New upstream version 16.11.6

[deb_dpdk.git] / lib / librte_vhost / vhost.h

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 9f60ff8..c49db0c 100644 (file)
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -225,19 +225,24 @@ extern struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
 
 /* Convert guest physical Address to host virtual address */
 static inline uint64_t __attribute__((always_inline))
-gpa_to_vva(struct virtio_net *dev, uint64_t gpa)
+gpa_to_vva(struct virtio_net *dev, uint64_t gpa, uint64_t *len)
 {
-       struct virtio_memory_region *reg;
+       struct virtio_memory_region *r;
        uint32_t i;
 
        for (i = 0; i < dev->mem->nregions; i++) {
-               reg = &dev->mem->regions[i];
-               if (gpa >= reg->guest_phys_addr &&
-                   gpa <  reg->guest_phys_addr + reg->size) {
-                       return gpa - reg->guest_phys_addr +
-                              reg->host_user_addr;
+               r = &dev->mem->regions[i];
+               if (gpa >= r->guest_phys_addr &&
+                   gpa <  r->guest_phys_addr + r->size) {
+
+                       if (unlikely(*len > r->guest_phys_addr + r->size - gpa))
+                               *len = r->guest_phys_addr + r->size - gpa;
+
+                       return gpa - r->guest_phys_addr +
+                              r->host_user_addr;
                }
        }
+       *len = 0;
 
        return 0;
 }