From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com
Cc: jgross@suse.com, x86@kernel.org, linux-kernel@vger.kernel.org,
andy@strugglers.net, xen-devel@lists.xenproject.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: [PATCH] x86/EISA: Don't probe EISA bus for Xen PV guests
Date: Tue, 11 Sep 2018 15:55:38 -0400 [thread overview]
Message-ID: <20180911195538.23289-1-boris.ostrovsky__35491.5925804109$1536695633$gmane$org@oracle.com> (raw)
For unprivileged Xen PV guests this is normal memory and ioremap will
not be able to properly map it.
While at it, since ioremap may return NULL, add a test for pointer's
validity.
Reported-by: Andy Smith <andy@strugglers.net>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
arch/x86/kernel/eisa.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/eisa.c b/arch/x86/kernel/eisa.c
index f260e452e4f8..fcf3de1712c8 100644
--- a/arch/x86/kernel/eisa.c
+++ b/arch/x86/kernel/eisa.c
@@ -7,11 +7,17 @@
#include <linux/eisa.h>
#include <linux/io.h>
+#include <xen/xen.h>
+
static __init int eisa_bus_probe(void)
{
- void __iomem *p = ioremap(0x0FFFD9, 4);
+ void __iomem *p;
+
+ if (xen_pv_domain() && !xen_initial_domain())
+ return 0;
- if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
+ p = ioremap(0x0FFFD9, 4);
+ if (p && readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
EISA_bus = 1;
iounmap(p);
return 0;
--
2.17.1
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next reply other threads:[~2018-09-11 19:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-11 19:55 Boris Ostrovsky [this message]
2018-09-11 19:55 [PATCH] x86/EISA: Don't probe EISA bus for Xen PV guests Boris Ostrovsky
2018-09-11 20:20 ` Thomas Gleixner
2018-09-11 20:20 ` Thomas Gleixner
2018-09-11 20:30 ` Boris Ostrovsky
2018-09-11 20:30 ` Boris Ostrovsky
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