[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Patch "x86/EISA: Don't probe EISA bus for Xen PV guests" has been added to the 4.14-stable tree
This is a note to let you know that I've just added the patch titled x86/EISA: Don't probe EISA bus for Xen PV guests to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-eisa-don-t-probe-eisa-bus-for-xen-pv-guests.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. From 6a92b11169a65b3f8cc512c75a252cbd0d096ba0 Mon Sep 17 00:00:00 2001 From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Date: Tue, 11 Sep 2018 15:55:38 -0400 Subject: x86/EISA: Don't probe EISA bus for Xen PV guests From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> commit 6a92b11169a65b3f8cc512c75a252cbd0d096ba0 upstream. 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@xxxxxxxxxxxxxx> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: hpa@xxxxxxxxx Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx Cc: jgross@xxxxxxxx Cc: stable@xxxxxxxxxxxxxxx Link: https://lkml.kernel.org/r/20180911195538.23289-1-boris.ostrovsky@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kernel/eisa.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- 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; Patches currently in stable-queue which might be from boris.ostrovsky@xxxxxxxxxx are queue-4.14/xen-netfront-fix-waiting-for-xenbus-state-change.patch queue-4.14/x86-eisa-don-t-probe-eisa-bus-for-xen-pv-guests.patch queue-4.14/x86-mm-pti-add-an-overflow-check-to-pti_clone_pmds.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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