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x86/xen: no need to explicitly register an NMI callback 

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@citrix.com>
Reported-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
This commit is contained in:
David Vrabel 2014-06-16 13:07:00 +02:00
parent 562658f3dc
commit ea9f9274bf
1 changed files with 1 additions and 8 deletions
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9
arch/x86/xen/setup.c
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@ -594,13 +594,7 @@ 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);
@ -615,7 +609,6 @@ void __init xen_pvmmu_arch_setup(void)
xen_enable_sysenter();
xen_enable_syscall();
xen_enable_nmi();
}
/* This function is not called for HVM domains */