[Xen-changelog] [xen master] xen/arm: Don't dump stack when the VCPU is offline

[patchbot@xxxxxxx]

commit f042e3280babbe66884371eee18bd0f38b016a8e
Author:     Julien Grall <julien.grall@xxxxxxxxxx>
AuthorDate: Wed Sep 25 13:12:47 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Sep 26 16:18:41 2013 +0100

    xen/arm: Don't dump stack when the VCPU is offline
    
    When a VCPU is not yet online, the registers contain garbagge. This will
    result to call randomly BUG() in show_guest_stack.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/traps.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 0e9a141..4c0fc32 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -612,6 +612,12 @@ static void show_guest_stack(struct vcpu *v, struct 
cpu_user_regs *regs)
     void *mapped;
     unsigned long *stack, addr;
 
+    if ( test_bit(_VPF_down, &v->pause_flags) )
+    {
+        printk("No stack trace, VCPU offline\n");
+        return;
+    }
+
     switch ( regs->cpsr & PSR_MODE_MASK )
     {
     case PSR_MODE_USR:
--
generated by git-patchbot for /home/xen/git/xen.git#master

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog