linux-kernel - [PATCH 1/4] KVM: ioapic: merge ioapic_deliver into ioapic

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Date:	Tue, 18 Mar 2014 15:27:06 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	gleb@...nel.org, mtosatti@...hat.com
Subject: [PATCH 1/4] KVM: ioapic: merge ioapic_deliver into ioapic_service

Commonize the handling of masking, which was absent for kvm_ioapic_set_irq.
Setting remote_irr does not need a separate function either, and merging
the two functions avoids confusion.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 virt/kvm/ioapic.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 1539d3757a04..0b4914147b9d 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -50,7 +50,7 @@
 #else
 #define ioapic_debug(fmt, arg...)
 #endif
-static int ioapic_deliver(struct kvm_ioapic *vioapic, int irq,
+static int ioapic_service(struct kvm_ioapic *vioapic, int irq,
 		bool line_status);
 
 static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
@@ -163,23 +163,6 @@ static bool rtc_irq_check_coalesced(struct kvm_ioapic *ioapic)
 	return false;
 }
 
-static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx,
-		bool line_status)
-{
-	union kvm_ioapic_redirect_entry *pent;
-	int injected = -1;
-
-	pent = &ioapic->redirtbl[idx];
-
-	if (!pent->fields.mask) {
-		injected = ioapic_deliver(ioapic, idx, line_status);
-		if (injected && pent->fields.trig_mode == IOAPIC_LEVEL_TRIG)
-			pent->fields.remote_irr = 1;
-	}
-
-	return injected;
-}
-
 static void update_handled_vectors(struct kvm_ioapic *ioapic)
 {
 	DECLARE_BITMAP(handled_vectors, 256);
@@ -282,12 +265,15 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 	}
 }
 
-static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
+static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
 {
 	union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
 	struct kvm_lapic_irq irqe;
 	int ret;
 
+	if (entry->fields.mask)
+		return -1;
+
 	ioapic_debug("dest=%x dest_mode=%x delivery_mode=%x "
 		     "vector=%x trig_mode=%x\n",
 		     entry->fields.dest_id, entry->fields.dest_mode,
@@ -310,6 +296,9 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq, bool line_status)
 	} else
 		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
 
+	if (ret && irqe.trig_mode == IOAPIC_LEVEL_TRIG)
+		entry->fields.remote_irr = 1;
+
 	return ret;
 }
 
@@ -393,7 +382,7 @@ static void __kvm_ioapic_update_eoi(struct kvm_vcpu *vcpu,
 
 		ASSERT(ent->fields.trig_mode == IOAPIC_LEVEL_TRIG);
 		ent->fields.remote_irr = 0;
-		if (!ent->fields.mask && (ioapic->irr & (1 << i)))
+		if (ioapic->irr & (1 << i))
 			ioapic_service(ioapic, i, false);
 	}
 }
-- 
1.8.3.1


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