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virtio_pci: modern driver

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Lightly tested against qemu.

One thing *not* implemented here is separate mappings
for descriptor/avail/used rings. That's nice to have,
will be done later after we have core support.

This also exposes the PCI layout to userspace, and
adds macros for PCI layout offsets:

QEMU wants it, so why not?  Trust, but verify.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin
2014-12-11 13:59:51 +02:00
committed by Rusty Russell
parent 71d70c266c
commit 1fcf0512c9
5 changed files with 625 additions and 10 deletions
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7
include/uapi/linux/virtio_pci.h
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@@ -117,10 +117,11 @@ struct virtio_pci_cap {
__u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
__u8 cap_next; /* Generic PCI field: next ptr. */
__u8 cap_len; /* Generic PCI field: capability length */
__u8 type_and_bar; /* Upper 3 bits: bar.
* Lower 3 is VIRTIO_PCI_CAP_*_CFG. */
__u8 cfg_type; /* Identifies the structure. */
__u8 bar; /* Where to find it. */
__u8 padding[3]; /* Pad to full dword. */
__le32 offset; /* Offset within bar. */
__le32 length; /* Length. */
__le32 length; /* Length of the structure, in bytes. */
};
#define VIRTIO_PCI_CAP_BAR_SHIFT 5