|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 extra 05/11] x86/mm: move pv_{alloc, free}_page_type
Move them and the helper functions to pv/mm.c. Use bool in the moved
code where appropriate.
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
xen/arch/x86/domain.c | 1 +
xen/arch/x86/mm.c | 492 --------------------------------------------
xen/arch/x86/pv/mm.c | 491 +++++++++++++++++++++++++++++++++++++++++++
xen/include/asm-x86/mm.h | 3 -
xen/include/asm-x86/pv/mm.h | 12 ++
5 files changed, 504 insertions(+), 495 deletions(-)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index d92a930d29..36225631eb 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -64,6 +64,7 @@
#include <compat/vcpu.h>
#include <asm/psr.h>
#include <asm/pv/domain.h>
+#include <asm/pv/mm.h>
#include <asm/pv/processor.h>
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 5545a6f4de..ac0e0ba346 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -514,21 +514,6 @@ static void invalidate_shadow_ldt(struct vcpu *v, int
flush)
}
-static int alloc_segdesc_page(struct page_info *page)
-{
- const struct domain *owner = page_get_owner(page);
- struct desc_struct *descs = __map_domain_page(page);
- unsigned i;
-
- for ( i = 0; i < 512; i++ )
- if ( unlikely(!check_descriptor(owner, &descs[i])) )
- break;
-
- unmap_domain_page(descs);
-
- return i == 512 ? 0 : -EINVAL;
-}
-
bool get_page_from_mfn(mfn_t mfn, struct domain *d)
{
struct page_info *page = mfn_to_page(mfn_x(mfn));
@@ -543,7 +528,6 @@ bool get_page_from_mfn(mfn_t mfn, struct domain *d)
return true;
}
-
int get_page_and_type_from_mfn(mfn_t mfn, unsigned long type, struct domain *d,
int partial, bool preemptible)
{
@@ -1169,172 +1153,6 @@ int put_page_from_l4e(l4_pgentry_t l4e, unsigned long
pfn, int partial,
return 1;
}
-static int alloc_l1_table(struct page_info *page)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l1_pgentry_t *pl1e;
- unsigned int i;
- int ret = 0;
-
- pl1e = map_domain_page(_mfn(pfn));
-
- for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
- {
- switch ( ret = get_page_from_l1e(pl1e[i], d, d) )
- {
- default:
- goto fail;
- case 0:
- break;
- case _PAGE_RW ... _PAGE_RW | PAGE_CACHE_ATTRS:
- ASSERT(!(ret & ~(_PAGE_RW | PAGE_CACHE_ATTRS)));
- l1e_flip_flags(pl1e[i], ret);
- break;
- }
-
- adjust_guest_l1e(pl1e[i], d);
- }
-
- unmap_domain_page(pl1e);
- return 0;
-
- fail:
- gdprintk(XENLOG_WARNING, "Failure in alloc_l1_table: slot %#x\n", i);
- while ( i-- > 0 )
- put_page_from_l1e(pl1e[i], d);
-
- unmap_domain_page(pl1e);
- return ret;
-}
-
-static int alloc_l2_table(struct page_info *page, unsigned long type,
- int preemptible)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l2_pgentry_t *pl2e;
- unsigned int i;
- int rc = 0;
-
- pl2e = map_domain_page(_mfn(pfn));
-
- for ( i = page->nr_validated_ptes; i < L2_PAGETABLE_ENTRIES; i++ )
- {
- if ( preemptible && i > page->nr_validated_ptes
- && hypercall_preempt_check() )
- {
- page->nr_validated_ptes = i;
- rc = -ERESTART;
- break;
- }
-
- if ( !is_guest_l2_slot(d, type, i) ||
- (rc = get_page_from_l2e(pl2e[i], pfn, d)) > 0 )
- continue;
-
- if ( rc < 0 )
- {
- gdprintk(XENLOG_WARNING, "Failure in alloc_l2_table: slot %#x\n",
i);
- while ( i-- > 0 )
- if ( is_guest_l2_slot(d, type, i) )
- put_page_from_l2e(pl2e[i], pfn);
- break;
- }
-
- adjust_guest_l2e(pl2e[i], d);
- }
-
- if ( rc >= 0 && (type & PGT_pae_xen_l2) )
- {
- /* Xen private mappings. */
- memcpy(&pl2e[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
- &compat_idle_pg_table_l2[
- l2_table_offset(HIRO_COMPAT_MPT_VIRT_START)],
- COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*pl2e));
- }
-
- unmap_domain_page(pl2e);
- return rc > 0 ? 0 : rc;
-}
-
-static int alloc_l3_table(struct page_info *page)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l3_pgentry_t *pl3e;
- unsigned int i;
- int rc = 0, partial = page->partial_pte;
-
- pl3e = map_domain_page(_mfn(pfn));
-
- /*
- * PAE guests allocate full pages, but aren't required to initialize
- * more than the first four entries; when running in compatibility
- * mode, however, the full page is visible to the MMU, and hence all
- * 512 entries must be valid/verified, which is most easily achieved
- * by clearing them out.
- */
- if ( is_pv_32bit_domain(d) )
- memset(pl3e + 4, 0, (L3_PAGETABLE_ENTRIES - 4) * sizeof(*pl3e));
-
- for ( i = page->nr_validated_ptes; i < L3_PAGETABLE_ENTRIES;
- i++, partial = 0 )
- {
- if ( is_pv_32bit_domain(d) && (i == 3) )
- {
- if ( !(l3e_get_flags(pl3e[i]) & _PAGE_PRESENT) ||
- (l3e_get_flags(pl3e[i]) & l3_disallow_mask(d)) )
- rc = -EINVAL;
- else
- rc = get_page_and_type_from_mfn(
- _mfn(l3e_get_pfn(pl3e[i])),
- PGT_l2_page_table | PGT_pae_xen_l2, d, partial, true);
- }
- else if ( !is_guest_l3_slot(i) ||
- (rc = get_page_from_l3e(pl3e[i], pfn, d, partial)) > 0 )
- continue;
-
- if ( rc == -ERESTART )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = partial ?: 1;
- }
- else if ( rc == -EINTR && i )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = 0;
- rc = -ERESTART;
- }
- if ( rc < 0 )
- break;
-
- adjust_guest_l3e(pl3e[i], d);
- }
-
- if ( rc >= 0 && !pv_create_pae_xen_mappings(d, pl3e) )
- rc = -EINVAL;
- if ( rc < 0 && rc != -ERESTART && rc != -EINTR )
- {
- gdprintk(XENLOG_WARNING, "Failure in alloc_l3_table: slot %#x\n", i);
- if ( i )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = 0;
- current->arch.old_guest_table = page;
- }
- while ( i-- > 0 )
- {
- if ( !is_guest_l3_slot(i) )
- continue;
- unadjust_guest_l3e(pl3e[i], d);
- }
- }
-
- unmap_domain_page(pl3e);
- return rc > 0 ? 0 : rc;
-}
-
bool fill_ro_mpt(unsigned long mfn)
{
l4_pgentry_t *l4tab = map_domain_page(_mfn(mfn));
@@ -1359,188 +1177,6 @@ void zap_ro_mpt(unsigned long mfn)
unmap_domain_page(l4tab);
}
-static int alloc_l4_table(struct page_info *page)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l4_pgentry_t *pl4e = map_domain_page(_mfn(pfn));
- unsigned int i;
- int rc = 0, partial = page->partial_pte;
-
- for ( i = page->nr_validated_ptes; i < L4_PAGETABLE_ENTRIES;
- i++, partial = 0 )
- {
- if ( !is_guest_l4_slot(d, i) ||
- (rc = get_page_from_l4e(pl4e[i], pfn, d, partial)) > 0 )
- continue;
-
- if ( rc == -ERESTART )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = partial ?: 1;
- }
- else if ( rc < 0 )
- {
- if ( rc != -EINTR )
- gdprintk(XENLOG_WARNING,
- "Failure in alloc_l4_table: slot %#x\n", i);
- if ( i )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = 0;
- if ( rc == -EINTR )
- rc = -ERESTART;
- else
- {
- if ( current->arch.old_guest_table )
- page->nr_validated_ptes++;
- current->arch.old_guest_table = page;
- }
- }
- }
- if ( rc < 0 )
- {
- unmap_domain_page(pl4e);
- return rc;
- }
-
- adjust_guest_l4e(pl4e[i], d);
- }
-
- if ( rc >= 0 )
- {
- pv_init_guest_l4_table(pl4e, d, !VM_ASSIST(d, m2p_strict));
- atomic_inc(&d->arch.pv_domain.nr_l4_pages);
- rc = 0;
- }
- unmap_domain_page(pl4e);
-
- return rc;
-}
-
-static void free_l1_table(struct page_info *page)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l1_pgentry_t *pl1e;
- unsigned int i;
-
- pl1e = map_domain_page(_mfn(pfn));
-
- for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
- put_page_from_l1e(pl1e[i], d);
-
- unmap_domain_page(pl1e);
-}
-
-
-static int free_l2_table(struct page_info *page, int preemptible)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l2_pgentry_t *pl2e;
- unsigned int i = page->nr_validated_ptes - 1;
- int err = 0;
-
- pl2e = map_domain_page(_mfn(pfn));
-
- ASSERT(page->nr_validated_ptes);
- do {
- if ( is_guest_l2_slot(d, page->u.inuse.type_info, i) &&
- put_page_from_l2e(pl2e[i], pfn) == 0 &&
- preemptible && i && hypercall_preempt_check() )
- {
- page->nr_validated_ptes = i;
- err = -ERESTART;
- }
- } while ( !err && i-- );
-
- unmap_domain_page(pl2e);
-
- if ( !err )
- page->u.inuse.type_info &= ~PGT_pae_xen_l2;
-
- return err;
-}
-
-static int free_l3_table(struct page_info *page)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l3_pgentry_t *pl3e;
- int rc = 0, partial = page->partial_pte;
- unsigned int i = page->nr_validated_ptes - !partial;
-
- pl3e = map_domain_page(_mfn(pfn));
-
- do {
- if ( is_guest_l3_slot(i) )
- {
- rc = put_page_from_l3e(pl3e[i], pfn, partial, 0);
- if ( rc < 0 )
- break;
- partial = 0;
- if ( rc > 0 )
- continue;
- unadjust_guest_l3e(pl3e[i], d);
- }
- } while ( i-- );
-
- unmap_domain_page(pl3e);
-
- if ( rc == -ERESTART )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = partial ?: -1;
- }
- else if ( rc == -EINTR && i < L3_PAGETABLE_ENTRIES - 1 )
- {
- page->nr_validated_ptes = i + 1;
- page->partial_pte = 0;
- rc = -ERESTART;
- }
- return rc > 0 ? 0 : rc;
-}
-
-static int free_l4_table(struct page_info *page)
-{
- struct domain *d = page_get_owner(page);
- unsigned long pfn = page_to_mfn(page);
- l4_pgentry_t *pl4e = map_domain_page(_mfn(pfn));
- int rc = 0, partial = page->partial_pte;
- unsigned int i = page->nr_validated_ptes - !partial;
-
- do {
- if ( is_guest_l4_slot(d, i) )
- rc = put_page_from_l4e(pl4e[i], pfn, partial, 0);
- if ( rc < 0 )
- break;
- partial = 0;
- } while ( i-- );
-
- if ( rc == -ERESTART )
- {
- page->nr_validated_ptes = i;
- page->partial_pte = partial ?: -1;
- }
- else if ( rc == -EINTR && i < L4_PAGETABLE_ENTRIES - 1 )
- {
- page->nr_validated_ptes = i + 1;
- page->partial_pte = 0;
- rc = -ERESTART;
- }
-
- unmap_domain_page(pl4e);
-
- if ( rc >= 0 )
- {
- atomic_dec(&d->arch.pv_domain.nr_l4_pages);
- rc = 0;
- }
-
- return rc;
-}
-
int page_lock(struct page_info *page)
{
unsigned long x, nx;
@@ -1955,134 +1591,6 @@ void get_page_light(struct page_info *page)
while ( unlikely(y != x) );
}
-static int pv_alloc_page_type(struct page_info *page, unsigned long type,
- bool preemptible)
-{
- struct domain *owner = page_get_owner(page);
- int rc;
-
- /* A page table is dirtied when its type count becomes non-zero. */
- if ( likely(owner != NULL) )
- paging_mark_dirty(owner, _mfn(page_to_mfn(page)));
-
- switch ( type & PGT_type_mask )
- {
- case PGT_l1_page_table:
- rc = alloc_l1_table(page);
- break;
- case PGT_l2_page_table:
- rc = alloc_l2_table(page, type, preemptible);
- break;
- case PGT_l3_page_table:
- ASSERT(preemptible);
- rc = alloc_l3_table(page);
- break;
- case PGT_l4_page_table:
- ASSERT(preemptible);
- rc = alloc_l4_table(page);
- break;
- case PGT_seg_desc_page:
- rc = alloc_segdesc_page(page);
- break;
- default:
- printk("Bad type in alloc_page_type %lx t=%" PRtype_info " c=%lx\n",
- type, page->u.inuse.type_info,
- page->count_info);
- rc = -EINVAL;
- BUG();
- }
-
- /* No need for atomic update of type_info here: noone else updates it. */
- smp_wmb();
- switch ( rc )
- {
- case 0:
- page->u.inuse.type_info |= PGT_validated;
- break;
- case -EINTR:
- ASSERT((page->u.inuse.type_info &
- (PGT_count_mask|PGT_validated|PGT_partial)) == 1);
- page->u.inuse.type_info &= ~PGT_count_mask;
- break;
- default:
- ASSERT(rc < 0);
- gdprintk(XENLOG_WARNING, "Error while validating mfn %" PRI_mfn
- " (pfn %" PRI_pfn ") for type %" PRtype_info
- ": caf=%08lx taf=%" PRtype_info "\n",
- page_to_mfn(page), get_gpfn_from_mfn(page_to_mfn(page)),
- type, page->count_info, page->u.inuse.type_info);
- if ( page != current->arch.old_guest_table )
- page->u.inuse.type_info = 0;
- else
- {
- ASSERT((page->u.inuse.type_info &
- (PGT_count_mask | PGT_validated)) == 1);
- case -ERESTART:
- get_page_light(page);
- page->u.inuse.type_info |= PGT_partial;
- }
- break;
- }
-
- return rc;
-}
-
-
-int pv_free_page_type(struct page_info *page, unsigned long type,
- bool preemptible)
-{
- struct domain *owner = page_get_owner(page);
- unsigned long gmfn;
- int rc;
-
- if ( likely(owner != NULL) && unlikely(paging_mode_enabled(owner)) )
- {
- /* A page table is dirtied when its type count becomes zero. */
- paging_mark_dirty(owner, _mfn(page_to_mfn(page)));
-
- ASSERT(!shadow_mode_refcounts(owner));
-
- gmfn = mfn_to_gmfn(owner, page_to_mfn(page));
- ASSERT(VALID_M2P(gmfn));
- /* Page sharing not supported for shadowed domains */
- if(!SHARED_M2P(gmfn))
- shadow_remove_all_shadows(owner, _mfn(gmfn));
- }
-
- if ( !(type & PGT_partial) )
- {
- page->nr_validated_ptes = 1U << PAGETABLE_ORDER;
- page->partial_pte = 0;
- }
-
- switch ( type & PGT_type_mask )
- {
- case PGT_l1_page_table:
- free_l1_table(page);
- rc = 0;
- break;
- case PGT_l2_page_table:
- rc = free_l2_table(page, preemptible);
- break;
- case PGT_l3_page_table:
- ASSERT(preemptible);
- rc = free_l3_table(page);
- break;
- case PGT_l4_page_table:
- ASSERT(preemptible);
- rc = free_l4_table(page);
- break;
- default:
- gdprintk(XENLOG_WARNING, "type %" PRtype_info " mfn %" PRI_mfn "\n",
- type, page_to_mfn(page));
- rc = -EINVAL;
- BUG();
- }
-
- return rc;
-}
-
-
static int __put_final_page_type(
struct page_info *page, unsigned long type, int preemptible)
{
diff --git a/xen/arch/x86/pv/mm.c b/xen/arch/x86/pv/mm.c
index 46e1fcf4e5..f0393b9e3c 100644
--- a/xen/arch/x86/pv/mm.c
+++ b/xen/arch/x86/pv/mm.c
@@ -20,10 +20,13 @@
* along with this program; If not, see <http://www.gnu.org/licenses/>.
*/
+#include <xen/event.h>
#include <xen/guest_access.h>
+#include <asm/mm.h>
#include <asm/pv/mm.h>
#include <asm/setup.h>
+#include <asm/shadow.h>
/*
* PTE updates can be done with ordinary writes except:
@@ -251,6 +254,494 @@ bool pv_create_pae_xen_mappings(struct domain *d,
l3_pgentry_t *pl3e)
return true;
}
+static int alloc_l1_table(struct page_info *page)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l1_pgentry_t *pl1e;
+ unsigned int i;
+ int ret = 0;
+
+ pl1e = map_domain_page(_mfn(pfn));
+
+ for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
+ {
+ switch ( ret = get_page_from_l1e(pl1e[i], d, d) )
+ {
+ default:
+ goto fail;
+ case 0:
+ break;
+ case _PAGE_RW ... _PAGE_RW | PAGE_CACHE_ATTRS:
+ ASSERT(!(ret & ~(_PAGE_RW | PAGE_CACHE_ATTRS)));
+ l1e_flip_flags(pl1e[i], ret);
+ break;
+ }
+
+ adjust_guest_l1e(pl1e[i], d);
+ }
+
+ unmap_domain_page(pl1e);
+ return 0;
+
+ fail:
+ gdprintk(XENLOG_WARNING, "Failure in alloc_l1_table: slot %#x\n", i);
+ while ( i-- > 0 )
+ put_page_from_l1e(pl1e[i], d);
+
+ unmap_domain_page(pl1e);
+ return ret;
+}
+
+static int alloc_l2_table(struct page_info *page, unsigned long type,
+ bool preemptible)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l2_pgentry_t *pl2e;
+ unsigned int i;
+ int rc = 0;
+
+ pl2e = map_domain_page(_mfn(pfn));
+
+ for ( i = page->nr_validated_ptes; i < L2_PAGETABLE_ENTRIES; i++ )
+ {
+ if ( preemptible && i > page->nr_validated_ptes
+ && hypercall_preempt_check() )
+ {
+ page->nr_validated_ptes = i;
+ rc = -ERESTART;
+ break;
+ }
+
+ if ( !is_guest_l2_slot(d, type, i) ||
+ (rc = get_page_from_l2e(pl2e[i], pfn, d)) > 0 )
+ continue;
+
+ if ( rc < 0 )
+ {
+ gdprintk(XENLOG_WARNING, "Failure in alloc_l2_table: slot %#x\n",
i);
+ while ( i-- > 0 )
+ if ( is_guest_l2_slot(d, type, i) )
+ put_page_from_l2e(pl2e[i], pfn);
+ break;
+ }
+
+ adjust_guest_l2e(pl2e[i], d);
+ }
+
+ if ( rc >= 0 && (type & PGT_pae_xen_l2) )
+ {
+ /* Xen private mappings. */
+ memcpy(&pl2e[COMPAT_L2_PAGETABLE_FIRST_XEN_SLOT(d)],
+ &compat_idle_pg_table_l2[
+ l2_table_offset(HIRO_COMPAT_MPT_VIRT_START)],
+ COMPAT_L2_PAGETABLE_XEN_SLOTS(d) * sizeof(*pl2e));
+ }
+
+ unmap_domain_page(pl2e);
+ return rc > 0 ? 0 : rc;
+}
+
+static int alloc_l3_table(struct page_info *page)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l3_pgentry_t *pl3e;
+ unsigned int i;
+ int rc = 0, partial = page->partial_pte;
+
+ pl3e = map_domain_page(_mfn(pfn));
+
+ /*
+ * PAE guests allocate full pages, but aren't required to initialize
+ * more than the first four entries; when running in compatibility
+ * mode, however, the full page is visible to the MMU, and hence all
+ * 512 entries must be valid/verified, which is most easily achieved
+ * by clearing them out.
+ */
+ if ( is_pv_32bit_domain(d) )
+ memset(pl3e + 4, 0, (L3_PAGETABLE_ENTRIES - 4) * sizeof(*pl3e));
+
+ for ( i = page->nr_validated_ptes; i < L3_PAGETABLE_ENTRIES;
+ i++, partial = 0 )
+ {
+ if ( is_pv_32bit_domain(d) && (i == 3) )
+ {
+ if ( !(l3e_get_flags(pl3e[i]) & _PAGE_PRESENT) ||
+ (l3e_get_flags(pl3e[i]) & l3_disallow_mask(d)) )
+ rc = -EINVAL;
+ else
+ rc = get_page_and_type_from_mfn(
+ _mfn(l3e_get_pfn(pl3e[i])),
+ PGT_l2_page_table | PGT_pae_xen_l2, d, partial, true);
+ }
+ else if ( !is_guest_l3_slot(i) ||
+ (rc = get_page_from_l3e(pl3e[i], pfn, d, partial)) > 0 )
+ continue;
+
+ if ( rc == -ERESTART )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = partial ?: 1;
+ }
+ else if ( rc == -EINTR && i )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = 0;
+ rc = -ERESTART;
+ }
+ if ( rc < 0 )
+ break;
+
+ adjust_guest_l3e(pl3e[i], d);
+ }
+
+ if ( rc >= 0 && !pv_create_pae_xen_mappings(d, pl3e) )
+ rc = -EINVAL;
+ if ( rc < 0 && rc != -ERESTART && rc != -EINTR )
+ {
+ gdprintk(XENLOG_WARNING, "Failure in alloc_l3_table: slot %#x\n", i);
+ if ( i )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = 0;
+ current->arch.old_guest_table = page;
+ }
+ while ( i-- > 0 )
+ {
+ if ( !is_guest_l3_slot(i) )
+ continue;
+ unadjust_guest_l3e(pl3e[i], d);
+ }
+ }
+
+ unmap_domain_page(pl3e);
+ return rc > 0 ? 0 : rc;
+}
+
+static int alloc_l4_table(struct page_info *page)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l4_pgentry_t *pl4e = map_domain_page(_mfn(pfn));
+ unsigned int i;
+ int rc = 0, partial = page->partial_pte;
+
+ for ( i = page->nr_validated_ptes; i < L4_PAGETABLE_ENTRIES;
+ i++, partial = 0 )
+ {
+ if ( !is_guest_l4_slot(d, i) ||
+ (rc = get_page_from_l4e(pl4e[i], pfn, d, partial)) > 0 )
+ continue;
+
+ if ( rc == -ERESTART )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = partial ?: 1;
+ }
+ else if ( rc < 0 )
+ {
+ if ( rc != -EINTR )
+ gdprintk(XENLOG_WARNING,
+ "Failure in alloc_l4_table: slot %#x\n", i);
+ if ( i )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = 0;
+ if ( rc == -EINTR )
+ rc = -ERESTART;
+ else
+ {
+ if ( current->arch.old_guest_table )
+ page->nr_validated_ptes++;
+ current->arch.old_guest_table = page;
+ }
+ }
+ }
+ if ( rc < 0 )
+ {
+ unmap_domain_page(pl4e);
+ return rc;
+ }
+
+ adjust_guest_l4e(pl4e[i], d);
+ }
+
+ if ( rc >= 0 )
+ {
+ pv_init_guest_l4_table(pl4e, d, !VM_ASSIST(d, m2p_strict));
+ atomic_inc(&d->arch.pv_domain.nr_l4_pages);
+ rc = 0;
+ }
+ unmap_domain_page(pl4e);
+
+ return rc;
+}
+
+static void free_l1_table(struct page_info *page)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l1_pgentry_t *pl1e;
+ unsigned int i;
+
+ pl1e = map_domain_page(_mfn(pfn));
+
+ for ( i = 0; i < L1_PAGETABLE_ENTRIES; i++ )
+ put_page_from_l1e(pl1e[i], d);
+
+ unmap_domain_page(pl1e);
+}
+
+static int free_l2_table(struct page_info *page, int preemptible)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l2_pgentry_t *pl2e;
+ unsigned int i = page->nr_validated_ptes - 1;
+ int err = 0;
+
+ pl2e = map_domain_page(_mfn(pfn));
+
+ ASSERT(page->nr_validated_ptes);
+ do {
+ if ( is_guest_l2_slot(d, page->u.inuse.type_info, i) &&
+ put_page_from_l2e(pl2e[i], pfn) == 0 &&
+ preemptible && i && hypercall_preempt_check() )
+ {
+ page->nr_validated_ptes = i;
+ err = -ERESTART;
+ }
+ } while ( !err && i-- );
+
+ unmap_domain_page(pl2e);
+
+ if ( !err )
+ page->u.inuse.type_info &= ~PGT_pae_xen_l2;
+
+ return err;
+}
+
+static int free_l3_table(struct page_info *page)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l3_pgentry_t *pl3e;
+ int rc = 0, partial = page->partial_pte;
+ unsigned int i = page->nr_validated_ptes - !partial;
+
+ pl3e = map_domain_page(_mfn(pfn));
+
+ do {
+ if ( is_guest_l3_slot(i) )
+ {
+ rc = put_page_from_l3e(pl3e[i], pfn, partial, 0);
+ if ( rc < 0 )
+ break;
+ partial = 0;
+ if ( rc > 0 )
+ continue;
+ unadjust_guest_l3e(pl3e[i], d);
+ }
+ } while ( i-- );
+
+ unmap_domain_page(pl3e);
+
+ if ( rc == -ERESTART )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = partial ?: -1;
+ }
+ else if ( rc == -EINTR && i < L3_PAGETABLE_ENTRIES - 1 )
+ {
+ page->nr_validated_ptes = i + 1;
+ page->partial_pte = 0;
+ rc = -ERESTART;
+ }
+ return rc > 0 ? 0 : rc;
+}
+
+static int free_l4_table(struct page_info *page)
+{
+ struct domain *d = page_get_owner(page);
+ unsigned long pfn = page_to_mfn(page);
+ l4_pgentry_t *pl4e = map_domain_page(_mfn(pfn));
+ int rc = 0, partial = page->partial_pte;
+ unsigned int i = page->nr_validated_ptes - !partial;
+
+ do {
+ if ( is_guest_l4_slot(d, i) )
+ rc = put_page_from_l4e(pl4e[i], pfn, partial, 0);
+ if ( rc < 0 )
+ break;
+ partial = 0;
+ } while ( i-- );
+
+ if ( rc == -ERESTART )
+ {
+ page->nr_validated_ptes = i;
+ page->partial_pte = partial ?: -1;
+ }
+ else if ( rc == -EINTR && i < L4_PAGETABLE_ENTRIES - 1 )
+ {
+ page->nr_validated_ptes = i + 1;
+ page->partial_pte = 0;
+ rc = -ERESTART;
+ }
+
+ unmap_domain_page(pl4e);
+
+ if ( rc >= 0 )
+ {
+ atomic_dec(&d->arch.pv_domain.nr_l4_pages);
+ rc = 0;
+ }
+
+ return rc;
+}
+
+static int alloc_segdesc_page(struct page_info *page)
+{
+ const struct domain *owner = page_get_owner(page);
+ struct desc_struct *descs = __map_domain_page(page);
+ unsigned i;
+
+ for ( i = 0; i < 512; i++ )
+ if ( unlikely(!check_descriptor(owner, &descs[i])) )
+ break;
+
+ unmap_domain_page(descs);
+
+ return i == 512 ? 0 : -EINVAL;
+}
+
+int pv_alloc_page_type(struct page_info *page, unsigned long type,
+ bool preemptible)
+{
+ struct domain *owner = page_get_owner(page);
+ int rc;
+
+ /* A page table is dirtied when its type count becomes non-zero. */
+ if ( likely(owner != NULL) )
+ paging_mark_dirty(owner, _mfn(page_to_mfn(page)));
+
+ switch ( type & PGT_type_mask )
+ {
+ case PGT_l1_page_table:
+ rc = alloc_l1_table(page);
+ break;
+ case PGT_l2_page_table:
+ rc = alloc_l2_table(page, type, preemptible);
+ break;
+ case PGT_l3_page_table:
+ ASSERT(preemptible);
+ rc = alloc_l3_table(page);
+ break;
+ case PGT_l4_page_table:
+ ASSERT(preemptible);
+ rc = alloc_l4_table(page);
+ break;
+ case PGT_seg_desc_page:
+ rc = alloc_segdesc_page(page);
+ break;
+ default:
+ printk("Bad type in alloc_page_type %lx t=%" PRtype_info " c=%lx\n",
+ type, page->u.inuse.type_info,
+ page->count_info);
+ rc = -EINVAL;
+ BUG();
+ }
+
+ /* No need for atomic update of type_info here: noone else updates it. */
+ smp_wmb();
+ switch ( rc )
+ {
+ case 0:
+ page->u.inuse.type_info |= PGT_validated;
+ break;
+ case -EINTR:
+ ASSERT((page->u.inuse.type_info &
+ (PGT_count_mask|PGT_validated|PGT_partial)) == 1);
+ page->u.inuse.type_info &= ~PGT_count_mask;
+ break;
+ default:
+ ASSERT(rc < 0);
+ gdprintk(XENLOG_WARNING, "Error while validating mfn %" PRI_mfn
+ " (pfn %" PRI_pfn ") for type %" PRtype_info
+ ": caf=%08lx taf=%" PRtype_info "\n",
+ page_to_mfn(page), get_gpfn_from_mfn(page_to_mfn(page)),
+ type, page->count_info, page->u.inuse.type_info);
+ if ( page != current->arch.old_guest_table )
+ page->u.inuse.type_info = 0;
+ else
+ {
+ ASSERT((page->u.inuse.type_info &
+ (PGT_count_mask | PGT_validated)) == 1);
+ case -ERESTART:
+ get_page_light(page);
+ page->u.inuse.type_info |= PGT_partial;
+ }
+ break;
+ }
+
+ return rc;
+}
+
+int pv_free_page_type(struct page_info *page, unsigned long type,
+ bool preemptible)
+{
+ struct domain *owner = page_get_owner(page);
+ unsigned long gmfn;
+ int rc;
+
+ if ( likely(owner != NULL) && unlikely(paging_mode_enabled(owner)) )
+ {
+ /* A page table is dirtied when its type count becomes zero. */
+ paging_mark_dirty(owner, _mfn(page_to_mfn(page)));
+
+ ASSERT(!shadow_mode_refcounts(owner));
+
+ gmfn = mfn_to_gmfn(owner, page_to_mfn(page));
+ ASSERT(VALID_M2P(gmfn));
+ /* Page sharing not supported for shadowed domains */
+ if(!SHARED_M2P(gmfn))
+ shadow_remove_all_shadows(owner, _mfn(gmfn));
+ }
+
+ if ( !(type & PGT_partial) )
+ {
+ page->nr_validated_ptes = 1U << PAGETABLE_ORDER;
+ page->partial_pte = 0;
+ }
+
+ switch ( type & PGT_type_mask )
+ {
+ case PGT_l1_page_table:
+ free_l1_table(page);
+ rc = 0;
+ break;
+ case PGT_l2_page_table:
+ rc = free_l2_table(page, preemptible);
+ break;
+ case PGT_l3_page_table:
+ ASSERT(preemptible);
+ rc = free_l3_table(page);
+ break;
+ case PGT_l4_page_table:
+ ASSERT(preemptible);
+ rc = free_l4_table(page);
+ break;
+ default:
+ gdprintk(XENLOG_WARNING, "type %" PRtype_info " mfn %" PRI_mfn "\n",
+ type, page_to_mfn(page));
+ rc = -EINVAL;
+ BUG();
+ }
+
+ return rc;
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index 6857651db1..7480341240 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -302,9 +302,6 @@ static inline void *__page_to_virt(const struct page_info
*pg)
(PAGE_SIZE / (sizeof(*pg) & -sizeof(*pg))));
}
-int pv_free_page_type(struct page_info *page, unsigned long type,
- bool preemptible);
-
bool_t fill_ro_mpt(unsigned long mfn);
void zap_ro_mpt(unsigned long mfn);
diff --git a/xen/include/asm-x86/pv/mm.h b/xen/include/asm-x86/pv/mm.h
index 0192580b41..841666e7a0 100644
--- a/xen/include/asm-x86/pv/mm.h
+++ b/xen/include/asm-x86/pv/mm.h
@@ -96,6 +96,11 @@ void pv_arch_init_memory(void);
int pv_new_guest_cr3(unsigned long pfn);
+int pv_alloc_page_type(struct page_info *page, unsigned long type,
+ bool preemptible);
+int pv_free_page_type(struct page_info *page, unsigned long type,
+ bool preemptible);
+
#else
#include <xen/errno.h>
@@ -126,6 +131,13 @@ static inline void pv_arch_init_memory(void) {}
static inline int pv_new_guest_cr3(unsigned long pfn) { return -EINVAL; }
+static inline int pv_alloc_page_type(struct page_info *page, unsigned long
type,
+ bool preemptible)
+{ return -EINVAL; }
+static inline int pv_free_page_type(struct page_info *page, unsigned long type,
+ bool preemptible)
+{ return -EINVAL; }
+
#endif
#endif /* __X86_PV_MM_H__ */
--
2.11.0
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |