IOMMU: add phantom function support

Apart from generating device context entries for the base function,
all phantom functions also need context entries to be generated for
them.

In order to distinguish different use cases, a variant of
pci_get_pdev() is being introduced that, even when passed a phantom
function number, would return the underlying actual device.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: "Zhang, Xiantao" <xiantao.zhang@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 7b550a3508..9724bb29c8 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -63,6 +63,8 @@ struct pci_dev {
     const u8 bus;
     const u8 devfn;
 
+    u8 phantom_stride;
+
     enum pdev_type {
         DEV_TYPE_PCI_UNKNOWN,
         DEV_TYPE_PCIe_ENDPOINT,
@@ -114,6 +116,7 @@ int pci_ro_device(int seg, int bus, int devfn);
 void arch_pci_ro_device(int seg, int bdf);
 int pci_hide_device(int bus, int devfn);
 struct pci_dev *pci_get_pdev(int seg, int bus, int devfn);
+struct pci_dev *pci_get_real_pdev(int seg, int bus, int devfn);
 struct pci_dev *pci_get_pdev_by_domain(
     struct domain *, int seg, int bus, int devfn);
 void pci_check_disable_device(u16 seg, u8 bus, u8 devfn);