linux-kernel - [PATCH] acpi: don't register acpi_pad driver if running as xen dom0

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1476270705-16209-1-git-send-email-jgross@suse.com>
Date:   Wed, 12 Oct 2016 13:11:45 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org,
        linux-acpi@...r.kernel.org
Cc:     lenb@...nel.org, rjw@...ysocki.net, Juergen Gross <jgross@...e.com>
Subject: [PATCH] acpi: don't register acpi_pad driver if running as xen dom0

When running as Xen dom0 a special processor_aggregator driver is
needed. Don't register the standard driver in this case.

Without that check an error message:

"Error: Driver 'processor_aggregator' is already registered,
aborting..."

will be displayed.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 drivers/acpi/acpi_pad.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 8ea8211..1c3be12 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -26,6 +26,7 @@
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <asm/mwait.h>
+#include <xen/xen.h>
 
 #define ACPI_PROCESSOR_AGGREGATOR_CLASS	"acpi_pad"
 #define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
@@ -477,6 +478,10 @@ static struct acpi_driver acpi_pad_driver = {
 
 static int __init acpi_pad_init(void)
 {
+	/* Xen acpi pad is responsible when running as Xen Dom0. */
+	if (xen_initial_domain())
+		return -ENODEV;
+
 	power_saving_mwait_init();
 	if (power_saving_mwait_eax == 0)
 		return -EINVAL;
-- 
2.6.6