Commit adf330a7 authored by Jan Beulich's avatar Jan Beulich Committed by Juergen Gross
Browse files

xen/x86: make "earlyprintk=xen" work better for PVH Dom0 



The xen_hvm_early_write() path better wouldn't be taken in this case;
while port 0xE9 can be used, the hypercall path is quite a bit more
efficient. Put that first, as it may also work for DomU-s (see also
xen_raw_console_write()).

While there also bail from the function when the first
domU_write_console() failed - later ones aren't going to succeed.

Signed-off-by: default avatarJan Beulich <jbeulich@suse.com>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>

Link: https://lore.kernel.org/r/4fd89dcb-cfc5-c740-2e94-bb271e432d3e@suse.com


Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent cae7d81a

drivers/tty/hvc/hvc_xen.c

+4 −5
Original line number Diff line number Diff line
@@ -621,17 +621,16 @@ static void xenboot_write_console(struct console *console, const char *string, 
	unsigned int linelen, off = 0;

	const char *pos;



	if (dom0_write_console(0, string, len) >= 0)

		return;



	if (!xen_pv_domain()) {

		xen_hvm_early_write(0, string, len);

		return;

	}



	dom0_write_console(0, string, len);



	if (xen_initial_domain())

	if (domU_write_console(0, "(early) ", 8) < 0)

		return;



	domU_write_console(0, "(early) ", 8);

	while (off < len && NULL != (pos = strchr(string+off, '\n'))) {

		linelen = pos-string+off;

		if (off + linelen > len)