[PATCH kvmtool 18/21] pci: 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.

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>
---
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;
}
--
2.17.1