@@ -71,4 +71,37 @@ static inline int uv_call(unsigned long r1, unsigned long r2)
return cc;
}
+static inline int share(unsigned long addr, u16 cmd)
+{
+ struct uv_cb_share uvcb = {
+ .header.cmd = cmd,
+ .header.len = sizeof(uvcb),
+ .paddr = addr
+ };
+
+ uv_call(0, (u64)&uvcb);
+ return uvcb.header.rc;
+}
+
+/*
+ * Guest 2 request to the Ultravisor to make a page shared with the
+ * hypervisor for IO.
+ *
+ * @addr: Real or absolute address of the page to be shared
+ */
+static inline int uv_set_shared(unsigned long addr)
+{
+ return share(addr, UVC_CMD_SET_SHARED_ACCESS);
+}
+
+/*
+ * Guest 2 request to the Ultravisor to make a page unshared.
+ *
+ * @addr: Real or absolute address of the page to be unshared
+ */
+static inline int uv_remove_shared(unsigned long addr)
+{
+ return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
+}
+
#endif
When communicating with the host we need to share part of the memory. Let's implement the ultravisor calls for this. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Suggested-by: Janosch Frank <frankja@linux.ibm.com> --- lib/s390x/asm/uv.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)