linux-kernel - [PATCH 4/9] xen/x86: allow "earlyprintk=xen" to work for PV Dom0

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Date:   Tue, 7 Sep 2021 12:09:37 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: [PATCH 4/9] xen/x86: allow "earlyprintk=xen" to work for PV Dom0

With preferred consoles "tty" and "hvc" announced as preferred,
registering "xenboot" early won't result in use of the console: It also
needs to be registered as preferred. Generalize this from being DomU-
only so far.

Signed-off-by: Jan Beulich <jbeulich@...e.com>

--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1340,7 +1340,6 @@ asmlinkage __visible void __init xen_sta
 	boot_params.hdr.hardware_subarch = X86_SUBARCH_XEN;
 
 	if (!xen_initial_domain()) {
-		add_preferred_console("xenboot", 0, NULL);
 		if (pci_xen)
 			x86_init.pci.arch_init = pci_xen_init;
 	} else {
@@ -1383,6 +1382,7 @@ asmlinkage __visible void __init xen_sta
 #endif
 	}
 
+	add_preferred_console("xenboot", 0, NULL);
 	if (!boot_params.screen_info.orig_video_isVGA)
 		add_preferred_console("tty", 0, NULL);
 	add_preferred_console("hvc", 0, NULL);