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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
This commit is contained in:
Thomas Gleixner 2021-02-10 00:40:49 +01:00
parent 5b51e1db9b
commit 359f01d181
1 changed files with 6 additions and 13 deletions
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19
arch/x86/entry/common.c
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@ -245,30 +245,23 @@ static __always_inline bool get_and_clear_inhcall(void) { return false; }
static __always_inline void restore_inhcall(bool inhcall) { }
#endif
static void __xen_pv_evtchn_do_upcall(void)
static void __xen_pv_evtchn_do_upcall(struct pt_regs *regs)
{
irq_enter_rcu();
struct pt_regs *old_regs = set_irq_regs(regs);
inc_irq_stat(irq_hv_callback_count);
xen_hvm_evtchn_do_upcall();
irq_exit_rcu();
set_irq_regs(old_regs);
}
__visible noinstr void xen_pv_evtchn_do_upcall(struct pt_regs *regs)
{
struct pt_regs *old_regs;
irqentry_state_t state = irqentry_enter(regs);
bool inhcall;
irqentry_state_t state;
state = irqentry_enter(regs);
old_regs = set_irq_regs(regs);
instrumentation_begin();
run_on_irqstack_cond(__xen_pv_evtchn_do_upcall, regs);
instrumentation_end();
set_irq_regs(old_regs);
run_sysvec_on_irqstack_cond(__xen_pv_evtchn_do_upcall, regs);
inhcall = get_and_clear_inhcall();
if (inhcall && !WARN_ON_ONCE(state.exit_rcu)) {