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Make i386_set_ldt work on i386/XEN, step 1/5.

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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
This commit is contained in:
cperciva 2010-12-31 17:39:31 +00:00
parent 0fd3ac8cbf
commit 76aea5c53e
1 changed files with 4 additions and 0 deletions
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4
sys/i386/xen/pmap.c
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@ -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);
}
}