Basic memory sharing.
The introduces the basic functionality for memory sharing. The API used
to invoke memory sharing is a placeholder while we decide on what the
proper interface should look like.
Change-Id: Ia5c2c224119d896b3fc2294b0828626ec325e1e7
diff --git a/inc/vmapi/hf/call.h b/inc/vmapi/hf/call.h
index 8014f8c..b0345e2 100644
--- a/inc/vmapi/hf/call.h
+++ b/inc/vmapi/hf/call.h
@@ -37,6 +37,7 @@
#define HF_INTERRUPT_ENABLE 0xff0b
#define HF_INTERRUPT_GET 0xff0c
#define HF_INTERRUPT_INJECT 0xff0d
+#define HF_SHARE_MEMORY 0xff0e
/** The amount of data that can be sent to a mailbox. */
#define HF_MAILBOX_SIZE 4096
@@ -223,3 +224,18 @@
return hf_call(HF_INTERRUPT_INJECT, target_vm_id, target_vcpu_idx,
intid);
}
+
+/**
+ * Shares a region of memory with another VM.
+ *
+ * Returns 0 on success or -1 if the sharing was not allowed or failed.
+ *
+ * TODO: replace this with a better API once we have decided what that should
+ * look like.
+ */
+static inline int64_t hf_share_memory(uint32_t vm_id, hf_ipaddr_t addr,
+ size_t size, enum hf_share share)
+{
+ return hf_call(HF_SHARE_MEMORY, (((uint64_t)vm_id) << 32) | share, addr,
+ size);
+}