memslots(void)
+{
+ return UINT_MAX;
+}
+
unsigned int vhost_get_free_memslots(void)
{
return UINT_MAX;
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index f7e1ac12a8..ee193b07c7 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -55,6 +55,17 @@ static unsigned int used_shared_memslots;
static QLIST_HEAD(, vhost_dev) vhost_devices =
QLIST_HEAD_INITIALIZER(vhost_devices);

+unsigned int vhost_get_max_memslots(void)
+{
+ unsigned int max = UINT_MAX;
+ struct vhost_dev *hdev;
+
+ QLIST_FOREACH(hdev, &vhost_devices, entry) {
+ max = MIN(max, hdev->vhost_ops->vhost_backend_memslots_limit(hdev));
+ }
+ return max;
+}
+
unsigned int vhost_get_free_memslots(void)
{
unsigned int free = UINT_MAX;
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 603bf834be..c7e5467693 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -315,6 +315,7 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
*/
void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
uint64_t features);
+unsigned int vhost_get_max_memslots(void);
unsigned int vhost_get_free_memslots(void);

int vhost_net_set_backend(struct vhost_dev *hdev,
--
2.41.0