qemu-char: Add new char backend CirMemCharDriver

[qemu.git] / qemu-options.hx

diff --git a/qemu-options.hx b/qemu-options.hx
index 4e2b4994a21cf23b1f25763929c622cbed541add..2d44137bf9a974cc4165d1db9301e0334a0200b8 100644 (file)
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -1736,6 +1736,7 @@ DEF("chardev", HAS_ARG, QEMU_OPTION_chardev,
     "-chardev msmouse,id=id[,mux=on|off]\n"
     "-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]\n"
     "         [,mux=on|off]\n"
+    "-chardev memory,id=id,maxcapacity=maxcapacity\n"
     "-chardev file,id=id,path=path[,mux=on|off]\n"
     "-chardev pipe,id=id,path=path[,mux=on|off]\n"
 #ifdef _WIN32
@@ -1777,6 +1778,7 @@ Backend is one of:
 @option{udp},
 @option{msmouse},
 @option{vc},
+@option{memory},
 @option{file},
 @option{pipe},
 @option{console},
@@ -1885,6 +1887,14 @@ the console, in pixels.
 @option{cols} and @option{rows} specify that the console be sized to fit a text
 console with the given dimensions.
 
+@item -chardev memory ,id=@var{id} ,maxcapacity=@var{maxcapacity}
+
+Create a circular buffer with fixed size indicated by optionally @option{maxcapacity}
+which will be default 64K if it is not given.
+
+@option{maxcapacity} specifies the max capacity of the size of circular buffer
+to create. Should be power of 2.
+
 @item -chardev file ,id=@var{id} ,path=@var{path}
 
 Log all traffic received from the guest to a file.