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| author | cperciva <cperciva@FreeBSD.org> | 2010-12-31 17:39:31 +0000 |
|---|---|---|
| committer | cperciva <cperciva@FreeBSD.org> | 2010-12-31 17:39:31 +0000 |
| commit | 76aea5c53e3fe97238b6a231f1b509b01b5f98e4 (patch) | |
| tree | 6056cad2b128bb5178053201ecdb77a7d33ea78b /sys/i386/xen/pmap.c | |
| parent | 0fd3ac8cbfe356eac52578da3043882fa0a99ff0 (diff) | |
| download | FreeBSD-src-76aea5c53e3fe97238b6a231f1b509b01b5f98e4.zip FreeBSD-src-76aea5c53e3fe97238b6a231f1b509b01b5f98e4.tar.gz | |
Make i386_set_ldt work on i386/XEN, step 1/5.
Lock the vm page queue mutex around calls to pte_store. As with many other
uses of the vm page queue mutex in i386/xen/pmap.c, this is bogus and needs
to be replaced at some future date by a spin lock dedicated to protecting
the queue of pending xen page mapping hypervisor calls. (But for now, bogus
locking is better than a panic.)
MFC after: 3 days
Diffstat (limited to 'sys/i386/xen/pmap.c')
| -rw-r--r-- | sys/i386/xen/pmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/i386/xen/pmap.c b/sys/i386/xen/pmap.c index e956777..e91ebaf 100644 --- a/sys/i386/xen/pmap.c +++ b/sys/i386/xen/pmap.c @@ -3647,7 +3647,9 @@ pmap_map_readonly(pmap_t pmap, vm_offset_t va, int len) for (i = 0; i < npages; i++) { pt_entry_t *pte; pte = pmap_pte(pmap, (vm_offset_t)(va + i*PAGE_SIZE)); + vm_page_lock_queues(); pte_store(pte, xpmap_mtop(*pte & ~(PG_RW|PG_M))); + vm_page_unlock_queues(); PMAP_MARK_PRIV(xpmap_mtop(*pte)); pmap_pte_release(pte); } @@ -3661,7 +3663,9 @@ pmap_map_readwrite(pmap_t pmap, vm_offset_t va, int len) pt_entry_t *pte; pte = pmap_pte(pmap, (vm_offset_t)(va + i*PAGE_SIZE)); PMAP_MARK_UNPRIV(xpmap_mtop(*pte)); + vm_page_lock_queues(); pte_store(pte, xpmap_mtop(*pte) | (PG_RW|PG_M)); + vm_page_unlock_queues(); pmap_pte_release(pte); } } |
