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kvm: Fail virtio blk ioports by default

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This patch changes virtio block device ioports to fail by default and adds few
specific stubs to keep kernel booting still.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2010-08-15 17:17:43 +03:00
committed by Will Deacon
parent 984b7ae0ed
commit fbc2fbf9b9
2 changed files with 90 additions and 49 deletions
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blk-virtio.c
+70 -49
View File
@@ -6,12 +6,80 @@
#define VIRTIO_PCI_IOPORT_SIZE 24
struct device {
uint32_t guest_features;
uint8_t status;
};
static struct device device;
static bool blk_virtio_in(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
unsigned long offset;
offset = port - IOPORT_VIRTIO;
switch (offset) {
case VIRTIO_PCI_HOST_FEATURES:
ioport__write32(data, 0x00);
break;
case VIRTIO_PCI_GUEST_FEATURES:
case VIRTIO_PCI_QUEUE_PFN:
case VIRTIO_PCI_QUEUE_NUM:
case VIRTIO_PCI_QUEUE_SEL:
case VIRTIO_PCI_QUEUE_NOTIFY:
return false;
case VIRTIO_PCI_STATUS:
ioport__write8(data, device.status);
break;
case VIRTIO_PCI_ISR:
case VIRTIO_MSI_CONFIG_VECTOR:
default:
return false;
};
return true;
}
#include <stdio.h>
static bool blk_virtio_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
unsigned long offset;
offset = port - IOPORT_VIRTIO;
switch (offset) {
case VIRTIO_PCI_GUEST_FEATURES:
device.guest_features = ioport__read32(data);
break;
case VIRTIO_PCI_QUEUE_PFN:
case VIRTIO_PCI_QUEUE_SEL:
case VIRTIO_PCI_QUEUE_NOTIFY:
return false;
case VIRTIO_PCI_STATUS:
device.status = ioport__read8(data);
break;
case VIRTIO_MSI_CONFIG_VECTOR:
case VIRTIO_MSI_QUEUE_VECTOR:
default:
return false;
};
return true;
}
static struct ioport_operations blk_virtio_io_ops = {
.io_in = blk_virtio_in,
.io_out = blk_virtio_out,
};
#define PCI_VENDOR_ID_REDHAT_QUMRANET 0x1af4
#define PCI_DEVICE_ID_VIRTIO_BLK 0x1001
#define PCI_SUBSYSTEM_VENDOR_ID_REDHAT_QUMRANET 0x1af4
#define PCI_SUBSYSTEM_ID_VIRTIO_BLK 0x0002
static struct pci_device_header blk_virtio_device = {
static struct pci_device_header blk_virtio_pci_device = {
.vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
.device_id = PCI_DEVICE_ID_VIRTIO_BLK,
.header_type = PCI_HEADER_TYPE_NORMAL,
@@ -22,56 +90,9 @@ static struct pci_device_header blk_virtio_device = {
.bar[0] = IOPORT_VIRTIO | PCI_BASE_ADDRESS_SPACE_IO,
};
static bool blk_virtio_in(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
unsigned long offset;
offset = port - IOPORT_VIRTIO;
switch (offset) {
case VIRTIO_PCI_HOST_FEATURES:
case VIRTIO_PCI_GUEST_FEATURES:
case VIRTIO_PCI_QUEUE_PFN:
case VIRTIO_PCI_QUEUE_NUM:
case VIRTIO_PCI_QUEUE_SEL:
case VIRTIO_PCI_QUEUE_NOTIFY:
case VIRTIO_PCI_STATUS:
case VIRTIO_PCI_ISR:
case VIRTIO_MSI_CONFIG_VECTOR:
return true;
};
return false;
}
static bool blk_virtio_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
unsigned long offset;
offset = port - IOPORT_VIRTIO;
switch (offset) {
case VIRTIO_PCI_GUEST_FEATURES:
case VIRTIO_PCI_QUEUE_PFN:
case VIRTIO_PCI_QUEUE_SEL:
case VIRTIO_PCI_QUEUE_NOTIFY:
case VIRTIO_PCI_STATUS:
case VIRTIO_MSI_CONFIG_VECTOR:
case VIRTIO_MSI_QUEUE_VECTOR:
return true;
};
return false;
}
static struct ioport_operations blk_virtio_io_ops = {
.io_in = blk_virtio_in,
.io_out = blk_virtio_out,
};
void blk_virtio__init(void)
{
pci__register(&blk_virtio_device, 1);
pci__register(&blk_virtio_pci_device, 1);
ioport__register(IOPORT_VIRTIO, &blk_virtio_io_ops, VIRTIO_PCI_IOPORT_SIZE);
}
include/kvm/ioport.h
+20
View File
@@ -17,4 +17,24 @@ struct ioport_operations {
void ioport__register(uint16_t port, struct ioport_operations *ops, int count);
static inline uint8_t ioport__read8(uint8_t *data)
{
return *data;
}
static inline uint32_t ioport__read32(uint32_t *data)
{
return *data;
}
static inline void ioport__write8(uint8_t *data, uint8_t value)
{
*data = value;
}
static inline void ioport__write32(uint32_t *data, uint32_t value)
{
*data = value;
}
#endif /* KVM__IOPORT_H */