This is a note to let you know that I've just added the patch titled
x86/xen: no need to explicitly register an NMI callback
to the 3.14-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-xen-no-need-to-explicitly-register-an-nmi-callback.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ea9f9274bf4337ba7cbab241c780487651642d63 Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Mon, 16 Jun 2014 13:07:00 +0200
Subject: x86/xen: no need to explicitly register an NMI callback
From: David Vrabel <david.vrabel@xxxxxxxxxx>
commit ea9f9274bf4337ba7cbab241c780487651642d63 upstream.
Remove xen_enable_nmi() to fix a 64-bit guest crash when registering
the NMI callback on Xen 3.1 and earlier.
It's not needed since the NMI callback is set by a set_trap_table
hypercall (in xen_load_idt() or xen_write_idt_entry()).
It's also broken since it only set the current VCPU's callback.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Reported-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Tested-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Cc: Steven Noonan <steven@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/xen/setup.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -574,13 +574,7 @@ void xen_enable_syscall(void)
}
#endif /* CONFIG_X86_64 */
}
-void xen_enable_nmi(void)
-{
-#ifdef CONFIG_X86_64
- if (register_callback(CALLBACKTYPE_nmi, (char *)nmi))
- BUG();
-#endif
-}
+
void __init xen_pvmmu_arch_setup(void)
{
HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
@@ -595,7 +589,6 @@ void __init xen_pvmmu_arch_setup(void)
xen_enable_sysenter();
xen_enable_syscall();
- xen_enable_nmi();
}
/* This function is not called for HVM domains */
Patches currently in stable-queue which might be from david.vrabel@xxxxxxxxxx are
queue-3.14/x86-xen-no-need-to-explicitly-register-an-nmi-callback.patch
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