Commit Graph

4 Commits

Author SHA1 Message Date
jhb
3f6ca218c6 Enhance the support for PCI legacy INTx interrupts and enable them in
the virtio backends.
- Add a new ioctl to export the count of pins on the I/O APIC from vmm
  to the hypervisor.
- Use pins on the I/O APIC >= 16 for PCI interrupts leaving 0-15 for
  ISA interrupts.
- Populate the MP Table with I/O interrupt entries for any PCI INTx
  interrupts.
- Create a _PRT table under the PCI root bridge in ACPI to route any
  PCI INTx interrupts appropriately.
- Track which INTx interrupts are in use per-slot so that functions
  that share a slot attempt to distribute their INTx interrupts across
  the four available pins.
- Implicitly mask INTx interrupts if either MSI or MSI-X is enabled
  and when the INTx DIS bit is set in a function's PCI command register.
  Either assert or deassert the associated I/O APIC pin when the
  state of one of those conditions changes.
- Add INTx support to the virtio backends.
- Always advertise the MSI capability in the virtio backends.

Submitted by:	neel (7)
Reviewed by:	neel
MFC after:	2 weeks
2014-01-29 14:56:48 +00:00
grehan
bee988f084 Fix issue with the virtio descriptor region being truncated
if it was above 4GB. This was seen with CentOS 6.5 guests with
large RAM, since the block drivers are loaded late in the
boot sequence and end up allocating descriptor memory from
high addresses.

Reported by:	Michael Dexter
MFC after:	3 days
2014-01-09 07:17:21 +00:00
grehan
6f381c7c57 Pass the number of supported vectors to pci_emul_add_msicap() and
not the actual PCI BAR number.

Reviewed by:	neel
Approved by:	re@ (blanket)
2013-09-17 18:42:13 +00:00
grehan
a6cf66c6cf Major rework of the virtio code. Split out common parts, and modify
the net/block devices accordingly.

Submitted by:	Chris Torek   torek at torek dot net
Reviewed by:	grehan
2013-07-17 23:37:33 +00:00