[PATCH 06/17] KVM: Extract generic irqchip logic into irqchip.c

Alexander Graf
2013-04-18T14:11:46Z

The current irq_comm.c file contains pieces of code that are generic
across different irqchip implementations, as well as code that is
fully IOAPIC specific.

Split the generic bits out into irqchip.c.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/x86/kvm/Makefile | 2 +-
include/trace/events/kvm.h | 12 +++-
virt/kvm/irq_comm.c | 118 ----------------------------------
virt/kvm/irqchip.c | 152 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 163 insertions(+), 121 deletions(-)
create mode 100644 virt/kvm/irqchip.c

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 04d3040..a797b8e 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -7,7 +7,7 @@ CFLAGS_vmx.o := -I.

kvm-y += $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \
coalesced_mmio.o irq_comm.o eventfd.o \
- assigned-dev.o)
+ assigned-dev.o irqchip.o)
kvm-$(CONFIG_IOMMU_API) += $(addprefix ../../../virt/kvm/, iommu.o)
kvm-$(CONFIG_KVM_ASYNC_PF) += $(addprefix ../../../virt/kvm/, async_pf.o)

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index 19911dd..7005d11 100644
--- a/include/trace/events/kvm.h
+++ b/include/trace/events/kvm.h
@@ -37,7 +37,7 @@ TRACE_EVENT(kvm_userspace_exit,
__entry->errno < 0 ? -__entry->errno : __entry->reason)
);

-#if defined(__KVM_HAVE_IRQ_LINE)
+#if defined(CONFIG_HAVE_KVM_IRQCHIP)
TRACE_EVENT(kvm_set_irq,
TP_PROTO(unsigned int gsi, int level, int irq_source_id),
TP_ARGS(gsi, level, irq_source_id),
@@ -122,6 +122,10 @@ TRACE_EVENT(kvm_msi_set_irq,
{KVM_IRQCHIP_PIC_SLAVE, "PIC slave"}, \
{KVM_IRQCHIP_IOAPIC, "IOAPIC"}

+#endif /* defined(__KVM_HAVE_IOAPIC) */
+
+#if defined(CONFIG_HAVE_KVM_IRQCHIP)
+
TRACE_EVENT(kvm_ack_irq,
TP_PROTO(unsigned int irqchip, unsigned int pin),
TP_ARGS(irqchip, pin),
@@ -136,14 +140,18 @@ TRACE_EVENT(kvm_ack_irq,
__entry->pin = pin;
),

+#ifdef kvm_irqchips
TP_printk("irqchip %s pin %u",
__print_symbolic(__entry->irqchip, kvm_irqchips),
__entry->pin)
+#else
+ TP_printk("irqchip %d pin %u", __entry->irqchip, __entry->pin)
+#endif
);

+#endif /* defined(CONFIG_HAVE_KVM_IRQCHIP) */

-#endif /* defined(__KVM_HAVE_IOAPIC) */

#define KVM_TRACE_MMIO_READ_UNSATISFIED 0
#define KVM_TRACE_MMIO_READ 1
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 7c0071d..d5008f4 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -151,59 +151,6 @@ static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e,
return -EWOULDBLOCK;
}

-int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
-{
- struct kvm_kernel_irq_routing_entry route;
-
- if (!irqchip_in_kernel(kvm) || msi->flags != 0)
- return -EINVAL;
-
- route.msi.address_lo = msi->address_lo;
- route.msi.address_hi = msi->address_hi;
- route.msi.data = msi->data;
-
- return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
-}
-
-/*
- * Return value:
- * < 0 Interrupt was ignored (masked or not delivered for other reasons)
- * = 0 Interrupt was coalesced (previous irq is still pending)
- * > 0 Number of CPUs interrupt was delivered to
- */
-int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
- bool line_status)
-{
- struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
- int ret = -1, i = 0;
- struct kvm_irq_routing_table *irq_rt;
-
- trace_kvm_set_irq(irq, level, irq_source_id);
-
- /* Not possible to detect if the guest uses the PIC or the
- * IOAPIC. So set the bit in both. The guest will ignore
- * writes to the unused one.
- */
- rcu_read_lock();
- irq_rt = rcu_dereference(kvm->irq_routing);
- if (irq < irq_rt->nr_rt_entries)
- hlist_for_each_entry(e, &irq_rt->map[irq], link)
- irq_set[i++] = *e;
- rcu_read_unlock();
-
- while(i--) {
- int r;
- r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
- line_status);
- if (r < 0)
- continue;
-
- ret = r + ((ret < 0) ? 0 : ret);
- }
-
- return ret;
-}
-
/*
* Deliver an IRQ in an atomic context if we can, or return a failure,
* user can retry in a process context.
@@ -241,63 +188,6 @@ int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level)
return ret;
}

-bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
-{
- struct kvm_irq_ack_notifier *kian;
- int gsi;
-
- rcu_read_lock();
- gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
- if (gsi != -1)
- hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
- link)
- if (kian->gsi = gsi) {
- rcu_read_unlock();
- return true;
- }
-
- rcu_read_unlock();
-
- return false;
-}
-EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
-
-void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
-{
- struct kvm_irq_ack_notifier *kian;
- int gsi;
-
- trace_kvm_ack_irq(irqchip, pin);
-
- rcu_read_lock();
- gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
- if (gsi != -1)
- hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
- link)
- if (kian->gsi = gsi)
- kian->irq_acked(kian);
- rcu_read_unlock();
-}
-
-void kvm_register_irq_ack_notifier(struct kvm *kvm,
- struct kvm_irq_ack_notifier *kian)
-{
- mutex_lock(&kvm->irq_lock);
- hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
- mutex_unlock(&kvm->irq_lock);
- kvm_vcpu_request_scan_ioapic(kvm);
-}
-
-void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
- struct kvm_irq_ack_notifier *kian)
-{
- mutex_lock(&kvm->irq_lock);
- hlist_del_init_rcu(&kian->link);
- mutex_unlock(&kvm->irq_lock);
- synchronize_rcu();
- kvm_vcpu_request_scan_ioapic(kvm);
-}
-
int kvm_request_irq_source_id(struct kvm *kvm)
{
unsigned long *bitmap = &kvm->arch.irq_sources_bitmap;
@@ -381,13 +271,6 @@ void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
rcu_read_unlock();
}

-void kvm_free_irq_routing(struct kvm *kvm)
-{
- /* Called only during vm destruction. Nobody can use the pointer
- at this stage */
- kfree(kvm->irq_routing);
-}
-
static int setup_routing_entry(struct kvm_irq_routing_table *rt,
struct kvm_kernel_irq_routing_entry *e,
const struct kvm_irq_routing_entry *ue)
@@ -451,7 +334,6 @@ out:
return r;
}

-
int kvm_set_irq_routing(struct kvm *kvm,
const struct kvm_irq_routing_entry *ue,
unsigned nr,
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
new file mode 100644
index 0000000..12f7f26
--- /dev/null
+++ b/virt/kvm/irqchip.c
@@ -0,0 +1,152 @@
+/*
+ * irqchip.c: Common API for in kernel interrupt controllers
+ * Copyright (c) 2007, Intel Corporation.
+ * Copyright 2010 Red Hat, Inc. and/or its affiliates.
+ * Copyright (c) 2013, Alexander Graf <agraf@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * This file is derived from virt/kvm/irq_comm.c.
+ *
+ * Authors:
+ * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
+ * Alexander Graf <agraf@suse.de>
+ */
+
+#include <linux/kvm_host.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+#include <trace/events/kvm.h>
+#include "irq.h"
+
+bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin)
+{
+ struct kvm_irq_ack_notifier *kian;
+ int gsi;
+
+ rcu_read_lock();
+ gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
+ if (gsi != -1)
+ hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
+ link)
+ if (kian->gsi = gsi) {
+ rcu_read_unlock();
+ return true;
+ }
+
+ rcu_read_unlock();
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(kvm_irq_has_notifier);
+
+void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
+{
+ struct kvm_irq_ack_notifier *kian;
+ int gsi;
+
+ trace_kvm_ack_irq(irqchip, pin);
+
+ rcu_read_lock();
+ gsi = rcu_dereference(kvm->irq_routing)->chip[irqchip][pin];
+ if (gsi != -1)
+ hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
+ link)
+ if (kian->gsi = gsi)
+ kian->irq_acked(kian);
+ rcu_read_unlock();
+}
+
+void kvm_register_irq_ack_notifier(struct kvm *kvm,
+ struct kvm_irq_ack_notifier *kian)
+{
+ mutex_lock(&kvm->irq_lock);
+ hlist_add_head_rcu(&kian->link, &kvm->irq_ack_notifier_list);
+ mutex_unlock(&kvm->irq_lock);
+#ifdef __KVM_HAVE_IOAPIC
+ kvm_vcpu_request_scan_ioapic(kvm);
+#endif
+}
+
+void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
+ struct kvm_irq_ack_notifier *kian)
+{
+ mutex_lock(&kvm->irq_lock);
+ hlist_del_init_rcu(&kian->link);
+ mutex_unlock(&kvm->irq_lock);
+ synchronize_rcu();
+#ifdef __KVM_HAVE_IOAPIC
+ kvm_vcpu_request_scan_ioapic(kvm);
+#endif
+}
+
+int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
+{
+ struct kvm_kernel_irq_routing_entry route;
+
+ if (!irqchip_in_kernel(kvm) || msi->flags != 0)
+ return -EINVAL;
+
+ route.msi.address_lo = msi->address_lo;
+ route.msi.address_hi = msi->address_hi;
+ route.msi.data = msi->data;
+
+ return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1, false);
+}
+
+/*
+ * Return value:
+ * < 0 Interrupt was ignored (masked or not delivered for other reasons)
+ * = 0 Interrupt was coalesced (previous irq is still pending)
+ * > 0 Number of CPUs interrupt was delivered to
+ */
+int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
+ bool line_status)
+{
+ struct kvm_kernel_irq_routing_entry *e, irq_set[KVM_NR_IRQCHIPS];
+ int ret = -1, i = 0;
+ struct kvm_irq_routing_table *irq_rt;
+
+ trace_kvm_set_irq(irq, level, irq_source_id);
+
+ /* Not possible to detect if the guest uses the PIC or the
+ * IOAPIC. So set the bit in both. The guest will ignore
+ * writes to the unused one.
+ */
+ rcu_read_lock();
+ irq_rt = rcu_dereference(kvm->irq_routing);
+ if (irq < irq_rt->nr_rt_entries)
+ hlist_for_each_entry(e, &irq_rt->map[irq], link)
+ irq_set[i++] = *e;
+ rcu_read_unlock();
+
+ while(i--) {
+ int r;
+ r = irq_set[i].set(&irq_set[i], kvm, irq_source_id, level,
+ line_status);
+ if (r < 0)
+ continue;
+
+ ret = r + ((ret < 0) ? 0 : ret);
+ }
+
+ return ret;
+}
+
+void kvm_free_irq_routing(struct kvm *kvm)
+{
+ /* Called only during vm destruction. Nobody can use the pointer
+ at this stage */
+ kfree(kvm->irq_routing);
+}
--
1.6.0.2