[Xen-devel] vmx_update_guest_cr() losing EXCEPTION_BITMAP setting

["Byrne, John (HP Labs)" <john.l.byrne@xxxxxx>]

Running a heavily modified xen-unstable changset 19590:f80cf52a4fb6 with 
debugger_attached set, I was seeing the debug traps getting lost from the 
EXCEPTION_BITMAP in vmx_update_guest_cr() when transitioning from real to 
protected mode.  In my codebase, I could fix this trivially by clearing the 
debug_state_latch and letting vmx_do_resume() reapply the setting. However, 
while it looks like a valid issue in the unmodified codebase, I'm not sure. So 
maybe someone might test/examine it and decide if it is real and whether some 
more complex fix is required?

John Byrne


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel