[Xen-devel] [PATCH] xen/hvc-console: Make it work with HVM guests.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 drivers/tty/hvc/hvc_xen.c |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index e61c36c..513a79b 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -183,7 +183,7 @@ static int dom0_write_console(uint32_t vtermno, const char 
*str, int len)
 {
        int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str);
        if (rc < 0)
-               return 0;
+               return rc;
 
        return len;
 }
@@ -641,7 +641,20 @@ struct console xenboot_console = {
 
 void xen_raw_console_write(const char *str)
 {
-       dom0_write_console(0, str, strlen(str));
+       ssize_t len = strlen(str);
+       int rc = 0;
+
+       if (xen_domain()) {
+               dom0_write_console(0, str, len);
+               if (rc == -ENOSYS && xen_hvm_domain())
+                       goto outb_print;
+
+       } else if (xen_cpuid_base()) {
+               int i;
+outb_print:
+               for (i = 0; i < len; i++)
+                       outb(str[i], 0xe9);
+       }
 }
 
 void xen_raw_printk(const char *fmt, ...)
-- 
1.7.7.6


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