x86/vMSI-X: drop list lock

msixtbl_pt_{,un}register() already run with both the PCI devices lock
and the domain event lock held, so there's no need for another lock.
Just to be on the safe side, acquire the domain event lock in the
cleanup function (albeit I don't think this is strictly necessary).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c
index 81e45c8b7af05d120f1a399de5fd44f4ca587550..7b0cfa9cac816a90bb6b375e9a642a7fe344c70e 100644 (file)
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -468,8 +468,6 @@ int msixtbl_pt_register(struct domain *d, struct pirq *pirq, uint64_t gtable)
 
     pdev = msi_desc->dev;
 
-    spin_lock(&d->arch.hvm_domain.msixtbl_list_lock);
-
     list_for_each_entry( entry, &d->arch.hvm_domain.msixtbl_list, list )
         if ( pdev == entry->pdev )
             goto found;
@@ -480,7 +478,6 @@ int msixtbl_pt_register(struct domain *d, struct pirq *pirq, uint64_t gtable)
 
 found:
     atomic_inc(&entry->refcnt);
-    spin_unlock(&d->arch.hvm_domain.msixtbl_list_lock);
     r = 0;
 
 out:
@@ -530,15 +527,10 @@ void msixtbl_pt_unregister(struct domain *d, struct pirq *pirq)
 
     pdev = msi_desc->dev;
 
-    spin_lock(&d->arch.hvm_domain.msixtbl_list_lock);
-
     list_for_each_entry( entry, &d->arch.hvm_domain.msixtbl_list, list )
         if ( pdev == entry->pdev )
             goto found;
 
-    spin_unlock(&d->arch.hvm_domain.msixtbl_list_lock);
-
-
 out:
     spin_unlock_irq(&irq_desc->lock);
     return;
@@ -547,7 +539,6 @@ found:
     if ( !atomic_dec_and_test(&entry->refcnt) )
         del_msixtbl_entry(entry);
 
-    spin_unlock(&d->arch.hvm_domain.msixtbl_list_lock);
     spin_unlock_irq(&irq_desc->lock);
 }
 
@@ -558,7 +549,6 @@ void msixtbl_init(struct domain *d)
         return;
 
     INIT_LIST_HEAD(&d->arch.hvm_domain.msixtbl_list);
-    spin_lock_init(&d->arch.hvm_domain.msixtbl_list_lock);
 
     register_mmio_handler(d, &msixtbl_mmio_ops);
 }
@@ -566,21 +556,17 @@ void msixtbl_init(struct domain *d)
 void msixtbl_pt_cleanup(struct domain *d)
 {
     struct msixtbl_entry *entry, *temp;
-    unsigned long flags;
 
     if ( !d->arch.hvm_domain.msixtbl_list.next )
         return;
 
-    /* msixtbl_list_lock must be acquired with irq_disabled for check_lock() */
-    local_irq_save(flags); 
-    spin_lock(&d->arch.hvm_domain.msixtbl_list_lock);
+    spin_lock(&d->event_lock);
 
     list_for_each_entry_safe( entry, temp,
                               &d->arch.hvm_domain.msixtbl_list, list )
         del_msixtbl_entry(entry);
 
-    spin_unlock(&d->arch.hvm_domain.msixtbl_list_lock);
-    local_irq_restore(flags);
+    spin_unlock(&d->event_lock);
 }
 
 void msix_write_completion(struct vcpu *v)

diff --git a/xen/include/asm-x86/hvm/domain.h b/xen/include/asm-x86/hvm/domain.h
index f500ff493b29f27b47efa64bfc315b390422f085..f34d784c6cfeecc25f41895ccb0597fd1804199b 100644 (file)
--- a/xen/include/asm-x86/hvm/domain.h
+++ b/xen/include/asm-x86/hvm/domain.h
@@ -124,7 +124,6 @@ struct hvm_domain {
 
     /* hypervisor intercepted msix table */
     struct list_head       msixtbl_list;
-    spinlock_t             msixtbl_list_lock;
 
     struct viridian_domain viridian;