[Xen-devel] [PATCH] Qemu serial patch

["Yang, Xiaowei" <xiaowei.yang@xxxxxxxxx>]

Original Qemu serial.c uses non-waiting write. If it's bound to a
physical serial port, there are chances that write need to wait for a
while. In this occasion, the characters are lost. This patch adds an up
to 100ms wait for write. In addition, it turns off output processing.

Currently we can debug HVM Windows with windbg running on another
machine. To do so, 
1) Serial driver in xen0 must be enabled 
2) Add serial='/dev/ttySX" (ttySX is a physical device name registered
by serial driver) in HVM configure file 
3) Add xencons=ttySY (ttySY is a pseudo device name, say ttyS8, other
than any serial device name) in grub. Otherwise, Xen virtual console
will try to register ttyS1 by default which is grubbed by serial drivers
and fail.
4) Add debug options (e.g. /debug /debugport=COM1 /baudrate=57600) in
HVM Windows' boot.ini.

Thanks, 
Xiaowei

Attachment: serial_enabled.patch
Description: serial_enabled.patch

Attachment: serial.patch
Description: serial.patch

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