PERFORCE change 132226 for review
Kip Macy
kmacy at FreeBSD.org
Mon Dec 31 22:32:00 PST 2007
http://perforce.freebsd.org/chv.cgi?CH=132226
Change 132226 by kmacy at pandemonium:kmacy:xen31 on 2008/01/01 06:31:39
make sf_buf work on xen
Affected files ...
.. //depot/projects/xen31/sys/i386/i386/vm_machdep.c#3 edit
Differences ...
==== //depot/projects/xen31/sys/i386/i386/vm_machdep.c#3 (text+ko) ====
@@ -265,7 +265,7 @@
/* Setup to release spin count in fork_exit(). */
td2->td_md.md_spinlock_count = 1;
- td2->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
+ td2->td_md.md_saved_flags = PSL_USER;
/*
* Now, cpu_switch() can schedule the new process.
@@ -446,7 +446,7 @@
/* Setup to release spin count in fork_exit(). */
td->td_md.md_spinlock_count = 1;
- td->td_md.md_saved_flags = PSL_KERNEL | PSL_I;
+ td->td_md.md_saved_flags = PSL_USER;
}
/*
@@ -772,8 +772,11 @@
*/
ptep = vtopte(sf->kva);
opte = *ptep;
+#ifdef XEN
+ PT_SET_MA(sf->kva, xpmap_ptom(VM_PAGE_TO_PHYS(m)) | pgeflag | PG_RW | PG_V);
+#else
*ptep = VM_PAGE_TO_PHYS(m) | pgeflag | PG_RW | PG_V;
-
+#endif
/*
* Avoid unnecessary TLB invalidations: If the sf_buf's old
* virtual-to-physical mapping was not used, then any processor
@@ -822,6 +825,14 @@
if (sf->ref_count == 0) {
TAILQ_INSERT_TAIL(&sf_buf_freelist, sf, free_entry);
nsfbufsused--;
+#ifdef XEN
+ /*
+ * Xen doesn't like having dangling R/W mappings
+ */
+ pmap_qremove(sf->kva, 1);
+ sf->m = NULL;
+ LIST_REMOVE(sf, list_entry);
+#endif
if (sf_buf_alloc_want > 0)
wakeup_one(&sf_buf_freelist);
}
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