From 98fcc1d8ee1fb973cb2b63ed6cad756fa42ffce6 Mon Sep 17 00:00:00 2001

From: Peter Xu <peterx@redhat.com>

Date: Fri, 12 Oct 2018 07:58:39 +0100

Subject: [PATCH 09/17] intel-iommu: remove IntelIOMMUNotifierNode

RH-Author: Peter Xu <peterx@redhat.com>

Message-id: <20181012075846.25449-3-peterx@redhat.com>

Patchwork-id: 82676

O-Subject: [RHEL-8 qemu-kvm PATCH 2/9] intel-iommu: remove IntelIOMMUNotifierNode

Bugzilla: 1450712

RH-Acked-by: Auger Eric <eric.auger@redhat.com>

RH-Acked-by: Xiao Wang <jasowang@redhat.com>

RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>

That is not really necessary.  Removing that node struct and put the

list entry directly into VTDAddressSpace.  It simplfies the code a lot.

Since at it, rename the old notifiers_list into vtd_as_with_notifiers.

CC: QEMU Stable <qemu-stable@nongnu.org>

Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

(cherry picked from commit b4a4ba0d68f50f218ee3957b6638dbee32a5eeef)

Signed-off-by: Peter Xu <peterx@redhat.com>

Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>

---

 hw/i386/intel_iommu.c         | 41 +++++++++++------------------------------

 include/hw/i386/intel_iommu.h |  9 ++-------

 2 files changed, 13 insertions(+), 37 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c

index b359efd..3df9045 100644

--- a/hw/i386/intel_iommu.c

+++ b/hw/i386/intel_iommu.c

@@ -1248,10 +1248,10 @@ static void vtd_interrupt_remap_table_setup(IntelIOMMUState *s)

 static void vtd_iommu_replay_all(IntelIOMMUState *s)

 {

-    IntelIOMMUNotifierNode *node;

+    VTDAddressSpace *vtd_as;

-    QLIST_FOREACH(node, &s->notifiers_list, next) {

-        memory_region_iommu_replay_all(&node->vtd_as->iommu);

+    QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) {

+        memory_region_iommu_replay_all(&vtd_as->iommu);

     }

 }

@@ -1372,7 +1372,6 @@ static void vtd_iotlb_global_invalidate(IntelIOMMUState *s)

 static void vtd_iotlb_domain_invalidate(IntelIOMMUState *s, uint16_t domain_id)

 {

-    IntelIOMMUNotifierNode *node;

     VTDContextEntry ce;

     VTDAddressSpace *vtd_as;

@@ -1381,8 +1380,7 @@ static void vtd_iotlb_domain_invalidate(IntelIOMMUState *s, uint16_t domain_id)

     g_hash_table_foreach_remove(s->iotlb, vtd_hash_remove_by_domain,

                                 &domain_id);

-    QLIST_FOREACH(node, &s->notifiers_list, next) {

-        vtd_as = node->vtd_as;

+    QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) {

         if (!vtd_dev_to_context_entry(s, pci_bus_num(vtd_as->bus),

                                       vtd_as->devfn, &ce) &&

             domain_id == VTD_CONTEXT_ENTRY_DID(ce.hi)) {

@@ -1402,12 +1400,11 @@ static void vtd_iotlb_page_invalidate_notify(IntelIOMMUState *s,

                                            uint16_t domain_id, hwaddr addr,

                                            uint8_t am)

 {

-    IntelIOMMUNotifierNode *node;

+    VTDAddressSpace *vtd_as;

     VTDContextEntry ce;

     int ret;

-    QLIST_FOREACH(node, &(s->notifiers_list), next) {

-        VTDAddressSpace *vtd_as = node->vtd_as;

+    QLIST_FOREACH(vtd_as, &(s->vtd_as_with_notifiers), next) {

         ret = vtd_dev_to_context_entry(s, pci_bus_num(vtd_as->bus),

                                        vtd_as->devfn, &ce);

         if (!ret && domain_id == VTD_CONTEXT_ENTRY_DID(ce.hi)) {

@@ -2344,8 +2341,6 @@ static void vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu,

 {

     VTDAddressSpace *vtd_as = container_of(iommu, VTDAddressSpace, iommu);

     IntelIOMMUState *s = vtd_as->iommu_state;

-    IntelIOMMUNotifierNode *node = NULL;

-    IntelIOMMUNotifierNode *next_node = NULL;

     if (!s->caching_mode && new & IOMMU_NOTIFIER_MAP) {

         error_report("We need to set caching-mode=1 for intel-iommu to enable "

@@ -2354,21 +2349,9 @@ static void vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu,

     }

     if (old == IOMMU_NOTIFIER_NONE) {

-        node = g_malloc0(sizeof(*node));

-        node->vtd_as = vtd_as;

-        QLIST_INSERT_HEAD(&s->notifiers_list, node, next);

-        return;

-    }

-

-    /* update notifier node with new flags */

-    QLIST_FOREACH_SAFE(node, &s->notifiers_list, next, next_node) {

-        if (node->vtd_as == vtd_as) {

-            if (new == IOMMU_NOTIFIER_NONE) {

-                QLIST_REMOVE(node, next);

-                g_free(node);

-            }

-            return;

-        }

+        QLIST_INSERT_HEAD(&s->vtd_as_with_notifiers, vtd_as, next);

+    } else if (new == IOMMU_NOTIFIER_NONE) {

+        QLIST_REMOVE(vtd_as, next);

     }

 }

@@ -2838,12 +2821,10 @@ static void vtd_address_space_unmap(VTDAddressSpace *as, IOMMUNotifier *n)

 static void vtd_address_space_unmap_all(IntelIOMMUState *s)

 {

-    IntelIOMMUNotifierNode *node;

     VTDAddressSpace *vtd_as;

     IOMMUNotifier *n;

-    QLIST_FOREACH(node, &s->notifiers_list, next) {

-        vtd_as = node->vtd_as;

+    QLIST_FOREACH(vtd_as, &s->vtd_as_with_notifiers, next) {

         IOMMU_NOTIFIER_FOREACH(n, &vtd_as->iommu) {

             vtd_address_space_unmap(vtd_as, n);

         }

@@ -3088,7 +3069,7 @@ static void vtd_realize(DeviceState *dev, Error **errp)

         return;

     }

-    QLIST_INIT(&s->notifiers_list);

+    QLIST_INIT(&s->vtd_as_with_notifiers);

     memset(s->vtd_as_by_bus_num, 0, sizeof(s->vtd_as_by_bus_num));

     memory_region_init_io(&s->csrmem, OBJECT(s), &vtd_mem_ops, s,

                           "intel_iommu", DMAR_REG_SIZE);

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h

index 45ec891..032e33b 100644

--- a/include/hw/i386/intel_iommu.h

+++ b/include/hw/i386/intel_iommu.h

@@ -67,7 +67,6 @@ typedef union VTD_IR_TableEntry VTD_IR_TableEntry;

 typedef union VTD_IR_MSIAddress VTD_IR_MSIAddress;

 typedef struct VTDIrq VTDIrq;

 typedef struct VTD_MSIMessage VTD_MSIMessage;

-typedef struct IntelIOMMUNotifierNode IntelIOMMUNotifierNode;

 /* Context-Entry */

 struct VTDContextEntry {

@@ -93,6 +92,7 @@ struct VTDAddressSpace {

     MemoryRegion iommu_ir;      /* Interrupt region: 0xfeeXXXXX */

     IntelIOMMUState *iommu_state;

     VTDContextCacheEntry context_cache_entry;

+    QLIST_ENTRY(VTDAddressSpace) next;

 };

 struct VTDBus {

@@ -253,11 +253,6 @@ struct VTD_MSIMessage {

 /* When IR is enabled, all MSI/MSI-X data bits should be zero */

 #define VTD_IR_MSI_DATA          (0)

-struct IntelIOMMUNotifierNode {

-    VTDAddressSpace *vtd_as;

-    QLIST_ENTRY(IntelIOMMUNotifierNode) next;

-};

-

 /* The iommu (DMAR) device state struct */

 struct IntelIOMMUState {

     X86IOMMUState x86_iommu;

@@ -295,7 +290,7 @@ struct IntelIOMMUState {

     GHashTable *vtd_as_by_busptr;   /* VTDBus objects indexed by PCIBus* reference */

     VTDBus *vtd_as_by_bus_num[VTD_PCI_BUS_MAX]; /* VTDBus objects indexed by bus number */

     /* list of registered notifiers */

-    QLIST_HEAD(, IntelIOMMUNotifierNode) notifiers_list;

+    QLIST_HEAD(, VTDAddressSpace) vtd_as_with_notifiers;

     /* interrupt remapping */

     bool intr_enabled;              /* Whether guest enabled IR */

-- 

1.8.3.1