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

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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>
This commit is contained in:
Laurent Vivier
2008-05-30 16:05:53 +02:00
committed by Avi Kivity
parent 131d82791b
commit 92760499d0
9 changed files with 40 additions and 25 deletions
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28
arch/x86/kvm/x86.c
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@@ -1797,13 +1797,14 @@ static void kvm_init_msr_list(void)
* Only apic need an MMIO device hook, so shortcut now..
*/
static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
gpa_t addr)
gpa_t addr, int len,
int is_write)
{
struct kvm_io_device *dev;
if (vcpu->arch.apic) {
dev = &vcpu->arch.apic->dev;
if (dev->in_range(dev, addr))
if (dev->in_range(dev, addr, len, is_write))
return dev;
}
return NULL;
@@ -1811,13 +1812,15 @@ static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
gpa_t addr)
gpa_t addr, int len,
int is_write)
{
struct kvm_io_device *dev;
dev = vcpu_find_pervcpu_dev(vcpu, addr);
dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
if (dev == NULL)
dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
is_write);
return dev;
}
@@ -1885,7 +1888,7 @@ mmio:
* Is this MMIO handled locally?
*/
mutex_lock(&vcpu->kvm->lock);
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
if (mmio_dev) {
kvm_iodevice_read(mmio_dev, gpa, bytes, val);
mutex_unlock(&vcpu->kvm->lock);
@@ -1940,7 +1943,7 @@ mmio:
* Is this MMIO handled locally?
*/
mutex_lock(&vcpu->kvm->lock);
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
if (mmio_dev) {
kvm_iodevice_write(mmio_dev, gpa, bytes, val);
mutex_unlock(&vcpu->kvm->lock);
@@ -2317,9 +2320,10 @@ static void pio_string_write(struct kvm_io_device *pio_dev,
}
static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
gpa_t addr)
gpa_t addr, int len,
int is_write)
{
return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
}
int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
@@ -2351,7 +2355,7 @@ int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
kvm_x86_ops->skip_emulated_instruction(vcpu);
pio_dev = vcpu_find_pio_dev(vcpu, port);
pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
if (pio_dev) {
kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
complete_pio(vcpu);
@@ -2433,7 +2437,9 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
}
}
pio_dev = vcpu_find_pio_dev(vcpu, port);
pio_dev = vcpu_find_pio_dev(vcpu, port,
vcpu->arch.pio.cur_count,
!vcpu->arch.pio.in);
if (!vcpu->arch.pio.in) {
/* string PIO write */
ret = pio_copy_data(vcpu);