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From: Peter Xu <peterx@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Nitesh Narayan Lal <nitesh@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	peterx@redhat.com, Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: [PATCH v5 3/6] KVM: X86: Use APIC_DEST_* macros properly in kvm_lapic_irq.dest_mode
Date: Wed,  4 Dec 2019 14:07:18 -0500
Message-ID: <20191204190721.29480-4-peterx@redhat.com> (raw)
In-Reply-To: <20191204190721.29480-1-peterx@redhat.com>

We were using either APIC_DEST_PHYSICAL|APIC_DEST_LOGICAL or 0|1 to
fill in kvm_lapic_irq.dest_mode.  It's fine only because in most cases
when we check against dest_mode it's against APIC_DEST_PHYSICAL (which
equals to 0).  However, that's not consistent.  We'll have problem
when we want to start checking against APIC_DEST_LOGICAL, which does
not equals to 1.

This patch firstly introduces kvm_lapic_irq_dest_mode() helper to take
any boolean of destination mode and return the APIC_DEST_* macro.
Then, it replaces the 0|1 settings of irq.dest_mode with the helper.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 5 +++++
 arch/x86/kvm/ioapic.c           | 9 ++++++---
 arch/x86/kvm/irq_comm.c         | 7 ++++---
 arch/x86/kvm/x86.c              | 2 +-
 4 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b79cd6aa4075..2893eae5df9f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1022,6 +1022,11 @@ struct kvm_lapic_irq {
 	bool msi_redir_hint;
 };
 
+static inline u16 kvm_lapic_irq_dest_mode(bool dest_mode_logical)
+{
+	return dest_mode_logical ? APIC_DEST_LOGICAL : APIC_DEST_PHYSICAL;
+}
+
 struct kvm_x86_ops {
 	int (*cpu_has_kvm_support)(void);          /* __init */
 	int (*disabled_by_bios)(void);             /* __init */
diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c
index 9fd2dd89a1c5..e623a4f8d27e 100644
--- a/arch/x86/kvm/ioapic.c
+++ b/arch/x86/kvm/ioapic.c
@@ -331,7 +331,8 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 			irq.vector = e->fields.vector;
 			irq.delivery_mode = e->fields.delivery_mode << 8;
 			irq.dest_id = e->fields.dest_id;
-			irq.dest_mode = e->fields.dest_mode;
+			irq.dest_mode =
+			    kvm_lapic_irq_dest_mode(!!e->fields.dest_mode);
 			bitmap_zero(&vcpu_bitmap, 16);
 			kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq,
 						 &vcpu_bitmap);
@@ -343,7 +344,9 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
 				 * keep ioapic_handled_vectors synchronized.
 				 */
 				irq.dest_id = old_dest_id;
-				irq.dest_mode = old_dest_mode;
+				irq.dest_mode =
+				    kvm_lapic_irq_dest_mode(
+					!!e->fields.dest_mode);
 				kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq,
 							 &vcpu_bitmap);
 			}
@@ -369,7 +372,7 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
 
 	irqe.dest_id = entry->fields.dest_id;
 	irqe.vector = entry->fields.vector;
-	irqe.dest_mode = entry->fields.dest_mode;
+	irqe.dest_mode = kvm_lapic_irq_dest_mode(!!entry->fields.dest_mode);
 	irqe.trig_mode = entry->fields.trig_mode;
 	irqe.delivery_mode = entry->fields.delivery_mode << 8;
 	irqe.level = 1;
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 8ecd48d31800..22108ed66a76 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -52,8 +52,8 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
 	unsigned long dest_vcpu_bitmap[BITS_TO_LONGS(KVM_MAX_VCPUS)];
 	unsigned int dest_vcpus = 0;
 
-	if (irq->dest_mode == 0 && irq->dest_id == 0xff &&
-			kvm_lowest_prio_delivery(irq)) {
+	if (irq->dest_mode == APIC_DEST_PHYSICAL &&
+	    irq->dest_id == 0xff && kvm_lowest_prio_delivery(irq)) {
 		printk(KERN_INFO "kvm: apic: phys broadcast and lowest prio\n");
 		irq->delivery_mode = APIC_DM_FIXED;
 	}
@@ -114,7 +114,8 @@ void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
 		irq->dest_id |= MSI_ADDR_EXT_DEST_ID(e->msi.address_hi);
 	irq->vector = (e->msi.data &
 			MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
-	irq->dest_mode = (1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo;
+	irq->dest_mode = kvm_lapic_irq_dest_mode(
+	    !!((1 << MSI_ADDR_DEST_MODE_SHIFT) & e->msi.address_lo));
 	irq->trig_mode = (1 << MSI_DATA_TRIGGER_SHIFT) & e->msi.data;
 	irq->delivery_mode = e->msi.data & 0x700;
 	irq->msi_redir_hint = ((e->msi.address_lo
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3ed167e039e5..3b00d662dc14 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7356,7 +7356,7 @@ static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
 	struct kvm_lapic_irq lapic_irq;
 
 	lapic_irq.shorthand = 0;
-	lapic_irq.dest_mode = 0;
+	lapic_irq.dest_mode = APIC_DEST_PHYSICAL;
 	lapic_irq.level = 0;
 	lapic_irq.dest_id = apicid;
 	lapic_irq.msi_redir_hint = false;
-- 
2.21.0


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 19:07 [PATCH v5 0/6] KVM: X86: Cleanups on dest_mode and headers Peter Xu
2019-12-04 19:07 ` [PATCH v5 1/6] KVM: X86: Fix kvm_bitmap_or_dest_vcpus() to use irq shorthand Peter Xu
2019-12-04 19:07 ` [PATCH v5 2/6] KVM: X86: Move irrelevant declarations out of ioapic.h Peter Xu
2019-12-04 19:07 ` Peter Xu [this message]
2019-12-04 19:07 ` [PATCH v5 4/6] KVM: X86: Drop KVM_APIC_SHORT_MASK and KVM_APIC_DEST_MASK Peter Xu
2019-12-04 19:07 ` [PATCH v5 5/6] KVM: X86: Fix callers of kvm_apic_match_dest() to use correct macros Peter Xu
2019-12-04 19:07 ` [PATCH v5 6/6] KVM: X86: Conert the last users of "shorthand = 0" to use macros Peter Xu
2019-12-05 12:43 ` [PATCH v5 0/6] KVM: X86: Cleanups on dest_mode and headers Paolo Bonzini

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