[PATCH kvmtool v3 18/22] pci: Switch trap handling to use MMIO handler

[Andre Przywara <andre.przywara@arm.com>]

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

Merge the existing _in and _out handlers to adhere to that MMIO
interface, and register these using the new registration function.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 pci.c | 82 +++++++++++++++++------------------------------------------
 1 file changed, 24 insertions(+), 58 deletions(-)

diff --git a/pci.c b/pci.c
index 2e2c0270..d6da79e0 100644
--- a/pci.c
+++ b/pci.c
@@ -87,29 +87,16 @@ static void *pci_config_address_ptr(u16 port)
 	return base + offset;
 }
 
-static bool pci_config_address_out(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
+static void pci_config_address_mmio(struct kvm_cpu *vcpu, u64 addr, u8 *data,
+				    u32 len, u8 is_write, void *ptr)
 {
-	void *p = pci_config_address_ptr(port);
+	void *p = pci_config_address_ptr(addr);
 
-	memcpy(p, data, size);
-
-	return true;
-}
-
-static bool pci_config_address_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
-{
-	void *p = pci_config_address_ptr(port);
-
-	memcpy(data, p, size);
-
-	return true;
+	if (is_write)
+		memcpy(p, data, len);
+	else
+		memcpy(data, p, len);
 }
-
-static struct ioport_operations pci_config_address_ops = {
-	.io_in	= pci_config_address_in,
-	.io_out	= pci_config_address_out,
-};
-
 static bool pci_device_exists(u8 bus_number, u8 device_number, u8 function_number)
 {
 	union pci_config_address pci_config_address;
@@ -125,49 +112,27 @@ static bool pci_device_exists(u8 bus_number, u8 device_number, u8 function_numbe
 	return !IS_ERR_OR_NULL(device__find_dev(DEVICE_BUS_PCI, device_number));
 }
 
-static bool pci_config_data_out(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
-{
-	union pci_config_address pci_config_address;
-
-	if (size > 4)
-		size = 4;
-
-	pci_config_address.w = ioport__read32(&pci_config_address_bits);
-	/*
-	 * If someone accesses PCI configuration space offsets that are not
-	 * aligned to 4 bytes, it uses ioports to signify that.
-	 */
-	pci_config_address.reg_offset = port - PCI_CONFIG_DATA;
-
-	pci__config_wr(vcpu->kvm, pci_config_address, data, size);
-
-	return true;
-}
-
-static bool pci_config_data_in(struct ioport *ioport, struct kvm_cpu *vcpu, u16 port, void *data, int size)
+static void pci_config_data_mmio(struct kvm_cpu *vcpu, u64 addr, u8 *data,
+				 u32 len, u8 is_write, void *kvm)
 {
 	union pci_config_address pci_config_address;
 
-	if (size > 4)
-		size = 4;
+	if (len > 4)
+		len = 4;
 
 	pci_config_address.w = ioport__read32(&pci_config_address_bits);
 	/*
 	 * If someone accesses PCI configuration space offsets that are not
 	 * aligned to 4 bytes, it uses ioports to signify that.
 	 */
-	pci_config_address.reg_offset = port - PCI_CONFIG_DATA;
+	pci_config_address.reg_offset = addr - PCI_CONFIG_DATA;
 
-	pci__config_rd(vcpu->kvm, pci_config_address, data, size);
-
-	return true;
+	if (is_write)
+		pci__config_wr(vcpu->kvm, pci_config_address, data, len);
+	else
+		pci__config_rd(vcpu->kvm, pci_config_address, data, len);
 }
 
-static struct ioport_operations pci_config_data_ops = {
-	.io_in	= pci_config_data_in,
-	.io_out	= pci_config_data_out,
-};
-
 static int pci_activate_bar(struct kvm *kvm, struct pci_device_header *pci_hdr,
 			    int bar_num)
 {
@@ -512,11 +477,12 @@ int pci__init(struct kvm *kvm)
 {
 	int r;
 
-	r = ioport__register(kvm, PCI_CONFIG_DATA + 0, &pci_config_data_ops, 4, NULL);
+	r = kvm__register_pio(kvm, PCI_CONFIG_DATA, 4,
+				 pci_config_data_mmio, NULL);
 	if (r < 0)
 		return r;
-
-	r = ioport__register(kvm, PCI_CONFIG_ADDRESS + 0, &pci_config_address_ops, 4, NULL);
+	r = kvm__register_pio(kvm, PCI_CONFIG_ADDRESS, 4,
+				 pci_config_address_mmio, NULL);
 	if (r < 0)
 		goto err_unregister_data;
 
@@ -528,17 +494,17 @@ int pci__init(struct kvm *kvm)
 	return 0;
 
 err_unregister_addr:
-	ioport__unregister(kvm, PCI_CONFIG_ADDRESS);
+	kvm__deregister_pio(kvm, PCI_CONFIG_ADDRESS);
 err_unregister_data:
-	ioport__unregister(kvm, PCI_CONFIG_DATA);
+	kvm__deregister_pio(kvm, PCI_CONFIG_DATA);
 	return r;
 }
 dev_base_init(pci__init);
 
 int pci__exit(struct kvm *kvm)
 {
-	ioport__unregister(kvm, PCI_CONFIG_DATA);
-	ioport__unregister(kvm, PCI_CONFIG_ADDRESS);
+	kvm__deregister_pio(kvm, PCI_CONFIG_DATA);
+	kvm__deregister_pio(kvm, PCI_CONFIG_ADDRESS);
 
 	return 0;
 }
-- 
2.17.5