[Xen-changelog] [xen stable-4.5] x86/traps: avoid using current too early on boot

[patchbot@xxxxxxx]

commit 36a7c54a698db7d087873b312087cfa64de33175
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Mon Jul 13 13:54:47 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jul 13 13:54:47 2015 +0200

    x86/traps: avoid using current too early on boot
    
    Early on boot, current has the sentinel value 0xfffff000.  Blindly using it 
in
    show_registers() causes a nested failure and no useful information printed
    from an early crash.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 142473cfce41a565898e0fa33dc98a1f5e41abe4
    master date: 2015-06-25 14:57:04 +0200
---
 xen/arch/x86/x86_64/traps.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/x86_64/traps.c b/xen/arch/x86/x86_64/traps.c
index 8a4b584..6477d1d 100644
--- a/xen/arch/x86/x86_64/traps.c
+++ b/xen/arch/x86/x86_64/traps.c
@@ -86,7 +86,7 @@ void show_registers(const struct cpu_user_regs *regs)
     struct cpu_user_regs fault_regs = *regs;
     unsigned long fault_crs[8];
     enum context context;
-    struct vcpu *v = current;
+    struct vcpu *v = system_state >= SYS_STATE_smp_boot ? current : NULL;
 
     if ( guest_mode(regs) && has_hvm_container_vcpu(v) )
     {
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.5

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