[PATCH v3 03/15] pcie: Add a helper to the SR/IOV API

[Lukasz Maniak <lukasz.maniak@linux.intel.com>]

From: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>

Convenience function for retrieving the PCIDevice object of the N-th VF.

Signed-off-by: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>
Reviewed-by: Knut Omang <knuto@ifi.uio.no>
---
 hw/pci/pcie_sriov.c         | 10 +++++++++-
 include/hw/pci/pcie_sriov.h |  5 +++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pcie_sriov.c b/hw/pci/pcie_sriov.c
index 501a1ff433..be8c907e06 100644
--- a/hw/pci/pcie_sriov.c
+++ b/hw/pci/pcie_sriov.c
@@ -280,8 +280,16 @@ uint16_t pcie_sriov_vf_number(PCIDevice *dev)
     return dev->exp.sriov_vf.vf_number;
 }
 
-
 PCIDevice *pcie_sriov_get_pf(PCIDevice *dev)
 {
     return dev->exp.sriov_vf.pf;
 }
+
+PCIDevice *pcie_sriov_get_vf_at_index(PCIDevice *dev, int n)
+{
+    assert(!pci_is_vf(dev));
+    if (n < dev->exp.sriov_pf.num_vfs) {
+        return dev->exp.sriov_pf.vf[n];
+    }
+    return NULL;
+}
diff --git a/include/hw/pci/pcie_sriov.h b/include/hw/pci/pcie_sriov.h
index 0974f00054..cd2aebd3a6 100644
--- a/include/hw/pci/pcie_sriov.h
+++ b/include/hw/pci/pcie_sriov.h
@@ -64,4 +64,9 @@ uint16_t pcie_sriov_vf_number(PCIDevice *dev);
  */
 PCIDevice *pcie_sriov_get_pf(PCIDevice *dev);
 
+/* Get the n-th VF of this physical function - only valid for PF.
+ * Returns NULL if index is invalid
+ */
+PCIDevice *pcie_sriov_get_vf_at_index(PCIDevice *dev, int n);
+
 #endif /* QEMU_PCIE_SRIOV_H */
-- 
2.25.1