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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/5] x86-64: fold shadow_page_info fields into page_info
... combining the list entry members of both structures and removing
the artificial 'mbz' member (shadow code must keep the real underlying
member 'count_info' at zero for the lifetime of pages use as shadows).
This also fixes a latent issue with u.inuse._domain not getting
explicitly cleared before returning shadow pages to the domain heap -
it just so happened that this member turned out to be zero in all
(normal?) cases when a shadow page ends its life (but there were
neither build nor run-time assertions that this would actually be the
case). The bug got exposed by a subsequent patch changing the order of
fields in struct page_info.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2009-01-30.orig/xen/arch/x86/mm/shadow/common.c 2009-01-30
10:13:53.000000000 +0100
+++ 2009-01-30/xen/arch/x86/mm/shadow/common.c 2009-01-30 10:17:04.000000000
+0100
@@ -48,9 +48,9 @@ void shadow_domain_init(struct domain *d
int i;
shadow_lock_init(d);
for ( i = 0; i <= SHADOW_MAX_ORDER; i++ )
- INIT_LIST_HEAD(&d->arch.paging.shadow.freelists[i]);
+ INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.freelists[i]);
INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.p2m_freelist);
- INIT_LIST_HEAD(&d->arch.paging.shadow.pinned_shadows);
+ INIT_PAGE_LIST_HEAD(&d->arch.paging.shadow.pinned_shadows);
/* Use shadow pagetables for log-dirty support */
paging_log_dirty_init(d, shadow_enable_log_dirty,
@@ -1291,9 +1291,9 @@ static inline int space_is_available(
for ( ; order <= shadow_max_order(d); ++order )
{
unsigned int n = count;
- const struct list_head *p;
+ const struct shadow_page_info *sp;
- list_for_each ( p, &d->arch.paging.shadow.freelists[order] )
+ page_list_for_each ( sp, &d->arch.paging.shadow.freelists[order] )
if ( --n == 0 )
return 1;
count = (count + 1) >> 1;
@@ -1307,7 +1307,7 @@ static inline int space_is_available(
static void shadow_unhook_mappings(struct vcpu *v, mfn_t smfn)
{
struct shadow_page_info *sp = mfn_to_shadow_page(smfn);
- switch ( sp->type )
+ switch ( sp->u.sh.type )
{
case SH_type_l2_32_shadow:
SHADOW_INTERNAL_NAME(sh_unhook_32b_mappings, 2)(v,smfn);
@@ -1322,7 +1322,7 @@ static void shadow_unhook_mappings(struc
break;
#endif
default:
- SHADOW_ERROR("top-level shadow has bad type %08x\n", sp->type);
+ SHADOW_ERROR("top-level shadow has bad type %08x\n", sp->u.sh.type);
BUG();
}
}
@@ -1334,7 +1334,7 @@ static inline void trace_shadow_prealloc
/* Convert smfn to gfn */
unsigned long gfn;
ASSERT(mfn_valid(smfn));
- gfn = mfn_to_gfn(d, _mfn(mfn_to_shadow_page(smfn)->backpointer));
+ gfn = mfn_to_gfn(d, _mfn(mfn_to_shadow_page(smfn)->u.sh.back));
__trace_var(TRC_SHADOW_PREALLOC_UNPIN, 0/*!tsc*/,
sizeof(gfn), (unsigned char*)&gfn);
}
@@ -1350,8 +1350,7 @@ static void _shadow_prealloc(
/* Need a vpcu for calling unpins; for now, since we don't have
* per-vcpu shadows, any will do */
struct vcpu *v, *v2;
- struct list_head *l, *t;
- struct shadow_page_info *sp;
+ struct shadow_page_info *sp, *t;
mfn_t smfn;
int i;
@@ -1365,9 +1364,8 @@ static void _shadow_prealloc(
/* Stage one: walk the list of pinned pages, unpinning them */
perfc_incr(shadow_prealloc_1);
- list_for_each_backwards_safe(l, t, &d->arch.paging.shadow.pinned_shadows)
+ page_list_for_each_safe_reverse(sp, t,
&d->arch.paging.shadow.pinned_shadows)
{
- sp = list_entry(l, struct shadow_page_info, list);
smfn = shadow_page_to_mfn(sp);
/* Unpin this top-level shadow */
@@ -1427,8 +1425,7 @@ void shadow_prealloc(struct domain *d, u
* this domain's shadows */
static void shadow_blow_tables(struct domain *d)
{
- struct list_head *l, *t;
- struct shadow_page_info *sp;
+ struct shadow_page_info *sp, *t;
struct vcpu *v = d->vcpu[0];
mfn_t smfn;
int i;
@@ -1436,9 +1433,8 @@ static void shadow_blow_tables(struct do
ASSERT(v != NULL);
/* Pass one: unpin all pinned pages */
- list_for_each_backwards_safe(l,t, &d->arch.paging.shadow.pinned_shadows)
+ page_list_for_each_safe_reverse(sp, t,
&d->arch.paging.shadow.pinned_shadows)
{
- sp = list_entry(l, struct shadow_page_info, list);
smfn = shadow_page_to_mfn(sp);
sh_unpin(v, smfn);
}
@@ -1515,7 +1511,7 @@ mfn_t shadow_alloc(struct domain *d,
/* Find smallest order which can satisfy the request. */
for ( i = order; i <= SHADOW_MAX_ORDER; i++ )
- if ( !list_empty(&d->arch.paging.shadow.freelists[i]) )
+ if ( (sp = page_list_remove_head(&d->arch.paging.shadow.freelists[i]))
)
goto found;
/* If we get here, we failed to allocate. This should never happen.
@@ -1526,16 +1522,12 @@ mfn_t shadow_alloc(struct domain *d,
BUG();
found:
- sp = list_entry(d->arch.paging.shadow.freelists[i].next,
- struct shadow_page_info, list);
- list_del(&sp->list);
-
/* We may have to halve the chunk a number of times. */
while ( i != order )
{
i--;
- sp->order = i;
- list_add_tail(&sp->list, &d->arch.paging.shadow.freelists[i]);
+ sp->u.sh.order = i;
+ page_list_add_tail(sp, &d->arch.paging.shadow.freelists[i]);
sp += 1 << i;
}
d->arch.paging.shadow.free_pages -= 1 << order;
@@ -1557,11 +1549,11 @@ mfn_t shadow_alloc(struct domain *d,
ASSERT(p != NULL);
clear_page(p);
sh_unmap_domain_page(p);
- INIT_LIST_HEAD(&sp[i].list);
- sp[i].type = shadow_type;
- sp[i].pinned = 0;
- sp[i].count = 0;
- sp[i].backpointer = backpointer;
+ INIT_PAGE_LIST_ENTRY(&sp[i].list);
+ sp[i].u.sh.type = shadow_type;
+ sp[i].u.sh.pinned = 0;
+ sp[i].u.sh.count = 0;
+ sp[i].u.sh.back = backpointer;
sp[i].next_shadow = NULL;
perfc_incr(shadow_alloc_count);
}
@@ -1581,7 +1573,7 @@ void shadow_free(struct domain *d, mfn_t
ASSERT(shadow_locked_by_me(d));
perfc_incr(shadow_free);
- shadow_type = sp->type;
+ shadow_type = sp->u.sh.type;
ASSERT(shadow_type != SH_type_none);
ASSERT(shadow_type != SH_type_p2m_table);
order = shadow_order(shadow_type);
@@ -1605,7 +1597,7 @@ void shadow_free(struct domain *d, mfn_t
}
#endif
/* Strip out the type: this is now a free shadow page */
- sp[i].type = 0;
+ sp[i].u.sh.type = 0;
/* Remember the TLB timestamp so we will know whether to flush
* TLBs when we reuse the page. Because the destructors leave the
* contents of the pages in place, we can delay TLB flushes until
@@ -1620,20 +1612,22 @@ void shadow_free(struct domain *d, mfn_t
mask = 1 << order;
if ( (mfn_x(shadow_page_to_mfn(sp)) & mask) ) {
/* Merge with predecessor block? */
- if ( ((sp-mask)->type != PGT_none) || ((sp-mask)->order != order) )
+ if ( ((sp-mask)->u.sh.type != PGT_none) ||
+ ((sp-mask)->u.sh.order != order) )
break;
- list_del(&(sp-mask)->list);
sp -= mask;
+ page_list_del(sp, &d->arch.paging.shadow.freelists[order]);
} else {
/* Merge with successor block? */
- if ( ((sp+mask)->type != PGT_none) || ((sp+mask)->order != order) )
+ if ( ((sp+mask)->u.sh.type != PGT_none) ||
+ ((sp+mask)->u.sh.order != order) )
break;
- list_del(&(sp+mask)->list);
+ page_list_del(sp + mask, &d->arch.paging.shadow.freelists[order]);
}
}
- sp->order = order;
- list_add_tail(&sp->list, &d->arch.paging.shadow.freelists[order]);
+ sp->u.sh.order = order;
+ page_list_add_tail(sp, &d->arch.paging.shadow.freelists[order]);
}
/* Divert some memory from the pool to be used by the p2m mapping.
@@ -1810,23 +1804,26 @@ static unsigned int sh_set_allocation(st
d->arch.paging.shadow.total_pages += 1 << order;
for ( j = 0; j < 1U << order; j++ )
{
- sp[j].type = 0;
- sp[j].pinned = 0;
- sp[j].count = 0;
- sp[j].mbz = 0;
+ sp[j].u.sh.type = 0;
+ sp[j].u.sh.pinned = 0;
+ sp[j].u.sh.count = 0;
sp[j].tlbflush_timestamp = 0; /* Not in any TLB */
}
- sp->order = order;
- list_add_tail(&sp->list, &d->arch.paging.shadow.freelists[order]);
+ sp->u.sh.order = order;
+ page_list_add_tail(sp, &d->arch.paging.shadow.freelists[order]);
}
else if ( d->arch.paging.shadow.total_pages > pages )
{
/* Need to return memory to domheap */
_shadow_prealloc(d, order, 1);
- ASSERT(!list_empty(&d->arch.paging.shadow.freelists[order]));
- sp = list_entry(d->arch.paging.shadow.freelists[order].next,
- struct shadow_page_info, list);
- list_del(&sp->list);
+ sp =
page_list_remove_head(&d->arch.paging.shadow.freelists[order]);
+ ASSERT(sp);
+ /*
+ * The pages were allocated anonymously, but the owner field
+ * gets overwritten normally, so need to clear it here.
+ */
+ for ( j = 0; j < 1U << order; j++ )
+ page_set_owner(&((struct page_info *)sp)[j], NULL);
d->arch.paging.shadow.free_pages -= 1 << order;
d->arch.paging.shadow.total_pages -= 1 << order;
free_domheap_pages((struct page_info *)sp, order);
@@ -1886,37 +1883,38 @@ static void sh_hash_audit_bucket(struct
while ( sp )
{
/* Not a shadow? */
- BUG_ON( sp->mbz != 0 );
+ BUG_ON( sp->count_info != 0 );
/* Bogus type? */
- BUG_ON( sp->type == 0 );
- BUG_ON( sp->type > SH_type_max_shadow );
+ BUG_ON( sp->u.sh.type == 0 );
+ BUG_ON( sp->u.sh.type > SH_type_max_shadow );
/* Wrong bucket? */
- BUG_ON( sh_hash(sp->backpointer, sp->type) != bucket );
+ BUG_ON( sh_hash(sp->u.sh.back, sp->u.sh.type) != bucket );
/* Duplicate entry? */
for ( x = sp->next_shadow; x; x = x->next_shadow )
- BUG_ON( x->backpointer == sp->backpointer && x->type == sp->type );
+ BUG_ON( x->u.sh.back == sp->u.sh.back &&
+ x->u.sh.type == sp->u.sh.type );
/* Follow the backpointer to the guest pagetable */
- if ( sp->type != SH_type_fl1_32_shadow
- && sp->type != SH_type_fl1_pae_shadow
- && sp->type != SH_type_fl1_64_shadow )
+ if ( sp->u.sh.type != SH_type_fl1_32_shadow
+ && sp->u.sh.type != SH_type_fl1_pae_shadow
+ && sp->u.sh.type != SH_type_fl1_64_shadow )
{
- struct page_info *gpg = mfn_to_page(_mfn(sp->backpointer));
+ struct page_info *gpg = mfn_to_page(_mfn(sp->u.sh.back));
/* Bad shadow flags on guest page? */
- BUG_ON( !(gpg->shadow_flags & (1<<sp->type)) );
+ BUG_ON( !(gpg->shadow_flags & (1<<sp->u.sh.type)) );
/* Bad type count on guest page? */
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
- if ( sp->type == SH_type_l1_32_shadow
- || sp->type == SH_type_l1_pae_shadow
- || sp->type == SH_type_l1_64_shadow )
+ if ( sp->u.sh.type == SH_type_l1_32_shadow
+ || sp->u.sh.type == SH_type_l1_pae_shadow
+ || sp->u.sh.type == SH_type_l1_64_shadow )
{
if ( (gpg->u.inuse.type_info & PGT_type_mask) ==
PGT_writable_page
&& (gpg->u.inuse.type_info & PGT_count_mask) != 0 )
{
if ( !page_is_out_of_sync(gpg) )
{
- SHADOW_ERROR("MFN %#lx shadowed (by %#"PRI_mfn")"
+ SHADOW_ERROR("MFN %#"PRpgmfn" shadowed (by
%#"PRI_mfn")"
" and not OOS but has typecount %#lx\n",
- sp->backpointer,
+ sp->u.sh.back,
mfn_x(shadow_page_to_mfn(sp)),
gpg->u.inuse.type_info);
BUG();
@@ -1928,9 +1926,9 @@ static void sh_hash_audit_bucket(struct
if ( (gpg->u.inuse.type_info & PGT_type_mask) == PGT_writable_page
&& (gpg->u.inuse.type_info & PGT_count_mask) != 0 )
{
- SHADOW_ERROR("MFN %#lx shadowed (by %#"PRI_mfn")"
+ SHADOW_ERROR("MFN %#"PRpgmfn" shadowed (by %#"PRI_mfn")"
" but has typecount %#lx\n",
- sp->backpointer, mfn_x(shadow_page_to_mfn(sp)),
+ sp->u.sh.back, mfn_x(shadow_page_to_mfn(sp)),
gpg->u.inuse.type_info);
BUG();
}
@@ -2016,7 +2014,7 @@ mfn_t shadow_hash_lookup(struct vcpu *v,
prev = NULL;
while(sp)
{
- if ( sp->backpointer == n && sp->type == t )
+ if ( sp->u.sh.back == n && sp->u.sh.type == t )
{
/* Pull-to-front if 'sp' isn't already the head item */
if ( unlikely(sp != d->arch.paging.shadow.hash_table[key]) )
@@ -2148,12 +2146,12 @@ static void hash_foreach(struct vcpu *v,
* deleted anything from the hash (lookups are OK, though). */
for ( x = d->arch.paging.shadow.hash_table[i]; x; x = x->next_shadow )
{
- if ( callback_mask & (1 << x->type) )
+ if ( callback_mask & (1 << x->u.sh.type) )
{
- ASSERT(x->type <= 15);
- ASSERT(callbacks[x->type] != NULL);
- done = callbacks[x->type](v, shadow_page_to_mfn(x),
- callback_mfn);
+ ASSERT(x->u.sh.type <= 15);
+ ASSERT(callbacks[x->u.sh.type] != NULL);
+ done = callbacks[x->u.sh.type](v, shadow_page_to_mfn(x),
+ callback_mfn);
if ( done ) break;
}
}
@@ -2171,7 +2169,7 @@ static void hash_foreach(struct vcpu *v,
void sh_destroy_shadow(struct vcpu *v, mfn_t smfn)
{
struct shadow_page_info *sp = mfn_to_shadow_page(smfn);
- unsigned int t = sp->type;
+ unsigned int t = sp->u.sh.type;
SHADOW_PRINTK("smfn=%#lx\n", mfn_x(smfn));
@@ -2183,7 +2181,7 @@ void sh_destroy_shadow(struct vcpu *v, m
t == SH_type_fl1_64_shadow ||
t == SH_type_monitor_table ||
(is_pv_32on64_vcpu(v) && t == SH_type_l4_64_shadow) ||
- (page_get_owner(mfn_to_page(_mfn(sp->backpointer)))
+ (page_get_owner(mfn_to_page(_mfn(sp->u.sh.back)))
== v->domain));
/* The down-shifts here are so that the switch statement is on nice
@@ -2435,7 +2433,7 @@ int sh_remove_write_access(struct vcpu *
{
unsigned long old_count = (pg->u.inuse.type_info & PGT_count_mask);
mfn_t last_smfn = _mfn(v->arch.paging.shadow.last_writeable_pte_smfn);
- int shtype = mfn_to_shadow_page(last_smfn)->type;
+ int shtype = mfn_to_shadow_page(last_smfn)->u.sh.type;
if ( callbacks[shtype] )
callbacks[shtype](v, last_smfn, gmfn);
@@ -2483,20 +2481,20 @@ int sh_remove_write_access_from_sl1p(str
ASSERT(mfn_valid(smfn));
ASSERT(mfn_valid(gmfn));
- if ( sp->type == SH_type_l1_32_shadow
- || sp->type == SH_type_fl1_32_shadow )
+ if ( sp->u.sh.type == SH_type_l1_32_shadow
+ || sp->u.sh.type == SH_type_fl1_32_shadow )
{
return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p,2)
(v, gmfn, smfn, off);
}
#if CONFIG_PAGING_LEVELS >= 3
- else if ( sp->type == SH_type_l1_pae_shadow
- || sp->type == SH_type_fl1_pae_shadow )
+ else if ( sp->u.sh.type == SH_type_l1_pae_shadow
+ || sp->u.sh.type == SH_type_fl1_pae_shadow )
return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p,3)
(v, gmfn, smfn, off);
#if CONFIG_PAGING_LEVELS >= 4
- else if ( sp->type == SH_type_l1_64_shadow
- || sp->type == SH_type_fl1_64_shadow )
+ else if ( sp->u.sh.type == SH_type_l1_64_shadow
+ || sp->u.sh.type == SH_type_fl1_64_shadow )
return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p,4)
(v, gmfn, smfn, off);
#endif
@@ -2603,12 +2601,12 @@ static int sh_remove_shadow_via_pointer(
void *vaddr;
int rc;
- ASSERT(sp->type > 0);
- ASSERT(sp->type < SH_type_max_shadow);
- ASSERT(sp->type != SH_type_l2_32_shadow);
- ASSERT(sp->type != SH_type_l2_pae_shadow);
- ASSERT(sp->type != SH_type_l2h_pae_shadow);
- ASSERT(sp->type != SH_type_l4_64_shadow);
+ ASSERT(sp->u.sh.type > 0);
+ ASSERT(sp->u.sh.type < SH_type_max_shadow);
+ ASSERT(sp->u.sh.type != SH_type_l2_32_shadow);
+ ASSERT(sp->u.sh.type != SH_type_l2_pae_shadow);
+ ASSERT(sp->u.sh.type != SH_type_l2h_pae_shadow);
+ ASSERT(sp->u.sh.type != SH_type_l4_64_shadow);
if (sp->up == 0) return 0;
pmfn = _mfn(sp->up >> PAGE_SHIFT);
@@ -2619,10 +2617,10 @@ static int sh_remove_shadow_via_pointer(
ASSERT(l1e_get_pfn(*(l1_pgentry_t *)vaddr) == mfn_x(smfn));
/* Is this the only reference to this shadow? */
- rc = (sp->count == 1) ? 1 : 0;
+ rc = (sp->u.sh.count == 1) ? 1 : 0;
/* Blank the offending entry */
- switch (sp->type)
+ switch (sp->u.sh.type)
{
case SH_type_l1_32_shadow:
case SH_type_l2_32_shadow:
--- 2009-01-30.orig/xen/arch/x86/mm/shadow/multi.c 2009-01-30
08:27:02.000000000 +0100
+++ 2009-01-30/xen/arch/x86/mm/shadow/multi.c 2009-01-30 10:14:47.000000000
+0100
@@ -974,12 +974,12 @@ static int shadow_set_l2e(struct vcpu *v
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
{
struct shadow_page_info *sp = mfn_to_shadow_page(sl1mfn);
- mfn_t gl1mfn = _mfn(sp->backpointer);
+ mfn_t gl1mfn = _mfn(sp->u.sh.back);
/* If the shadow is a fl1 then the backpointer contains
the GFN instead of the GMFN, and it's definitely not
OOS. */
- if ( (sp->type != SH_type_fl1_shadow) && mfn_valid(gl1mfn)
+ if ( (sp->u.sh.type != SH_type_fl1_shadow) && mfn_valid(gl1mfn)
&& mfn_is_out_of_sync(gl1mfn) )
sh_resync(v, gl1mfn);
}
@@ -1194,8 +1194,8 @@ static inline void increment_ptr_to_gues
do { \
int _i; \
shadow_l1e_t *_sp = sh_map_domain_page((_sl1mfn)); \
- ASSERT(mfn_to_shadow_page(_sl1mfn)->type == SH_type_l1_shadow \
- || mfn_to_shadow_page(_sl1mfn)->type == SH_type_fl1_shadow); \
+ ASSERT(mfn_to_shadow_page(_sl1mfn)->u.sh.type == SH_type_l1_shadow \
+ || mfn_to_shadow_page(_sl1mfn)->u.sh.type == SH_type_fl1_shadow);\
for ( _i = 0; _i < SHADOW_L1_PAGETABLE_ENTRIES; _i++ ) \
{ \
(_sl1e) = _sp + _i; \
@@ -1232,7 +1232,7 @@ do {
do { \
int _i, _j, __done = 0; \
int _xen = !shadow_mode_external(_dom); \
- ASSERT(mfn_to_shadow_page(_sl2mfn)->type == SH_type_l2_32_shadow); \
+ ASSERT(mfn_to_shadow_page(_sl2mfn)->u.sh.type == SH_type_l2_32_shadow);\
for ( _j = 0; _j < 4 && !__done; _j++ ) \
{ \
shadow_l2e_t *_sp = sh_map_domain_page(_sl2mfn); \
@@ -1260,11 +1260,11 @@ do {
int _i; \
int _xen = !shadow_mode_external(_dom); \
shadow_l2e_t *_sp = sh_map_domain_page((_sl2mfn)); \
- ASSERT(mfn_to_shadow_page(_sl2mfn)->type == SH_type_l2_pae_shadow \
- || mfn_to_shadow_page(_sl2mfn)->type == SH_type_l2h_pae_shadow);\
+ ASSERT(mfn_to_shadow_page(_sl2mfn)->u.sh.type == SH_type_l2_pae_shadow \
+ || mfn_to_shadow_page(_sl2mfn)->u.sh.type ==
SH_type_l2h_pae_shadow);\
for ( _i = 0; _i < SHADOW_L2_PAGETABLE_ENTRIES; _i++ ) \
if ( (!(_xen)) \
- || mfn_to_shadow_page(_sl2mfn)->type != SH_type_l2h_pae_shadow\
+ || mfn_to_shadow_page(_sl2mfn)->u.sh.type !=
SH_type_l2h_pae_shadow\
|| ((_i + (3 * SHADOW_L2_PAGETABLE_ENTRIES)) \
< (HYPERVISOR_VIRT_START >> SHADOW_L2_PAGETABLE_SHIFT)) ) \
{ \
@@ -1285,13 +1285,13 @@ do {
int _i; \
int _xen = !shadow_mode_external(_dom); \
shadow_l2e_t *_sp = sh_map_domain_page((_sl2mfn)); \
- ASSERT(mfn_to_shadow_page(_sl2mfn)->type == SH_type_l2_64_shadow || \
- mfn_to_shadow_page(_sl2mfn)->type == SH_type_l2h_64_shadow); \
+ ASSERT(mfn_to_shadow_page(_sl2mfn)->u.sh.type == SH_type_l2_64_shadow ||\
+ mfn_to_shadow_page(_sl2mfn)->u.sh.type == SH_type_l2h_64_shadow);\
for ( _i = 0; _i < SHADOW_L2_PAGETABLE_ENTRIES; _i++ ) \
{ \
if ( (!(_xen)) \
|| !is_pv_32on64_domain(_dom) \
- || mfn_to_shadow_page(_sl2mfn)->type != SH_type_l2h_64_shadow \
+ || mfn_to_shadow_page(_sl2mfn)->u.sh.type !=
SH_type_l2h_64_shadow\
|| (_i < COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(_dom)) ) \
{ \
(_sl2e) = _sp + _i; \
@@ -1313,7 +1313,7 @@ do {
do { \
int _i; \
shadow_l3e_t *_sp = sh_map_domain_page((_sl3mfn)); \
- ASSERT(mfn_to_shadow_page(_sl3mfn)->type == SH_type_l3_64_shadow); \
+ ASSERT(mfn_to_shadow_page(_sl3mfn)->u.sh.type == SH_type_l3_64_shadow);\
for ( _i = 0; _i < SHADOW_L3_PAGETABLE_ENTRIES; _i++ ) \
{ \
(_sl3e) = _sp + _i; \
@@ -1331,7 +1331,7 @@ do {
shadow_l4e_t *_sp = sh_map_domain_page((_sl4mfn)); \
int _xen = !shadow_mode_external(_dom); \
int _i; \
- ASSERT(mfn_to_shadow_page(_sl4mfn)->type == SH_type_l4_64_shadow); \
+ ASSERT(mfn_to_shadow_page(_sl4mfn)->u.sh.type == SH_type_l4_64_shadow);\
for ( _i = 0; _i < SHADOW_L4_PAGETABLE_ENTRIES; _i++ ) \
{ \
if ( (!(_xen)) || is_guest_l4_slot(_dom, _i) ) \
@@ -1519,14 +1519,12 @@ sh_make_shadow(struct vcpu *v, mfn_t gmf
* of them, decide that this isn't an old linux guest, and stop
* pinning l3es. This is not very quick but it doesn't happen
* very often. */
- struct list_head *l, *t;
- struct shadow_page_info *sp;
+ struct shadow_page_info *sp, *t;
struct vcpu *v2;
int l4count = 0, vcpus = 0;
- list_for_each(l, &v->domain->arch.paging.shadow.pinned_shadows)
+ page_list_for_each(sp, &v->domain->arch.paging.shadow.pinned_shadows)
{
- sp = list_entry(l, struct shadow_page_info, list);
- if ( sp->type == SH_type_l4_64_shadow )
+ if ( sp->u.sh.type == SH_type_l4_64_shadow )
l4count++;
}
for_each_vcpu ( v->domain, v2 )
@@ -1534,10 +1532,9 @@ sh_make_shadow(struct vcpu *v, mfn_t gmf
if ( l4count > 2 * vcpus )
{
/* Unpin all the pinned l3 tables, and don't pin any more. */
- list_for_each_safe(l, t,
&v->domain->arch.paging.shadow.pinned_shadows)
+ page_list_for_each_safe(sp, t,
&v->domain->arch.paging.shadow.pinned_shadows)
{
- sp = list_entry(l, struct shadow_page_info, list);
- if ( sp->type == SH_type_l3_64_shadow )
+ if ( sp->u.sh.type == SH_type_l3_64_shadow )
sh_unpin(v, shadow_page_to_mfn(sp));
}
v->domain->arch.paging.shadow.opt_flags &=
~SHOPT_LINUX_L3_TOPLEVEL;
@@ -1921,7 +1918,7 @@ static shadow_l1e_t * shadow_get_and_cre
void sh_destroy_l4_shadow(struct vcpu *v, mfn_t smfn)
{
shadow_l4e_t *sl4e;
- u32 t = mfn_to_shadow_page(smfn)->type;
+ u32 t = mfn_to_shadow_page(smfn)->u.sh.type;
mfn_t gmfn, sl4mfn;
SHADOW_DEBUG(DESTROY_SHADOW,
@@ -1929,7 +1926,7 @@ void sh_destroy_l4_shadow(struct vcpu *v
ASSERT(t == SH_type_l4_shadow);
/* Record that the guest page isn't shadowed any more (in this type) */
- gmfn = _mfn(mfn_to_shadow_page(smfn)->backpointer);
+ gmfn = _mfn(mfn_to_shadow_page(smfn)->u.sh.back);
delete_shadow_status(v, gmfn, t, smfn);
shadow_demote(v, gmfn, t);
/* Decrement refcounts of all the old entries */
@@ -1950,7 +1947,7 @@ void sh_destroy_l4_shadow(struct vcpu *v
void sh_destroy_l3_shadow(struct vcpu *v, mfn_t smfn)
{
shadow_l3e_t *sl3e;
- u32 t = mfn_to_shadow_page(smfn)->type;
+ u32 t = mfn_to_shadow_page(smfn)->u.sh.type;
mfn_t gmfn, sl3mfn;
SHADOW_DEBUG(DESTROY_SHADOW,
@@ -1958,7 +1955,7 @@ void sh_destroy_l3_shadow(struct vcpu *v
ASSERT(t == SH_type_l3_shadow);
/* Record that the guest page isn't shadowed any more (in this type) */
- gmfn = _mfn(mfn_to_shadow_page(smfn)->backpointer);
+ gmfn = _mfn(mfn_to_shadow_page(smfn)->u.sh.back);
delete_shadow_status(v, gmfn, t, smfn);
shadow_demote(v, gmfn, t);
@@ -1980,7 +1977,7 @@ void sh_destroy_l3_shadow(struct vcpu *v
void sh_destroy_l2_shadow(struct vcpu *v, mfn_t smfn)
{
shadow_l2e_t *sl2e;
- u32 t = mfn_to_shadow_page(smfn)->type;
+ u32 t = mfn_to_shadow_page(smfn)->u.sh.type;
mfn_t gmfn, sl2mfn;
SHADOW_DEBUG(DESTROY_SHADOW,
@@ -1993,7 +1990,7 @@ void sh_destroy_l2_shadow(struct vcpu *v
#endif
/* Record that the guest page isn't shadowed any more (in this type) */
- gmfn = _mfn(mfn_to_shadow_page(smfn)->backpointer);
+ gmfn = _mfn(mfn_to_shadow_page(smfn)->u.sh.back);
delete_shadow_status(v, gmfn, t, smfn);
shadow_demote(v, gmfn, t);
@@ -2014,7 +2011,7 @@ void sh_destroy_l1_shadow(struct vcpu *v
{
struct domain *d = v->domain;
shadow_l1e_t *sl1e;
- u32 t = mfn_to_shadow_page(smfn)->type;
+ u32 t = mfn_to_shadow_page(smfn)->u.sh.type;
SHADOW_DEBUG(DESTROY_SHADOW,
"%s(%05lx)\n", __func__, mfn_x(smfn));
@@ -2023,12 +2020,12 @@ void sh_destroy_l1_shadow(struct vcpu *v
/* Record that the guest page isn't shadowed any more (in this type) */
if ( t == SH_type_fl1_shadow )
{
- gfn_t gfn = _gfn(mfn_to_shadow_page(smfn)->backpointer);
+ gfn_t gfn = _gfn(mfn_to_shadow_page(smfn)->u.sh.back);
delete_fl1_shadow_status(v, gfn, smfn);
}
else
{
- mfn_t gmfn = _mfn(mfn_to_shadow_page(smfn)->backpointer);
+ mfn_t gmfn = _mfn(mfn_to_shadow_page(smfn)->u.sh.back);
delete_shadow_status(v, gmfn, t, smfn);
shadow_demote(v, gmfn, t);
}
@@ -2054,7 +2051,7 @@ void sh_destroy_l1_shadow(struct vcpu *v
void sh_destroy_monitor_table(struct vcpu *v, mfn_t mmfn)
{
struct domain *d = v->domain;
- ASSERT(mfn_to_shadow_page(mmfn)->type == SH_type_monitor_table);
+ ASSERT(mfn_to_shadow_page(mmfn)->u.sh.type == SH_type_monitor_table);
#if (CONFIG_PAGING_LEVELS == 4) && (SHADOW_PAGING_LEVELS != 4)
{
@@ -2298,7 +2295,7 @@ static int validate_gl2e(struct vcpu *v,
#if SHADOW_PAGING_LEVELS == 3
reserved_xen_slot =
- ((mfn_to_shadow_page(sl2mfn)->type == SH_type_l2h_pae_shadow) &&
+ ((mfn_to_shadow_page(sl2mfn)->u.sh.type == SH_type_l2h_pae_shadow)
&&
(shadow_index
>= (L2_PAGETABLE_FIRST_XEN_SLOT & (L2_PAGETABLE_ENTRIES-1))));
#else /* SHADOW_PAGING_LEVELS == 2 */
@@ -2352,7 +2349,7 @@ static int validate_gl1e(struct vcpu *v,
result |= shadow_set_l1e(v, sl1p, new_sl1e, sl1mfn);
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
- gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->backpointer);
+ gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->u.sh.back);
if ( mfn_valid(gl1mfn)
&& mfn_is_out_of_sync(gl1mfn) )
{
@@ -2437,7 +2434,7 @@ int sh_safe_not_to_sync(struct vcpu *v,
/* Up to l2 */
sp = mfn_to_shadow_page(smfn);
- if ( sp->count != 1 || !sp->up )
+ if ( sp->u.sh.count != 1 || !sp->up )
return 0;
smfn = _mfn(sp->up >> PAGE_SHIFT);
ASSERT(mfn_valid(smfn));
@@ -2445,14 +2442,14 @@ int sh_safe_not_to_sync(struct vcpu *v,
#if (SHADOW_PAGING_LEVELS == 4)
/* up to l3 */
sp = mfn_to_shadow_page(smfn);
- if ( sp->count != 1 || !sp->up )
+ if ( sp->u.sh.count != 1 || !sp->up )
return 0;
smfn = _mfn(sp->up >> PAGE_SHIFT);
ASSERT(mfn_valid(smfn));
/* up to l4 */
sp = mfn_to_shadow_page(smfn);
- if ( sp->count != 1
+ if ( sp->u.sh.count != 1
|| sh_type_is_pinnable(v, SH_type_l3_64_shadow) || !sp->up )
return 0;
smfn = _mfn(sp->up >> PAGE_SHIFT);
@@ -2971,7 +2968,7 @@ static int sh_page_fault(struct vcpu *v,
sizeof(sl2e)) != 0)
|| !(shadow_l2e_get_flags(sl2e) & _PAGE_PRESENT)
|| !mfn_valid(gl1mfn = _mfn(mfn_to_shadow_page(
- shadow_l2e_get_mfn(sl2e))->backpointer))
+ shadow_l2e_get_mfn(sl2e))->u.sh.back))
|| unlikely(mfn_is_out_of_sync(gl1mfn)) )
{
/* Hit the slow path as if there had been no
@@ -3523,7 +3520,7 @@ sh_invlpg(struct vcpu *v, unsigned long
// easier than invalidating all of the individual 4K pages).
//
sl1mfn = shadow_l2e_get_mfn(sl2e);
- if ( mfn_to_shadow_page(sl1mfn)->type
+ if ( mfn_to_shadow_page(sl1mfn)->u.sh.type
== SH_type_fl1_shadow )
{
flush_tlb_local();
@@ -3533,7 +3530,7 @@ sh_invlpg(struct vcpu *v, unsigned long
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
/* Check to see if the SL1 is out of sync. */
{
- mfn_t gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->backpointer);
+ mfn_t gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->u.sh.back);
struct page_info *pg = mfn_to_page(gl1mfn);
if ( mfn_valid(gl1mfn)
&& page_is_out_of_sync(pg) )
@@ -3563,7 +3560,7 @@ sh_invlpg(struct vcpu *v, unsigned long
}
sl1mfn = shadow_l2e_get_mfn(sl2e);
- gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->backpointer);
+ gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->u.sh.back);
pg = mfn_to_page(gl1mfn);
if ( likely(sh_mfn_is_a_page_table(gl1mfn)
@@ -3968,7 +3965,7 @@ sh_set_toplevel_shadow(struct vcpu *v,
/* Need to repin the old toplevel shadow if it's been unpinned
* by shadow_prealloc(): in PV mode we're still running on this
* shadow and it's not safe to free it yet. */
- if ( !mfn_to_shadow_page(old_smfn)->pinned && !sh_pin(v, old_smfn) )
+ if ( !mfn_to_shadow_page(old_smfn)->u.sh.pinned && !sh_pin(v,
old_smfn) )
{
SHADOW_ERROR("can't re-pin %#lx\n", mfn_x(old_smfn));
domain_crash(v->domain);
@@ -4269,9 +4266,9 @@ int sh_rm_write_access_from_sl1p(struct
sp = mfn_to_shadow_page(smfn);
- if ( sp->mbz != 0
- || (sp->type != SH_type_l1_shadow
- && sp->type != SH_type_fl1_shadow) )
+ if ( sp->count_info != 0
+ || (sp->u.sh.type != SH_type_l1_shadow
+ && sp->u.sh.type != SH_type_fl1_shadow) )
goto fail;
sl1p = sh_map_domain_page(smfn);
@@ -4410,7 +4407,7 @@ int sh_rm_mappings_from_l1(struct vcpu *
void sh_clear_shadow_entry(struct vcpu *v, void *ep, mfn_t smfn)
/* Blank out a single shadow entry */
{
- switch ( mfn_to_shadow_page(smfn)->type )
+ switch ( mfn_to_shadow_page(smfn)->u.sh.type )
{
case SH_type_l1_shadow:
(void) shadow_set_l1e(v, ep, shadow_l1e_empty(), smfn); break;
@@ -4443,7 +4440,7 @@ int sh_remove_l1_shadow(struct vcpu *v,
&& (mfn_x(shadow_l2e_get_mfn(*sl2e)) == mfn_x(sl1mfn)) )
{
(void) shadow_set_l2e(v, sl2e, shadow_l2e_empty(), sl2mfn);
- if ( mfn_to_shadow_page(sl1mfn)->type == 0 )
+ if ( mfn_to_shadow_page(sl1mfn)->u.sh.type == 0 )
/* This breaks us cleanly out of the FOREACH macro */
done = 1;
}
@@ -4466,7 +4463,7 @@ int sh_remove_l2_shadow(struct vcpu *v,
&& (mfn_x(shadow_l3e_get_mfn(*sl3e)) == mfn_x(sl2mfn)) )
{
(void) shadow_set_l3e(v, sl3e, shadow_l3e_empty(), sl3mfn);
- if ( mfn_to_shadow_page(sl2mfn)->type == 0 )
+ if ( mfn_to_shadow_page(sl2mfn)->u.sh.type == 0 )
/* This breaks us cleanly out of the FOREACH macro */
done = 1;
}
@@ -4488,7 +4485,7 @@ int sh_remove_l3_shadow(struct vcpu *v,
&& (mfn_x(shadow_l4e_get_mfn(*sl4e)) == mfn_x(sl3mfn)) )
{
(void) shadow_set_l4e(v, sl4e, shadow_l4e_empty(), sl4mfn);
- if ( mfn_to_shadow_page(sl3mfn)->type == 0 )
+ if ( mfn_to_shadow_page(sl3mfn)->u.sh.type == 0 )
/* This breaks us cleanly out of the FOREACH macro */
done = 1;
}
@@ -4890,7 +4887,7 @@ int sh_audit_l1_table(struct vcpu *v, mf
int done = 0;
/* Follow the backpointer */
- gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->backpointer);
+ gl1mfn = _mfn(mfn_to_shadow_page(sl1mfn)->u.sh.back);
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
/* Out-of-sync l1 shadows can contain anything: just check the OOS hash */
@@ -4980,7 +4977,7 @@ int sh_audit_l2_table(struct vcpu *v, mf
int done = 0;
/* Follow the backpointer */
- gl2mfn = _mfn(mfn_to_shadow_page(sl2mfn)->backpointer);
+ gl2mfn = _mfn(mfn_to_shadow_page(sl2mfn)->u.sh.back);
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
/* Only L1's may be out of sync. */
@@ -5029,7 +5026,7 @@ int sh_audit_l3_table(struct vcpu *v, mf
int done = 0;
/* Follow the backpointer */
- gl3mfn = _mfn(mfn_to_shadow_page(sl3mfn)->backpointer);
+ gl3mfn = _mfn(mfn_to_shadow_page(sl3mfn)->u.sh.back);
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
/* Only L1's may be out of sync. */
@@ -5076,7 +5073,7 @@ int sh_audit_l4_table(struct vcpu *v, mf
int done = 0;
/* Follow the backpointer */
- gl4mfn = _mfn(mfn_to_shadow_page(sl4mfn)->backpointer);
+ gl4mfn = _mfn(mfn_to_shadow_page(sl4mfn)->u.sh.back);
#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
/* Only L1's may be out of sync. */
--- 2009-01-30.orig/xen/arch/x86/mm/shadow/private.h 2009-01-28
08:53:49.000000000 +0100
+++ 2009-01-30/xen/arch/x86/mm/shadow/private.h 2009-01-30 10:19:16.000000000
+0100
@@ -220,60 +220,6 @@ extern void shadow_audit_tables(struct v
#undef GUEST_LEVELS
#endif /* CONFIG_PAGING_LEVELS == 4 */
-/******************************************************************************
- * Page metadata for shadow pages.
- */
-
-struct shadow_page_info
-{
- union {
- /* Ensures that shadow_page_info is same size as page_info. */
- struct page_info page_info;
-
- struct {
- union {
- /* When in use, guest page we're a shadow of */
- unsigned long backpointer;
- /* When free, order of the freelist we're on */
- unsigned int order;
- };
- union {
- /* When in use, next shadow in this hash chain */
- struct shadow_page_info *next_shadow;
- /* When free, TLB flush time when freed */
- u32 tlbflush_timestamp;
- };
- struct {
- unsigned long mbz; /* Must be zero: count_info is here. */
- unsigned long type:5; /* What kind of shadow is this? */
- unsigned long pinned:1; /* Is the shadow pinned? */
- unsigned long count:26; /* Reference count */
- } __attribute__((packed));
- union {
- /* For unused shadow pages, a list of pages of this order; for
- * pinnable shadows, if pinned, a list of other pinned shadows
- * (see sh_type_is_pinnable() below for the definition of
- * "pinnable" shadow types). */
- struct list_head list;
- /* For non-pinnable shadows, a higher entry that points
- * at us. */
- paddr_t up;
- };
- };
- };
-};
-
-/* The structure above *must* be no larger than a struct page_info
- * from mm.h, since we'll be using the same space in the frametable.
- * Also, the mbz field must line up with the count_info field of normal
- * pages, so they cannot be successfully get_page()d. */
-static inline void shadow_check_page_struct_offsets(void) {
- BUILD_BUG_ON(sizeof (struct shadow_page_info) !=
- sizeof (struct page_info));
- BUILD_BUG_ON(offsetof(struct shadow_page_info, mbz) !=
- offsetof(struct page_info, count_info));
-};
-
/* Shadow type codes */
#define SH_type_none (0U) /* on the shadow free list */
#define SH_type_min_shadow (1U)
@@ -532,13 +478,13 @@ mfn_t oos_snapshot_lookup(struct vcpu *v
// in order to make it work with our mfn type.
#undef mfn_to_page
#define mfn_to_page(_m) (frame_table + mfn_x(_m))
-#define mfn_to_shadow_page(_m) ((struct shadow_page_info *)mfn_to_page(_m))
+#define mfn_to_shadow_page mfn_to_page
// Override page_to_mfn from asm/page.h, which was #include'd above,
// in order to make it work with our mfn type.
#undef page_to_mfn
#define page_to_mfn(_pg) (_mfn((_pg) - frame_table))
-#define shadow_page_to_mfn(_spg) (page_to_mfn((struct page_info *)_spg))
+#define shadow_page_to_mfn page_to_mfn
// Override mfn_valid from asm/page.h, which was #include'd above,
// in order to make it work with our mfn type.
@@ -679,22 +625,22 @@ static inline int sh_get_ref(struct vcpu
ASSERT(mfn_valid(smfn));
- x = sp->count;
+ x = sp->u.sh.count;
nx = x + 1;
if ( unlikely(nx >= 1U<<26) )
{
- SHADOW_PRINTK("shadow ref overflow, gmfn=%" PRtype_info " smfn=%lx\n",
- sp->backpointer, mfn_x(smfn));
+ SHADOW_PRINTK("shadow ref overflow, gmfn=%" PRpgmfn " smfn=%lx\n",
+ sp->u.sh.back, mfn_x(smfn));
return 0;
}
/* Guarded by the shadow lock, so no need for atomic update */
- sp->count = nx;
+ sp->u.sh.count = nx;
/* We remember the first shadow entry that points to each shadow. */
if ( entry_pa != 0
- && !sh_type_is_pinnable(v, sp->type)
+ && !sh_type_is_pinnable(v, sp->u.sh.type)
&& sp->up == 0 )
sp->up = entry_pa;
@@ -710,26 +656,26 @@ static inline void sh_put_ref(struct vcp
struct shadow_page_info *sp = mfn_to_shadow_page(smfn);
ASSERT(mfn_valid(smfn));
- ASSERT(sp->mbz == 0);
+ ASSERT(sp->count_info == 0);
/* If this is the entry in the up-pointer, remove it */
if ( entry_pa != 0
- && !sh_type_is_pinnable(v, sp->type)
+ && !sh_type_is_pinnable(v, sp->u.sh.type)
&& sp->up == entry_pa )
sp->up = 0;
- x = sp->count;
+ x = sp->u.sh.count;
nx = x - 1;
if ( unlikely(x == 0) )
{
SHADOW_ERROR("shadow ref underflow, smfn=%lx oc=%08x t=%#x\n",
- mfn_x(smfn), sp->count, sp->type);
+ mfn_x(smfn), sp->u.sh.count, sp->u.sh.type);
BUG();
}
/* Guarded by the shadow lock, so no need for atomic update */
- sp->count = nx;
+ sp->u.sh.count = nx;
if ( unlikely(nx == 0) )
sh_destroy_shadow(v, smfn);
@@ -745,22 +691,22 @@ static inline int sh_pin(struct vcpu *v,
ASSERT(mfn_valid(smfn));
sp = mfn_to_shadow_page(smfn);
- ASSERT(sh_type_is_pinnable(v, sp->type));
- if ( sp->pinned )
+ ASSERT(sh_type_is_pinnable(v, sp->u.sh.type));
+ if ( sp->u.sh.pinned )
{
/* Already pinned: take it out of the pinned-list so it can go
* at the front */
- list_del(&sp->list);
+ page_list_del(sp, &v->domain->arch.paging.shadow.pinned_shadows);
}
else
{
/* Not pinned: pin it! */
if ( !sh_get_ref(v, smfn, 0) )
return 0;
- sp->pinned = 1;
+ sp->u.sh.pinned = 1;
}
/* Put it at the head of the list of pinned shadows */
- list_add(&sp->list, &v->domain->arch.paging.shadow.pinned_shadows);
+ page_list_add(sp, &v->domain->arch.paging.shadow.pinned_shadows);
return 1;
}
@@ -772,11 +718,11 @@ static inline void sh_unpin(struct vcpu
ASSERT(mfn_valid(smfn));
sp = mfn_to_shadow_page(smfn);
- ASSERT(sh_type_is_pinnable(v, sp->type));
- if ( sp->pinned )
+ ASSERT(sh_type_is_pinnable(v, sp->u.sh.type));
+ if ( sp->u.sh.pinned )
{
- sp->pinned = 0;
- list_del(&sp->list);
+ sp->u.sh.pinned = 0;
+ page_list_del(sp, &v->domain->arch.paging.shadow.pinned_shadows);
sp->up = 0; /* in case this stops being a pinnable type in future */
sh_put_ref(v, smfn, 0);
}
--- 2009-01-30.orig/xen/include/asm-x86/mm.h 2009-01-30 10:13:53.000000000
+0100
+++ 2009-01-30/xen/include/asm-x86/mm.h 2009-01-30 10:14:47.000000000 +0100
@@ -17,19 +17,39 @@
*/
#define PFN_ORDER(_pfn) ((_pfn)->u.free.order)
+/*
+ * This definition is solely for the use in struct page_info (and
+ * struct page_list_head), intended to allow easy adjustment once x86-64
+ * wants to support more than 16Tb.
+ * 'unsigned long' should be used for MFNs everywhere else.
+ */
+#define __mfn_t unsigned int
+#define PRpgmfn "08x"
+
#ifndef __i386__
# undef page_list_entry
struct page_list_entry
{
- unsigned int next, prev;
- unsigned long _pad_for_sh_; /* until struct shadow_page_info gets updated
*/
+ __mfn_t next, prev;
};
#endif
struct page_info
+/* Until all uses of the old type get cleaned up: */
+#define shadow_page_info page_info
{
- /* Each frame can be threaded onto a doubly-linked list. */
- struct page_list_entry list;
+ union {
+ /* Each frame can be threaded onto a doubly-linked list.
+ *
+ * For unused shadow pages, a list of pages of this order; for
+ * pinnable shadows, if pinned, a list of other pinned shadows
+ * (see sh_type_is_pinnable() below for the definition of
+ * "pinnable" shadow types).
+ */
+ struct page_list_entry list;
+ /* For non-pinnable shadows, a higher entry that points at us. */
+ paddr_t up;
+ };
/* Reference count and various PGC_xxx flags and fields. */
unsigned long count_info;
@@ -45,6 +65,19 @@ struct page_info
unsigned long type_info;
} inuse;
+ /* Page is in use as a shadow: count_info == 0. */
+ struct {
+ unsigned long type:5; /* What kind of shadow is this? */
+ unsigned long pinned:1; /* Is the shadow pinned? */
+ unsigned long count:26; /* Reference count */
+ union {
+ /* When in use, GMFN of guest page we're a shadow of. */
+ __mfn_t back;
+ /* When free, order of the freelist we're on. */
+ unsigned int order;
+ };
+ } sh;
+
/* Page is on a free list: ((count_info & PGC_count_mask) == 0). */
struct {
/* Order-size of the free chunk this page is the head of. */
@@ -104,9 +137,14 @@ struct page_info
* tracked for TLB-flush avoidance when a guest runs in shadow mode.
*/
u32 shadow_flags;
+
+ /* When in use as a shadow, next shadow in this hash chain. */
+ struct shadow_page_info *next_shadow;
};
};
+#undef __mfn_t
+
#define PG_shift(idx) (BITS_PER_LONG - (idx))
#define PG_mask(x, idx) (x ## UL << PG_shift(idx))
--- 2009-01-30.orig/xen/include/asm-x86/domain.h 2009-01-30
10:13:53.000000000 +0100
+++ 2009-01-30/xen/include/asm-x86/domain.h 2009-01-30 10:14:47.000000000
+0100
@@ -79,10 +79,10 @@ struct shadow_domain {
int locker; /* processor which holds the lock */
const char *locker_function; /* Func that took it */
unsigned int opt_flags; /* runtime tunable optimizations on/off */
- struct list_head pinned_shadows;
+ struct page_list_head pinned_shadows;
/* Memory allocation */
- struct list_head freelists[SHADOW_MAX_ORDER + 1];
+ struct page_list_head freelists[SHADOW_MAX_ORDER + 1];
struct page_list_head p2m_freelist;
unsigned int total_pages; /* number of pages allocated */
unsigned int free_pages; /* number of pages on freelists */
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