[PATCH kvmtool 17/21] virtio: Switch trap handling to use MMIO handler

Andre Przywara
2020-12-10T19:05:00Z

With the planned retirement of the special ioport emulation code, we
need to provide an emulation function compatible with the MMIO prototype.

Adjust the existing MMIO callback routine to automatically determine
the region this trap came through, and call the existing I/O handlers.
Register the ioport region using the new registration function.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
virtio/pci.c | 42 ++++++++++--------------------------------
1 file changed, 10 insertions(+), 32 deletions(-)

diff --git a/virtio/pci.c b/virtio/pci.c
index 6eea6c68..49d3f4d5 100644
--- a/virtio/pci.c
+++ b/virtio/pci.c
@@ -178,15 +178,6 @@ static bool virtio_pci__data_in(struct kvm_cpu *vcpu, struct virtio_device *vdev
return ret;
}

-static bool virtio_pci__io_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
-{
- struct virtio_device *vdev = ioport->priv;
- struct virtio_pci *vpci = vdev->virtio;
- unsigned long offset = port - virtio_pci__port_addr(vpci);
-
- return virtio_pci__data_in(vcpu, vdev, offset, data, size);
-}
-
static void update_msix_map(struct virtio_pci *vpci,
struct msix_table *msix_entry, u32 vecnum)
{
@@ -334,20 +325,6 @@ static bool virtio_pci__data_out(struct kvm_cpu *vcpu, struct virtio_device *vde
return ret;
}

-static bool virtio_pci__io_out(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
-{
- struct virtio_device *vdev = ioport->priv;
- struct virtio_pci *vpci = vdev->virtio;
- unsigned long offset = port - virtio_pci__port_addr(vpci);
-
- return virtio_pci__data_out(vcpu, vdev, offset, data, size);
-}
-
-static struct ioport_operations virtio_pci__io_ops = {
- .io_in = virtio_pci__io_in,
- .io_out = virtio_pci__io_out,
-};
-
static void virtio_pci__msix_mmio_callback(struct kvm_cpu *vcpu,
u64 addr, u8 *data, u32 len,
u8 is_write, void *ptr)
@@ -455,12 +432,15 @@ static void virtio_pci__io_mmio_callback(struct kvm_cpu *vcpu,
{
struct virtio_device *vdev = ptr;
struct virtio_pci *vpci = vdev->virtio;
- u32 mmio_addr = virtio_pci__mmio_addr(vpci);
+ u32 base_addr = virtio_pci__mmio_addr(vpci);
+
+ if (addr < base_addr || addr >= base_addr + PCI_IO_SIZE)
+ base_addr = virtio_pci__port_addr(vpci);

if (!is_write)
- virtio_pci__data_in(vcpu, vdev, addr - mmio_addr, data, len);
+ virtio_pci__data_in(vcpu, vdev, addr - base_addr, data, len);
else
- virtio_pci__data_out(vcpu, vdev, addr - mmio_addr, data, len);
+ virtio_pci__data_out(vcpu, vdev, addr - base_addr, data, len);
}

static int virtio_pci__bar_activate(struct kvm *kvm,
@@ -478,10 +458,8 @@ static int virtio_pci__bar_activate(struct kvm *kvm,

switch (bar_num) {
case 0:
- r = ioport__register(kvm, bar_addr, &virtio_pci__io_ops,
- bar_size, vdev);
- if (r > 0)
- r = 0;
+ r = kvm__register_pio(kvm, bar_addr, bar_size,
+ virtio_pci__io_mmio_callback, vdev);
break;
case 1:
r = kvm__register_mmio(kvm, bar_addr, bar_size, false,
@@ -510,7 +488,7 @@ static int virtio_pci__bar_deactivate(struct kvm *kvm,

switch (bar_num) {
case 0:
- r = ioport__unregister(kvm, bar_addr);
+ r = kvm__deregister_pio(kvm, bar_addr);
break;
case 1:
case 2:
@@ -625,7 +603,7 @@ int virtio_pci__exit(struct kvm *kvm, struct virtio_device *vdev)
virtio_pci__reset(kvm, vdev);
kvm__deregister_mmio(kvm, virtio_pci__mmio_addr(vpci));
kvm__deregister_mmio(kvm, virtio_pci__msix_io_addr(vpci));
- ioport__unregister(kvm, virtio_pci__port_addr(vpci));
+ kvm__deregister_pio(kvm, virtio_pci__port_addr(vpci));

return 0;
}
--
2.17.1