KVM: kvm_io_device: extend in_range() to manage len and write attribute

Modify member in_range() of structure kvm_io_device to pass length and the type
of the I/O (write or read).

This modification allows to use kvm_io_device with coalesced MMIO.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>

3 files changed, 10 insertions, 6 deletions

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index d0c668c6959e..c0d22870ee9c 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -307,7 +307,8 @@ void kvm_ioapic_update_eoi(struct kvm *kvm, int vector)
                         __kvm_ioapic_update_eoi(ioapic, i);
 }
 
-static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr)
+static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
+                           int len, int is_write)
 {
         struct kvm_ioapic *ioapic = (struct kvm_ioapic *)this->private;
 
diff --git a/virt/kvm/iodev.h b/virt/kvm/iodev.h
index c14e642027b2..55e8846ac3a6 100644
--- a/virt/kvm/iodev.h
+++ b/virt/kvm/iodev.h
@@ -27,7 +27,8 @@ struct kvm_io_device {
                       gpa_t addr,
                       int len,
                       const void *val);
-        int (*in_range)(struct kvm_io_device *this, gpa_t addr);
+        int (*in_range)(struct kvm_io_device *this, gpa_t addr, int len,
+                        int is_write);
         void (*destructor)(struct kvm_io_device *this);
 
         void             *private;
@@ -49,9 +50,10 @@ static inline void kvm_iodevice_write(struct kvm_io_device *dev,
         dev->write(dev, addr, len, val);
 }
 
-static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
+static inline int kvm_iodevice_inrange(struct kvm_io_device *dev,
+                                       gpa_t addr, int len, int is_write)
 {
-        return dev->in_range(dev, addr);
+        return dev->in_range(dev, addr, len, is_write);
 }
 
 static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 83a0e5ce6037..9330fad2b918 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1350,14 +1350,15 @@ void kvm_io_bus_destroy(struct kvm_io_bus *bus)
         }
 }
 
-struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
+struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
+                                          gpa_t addr, int len, int is_write)
 {
         int i;
 
         for (i = 0; i < bus->dev_count; i++) {
                 struct kvm_io_device *pos = bus->devs[i];
 
-                if (pos->in_range(pos, addr))
+                if (pos->in_range(pos, addr, len, is_write))
                         return pos;
         }