qemu/pci-Get-pasid-capability-from-vIOMMU.patch

From 494e0ace6c120af00b27a0cc1d4a478073654e35 Mon Sep 17 00:00:00 2001
From: Yi Liu <yi.l.liu@intel.com>
Date: Thu, 12 Sep 2024 00:33:13 -0700
Subject: [PATCH] pci: Get pasid capability from vIOMMU

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 hw/pci/pci.c         | 13 +++++++++++++
 include/hw/pci/pci.h | 13 +++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index d6f627aa51..447ef2b163 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2802,6 +2802,19 @@ void pci_device_unset_iommu_device(PCIDevice *dev)
     }
 }
 
+bool pci_device_get_pasid_cap(PCIDevice *dev)
+{
+    PCIBus *iommu_bus;
+
+    pci_device_get_iommu_bus_devfn(dev, &iommu_bus, NULL, NULL);
+    if (iommu_bus && iommu_bus->iommu_ops->get_pasid_cap) {
+        return iommu_bus->iommu_ops->get_pasid_cap(pci_get_bus(dev),
+                                                   iommu_bus->iommu_opaque,
+                                                   dev->devfn);
+    }
+    return false;
+}
+
 void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
 {
     /*
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index 8d1af44249..0dfe274c33 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -418,12 +418,25 @@ typedef struct PCIIOMMUOps {
      * @devfn: device and function number of the PCI device.
      */
     void (*unset_iommu_device)(PCIBus *bus, void *opaque, int devfn);
+    /**
+     * @get_pasid_cap: get pasid capability from vIOMMU
+     *
+     * Optional callback.
+     *
+     * @bus: the #PCIBus of the PCI device.
+     *
+     * @opaque: the data passed to pci_setup_iommu().
+     *
+     * @devfn: device and function number of the PCI device.
+     */
+    bool (*get_pasid_cap)(PCIBus *bus, void *opaque, int devfn);
 } PCIIOMMUOps;
 
 AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
 bool pci_device_set_iommu_device(PCIDevice *dev, HostIOMMUDevice *hiod,
                                  Error **errp);
 void pci_device_unset_iommu_device(PCIDevice *dev);
+bool pci_device_get_pasid_cap(PCIDevice *dev);
 
 /**
  * pci_setup_iommu: Initialize specific IOMMU handlers for a PCIBus
-- 
2.41.0.windows.1