diff options
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/pci/vfio_pci_config.c | 34 | ||||
| -rw-r--r-- | drivers/vfio/pci/vfio_pci_private.h | 4 |
2 files changed, 34 insertions, 4 deletions
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c index fe2b470d7ec6..88dc646c0144 100644 --- a/drivers/vfio/pci/vfio_pci_config.c +++ b/drivers/vfio/pci/vfio_pci_config.c @@ -33,9 +33,8 @@ #define PCI_CFG_SPACE_SIZE 256 -/* Useful "pseudo" capabilities */ +/* Fake capability ID for standard config space */ #define PCI_CAP_ID_BASIC 0 -#define PCI_CAP_ID_INVALID 0xFF #define is_bar(offset) \ ((offset >= PCI_BASE_ADDRESS_0 && offset < PCI_BASE_ADDRESS_5 + 4) || \ @@ -301,6 +300,23 @@ static int vfio_raw_config_read(struct vfio_pci_device *vdev, int pos, return count; } +/* Virt access uses only virtualization */ +static int vfio_virt_config_write(struct vfio_pci_device *vdev, int pos, + int count, struct perm_bits *perm, + int offset, __le32 val) +{ + memcpy(vdev->vconfig + pos, &val, count); + return count; +} + +static int vfio_virt_config_read(struct vfio_pci_device *vdev, int pos, + int count, struct perm_bits *perm, + int offset, __le32 *val) +{ + memcpy(val, vdev->vconfig + pos, count); + return count; +} + /* Default capability regions to read-only, no-virtualization */ static struct perm_bits cap_perms[PCI_CAP_ID_MAX + 1] = { [0 ... PCI_CAP_ID_MAX] = { .readfn = vfio_direct_config_read } @@ -319,6 +335,11 @@ static struct perm_bits unassigned_perms = { .writefn = vfio_raw_config_write }; +static struct perm_bits virt_perms = { + .readfn = vfio_virt_config_read, + .writefn = vfio_virt_config_write +}; + static void free_perm_bits(struct perm_bits *perm) { kfree(perm->virt); @@ -1332,6 +1353,8 @@ static int vfio_cap_init(struct vfio_pci_device *vdev) pos + i, map[pos + i], cap); } + BUILD_BUG_ON(PCI_CAP_ID_MAX >= PCI_CAP_ID_INVALID_VIRT); + memset(map + pos, cap, len); ret = vfio_fill_vconfig_bytes(vdev, pos, len); if (ret) @@ -1419,9 +1442,9 @@ static int vfio_ecap_init(struct vfio_pci_device *vdev) /* * Even though ecap is 2 bytes, we're currently a long way * from exceeding 1 byte capabilities. If we ever make it - * up to 0xFF we'll need to up this to a two-byte, byte map. + * up to 0xFE we'll need to up this to a two-byte, byte map. */ - BUILD_BUG_ON(PCI_EXT_CAP_ID_MAX >= PCI_CAP_ID_INVALID); + BUILD_BUG_ON(PCI_EXT_CAP_ID_MAX >= PCI_CAP_ID_INVALID_VIRT); memset(map + epos, ecap, len); ret = vfio_fill_vconfig_bytes(vdev, epos, len); @@ -1597,6 +1620,9 @@ static ssize_t vfio_config_do_rw(struct vfio_pci_device *vdev, char __user *buf, if (cap_id == PCI_CAP_ID_INVALID) { perm = &unassigned_perms; cap_start = *ppos; + } else if (cap_id == PCI_CAP_ID_INVALID_VIRT) { + perm = &virt_perms; + cap_start = *ppos; } else { if (*ppos >= PCI_CFG_SPACE_SIZE) { WARN_ON(cap_id > PCI_EXT_CAP_ID_MAX); diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h index 0710bda5ae2c..b1e403235feb 100644 --- a/drivers/vfio/pci/vfio_pci_private.h +++ b/drivers/vfio/pci/vfio_pci_private.h @@ -25,6 +25,10 @@ #define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT) #define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1) +/* Special capability IDs predefined access */ +#define PCI_CAP_ID_INVALID 0xFF /* default raw access */ +#define PCI_CAP_ID_INVALID_VIRT 0xFE /* default virt access */ + struct vfio_pci_irq_ctx { struct eventfd_ctx *trigger; struct virqfd *unmask; |