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pci,virtio

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This further optimizes MSIX handling in virtio-pci.
 Also included is pci cleanup by Paolo, and pci device
 assignment fix by Alex.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'mst/tags/for_anthony' into staging

pci,virtio

This further optimizes MSIX handling in virtio-pci.
Also included is pci cleanup by Paolo, and pci device
assignment fix by Alex.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

* mst/tags/for_anthony:
  pci-assign: Enable MSIX on device to match guest
  pci: use constants for devices under the 1B36 device ID, document them
  ivshmem: use symbolic constant for PCI ID, add to pci-ids.txt
  virtio-9p: use symbolic constant, add to pci-ids.txt
  reorganize pci-ids.txt
  docs: move pci-ids.txt to docs/specs/
  vhost: backend masking support
  vhost: set started flag while start is in progress
  virtio-net: set/clear vhost_started in reverse order
  virtio: backend virtqueue notifier masking
  virtio-pci: cache msix messages
  kvm: add stub for update msi route
  msix: add api to access msix message
  virtio: don't waste irqfds on control vqs
This commit is contained in:
Anthony Liguori 2013-01-14 10:23:50 -06:00
commit 8e9a8681dd
19 changed files with 438 additions and 101 deletions
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17
hw/kvm/pci-assign.c
View file

@ -1031,6 +1031,19 @@ static bool assigned_dev_msix_masked(MSIXTableEntry *entry)
return (entry->ctrl & cpu_to_le32(0x1)) != 0;
}
/*
* When MSI-X is first enabled the vector table typically has all the
* vectors masked, so we can't use that as the obvious test to figure out
* how many vectors to initially enable. Instead we look at the data field
* because this is what worked for pci-assign for a long time. This makes
* sure the physical MSI-X state tracks the guest's view, which is important
* for some VF/PF and PF/fw communication channels.
*/
static bool assigned_dev_msix_skipped(MSIXTableEntry *entry)
{
return !entry->data;
}
static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
{
AssignedDevice *adev = DO_UPCAST(AssignedDevice, dev, pci_dev);
@ -1041,7 +1054,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
/* Get the usable entry number for allocating */
for (i = 0; i < adev->msix_max; i++, entry++) {
if (assigned_dev_msix_masked(entry)) {
if (assigned_dev_msix_skipped(entry)) {
continue;
}
entries_nr++;
@ -1070,7 +1083,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev)
for (i = 0; i < adev->msix_max; i++, entry++) {
adev->msi_virq[i] = -1;
if (assigned_dev_msix_masked(entry)) {
if (assigned_dev_msix_skipped(entry)) {
continue;
}