[PATCH rfcv1 3/6] intel_iommu: add set/unset_iommu_device callback

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

From: Yi Liu <yi.l.liu@intel.com>

This adds set/unset_iommu_device() implementation in Intel vIOMMU.
In set call, IOMMUFDDevice is recorded in hash table indexed by
PCI BDF.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/hw/i386/intel_iommu.h | 10 +++++
 hw/i386/intel_iommu.c         | 79 +++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+)

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index 7fa0a695c8..c65fdde56f 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -62,6 +62,7 @@ typedef union VTD_IR_TableEntry VTD_IR_TableEntry;
 typedef union VTD_IR_MSIAddress VTD_IR_MSIAddress;
 typedef struct VTDPASIDDirEntry VTDPASIDDirEntry;
 typedef struct VTDPASIDEntry VTDPASIDEntry;
+typedef struct VTDIOMMUFDDevice VTDIOMMUFDDevice;
 
 /* Context-Entry */
 struct VTDContextEntry {
@@ -148,6 +149,13 @@ struct VTDAddressSpace {
     IOVATree *iova_tree;
 };
 
+struct VTDIOMMUFDDevice {
+    PCIBus *bus;
+    uint8_t devfn;
+    IOMMUFDDevice *idev;
+    IntelIOMMUState *iommu_state;
+};
+
 struct VTDIOTLBEntry {
     uint64_t gfn;
     uint16_t domain_id;
@@ -292,6 +300,8 @@ struct IntelIOMMUState {
     /* list of registered notifiers */
     QLIST_HEAD(, VTDAddressSpace) vtd_as_with_notifiers;
 
+    GHashTable *vtd_iommufd_dev;             /* VTDIOMMUFDDevice */
+
     /* interrupt remapping */
     bool intr_enabled;              /* Whether guest enabled IR */
     dma_addr_t intr_root;           /* Interrupt remapping table pointer */
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index ed5677c0ae..95faf697eb 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -237,6 +237,13 @@ static gboolean vtd_as_equal(gconstpointer v1, gconstpointer v2)
            (key1->pasid == key2->pasid);
 }
 
+static gboolean vtd_as_idev_equal(gconstpointer v1, gconstpointer v2)
+{
+    const struct vtd_as_key *key1 = v1;
+    const struct vtd_as_key *key2 = v2;
+
+    return (key1->bus == key2->bus) && (key1->devfn == key2->devfn);
+}
 /*
  * Note that we use pointer to PCIBus as the key, so hashing/shifting
  * based on the pointer value is intended. Note that we deal with
@@ -3812,6 +3819,74 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus,
     return vtd_dev_as;
 }
 
+static int vtd_dev_set_iommu_device(PCIBus *bus, void *opaque, int32_t devfn,
+                                    IOMMUFDDevice *idev, Error **errp)
+{
+    IntelIOMMUState *s = opaque;
+    VTDIOMMUFDDevice *vtd_idev;
+    struct vtd_as_key key = {
+        .bus = bus,
+        .devfn = devfn,
+    };
+    struct vtd_as_key *new_key;
+
+    assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
+
+    /* None IOMMUFD case */
+    if (!idev) {
+        return 0;
+    }
+
+    vtd_iommu_lock(s);
+
+    vtd_idev = g_hash_table_lookup(s->vtd_iommufd_dev, &key);
+
+    if (vtd_idev) {
+        error_setg(errp, "IOMMUFD device already exist");
+        return -1;
+    }
+
+    new_key = g_malloc(sizeof(*new_key));
+    new_key->bus = bus;
+    new_key->devfn = devfn;
+
+    vtd_idev = g_malloc0(sizeof(VTDIOMMUFDDevice));
+    vtd_idev->bus = bus;
+    vtd_idev->devfn = (uint8_t)devfn;
+    vtd_idev->iommu_state = s;
+    vtd_idev->idev = idev;
+
+    g_hash_table_insert(s->vtd_iommufd_dev, new_key, vtd_idev);
+
+    vtd_iommu_unlock(s);
+
+    return 0;
+}
+
+static void vtd_dev_unset_iommu_device(PCIBus *bus, void *opaque, int32_t devfn)
+{
+    IntelIOMMUState *s = opaque;
+    VTDIOMMUFDDevice *vtd_idev;
+    struct vtd_as_key key = {
+        .bus = bus,
+        .devfn = devfn,
+    };
+
+    assert(0 <= devfn && devfn < PCI_DEVFN_MAX);
+
+    vtd_iommu_lock(s);
+
+    vtd_idev = g_hash_table_lookup(s->vtd_iommufd_dev, &key);
+    if (!vtd_idev) {
+        vtd_iommu_unlock(s);
+        return;
+    }
+
+    g_hash_table_remove(s->vtd_iommufd_dev, &key);
+
+    vtd_iommu_unlock(s);
+}
+
 /* Unmap the whole range in the notifier's scope. */
 static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n)
 {
@@ -4107,6 +4182,8 @@ static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void *opaque, int devfn)
 
 static PCIIOMMUOps vtd_iommu_ops = {
     .get_address_space = vtd_host_dma_iommu,
+    .set_iommu_device = vtd_dev_set_iommu_device,
+    .unset_iommu_device = vtd_dev_unset_iommu_device,
 };
 
 static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
@@ -4230,6 +4307,8 @@ static void vtd_realize(DeviceState *dev, Error **errp)
                                      g_free, g_free);
     s->vtd_address_spaces = g_hash_table_new_full(vtd_as_hash, vtd_as_equal,
                                       g_free, g_free);
+    s->vtd_iommufd_dev = g_hash_table_new_full(vtd_as_hash, vtd_as_idev_equal,
+                                               g_free, g_free);
     vtd_init(s);
     pci_setup_iommu(bus, &vtd_iommu_ops, dev);
     /* Pseudo address space under root PCI bus. */
-- 
2.34.1