KVM: remove in_range from io devices
This changes bus accesses to use high-level kvm_io_bus_read/kvm_io_bus_write
functions. in_range now becomes unused so it is removed from device ops in
favor of read/write callbacks performing range checks internally.
This allows aliasing (mostly for in-kernel virtio), as well as better error
handling by making it possible to pass errors up to userspace.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 2e02865..265a765 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -546,18 +546,27 @@
return container_of(dev, struct kvm_lapic, dev);
}
-static void apic_mmio_read(struct kvm_io_device *this,
- gpa_t address, int len, void *data)
+static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
+{
+ return apic_hw_enabled(apic) &&
+ addr >= apic->base_address &&
+ addr < apic->base_address + LAPIC_MMIO_LENGTH;
+}
+
+static int apic_mmio_read(struct kvm_io_device *this,
+ gpa_t address, int len, void *data)
{
struct kvm_lapic *apic = to_lapic(this);
unsigned int offset = address - apic->base_address;
unsigned char alignment = offset & 0xf;
u32 result;
+ if (!apic_mmio_in_range(apic, address))
+ return -EOPNOTSUPP;
if ((alignment + len) > 4) {
printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
(unsigned long)address, len);
- return;
+ return 0;
}
result = __apic_read(apic, offset & ~0xf);
@@ -574,6 +583,7 @@
"should be 1,2, or 4 instead\n", len);
break;
}
+ return 0;
}
static void update_divide_count(struct kvm_lapic *apic)
@@ -629,13 +639,15 @@
apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
}
-static void apic_mmio_write(struct kvm_io_device *this,
- gpa_t address, int len, const void *data)
+static int apic_mmio_write(struct kvm_io_device *this,
+ gpa_t address, int len, const void *data)
{
struct kvm_lapic *apic = to_lapic(this);
unsigned int offset = address - apic->base_address;
unsigned char alignment = offset & 0xf;
u32 val;
+ if (!apic_mmio_in_range(apic, address))
+ return -EOPNOTSUPP;
/*
* APIC register must be aligned on 128-bits boundary.
@@ -646,7 +658,7 @@
/* Don't shout loud, $infamous_os would cause only noise. */
apic_debug("apic write: bad size=%d %lx\n",
len, (long)address);
- return;
+ return 0;
}
val = *(u32 *) data;
@@ -729,7 +741,7 @@
hrtimer_cancel(&apic->lapic_timer.timer);
apic_set_reg(apic, APIC_TMICT, val);
start_apic_timer(apic);
- return;
+ return 0;
case APIC_TDCR:
if (val & 4)
@@ -743,22 +755,7 @@
offset);
break;
}
-
-}
-
-static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
- int len, int size)
-{
- struct kvm_lapic *apic = to_lapic(this);
- int ret = 0;
-
-
- if (apic_hw_enabled(apic) &&
- (addr >= apic->base_address) &&
- (addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
- ret = 1;
-
- return ret;
+ return 0;
}
void kvm_free_lapic(struct kvm_vcpu *vcpu)
@@ -938,7 +935,6 @@
static const struct kvm_io_device_ops apic_mmio_ops = {
.read = apic_mmio_read,
.write = apic_mmio_write,
- .in_range = apic_mmio_range,
};
int kvm_create_lapic(struct kvm_vcpu *vcpu)