[RFC][PATCH 05/10] xen/hybrid: Add PV halt support

[Sheng Yang]

Signed-off-by: Sheng Yang <sheng@xxxxxxxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |    2 ++
 arch/x86/xen/irq.c       |   10 ++++++++++
 arch/x86/xen/xen-ops.h   |    1 +
 3 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b290d65..b95c696 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1122,5 +1122,7 @@ void __init xen_start_hybrid(void)
 	r = init_hybrid_info();
 	if (r < 0)
 		return;
+
+	xen_hybrid_init_irq_ops();
 }
 
diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index cfd1779..52885c1 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -98,6 +98,10 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_irq_enable);
 
 static void xen_safe_halt(void)
 {
+	/* Do local_irq_enable() explicitly in hybrid guest */
+	if (xen_hybrid_enabled())
+		local_irq_enable();
+
 	/* Blocking includes an implicit local_irq_enable(). */
 	if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
 		BUG();
@@ -130,3 +134,9 @@ void __init xen_init_irq_ops()
 {
 	pv_irq_ops = xen_irq_ops;
 }
+
+void __init xen_hybrid_init_irq_ops(void)
+{
+	pv_irq_ops.safe_halt = xen_safe_halt;
+	pv_irq_ops.halt = xen_halt;
+}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index ca6596b..9bb90d5 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -43,6 +43,7 @@ void xen_vcpu_restore(void);
 void __init xen_build_dynamic_phys_to_machine(void);
 
 void xen_init_irq_ops(void);
+void xen_hybrid_init_irq_ops(void);
 void xen_setup_timer(int cpu);
 void xen_teardown_timer(int cpu);
 cycle_t xen_clocksource_read(void);
-- 
1.5.4.5

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