x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall
To avoid yet another macro implementation reuse the existing run_sysvec_on_irqstack_cond() and move the set_irq_regs() handling into the called function. Makes the code even simpler. Signed-off-by:Thomas Gleixner <tglx@linutronix.de> Reviewed-by:
Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210210002512.869753106@linutronix.de
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