Last month the vector management code was reworked, and as a result of the
changes, e.g. commit 22d0b12f3560 ("genirq/irqdomain: Add force
reactivation flag to irq domains"), commit 4900be83602b ("x86/vector/msi:
Switch to global reservation mode") etc, now we must add this new flag
MSI_FLAG_MUST_REACTIVATE when calling pci_msi_create_irq_domain() on x86,
otherwise Hyper-V PCIe pass-through can't work, and we get:
"spurious APIC interrupt through vector ff on CPU#0, should never happen",
this is because no valid MSI/MSI-X vector is allocated.Signed-off-by: Dexuan Cui <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: K. Y. Srinivasan <[email protected]> Cc: Haiyang Zhang <[email protected]> Cc: Stephen Hemminger <[email protected]> --- Currently the "reservation mode" patchset has not been in Linus's tree yet, so today's mainline hasn't shown the issue, but today's linux-next has shown the issue (PCIe pass-through on Hyper-V can't work). I think any caller of pci_msi_create_irq_domain() that runs on x86 needs to be updated, but besides pci-hyper I'm not sure which callers run on x86. drivers/pci/host/pci-hyperv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index 0fe3ea1..35a7683 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -1196,7 +1196,8 @@ static int hv_pcie_init_irq_domain(struct hv_pcibus_device *hbus) hbus->msi_info.ops = &hv_msi_ops; hbus->msi_info.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_MULTI_PCI_MSI | - MSI_FLAG_PCI_MSIX); + MSI_FLAG_PCI_MSIX | + MSI_FLAG_MUST_REACTIVATE); hbus->msi_info.handler = handle_edge_irq; hbus->msi_info.handler_name = "edge"; hbus->msi_info.data = hbus; -- 2.7.4 _______________________________________________ devel mailing list [email protected] http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
