[PATCH kvmtool 06/16] pci: Fix ioport allocation size

[Julien Thierry <julien.thierry@arm.com>]

The PCI Local Bus Specification, Rev. 3.0,
Section 6.2.5.1. "Address Maps" states:
"Devices that map control functions into I/O Space must not consume more
than 256 bytes per I/O Base Address register."

Yet all the PCI devices allocate IO ports of IOPORT_SIZE (= 1024 bytes).

Fix this by having PCI devices use 256 bytes ports for IO BARs.

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
---
 hw/pci-shmem.c       |  4 ++--
 hw/vesa.c            |  4 ++--
 include/kvm/ioport.h |  1 -
 pci.c                |  2 +-
 virtio/pci.c         | 14 +++++++-------
 5 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/hw/pci-shmem.c b/hw/pci-shmem.c
index a0c5ba8..2e1474b 100644
--- a/hw/pci-shmem.c
+++ b/hw/pci-shmem.c
@@ -357,8 +357,8 @@ int pci_shmem__init(struct kvm *kvm)
 		return 0;
 
 	/* Register MMIO space for MSI-X */
-	r = pci_get_io_port_block(IOPORT_SIZE);
-	r = ioport__register(kvm, r, &shmem_pci__io_ops, IOPORT_SIZE, NULL);
+	r = pci_get_io_port_block(PCI_IO_SIZE);
+	r = ioport__register(kvm, r, &shmem_pci__io_ops, PCI_IO_SIZE, NULL);
 	if (r < 0)
 		return r;
 	ivshmem_registers = (u16)r;
diff --git a/hw/vesa.c b/hw/vesa.c
index 404a8a3..71935d5 100644
--- a/hw/vesa.c
+++ b/hw/vesa.c
@@ -60,8 +60,8 @@ struct framebuffer *vesa__init(struct kvm *kvm)
 
 	if (!kvm->cfg.vnc && !kvm->cfg.sdl && !kvm->cfg.gtk)
 		return NULL;
-	r = pci_get_io_space_block(IOPORT_SIZE);
-	r = ioport__register(kvm, r, &vesa_io_ops, IOPORT_SIZE, NULL);
+	r = pci_get_io_space_block(PCI_IO_SIZE);
+	r = ioport__register(kvm, r, &vesa_io_ops, PCI_IO_SIZE, NULL);
 	if (r < 0)
 		return ERR_PTR(r);
 
diff --git a/include/kvm/ioport.h b/include/kvm/ioport.h
index b10fcd5..8c86b71 100644
--- a/include/kvm/ioport.h
+++ b/include/kvm/ioport.h
@@ -14,7 +14,6 @@
 
 /* some ports we reserve for own use */
 #define IOPORT_DBG			0xe0
-#define IOPORT_SIZE			0x400
 
 struct kvm;
 
diff --git a/pci.c b/pci.c
index cd749db..228a628 100644
--- a/pci.c
+++ b/pci.c
@@ -23,7 +23,7 @@ static u16 io_port_blocks		= PCI_IOPORT_START;
 
 u16 pci_get_io_port_block(u32 size)
 {
-	u16 port = ALIGN(io_port_blocks, IOPORT_SIZE);
+	u16 port = ALIGN(io_port_blocks, PCI_IO_SIZE);
 	io_port_blocks = port + size;
 	return port;
 }
diff --git a/virtio/pci.c b/virtio/pci.c
index c8e16dd..5a6c0d0 100644
--- a/virtio/pci.c
+++ b/virtio/pci.c
@@ -406,7 +406,7 @@ static void virtio_pci__io_mmio_callback(struct kvm_cpu *vcpu,
 {
 	struct virtio_pci *vpci = ptr;
 	int direction = is_write ? KVM_EXIT_IO_OUT : KVM_EXIT_IO_IN;
-	u16 port = vpci->port_addr + (addr & (IOPORT_SIZE - 1));
+	u16 port = vpci->port_addr + (addr & (PCI_IO_SIZE - 1));
 
 	kvm__emulate_io(vcpu, port, data, direction, len, 1);
 }
@@ -420,14 +420,14 @@ int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev,
 	vpci->kvm = kvm;
 	vpci->dev = dev;
 
-	r = pci_get_io_port_block(IOPORT_SIZE);
-	r = ioport__register(kvm, r, &virtio_pci__io_ops, IOPORT_SIZE, vdev);
+	r = pci_get_io_port_block(PCI_IO_SIZE);
+	r = ioport__register(kvm, r, &virtio_pci__io_ops, PCI_IO_SIZE, vdev);
 	if (r < 0)
 		return r;
 	vpci->port_addr = (u16)r;
 
-	vpci->mmio_addr = pci_get_io_space_block(IOPORT_SIZE);
-	r = kvm__register_mmio(kvm, vpci->mmio_addr, IOPORT_SIZE, false,
+	vpci->mmio_addr = pci_get_io_space_block(PCI_IO_SIZE);
+	r = kvm__register_mmio(kvm, vpci->mmio_addr, PCI_IO_SIZE, false,
 			       virtio_pci__io_mmio_callback, vpci);
 	if (r < 0)
 		goto free_ioport;
@@ -457,8 +457,8 @@ int virtio_pci__init(struct kvm *kvm, void *dev, struct virtio_device *vdev,
 							| PCI_BASE_ADDRESS_SPACE_MEMORY),
 		.status			= cpu_to_le16(PCI_STATUS_CAP_LIST),
 		.capabilities		= (void *)&vpci->pci_hdr.msix - (void *)&vpci->pci_hdr,
-		.bar_size[0]		= cpu_to_le32(IOPORT_SIZE),
-		.bar_size[1]		= cpu_to_le32(IOPORT_SIZE),
+		.bar_size[0]		= cpu_to_le32(PCI_IO_SIZE),
+		.bar_size[1]		= cpu_to_le32(PCI_IO_SIZE),
 		.bar_size[2]		= cpu_to_le32(PCI_IO_SIZE*2),
 	};
 
-- 
1.9.1