[Xen-devel] Re: softirq change was Re: domu_debug support removed on march 25th from traps.c in -unstable

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 13 Apr 2005, at 18:48, Kip Macy wrote:

> No idea why the trace trap flag isn't getting cleared? I can work at
> around it at the application level but that is aesthetically
> displeasing.
You mean that the TF bit is not cleared by the domu_debug code when it 
should be? The correct place to fix this is in 
include/asm-x86/debugger.h in debugger_trap_entry().
In general (not using domu_debug) it is not Xen's job to clear TF. We 
clear it when we 'bounce' the exception into the guest OS, but the 
saved application stack frame will include EFLAGS with the TF bit still 
set. This matches real hardware.
 -- Keir


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