vhost: get guest/host physical address mappings

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

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index df2107b..2d52987 100644 (file)
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -114,6 +114,12 @@ struct vhost_virtqueue {
  #define VIRTIO_F_VERSION_1 32
 #endif
 
+struct guest_page {
+       uint64_t guest_phys_addr;
+       uint64_t host_phys_addr;
+       uint64_t size;
+};
+
 /**
  * Device structure contains all configuration information relating
  * to the device.
@@ -137,6 +143,10 @@ struct virtio_net {
        uint64_t                log_addr;
        struct ether_addr       mac;
 
+       uint32_t                nr_guest_pages;
+       uint32_t                max_guest_pages;
+       struct guest_page       *guest_pages;
+
 } __rte_cache_aligned;
 
 /**
@@ -217,6 +227,26 @@ gpa_to_vva(struct virtio_net *dev, uint64_t gpa)
        return 0;
 }
 
+/* Convert guest physical address to host physical address */
+static inline phys_addr_t __attribute__((always_inline))
+gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
+{
+       uint32_t i;
+       struct guest_page *page;
+
+       for (i = 0; i < dev->nr_guest_pages; i++) {
+               page = &dev->guest_pages[i];
+
+               if (gpa >= page->guest_phys_addr &&
+                   gpa + size < page->guest_phys_addr + page->size) {
+                       return gpa - page->guest_phys_addr +
+                              page->host_phys_addr;
+               }
+       }
+
+       return 0;
+}
+
 struct virtio_net_device_ops const *notify_ops;
 struct virtio_net *get_device(int vid);