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Enable the map/unmap recursive mapping functions for all Xen ports for

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save/restore.

For an unknown reason (to me) Xen refuses to update VM translations
when the entry is pointing back to itself (which is precisely
what our recursive VM model does). So enable the functions that take
care of this, which will avoid all sort of memory corruption upon restore
leading domU to trample upon itself.

Save/restore works again for amd64. The occasional domU frontend corruption is
still present, but is harmless to dom0. Now we have a working shell and
ddb inside domU, that helps debugging a tiny bit.

XXX pull-up to -6.
This commit is contained in:
jym 2012-06-24 18:31:52 +00:00
parent 2db61b9b19
commit 23a2531c0e
2 changed files with 5 additions and 14 deletions
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9
sys/arch/xen/include/xenpmap.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: xenpmap.h,v 1.34 2012/04/20 22:23:24 rmind Exp $ */
/* $NetBSD: xenpmap.h,v 1.35 2012/06/24 18:31:52 jym Exp $ */
/*
*
@ -58,11 +58,8 @@ void xen_bcast_invlpg(vaddr_t);
void pmap_xen_resume(void);
void pmap_xen_suspend(void);
#ifdef PAE
void pmap_map_recursive_entries(void);
void pmap_unmap_recursive_entries(void);
#endif /* PAE */
void pmap_map_recursive_entries(void);
void pmap_unmap_recursive_entries(void);
#if defined(PAE) || defined(__x86_64__)
void xen_kpm_sync(struct pmap *, int);

10
sys/arch/xen/x86/xen_pmap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: xen_pmap.c,v 1.21 2012/04/20 22:23:25 rmind Exp $ */
/* $NetBSD: xen_pmap.c,v 1.22 2012/06/24 18:31:53 jym Exp $ */
/*
* Copyright (c) 2007 Manuel Bouyer.
@ -102,7 +102,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: xen_pmap.c,v 1.21 2012/04/20 22:23:25 rmind Exp $");
__KERNEL_RCSID(0, "$NetBSD: xen_pmap.c,v 1.22 2012/06/24 18:31:53 jym Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@ -241,9 +241,7 @@ pmap_extract_ma(struct pmap *pmap, vaddr_t va, paddr_t *pap)
void
pmap_xen_suspend(void)
{
#ifdef PAE
pmap_unmap_recursive_entries();
#endif
xpq_flush_queue();
}
@ -251,14 +249,11 @@ pmap_xen_suspend(void)
void
pmap_xen_resume(void)
{
#ifdef PAE
pmap_map_recursive_entries();
#endif
xpq_flush_queue();
}
#ifdef PAE
/*
* NetBSD uses L2 shadow pages to support PAE with Xen. However, Xen does not
* handle them correctly during save/restore, leading to incorrect page
@ -327,7 +322,6 @@ pmap_unmap_recursive_entries(void)
0);
}
}
#endif /* PAE */
#if defined(PAE) || defined(__x86_64__)