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Subject[tip: x86/entry] x86/entry: Use run_sysvec_on_irqstack_cond() for XEN upcall
The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 359f01d1816fc1ea0161e6c30722bef1ed6b8abb
Gitweb: https://git.kernel.org/tip/359f01d1816fc1ea0161e6c30722bef1ed6b8abb
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Wed, 10 Feb 2021 00:40:49 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 10 Feb 2021 23:34:15 +01:00

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


---
arch/x86/entry/common.c | 19 ++++++-------------
1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index c4efffb..60a5fc4 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -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)) {
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