svn commit: r348636 - stable/12/sys/riscv/riscv

[Mark Johnston]

Author: markj
Date: Tue Jun  4 17:24:26 2019
New Revision: 348636
URL: https://svnweb.freebsd.org/changeset/base/348636

Log:
  MFC r342735:
  Synchronize access to the allpmaps list.

Modified:
  stable/12/sys/riscv/riscv/pmap.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/riscv/riscv/pmap.c
==============================================================================
--- stable/12/sys/riscv/riscv/pmap.c    Tue Jun  4 17:23:58 2019        
(r348635)
+++ stable/12/sys/riscv/riscv/pmap.c    Tue Jun  4 17:24:26 2019        
(r348636)
@@ -228,6 +228,7 @@ CTASSERT((DMAP_MIN_ADDRESS  & ~L1_OFFSET) == DMAP_MIN_
 CTASSERT((DMAP_MAX_ADDRESS  & ~L1_OFFSET) == DMAP_MAX_ADDRESS);
 
 static struct rwlock_padalign pvh_global_lock;
+static struct mtx_padalign allpmaps_lock;
 
 /*
  * Data for the pv entry allocation mechanism
@@ -380,10 +381,12 @@ pmap_distribute_l1(struct pmap *pmap, vm_pindex_t l1in
        if (pmap != kernel_pmap)
                return;
 
+       mtx_lock(&allpmaps_lock);
        LIST_FOREACH(user_pmap, &allpmaps, pm_list) {
                l1 = &user_pmap->pm_l1[l1index];
                pmap_store(l1, entry);
        }
+       mtx_unlock(&allpmaps_lock);
 }
 
 static pt_entry_t *
@@ -636,9 +639,10 @@ pmap_init(void)
        int i;
 
        /*
-        * Initialize the pv chunk list mutex.
+        * Initialize the pv chunk and pmap list mutexes.
         */
        mtx_init(&pv_chunks_mutex, "pmap pv chunk list", NULL, MTX_DEF);
+       mtx_init(&allpmaps_lock, "allpmaps", NULL, MTX_DEF);
 
        /*
         * Initialize the pool of pv list locks.
@@ -1132,7 +1136,9 @@ pmap_pinit(pmap_t pmap)
        memcpy(pmap->pm_l1, kernel_pmap->pm_l1, PAGE_SIZE);
 
        /* Add to the list of all user pmaps */
+       mtx_lock(&allpmaps_lock);
        LIST_INSERT_HEAD(&allpmaps, pmap, pm_list);
+       mtx_unlock(&allpmaps_lock);
 
        return (1);
 }
@@ -1296,7 +1302,9 @@ pmap_release(pmap_t pmap)
        vm_page_free_zero(m);
 
        /* Remove pmap from the allpmaps list */
+       mtx_lock(&allpmaps_lock);
        LIST_REMOVE(pmap, pm_list);
+       mtx_unlock(&allpmaps_lock);
 
        /* Remove kernel pagetables */
        bzero(pmap->pm_l1, PAGE_SIZE);
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