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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 extra 07/11] x86/mm: move PV hypercalls to pv/mm-hypercalls.c
Also move pv_new_guest_cr3 there so that we don't have to export
mod_l1_entry.
Fix coding style issues. Change v to curr and d to currd where
appropriate.
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
I can't convince git diff to produce sensible diff for donate_page and
steal_page. Those functions aren't changed.
---
xen/arch/x86/mm.c | 1565 ++-------------------------------------
xen/arch/x86/pv/Makefile | 1 +
xen/arch/x86/pv/mm-hypercalls.c | 1461 ++++++++++++++++++++++++++++++++++++
3 files changed, 1531 insertions(+), 1496 deletions(-)
create mode 100644 xen/arch/x86/pv/mm-hypercalls.c
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 76ce5aef68..d232076459 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -1168,290 +1168,6 @@ void page_unlock(struct page_info *page)
} while ( (y = cmpxchg(&page->u.inuse.type_info, x, nx)) != x );
}
-/*
- * PTE flags that a guest may change without re-validating the PTE.
- * All other bits affect translation, caching, or Xen's safety.
- */
-#define FASTPATH_FLAG_WHITELIST \
- (_PAGE_NX_BIT | _PAGE_AVAIL_HIGH | _PAGE_AVAIL | _PAGE_GLOBAL | \
- _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_USER)
-
-/* Update the L1 entry at pl1e to new value nl1e. */
-static int mod_l1_entry(l1_pgentry_t *pl1e, l1_pgentry_t nl1e,
- unsigned long gl1mfn, int preserve_ad,
- struct vcpu *pt_vcpu, struct domain *pg_dom)
-{
- l1_pgentry_t ol1e;
- struct domain *pt_dom = pt_vcpu->domain;
- int rc = 0;
-
- if ( unlikely(__copy_from_user(&ol1e, pl1e, sizeof(ol1e)) != 0) )
- return -EFAULT;
-
- ASSERT(!paging_mode_refcounts(pt_dom));
-
- if ( l1e_get_flags(nl1e) & _PAGE_PRESENT )
- {
- /* Translate foreign guest addresses. */
- struct page_info *page = NULL;
-
- if ( unlikely(l1e_get_flags(nl1e) & l1_disallow_mask(pt_dom)) )
- {
- gdprintk(XENLOG_WARNING, "Bad L1 flags %x\n",
- l1e_get_flags(nl1e) & l1_disallow_mask(pt_dom));
- return -EINVAL;
- }
-
- if ( paging_mode_translate(pg_dom) )
- {
- page = get_page_from_gfn(pg_dom, l1e_get_pfn(nl1e), NULL,
P2M_ALLOC);
- if ( !page )
- return -EINVAL;
- nl1e = l1e_from_pfn(page_to_mfn(page), l1e_get_flags(nl1e));
- }
-
- /* Fast path for sufficiently-similar mappings. */
- if ( !l1e_has_changed(ol1e, nl1e, ~FASTPATH_FLAG_WHITELIST) )
- {
- adjust_guest_l1e(nl1e, pt_dom);
- rc = UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, pt_vcpu,
- preserve_ad);
- if ( page )
- put_page(page);
- return rc ? 0 : -EBUSY;
- }
-
- switch ( rc = get_page_from_l1e(nl1e, pt_dom, pg_dom) )
- {
- default:
- if ( page )
- put_page(page);
- return rc;
- case 0:
- break;
- case _PAGE_RW ... _PAGE_RW | PAGE_CACHE_ATTRS:
- ASSERT(!(rc & ~(_PAGE_RW | PAGE_CACHE_ATTRS)));
- l1e_flip_flags(nl1e, rc);
- rc = 0;
- break;
- }
- if ( page )
- put_page(page);
-
- adjust_guest_l1e(nl1e, pt_dom);
- if ( unlikely(!UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, pt_vcpu,
- preserve_ad)) )
- {
- ol1e = nl1e;
- rc = -EBUSY;
- }
- }
- else if ( unlikely(!UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, pt_vcpu,
- preserve_ad)) )
- {
- return -EBUSY;
- }
-
- put_page_from_l1e(ol1e, pt_dom);
- return rc;
-}
-
-
-/* Update the L2 entry at pl2e to new value nl2e. pl2e is within frame pfn. */
-static int mod_l2_entry(l2_pgentry_t *pl2e,
- l2_pgentry_t nl2e,
- unsigned long pfn,
- int preserve_ad,
- struct vcpu *vcpu)
-{
- l2_pgentry_t ol2e;
- struct domain *d = vcpu->domain;
- struct page_info *l2pg = mfn_to_page(pfn);
- unsigned long type = l2pg->u.inuse.type_info;
- int rc = 0;
-
- if ( unlikely(!is_guest_l2_slot(d, type, pgentry_ptr_to_slot(pl2e))) )
- {
- gdprintk(XENLOG_WARNING, "L2 update in Xen-private area, slot %#lx\n",
- pgentry_ptr_to_slot(pl2e));
- return -EPERM;
- }
-
- if ( unlikely(__copy_from_user(&ol2e, pl2e, sizeof(ol2e)) != 0) )
- return -EFAULT;
-
- if ( l2e_get_flags(nl2e) & _PAGE_PRESENT )
- {
- if ( unlikely(l2e_get_flags(nl2e) & L2_DISALLOW_MASK) )
- {
- gdprintk(XENLOG_WARNING, "Bad L2 flags %x\n",
- l2e_get_flags(nl2e) & L2_DISALLOW_MASK);
- return -EINVAL;
- }
-
- /* Fast path for sufficiently-similar mappings. */
- if ( !l2e_has_changed(ol2e, nl2e, ~FASTPATH_FLAG_WHITELIST) )
- {
- adjust_guest_l2e(nl2e, d);
- if ( UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu, preserve_ad) )
- return 0;
- return -EBUSY;
- }
-
- if ( unlikely((rc = get_page_from_l2e(nl2e, pfn, d)) < 0) )
- return rc;
-
- adjust_guest_l2e(nl2e, d);
- if ( unlikely(!UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu,
- preserve_ad)) )
- {
- ol2e = nl2e;
- rc = -EBUSY;
- }
- }
- else if ( unlikely(!UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu,
- preserve_ad)) )
- {
- return -EBUSY;
- }
-
- put_page_from_l2e(ol2e, pfn);
- return rc;
-}
-
-/* Update the L3 entry at pl3e to new value nl3e. pl3e is within frame pfn. */
-static int mod_l3_entry(l3_pgentry_t *pl3e,
- l3_pgentry_t nl3e,
- unsigned long pfn,
- int preserve_ad,
- struct vcpu *vcpu)
-{
- l3_pgentry_t ol3e;
- struct domain *d = vcpu->domain;
- int rc = 0;
-
- if ( unlikely(!is_guest_l3_slot(pgentry_ptr_to_slot(pl3e))) )
- {
- gdprintk(XENLOG_WARNING, "L3 update in Xen-private area, slot %#lx\n",
- pgentry_ptr_to_slot(pl3e));
- return -EINVAL;
- }
-
- /*
- * Disallow updates to final L3 slot. It contains Xen mappings, and it
- * would be a pain to ensure they remain continuously valid throughout.
- */
- if ( is_pv_32bit_domain(d) && (pgentry_ptr_to_slot(pl3e) >= 3) )
- return -EINVAL;
-
- if ( unlikely(__copy_from_user(&ol3e, pl3e, sizeof(ol3e)) != 0) )
- return -EFAULT;
-
- if ( l3e_get_flags(nl3e) & _PAGE_PRESENT )
- {
- if ( unlikely(l3e_get_flags(nl3e) & l3_disallow_mask(d)) )
- {
- gdprintk(XENLOG_WARNING, "Bad L3 flags %x\n",
- l3e_get_flags(nl3e) & l3_disallow_mask(d));
- return -EINVAL;
- }
-
- /* Fast path for sufficiently-similar mappings. */
- if ( !l3e_has_changed(ol3e, nl3e, ~FASTPATH_FLAG_WHITELIST) )
- {
- adjust_guest_l3e(nl3e, d);
- rc = UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, vcpu, preserve_ad);
- return rc ? 0 : -EFAULT;
- }
-
- rc = get_page_from_l3e(nl3e, pfn, d, 0);
- if ( unlikely(rc < 0) )
- return rc;
- rc = 0;
-
- adjust_guest_l3e(nl3e, d);
- if ( unlikely(!UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, vcpu,
- preserve_ad)) )
- {
- ol3e = nl3e;
- rc = -EFAULT;
- }
- }
- else if ( unlikely(!UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, vcpu,
- preserve_ad)) )
- {
- return -EFAULT;
- }
-
- if ( likely(rc == 0) )
- if ( !pv_create_pae_xen_mappings(d, pl3e) )
- BUG();
-
- put_page_from_l3e(ol3e, pfn, 0, 1);
- return rc;
-}
-
-/* Update the L4 entry at pl4e to new value nl4e. pl4e is within frame pfn. */
-static int mod_l4_entry(l4_pgentry_t *pl4e,
- l4_pgentry_t nl4e,
- unsigned long pfn,
- int preserve_ad,
- struct vcpu *vcpu)
-{
- struct domain *d = vcpu->domain;
- l4_pgentry_t ol4e;
- int rc = 0;
-
- if ( unlikely(!is_guest_l4_slot(d, pgentry_ptr_to_slot(pl4e))) )
- {
- gdprintk(XENLOG_WARNING, "L4 update in Xen-private area, slot %#lx\n",
- pgentry_ptr_to_slot(pl4e));
- return -EINVAL;
- }
-
- if ( unlikely(__copy_from_user(&ol4e, pl4e, sizeof(ol4e)) != 0) )
- return -EFAULT;
-
- if ( l4e_get_flags(nl4e) & _PAGE_PRESENT )
- {
- if ( unlikely(l4e_get_flags(nl4e) & L4_DISALLOW_MASK) )
- {
- gdprintk(XENLOG_WARNING, "Bad L4 flags %x\n",
- l4e_get_flags(nl4e) & L4_DISALLOW_MASK);
- return -EINVAL;
- }
-
- /* Fast path for sufficiently-similar mappings. */
- if ( !l4e_has_changed(ol4e, nl4e, ~FASTPATH_FLAG_WHITELIST) )
- {
- adjust_guest_l4e(nl4e, d);
- rc = UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn, vcpu, preserve_ad);
- return rc ? 0 : -EFAULT;
- }
-
- rc = get_page_from_l4e(nl4e, pfn, d, 0);
- if ( unlikely(rc < 0) )
- return rc;
- rc = 0;
-
- adjust_guest_l4e(nl4e, d);
- if ( unlikely(!UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn, vcpu,
- preserve_ad)) )
- {
- ol4e = nl4e;
- rc = -EFAULT;
- }
- }
- else if ( unlikely(!UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn, vcpu,
- preserve_ad)) )
- {
- return -EFAULT;
- }
-
- put_page_from_l4e(ol4e, pfn, 0, 1);
- return rc;
-}
-
static int cleanup_page_cacheattr(struct page_info *page)
{
unsigned int cacheattr =
@@ -1890,1123 +1606,96 @@ int vcpu_destroy_pagetables(struct vcpu *v)
return rc != -EINTR ? rc : -ERESTART;
}
-int pv_new_guest_cr3(unsigned long mfn)
+int donate_page(
+ struct domain *d, struct page_info *page, unsigned int memflags)
{
- struct vcpu *curr = current;
- struct domain *currd = curr->domain;
- int rc;
- unsigned long old_base_mfn;
-
- if ( is_pv_32bit_domain(currd) )
- {
- unsigned long gt_mfn = pagetable_get_pfn(curr->arch.guest_table);
- l4_pgentry_t *pl4e = map_domain_page(_mfn(gt_mfn));
-
- rc = mod_l4_entry(pl4e,
- l4e_from_pfn(mfn,
- (_PAGE_PRESENT | _PAGE_RW |
- _PAGE_USER | _PAGE_ACCESSED)),
- gt_mfn, 0, curr);
- unmap_domain_page(pl4e);
- switch ( rc )
- {
- case 0:
- break;
- case -EINTR:
- case -ERESTART:
- return -ERESTART;
- default:
- gdprintk(XENLOG_WARNING,
- "Error while installing new compat baseptr %" PRI_mfn
"\n",
- mfn);
- return rc;
- }
+ const struct domain *owner = dom_xen;
- pv_invalidate_shadow_ldt(curr, false);
- write_ptbase(curr);
+ spin_lock(&d->page_alloc_lock);
- return 0;
- }
+ if ( is_xen_heap_page(page) || ((owner = page_get_owner(page)) != NULL) )
+ goto fail;
- rc = put_old_guest_table(curr);
- if ( unlikely(rc) )
- return rc;
+ if ( d->is_dying )
+ goto fail;
- old_base_mfn = pagetable_get_pfn(curr->arch.guest_table);
- /*
- * This is particularly important when getting restarted after the
- * previous attempt got preempted in the put-old-MFN phase.
- */
- if ( old_base_mfn == mfn )
- {
- write_ptbase(curr);
- return 0;
- }
+ if ( page->count_info & ~(PGC_allocated | 1) )
+ goto fail;
- rc = paging_mode_refcounts(currd)
- ? (get_page_from_mfn(_mfn(mfn), currd) ? 0 : -EINVAL)
- : get_page_and_type_from_mfn(_mfn(mfn), PGT_root_page_table,
- currd, 0, true);
- switch ( rc )
+ if ( !(memflags & MEMF_no_refcount) )
{
- case 0:
- break;
- case -EINTR:
- case -ERESTART:
- return -ERESTART;
- default:
- gdprintk(XENLOG_WARNING,
- "Error while installing new baseptr %" PRI_mfn "\n", mfn);
- return rc;
+ if ( d->tot_pages >= d->max_pages )
+ goto fail;
+ domain_adjust_tot_pages(d, 1);
}
- pv_invalidate_shadow_ldt(curr, false);
-
- if ( !VM_ASSIST(currd, m2p_strict) && !paging_mode_refcounts(currd) )
- fill_ro_mpt(mfn);
- curr->arch.guest_table = pagetable_from_pfn(mfn);
- update_cr3(curr);
-
- write_ptbase(curr);
-
- if ( likely(old_base_mfn != 0) )
- {
- struct page_info *page = mfn_to_page(old_base_mfn);
+ page->count_info = PGC_allocated | 1;
+ page_set_owner(page, d);
+ page_list_add_tail(page,&d->page_list);
- if ( paging_mode_refcounts(currd) )
- put_page(page);
- else
- switch ( rc = put_page_and_type_preemptible(page) )
- {
- case -EINTR:
- rc = -ERESTART;
- /* fallthrough */
- case -ERESTART:
- curr->arch.old_guest_table = page;
- break;
- default:
- BUG_ON(rc);
- break;
- }
- }
+ spin_unlock(&d->page_alloc_lock);
+ return 0;
- return rc;
+ fail:
+ spin_unlock(&d->page_alloc_lock);
+ gdprintk(XENLOG_WARNING, "Bad donate mfn %" PRI_mfn
+ " to d%d (owner d%d) caf=%08lx taf=%" PRtype_info "\n",
+ page_to_mfn(page), d->domain_id,
+ owner ? owner->domain_id : DOMID_INVALID,
+ page->count_info, page->u.inuse.type_info);
+ return -EINVAL;
}
-static struct domain *get_pg_owner(domid_t domid)
+int steal_page(
+ struct domain *d, struct page_info *page, unsigned int memflags)
{
- struct domain *pg_owner = NULL, *curr = current->domain;
+ unsigned long x, y;
+ bool drop_dom_ref = false;
+ const struct domain *owner = dom_xen;
- if ( likely(domid == DOMID_SELF) )
- {
- pg_owner = rcu_lock_current_domain();
- goto out;
- }
+ if ( paging_mode_external(d) )
+ return -EOPNOTSUPP;
- if ( unlikely(domid == curr->domain_id) )
- {
- gdprintk(XENLOG_WARNING, "Cannot specify itself as foreign domain\n");
- goto out;
- }
+ spin_lock(&d->page_alloc_lock);
- switch ( domid )
- {
- case DOMID_IO:
- pg_owner = rcu_lock_domain(dom_io);
- break;
- case DOMID_XEN:
- pg_owner = rcu_lock_domain(dom_xen);
- break;
- default:
- if ( (pg_owner = rcu_lock_domain_by_id(domid)) == NULL )
- {
- gdprintk(XENLOG_WARNING, "Unknown domain d%d\n", domid);
- break;
- }
- break;
- }
+ if ( is_xen_heap_page(page) || ((owner = page_get_owner(page)) != d) )
+ goto fail;
- out:
- return pg_owner;
-}
+ /*
+ * We require there is just one reference (PGC_allocated). We temporarily
+ * drop this reference now so that we can safely swizzle the owner.
+ */
+ y = page->count_info;
+ do {
+ x = y;
+ if ( (x & (PGC_count_mask|PGC_allocated)) != (1 | PGC_allocated) )
+ goto fail;
+ y = cmpxchg(&page->count_info, x, x & ~PGC_count_mask);
+ } while ( y != x );
-static void put_pg_owner(struct domain *pg_owner)
-{
- rcu_unlock_domain(pg_owner);
-}
+ /*
+ * With the sole reference dropped temporarily, no-one can update type
+ * information. Type count also needs to be zero in this case, but e.g.
+ * PGT_seg_desc_page may still have PGT_validated set, which we need to
+ * clear before transferring ownership (as validation criteria vary
+ * depending on domain type).
+ */
+ BUG_ON(page->u.inuse.type_info & (PGT_count_mask | PGT_locked |
+ PGT_pinned));
+ page->u.inuse.type_info = 0;
-static inline int vcpumask_to_pcpumask(
- struct domain *d, XEN_GUEST_HANDLE_PARAM(const_void) bmap, cpumask_t
*pmask)
-{
- unsigned int vcpu_id, vcpu_bias, offs;
- unsigned long vmask;
- struct vcpu *v;
- bool is_native = !is_pv_32bit_domain(d);
+ /* Swizzle the owner then reinstate the PGC_allocated reference. */
+ page_set_owner(page, NULL);
+ y = page->count_info;
+ do {
+ x = y;
+ BUG_ON((x & (PGC_count_mask|PGC_allocated)) != PGC_allocated);
+ } while ( (y = cmpxchg(&page->count_info, x, x | 1)) != x );
- cpumask_clear(pmask);
- for ( vmask = 0, offs = 0; ; ++offs )
- {
- vcpu_bias = offs * (is_native ? BITS_PER_LONG : 32);
- if ( vcpu_bias >= d->max_vcpus )
- return 0;
-
- if ( unlikely(is_native ?
- copy_from_guest_offset(&vmask, bmap, offs, 1) :
- copy_from_guest_offset((unsigned int *)&vmask, bmap,
- offs, 1)) )
- {
- cpumask_clear(pmask);
- return -EFAULT;
- }
-
- while ( vmask )
- {
- vcpu_id = find_first_set_bit(vmask);
- vmask &= ~(1UL << vcpu_id);
- vcpu_id += vcpu_bias;
- if ( (vcpu_id >= d->max_vcpus) )
- return 0;
- if ( ((v = d->vcpu[vcpu_id]) != NULL) )
- cpumask_or(pmask, pmask, v->vcpu_dirty_cpumask);
- }
- }
-}
-
-long do_mmuext_op(
- XEN_GUEST_HANDLE_PARAM(mmuext_op_t) uops,
- unsigned int count,
- XEN_GUEST_HANDLE_PARAM(uint) pdone,
- unsigned int foreigndom)
-{
- struct mmuext_op op;
- unsigned long type;
- unsigned int i, done = 0;
- struct vcpu *curr = current;
- struct domain *currd = curr->domain;
- struct domain *pg_owner;
- int rc = put_old_guest_table(curr);
-
- if ( unlikely(rc) )
- {
- if ( likely(rc == -ERESTART) )
- rc = hypercall_create_continuation(
- __HYPERVISOR_mmuext_op, "hihi", uops, count, pdone,
- foreigndom);
- return rc;
- }
-
- if ( unlikely(count == MMU_UPDATE_PREEMPTED) &&
- likely(guest_handle_is_null(uops)) )
- {
- /*
- * See the curr->arch.old_guest_table related
- * hypercall_create_continuation() below.
- */
- return (int)foreigndom;
- }
-
- if ( unlikely(count & MMU_UPDATE_PREEMPTED) )
- {
- count &= ~MMU_UPDATE_PREEMPTED;
- if ( unlikely(!guest_handle_is_null(pdone)) )
- (void)copy_from_guest(&done, pdone, 1);
- }
- else
- perfc_incr(calls_to_mmuext_op);
-
- if ( unlikely(!guest_handle_okay(uops, count)) )
- return -EFAULT;
-
- if ( (pg_owner = get_pg_owner(foreigndom)) == NULL )
- return -ESRCH;
-
- if ( !is_pv_domain(pg_owner) )
- {
- put_pg_owner(pg_owner);
- return -EINVAL;
- }
-
- rc = xsm_mmuext_op(XSM_TARGET, currd, pg_owner);
- if ( rc )
- {
- put_pg_owner(pg_owner);
- return rc;
- }
-
- for ( i = 0; i < count; i++ )
- {
- if ( curr->arch.old_guest_table || (i && hypercall_preempt_check()) )
- {
- rc = -ERESTART;
- break;
- }
-
- if ( unlikely(__copy_from_guest(&op, uops, 1) != 0) )
- {
- rc = -EFAULT;
- break;
- }
-
- if ( is_hvm_domain(currd) )
- {
- switch ( op.cmd )
- {
- case MMUEXT_PIN_L1_TABLE:
- case MMUEXT_PIN_L2_TABLE:
- case MMUEXT_PIN_L3_TABLE:
- case MMUEXT_PIN_L4_TABLE:
- case MMUEXT_UNPIN_TABLE:
- break;
- default:
- rc = -EOPNOTSUPP;
- goto done;
- }
- }
-
- rc = 0;
-
- switch ( op.cmd )
- {
- struct page_info *page;
- p2m_type_t p2mt;
-
- case MMUEXT_PIN_L1_TABLE:
- type = PGT_l1_page_table;
- goto pin_page;
-
- case MMUEXT_PIN_L2_TABLE:
- type = PGT_l2_page_table;
- goto pin_page;
-
- case MMUEXT_PIN_L3_TABLE:
- type = PGT_l3_page_table;
- goto pin_page;
-
- case MMUEXT_PIN_L4_TABLE:
- if ( is_pv_32bit_domain(pg_owner) )
- break;
- type = PGT_l4_page_table;
-
- pin_page:
- /* Ignore pinning of invalid paging levels. */
- if ( (op.cmd - MMUEXT_PIN_L1_TABLE) > (CONFIG_PAGING_LEVELS - 1) )
- break;
-
- if ( paging_mode_refcounts(pg_owner) )
- break;
-
- page = get_page_from_gfn(pg_owner, op.arg1.mfn, NULL, P2M_ALLOC);
- if ( unlikely(!page) )
- {
- rc = -EINVAL;
- break;
- }
-
- rc = get_page_type_preemptible(page, type);
- if ( unlikely(rc) )
- {
- if ( rc == -EINTR )
- rc = -ERESTART;
- else if ( rc != -ERESTART )
- gdprintk(XENLOG_WARNING,
- "Error %d while pinning mfn %" PRI_mfn "\n",
- rc, page_to_mfn(page));
- if ( page != curr->arch.old_guest_table )
- put_page(page);
- break;
- }
-
- rc = xsm_memory_pin_page(XSM_HOOK, currd, pg_owner, page);
- if ( !rc && unlikely(test_and_set_bit(_PGT_pinned,
- &page->u.inuse.type_info)) )
- {
- gdprintk(XENLOG_WARNING,
- "mfn %" PRI_mfn " already pinned\n",
page_to_mfn(page));
- rc = -EINVAL;
- }
-
- if ( unlikely(rc) )
- goto pin_drop;
-
- /* A page is dirtied when its pin status is set. */
- paging_mark_dirty(pg_owner, _mfn(page_to_mfn(page)));
-
- /* We can race domain destruction (domain_relinquish_resources). */
- if ( unlikely(pg_owner != currd) )
- {
- bool drop_ref;
-
- spin_lock(&pg_owner->page_alloc_lock);
- drop_ref = (pg_owner->is_dying &&
- test_and_clear_bit(_PGT_pinned,
- &page->u.inuse.type_info));
- spin_unlock(&pg_owner->page_alloc_lock);
- if ( drop_ref )
- {
- pin_drop:
- if ( type == PGT_l1_page_table )
- put_page_and_type(page);
- else
- curr->arch.old_guest_table = page;
- }
- }
- break;
-
- case MMUEXT_UNPIN_TABLE:
- if ( paging_mode_refcounts(pg_owner) )
- break;
-
- page = get_page_from_gfn(pg_owner, op.arg1.mfn, NULL, P2M_ALLOC);
- if ( unlikely(!page) )
- {
- gdprintk(XENLOG_WARNING,
- "mfn %" PRI_mfn " bad, or bad owner d%d\n",
- op.arg1.mfn, pg_owner->domain_id);
- rc = -EINVAL;
- break;
- }
-
- if ( !test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
- {
- put_page(page);
- gdprintk(XENLOG_WARNING,
- "mfn %" PRI_mfn " not pinned\n", op.arg1.mfn);
- rc = -EINVAL;
- break;
- }
-
- switch ( rc = put_page_and_type_preemptible(page) )
- {
- case -EINTR:
- case -ERESTART:
- curr->arch.old_guest_table = page;
- rc = 0;
- break;
- default:
- BUG_ON(rc);
- break;
- }
- put_page(page);
-
- /* A page is dirtied when its pin status is cleared. */
- paging_mark_dirty(pg_owner, _mfn(page_to_mfn(page)));
- break;
-
- case MMUEXT_NEW_BASEPTR:
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( unlikely(paging_mode_translate(currd)) )
- rc = -EINVAL;
- else
- rc = pv_new_guest_cr3(op.arg1.mfn);
- break;
-
- case MMUEXT_NEW_USER_BASEPTR: {
- unsigned long old_mfn;
-
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( unlikely(paging_mode_translate(currd)) )
- rc = -EINVAL;
- if ( unlikely(rc) )
- break;
-
- old_mfn = pagetable_get_pfn(curr->arch.guest_table_user);
- /*
- * This is particularly important when getting restarted after the
- * previous attempt got preempted in the put-old-MFN phase.
- */
- if ( old_mfn == op.arg1.mfn )
- break;
-
- if ( op.arg1.mfn != 0 )
- {
- rc = get_page_and_type_from_mfn(
- _mfn(op.arg1.mfn), PGT_root_page_table, currd, 0, true);
-
- if ( unlikely(rc) )
- {
- if ( rc == -EINTR )
- rc = -ERESTART;
- else if ( rc != -ERESTART )
- gdprintk(XENLOG_WARNING,
- "Error %d installing new mfn %" PRI_mfn "\n",
- rc, op.arg1.mfn);
- break;
- }
-
- if ( VM_ASSIST(currd, m2p_strict) )
- zap_ro_mpt(op.arg1.mfn);
- }
-
- curr->arch.guest_table_user = pagetable_from_pfn(op.arg1.mfn);
-
- if ( old_mfn != 0 )
- {
- page = mfn_to_page(old_mfn);
-
- switch ( rc = put_page_and_type_preemptible(page) )
- {
- case -EINTR:
- rc = -ERESTART;
- /* fallthrough */
- case -ERESTART:
- curr->arch.old_guest_table = page;
- break;
- default:
- BUG_ON(rc);
- break;
- }
- }
-
- break;
- }
-
- case MMUEXT_TLB_FLUSH_LOCAL:
- if ( likely(currd == pg_owner) )
- flush_tlb_local();
- else
- rc = -EPERM;
- break;
-
- case MMUEXT_INVLPG_LOCAL:
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else
- paging_invlpg(curr, op.arg1.linear_addr);
- break;
-
- case MMUEXT_TLB_FLUSH_MULTI:
- case MMUEXT_INVLPG_MULTI:
- {
- cpumask_t *mask = this_cpu(scratch_cpumask);
-
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( unlikely(vcpumask_to_pcpumask(currd,
- guest_handle_to_param(op.arg2.vcpumask,
- const_void),
- mask)) )
- rc = -EINVAL;
- if ( unlikely(rc) )
- break;
-
- if ( op.cmd == MMUEXT_TLB_FLUSH_MULTI )
- flush_tlb_mask(mask);
- else if ( __addr_ok(op.arg1.linear_addr) )
- flush_tlb_one_mask(mask, op.arg1.linear_addr);
- break;
- }
-
- case MMUEXT_TLB_FLUSH_ALL:
- if ( likely(currd == pg_owner) )
- flush_tlb_mask(currd->domain_dirty_cpumask);
- else
- rc = -EPERM;
- break;
-
- case MMUEXT_INVLPG_ALL:
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( __addr_ok(op.arg1.linear_addr) )
- flush_tlb_one_mask(currd->domain_dirty_cpumask,
- op.arg1.linear_addr);
- break;
-
- case MMUEXT_FLUSH_CACHE:
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( unlikely(!cache_flush_permitted(currd)) )
- rc = -EACCES;
- else
- wbinvd();
- break;
-
- case MMUEXT_FLUSH_CACHE_GLOBAL:
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( likely(cache_flush_permitted(currd)) )
- {
- unsigned int cpu;
- cpumask_t *mask = this_cpu(scratch_cpumask);
-
- cpumask_clear(mask);
- for_each_online_cpu(cpu)
- if ( !cpumask_intersects(mask,
- per_cpu(cpu_sibling_mask, cpu)) )
- __cpumask_set_cpu(cpu, mask);
- flush_mask(mask, FLUSH_CACHE);
- }
- else
- rc = -EINVAL;
- break;
-
- case MMUEXT_SET_LDT:
- {
- unsigned int ents = op.arg2.nr_ents;
- unsigned long ptr = ents ? op.arg1.linear_addr : 0;
-
- if ( unlikely(currd != pg_owner) )
- rc = -EPERM;
- else if ( paging_mode_external(currd) )
- rc = -EINVAL;
- else if ( ((ptr & (PAGE_SIZE - 1)) != 0) || !__addr_ok(ptr) ||
- (ents > 8192) )
- {
- gdprintk(XENLOG_WARNING,
- "Bad args to SET_LDT: ptr=%lx, ents=%x\n", ptr, ents);
- rc = -EINVAL;
- }
- else if ( (curr->arch.pv_vcpu.ldt_ents != ents) ||
- (curr->arch.pv_vcpu.ldt_base != ptr) )
- {
- pv_invalidate_shadow_ldt(curr, false);
- flush_tlb_local();
- curr->arch.pv_vcpu.ldt_base = ptr;
- curr->arch.pv_vcpu.ldt_ents = ents;
- load_LDT(curr);
- }
- break;
- }
-
- case MMUEXT_CLEAR_PAGE:
- page = get_page_from_gfn(pg_owner, op.arg1.mfn, &p2mt, P2M_ALLOC);
- if ( unlikely(p2mt != p2m_ram_rw) && page )
- {
- put_page(page);
- page = NULL;
- }
- if ( !page || !get_page_type(page, PGT_writable_page) )
- {
- if ( page )
- put_page(page);
- gdprintk(XENLOG_WARNING,
- "Error clearing mfn %" PRI_mfn "\n", op.arg1.mfn);
- rc = -EINVAL;
- break;
- }
-
- /* A page is dirtied when it's being cleared. */
- paging_mark_dirty(pg_owner, _mfn(page_to_mfn(page)));
-
- clear_domain_page(_mfn(page_to_mfn(page)));
-
- put_page_and_type(page);
- break;
-
- case MMUEXT_COPY_PAGE:
- {
- struct page_info *src_page, *dst_page;
-
- src_page = get_page_from_gfn(pg_owner, op.arg2.src_mfn, &p2mt,
- P2M_ALLOC);
- if ( unlikely(p2mt != p2m_ram_rw) && src_page )
- {
- put_page(src_page);
- src_page = NULL;
- }
- if ( unlikely(!src_page) )
- {
- gdprintk(XENLOG_WARNING,
- "Error copying from mfn %" PRI_mfn "\n",
- op.arg2.src_mfn);
- rc = -EINVAL;
- break;
- }
-
- dst_page = get_page_from_gfn(pg_owner, op.arg1.mfn, &p2mt,
- P2M_ALLOC);
- if ( unlikely(p2mt != p2m_ram_rw) && dst_page )
- {
- put_page(dst_page);
- dst_page = NULL;
- }
- rc = (dst_page &&
- get_page_type(dst_page, PGT_writable_page)) ? 0 : -EINVAL;
- if ( unlikely(rc) )
- {
- put_page(src_page);
- if ( dst_page )
- put_page(dst_page);
- gdprintk(XENLOG_WARNING,
- "Error copying to mfn %" PRI_mfn "\n", op.arg1.mfn);
- break;
- }
-
- /* A page is dirtied when it's being copied to. */
- paging_mark_dirty(pg_owner, _mfn(page_to_mfn(dst_page)));
-
- copy_domain_page(_mfn(page_to_mfn(dst_page)),
- _mfn(page_to_mfn(src_page)));
-
- put_page_and_type(dst_page);
- put_page(src_page);
- break;
- }
-
- case MMUEXT_MARK_SUPER:
- case MMUEXT_UNMARK_SUPER:
- rc = -EOPNOTSUPP;
- break;
-
- default:
- rc = -ENOSYS;
- break;
- }
-
- done:
- if ( unlikely(rc) )
- break;
-
- guest_handle_add_offset(uops, 1);
- }
-
- if ( rc == -ERESTART )
- {
- ASSERT(i < count);
- rc = hypercall_create_continuation(
- __HYPERVISOR_mmuext_op, "hihi",
- uops, (count - i) | MMU_UPDATE_PREEMPTED, pdone, foreigndom);
- }
- else if ( curr->arch.old_guest_table )
- {
- XEN_GUEST_HANDLE_PARAM(void) null;
-
- ASSERT(rc || i == count);
- set_xen_guest_handle(null, NULL);
- /*
- * In order to have a way to communicate the final return value to
- * our continuation, we pass this in place of "foreigndom", building
- * on the fact that this argument isn't needed anymore.
- */
- rc = hypercall_create_continuation(
- __HYPERVISOR_mmuext_op, "hihi", null,
- MMU_UPDATE_PREEMPTED, null, rc);
- }
-
- put_pg_owner(pg_owner);
-
- perfc_add(num_mmuext_ops, i);
-
- /* Add incremental work we have done to the @done output parameter. */
- if ( unlikely(!guest_handle_is_null(pdone)) )
- {
- done += i;
- copy_to_guest(pdone, &done, 1);
- }
-
- return rc;
-}
-
-long do_mmu_update(
- XEN_GUEST_HANDLE_PARAM(mmu_update_t) ureqs,
- unsigned int count,
- XEN_GUEST_HANDLE_PARAM(uint) pdone,
- unsigned int foreigndom)
-{
- struct mmu_update req;
- void *va;
- unsigned long gpfn, gmfn, mfn;
- struct page_info *page;
- unsigned int cmd, i = 0, done = 0, pt_dom;
- struct vcpu *curr = current, *v = curr;
- struct domain *d = v->domain, *pt_owner = d, *pg_owner;
- struct domain_mmap_cache mapcache;
- uint32_t xsm_needed = 0;
- uint32_t xsm_checked = 0;
- int rc = put_old_guest_table(curr);
-
- if ( unlikely(rc) )
- {
- if ( likely(rc == -ERESTART) )
- rc = hypercall_create_continuation(
- __HYPERVISOR_mmu_update, "hihi", ureqs, count, pdone,
- foreigndom);
- return rc;
- }
-
- if ( unlikely(count == MMU_UPDATE_PREEMPTED) &&
- likely(guest_handle_is_null(ureqs)) )
- {
- /*
- * See the curr->arch.old_guest_table related
- * hypercall_create_continuation() below.
- */
- return (int)foreigndom;
- }
-
- if ( unlikely(count & MMU_UPDATE_PREEMPTED) )
- {
- count &= ~MMU_UPDATE_PREEMPTED;
- if ( unlikely(!guest_handle_is_null(pdone)) )
- (void)copy_from_guest(&done, pdone, 1);
- }
- else
- perfc_incr(calls_to_mmu_update);
-
- if ( unlikely(!guest_handle_okay(ureqs, count)) )
- return -EFAULT;
-
- if ( (pt_dom = foreigndom >> 16) != 0 )
- {
- /* Pagetables belong to a foreign domain (PFD). */
- if ( (pt_owner = rcu_lock_domain_by_id(pt_dom - 1)) == NULL )
- return -ESRCH;
-
- if ( pt_owner == d )
- rcu_unlock_domain(pt_owner);
- else if ( !pt_owner->vcpu || (v = pt_owner->vcpu[0]) == NULL )
- {
- rc = -EINVAL;
- goto out;
- }
- }
-
- if ( (pg_owner = get_pg_owner((uint16_t)foreigndom)) == NULL )
- {
- rc = -ESRCH;
- goto out;
- }
-
- domain_mmap_cache_init(&mapcache);
-
- for ( i = 0; i < count; i++ )
- {
- if ( curr->arch.old_guest_table || (i && hypercall_preempt_check()) )
- {
- rc = -ERESTART;
- break;
- }
-
- if ( unlikely(__copy_from_guest(&req, ureqs, 1) != 0) )
- {
- rc = -EFAULT;
- break;
- }
-
- cmd = req.ptr & (sizeof(l1_pgentry_t)-1);
-
- switch ( cmd )
- {
- /*
- * MMU_NORMAL_PT_UPDATE: Normal update to any level of page table.
- * MMU_UPDATE_PT_PRESERVE_AD: As above but also preserve (OR)
- * current A/D bits.
- */
- case MMU_NORMAL_PT_UPDATE:
- case MMU_PT_UPDATE_PRESERVE_AD:
- {
- p2m_type_t p2mt;
-
- rc = -EOPNOTSUPP;
- if ( unlikely(paging_mode_refcounts(pt_owner)) )
- break;
-
- xsm_needed |= XSM_MMU_NORMAL_UPDATE;
- if ( get_pte_flags(req.val) & _PAGE_PRESENT )
- {
- xsm_needed |= XSM_MMU_UPDATE_READ;
- if ( get_pte_flags(req.val) & _PAGE_RW )
- xsm_needed |= XSM_MMU_UPDATE_WRITE;
- }
- if ( xsm_needed != xsm_checked )
- {
- rc = xsm_mmu_update(XSM_TARGET, d, pt_owner, pg_owner,
xsm_needed);
- if ( rc )
- break;
- xsm_checked = xsm_needed;
- }
- rc = -EINVAL;
-
- req.ptr -= cmd;
- gmfn = req.ptr >> PAGE_SHIFT;
- page = get_page_from_gfn(pt_owner, gmfn, &p2mt, P2M_ALLOC);
-
- if ( p2m_is_paged(p2mt) )
- {
- ASSERT(!page);
- p2m_mem_paging_populate(pg_owner, gmfn);
- rc = -ENOENT;
- break;
- }
-
- if ( unlikely(!page) )
- {
- gdprintk(XENLOG_WARNING,
- "Could not get page for normal update\n");
- break;
- }
-
- mfn = page_to_mfn(page);
- va = map_domain_page_with_cache(mfn, &mapcache);
- va = (void *)((unsigned long)va +
- (unsigned long)(req.ptr & ~PAGE_MASK));
-
- if ( page_lock(page) )
- {
- switch ( page->u.inuse.type_info & PGT_type_mask )
- {
- case PGT_l1_page_table:
- {
- l1_pgentry_t l1e = l1e_from_intpte(req.val);
- p2m_type_t l1e_p2mt = p2m_ram_rw;
- struct page_info *target = NULL;
- p2m_query_t q = (l1e_get_flags(l1e) & _PAGE_RW) ?
- P2M_UNSHARE : P2M_ALLOC;
-
- if ( paging_mode_translate(pg_owner) )
- target = get_page_from_gfn(pg_owner, l1e_get_pfn(l1e),
- &l1e_p2mt, q);
-
- if ( p2m_is_paged(l1e_p2mt) )
- {
- if ( target )
- put_page(target);
- p2m_mem_paging_populate(pg_owner, l1e_get_pfn(l1e));
- rc = -ENOENT;
- break;
- }
- else if ( p2m_ram_paging_in == l1e_p2mt && !target )
- {
- rc = -ENOENT;
- break;
- }
- /* If we tried to unshare and failed */
- else if ( (q & P2M_UNSHARE) && p2m_is_shared(l1e_p2mt) )
- {
- /* We could not have obtained a page ref. */
- ASSERT(target == NULL);
- /* And mem_sharing_notify has already been called. */
- rc = -ENOMEM;
- break;
- }
-
- rc = mod_l1_entry(va, l1e, mfn,
- cmd == MMU_PT_UPDATE_PRESERVE_AD, v,
- pg_owner);
- if ( target )
- put_page(target);
- }
- break;
- case PGT_l2_page_table:
- rc = mod_l2_entry(va, l2e_from_intpte(req.val), mfn,
- cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
- break;
- case PGT_l3_page_table:
- rc = mod_l3_entry(va, l3e_from_intpte(req.val), mfn,
- cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
- break;
- case PGT_l4_page_table:
- rc = mod_l4_entry(va, l4e_from_intpte(req.val), mfn,
- cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
- break;
- case PGT_writable_page:
- perfc_incr(writable_mmu_updates);
- if ( paging_write_guest_entry(v, va, req.val, _mfn(mfn)) )
- rc = 0;
- break;
- }
- page_unlock(page);
- if ( rc == -EINTR )
- rc = -ERESTART;
- }
- else if ( get_page_type(page, PGT_writable_page) )
- {
- perfc_incr(writable_mmu_updates);
- if ( paging_write_guest_entry(v, va, req.val, _mfn(mfn)) )
- rc = 0;
- put_page_type(page);
- }
-
- unmap_domain_page_with_cache(va, &mapcache);
- put_page(page);
- }
- break;
-
- case MMU_MACHPHYS_UPDATE:
- if ( unlikely(d != pt_owner) )
- {
- rc = -EPERM;
- break;
- }
-
- if ( unlikely(paging_mode_translate(pg_owner)) )
- {
- rc = -EINVAL;
- break;
- }
-
- mfn = req.ptr >> PAGE_SHIFT;
- gpfn = req.val;
-
- xsm_needed |= XSM_MMU_MACHPHYS_UPDATE;
- if ( xsm_needed != xsm_checked )
- {
- rc = xsm_mmu_update(XSM_TARGET, d, NULL, pg_owner, xsm_needed);
- if ( rc )
- break;
- xsm_checked = xsm_needed;
- }
-
- if ( unlikely(!get_page_from_mfn(_mfn(mfn), pg_owner)) )
- {
- gdprintk(XENLOG_WARNING,
- "Could not get page for mach->phys update\n");
- rc = -EINVAL;
- break;
- }
-
- set_gpfn_from_mfn(mfn, gpfn);
-
- paging_mark_dirty(pg_owner, _mfn(mfn));
-
- put_page(mfn_to_page(mfn));
- break;
-
- default:
- rc = -ENOSYS;
- break;
- }
-
- if ( unlikely(rc) )
- break;
-
- guest_handle_add_offset(ureqs, 1);
- }
-
- if ( rc == -ERESTART )
- {
- ASSERT(i < count);
- rc = hypercall_create_continuation(
- __HYPERVISOR_mmu_update, "hihi",
- ureqs, (count - i) | MMU_UPDATE_PREEMPTED, pdone, foreigndom);
- }
- else if ( curr->arch.old_guest_table )
- {
- XEN_GUEST_HANDLE_PARAM(void) null;
-
- ASSERT(rc || i == count);
- set_xen_guest_handle(null, NULL);
- /*
- * In order to have a way to communicate the final return value to
- * our continuation, we pass this in place of "foreigndom", building
- * on the fact that this argument isn't needed anymore.
- */
- rc = hypercall_create_continuation(
- __HYPERVISOR_mmu_update, "hihi", null,
- MMU_UPDATE_PREEMPTED, null, rc);
- }
-
- put_pg_owner(pg_owner);
-
- domain_mmap_cache_destroy(&mapcache);
-
- perfc_add(num_page_updates, i);
-
- out:
- if ( pt_owner != d )
- rcu_unlock_domain(pt_owner);
-
- /* Add incremental work we have done to the @done output parameter. */
- if ( unlikely(!guest_handle_is_null(pdone)) )
- {
- done += i;
- copy_to_guest(pdone, &done, 1);
- }
-
- return rc;
-}
-
-int donate_page(
- struct domain *d, struct page_info *page, unsigned int memflags)
-{
- const struct domain *owner = dom_xen;
-
- spin_lock(&d->page_alloc_lock);
-
- if ( is_xen_heap_page(page) || ((owner = page_get_owner(page)) != NULL) )
- goto fail;
-
- if ( d->is_dying )
- goto fail;
-
- if ( page->count_info & ~(PGC_allocated | 1) )
- goto fail;
-
- if ( !(memflags & MEMF_no_refcount) )
- {
- if ( d->tot_pages >= d->max_pages )
- goto fail;
- domain_adjust_tot_pages(d, 1);
- }
-
- page->count_info = PGC_allocated | 1;
- page_set_owner(page, d);
- page_list_add_tail(page,&d->page_list);
-
- spin_unlock(&d->page_alloc_lock);
- return 0;
-
- fail:
- spin_unlock(&d->page_alloc_lock);
- gdprintk(XENLOG_WARNING, "Bad donate mfn %" PRI_mfn
- " to d%d (owner d%d) caf=%08lx taf=%" PRtype_info "\n",
- page_to_mfn(page), d->domain_id,
- owner ? owner->domain_id : DOMID_INVALID,
- page->count_info, page->u.inuse.type_info);
- return -EINVAL;
-}
-
-int steal_page(
- struct domain *d, struct page_info *page, unsigned int memflags)
-{
- unsigned long x, y;
- bool drop_dom_ref = false;
- const struct domain *owner = dom_xen;
-
- if ( paging_mode_external(d) )
- return -EOPNOTSUPP;
-
- spin_lock(&d->page_alloc_lock);
-
- if ( is_xen_heap_page(page) || ((owner = page_get_owner(page)) != d) )
- goto fail;
-
- /*
- * We require there is just one reference (PGC_allocated). We temporarily
- * drop this reference now so that we can safely swizzle the owner.
- */
- y = page->count_info;
- do {
- x = y;
- if ( (x & (PGC_count_mask|PGC_allocated)) != (1 | PGC_allocated) )
- goto fail;
- y = cmpxchg(&page->count_info, x, x & ~PGC_count_mask);
- } while ( y != x );
-
- /*
- * With the sole reference dropped temporarily, no-one can update type
- * information. Type count also needs to be zero in this case, but e.g.
- * PGT_seg_desc_page may still have PGT_validated set, which we need to
- * clear before transferring ownership (as validation criteria vary
- * depending on domain type).
- */
- BUG_ON(page->u.inuse.type_info & (PGT_count_mask | PGT_locked |
- PGT_pinned));
- page->u.inuse.type_info = 0;
-
- /* Swizzle the owner then reinstate the PGC_allocated reference. */
- page_set_owner(page, NULL);
- y = page->count_info;
- do {
- x = y;
- BUG_ON((x & (PGC_count_mask|PGC_allocated)) != PGC_allocated);
- } while ( (y = cmpxchg(&page->count_info, x, x | 1)) != x );
-
- /* Unlink from original owner. */
- if ( !(memflags & MEMF_no_refcount) && !domain_adjust_tot_pages(d, -1) )
- drop_dom_ref = true;
- page_list_del(page, &d->page_list);
+ /* Unlink from original owner. */
+ if ( !(memflags & MEMF_no_refcount) && !domain_adjust_tot_pages(d, -1) )
+ drop_dom_ref = true;
+ page_list_del(page, &d->page_list);
spin_unlock(&d->page_alloc_lock);
if ( unlikely(drop_dom_ref) )
@@ -3023,122 +1712,6 @@ int steal_page(
return -EINVAL;
}
-static int __do_update_va_mapping(
- unsigned long va, u64 val64, unsigned long flags, struct domain *pg_owner)
-{
- l1_pgentry_t val = l1e_from_intpte(val64);
- struct vcpu *v = current;
- struct domain *d = v->domain;
- struct page_info *gl1pg;
- l1_pgentry_t *pl1e;
- unsigned long bmap_ptr, gl1mfn;
- cpumask_t *mask = NULL;
- int rc;
-
- perfc_incr(calls_to_update_va);
-
- rc = xsm_update_va_mapping(XSM_TARGET, d, pg_owner, val);
- if ( rc )
- return rc;
-
- rc = -EINVAL;
- pl1e = pv_map_guest_l1e(va, &gl1mfn);
- if ( unlikely(!pl1e || !get_page_from_mfn(_mfn(gl1mfn), d)) )
- goto out;
-
- gl1pg = mfn_to_page(gl1mfn);
- if ( !page_lock(gl1pg) )
- {
- put_page(gl1pg);
- goto out;
- }
-
- if ( (gl1pg->u.inuse.type_info & PGT_type_mask) != PGT_l1_page_table )
- {
- page_unlock(gl1pg);
- put_page(gl1pg);
- goto out;
- }
-
- rc = mod_l1_entry(pl1e, val, gl1mfn, 0, v, pg_owner);
-
- page_unlock(gl1pg);
- put_page(gl1pg);
-
- out:
- if ( pl1e )
- pv_unmap_guest_l1e(pl1e);
-
- switch ( flags & UVMF_FLUSHTYPE_MASK )
- {
- case UVMF_TLB_FLUSH:
- switch ( (bmap_ptr = flags & ~UVMF_FLUSHTYPE_MASK) )
- {
- case UVMF_LOCAL:
- flush_tlb_local();
- break;
- case UVMF_ALL:
- mask = d->domain_dirty_cpumask;
- break;
- default:
- mask = this_cpu(scratch_cpumask);
- rc = vcpumask_to_pcpumask(d, const_guest_handle_from_ptr(bmap_ptr,
- void),
- mask);
- break;
- }
- if ( mask )
- flush_tlb_mask(mask);
- break;
-
- case UVMF_INVLPG:
- switch ( (bmap_ptr = flags & ~UVMF_FLUSHTYPE_MASK) )
- {
- case UVMF_LOCAL:
- paging_invlpg(v, va);
- break;
- case UVMF_ALL:
- mask = d->domain_dirty_cpumask;
- break;
- default:
- mask = this_cpu(scratch_cpumask);
- rc = vcpumask_to_pcpumask(d, const_guest_handle_from_ptr(bmap_ptr,
- void),
- mask);
- break;
- }
- if ( mask )
- flush_tlb_one_mask(mask, va);
- break;
- }
-
- return rc;
-}
-
-long do_update_va_mapping(unsigned long va, u64 val64,
- unsigned long flags)
-{
- return __do_update_va_mapping(va, val64, flags, current->domain);
-}
-
-long do_update_va_mapping_otherdomain(unsigned long va, u64 val64,
- unsigned long flags,
- domid_t domid)
-{
- struct domain *pg_owner;
- int rc;
-
- if ( (pg_owner = get_pg_owner(domid)) == NULL )
- return -ESRCH;
-
- rc = __do_update_va_mapping(va, val64, flags, pg_owner);
-
- put_pg_owner(pg_owner);
-
- return rc;
-}
-
-
typedef struct e820entry e820entry_t;
DEFINE_XEN_GUEST_HANDLE(e820entry_t);
diff --git a/xen/arch/x86/pv/Makefile b/xen/arch/x86/pv/Makefile
index 42e9d3723b..219d7d0c63 100644
--- a/xen/arch/x86/pv/Makefile
+++ b/xen/arch/x86/pv/Makefile
@@ -12,6 +12,7 @@ obj-y += hypercall.o
obj-y += iret.o
obj-y += misc-hypercalls.o
obj-y += mm.o
+obj-y += mm-hypercalls.o
obj-y += traps.o
obj-bin-y += dom0_build.init.o
diff --git a/xen/arch/x86/pv/mm-hypercalls.c b/xen/arch/x86/pv/mm-hypercalls.c
new file mode 100644
index 0000000000..8e48df89b5
--- /dev/null
+++ b/xen/arch/x86/pv/mm-hypercalls.c
@@ -0,0 +1,1461 @@
+/******************************************************************************
+ * arch/x86/pv/mm-hypercalls.c
+ *
+ * Memory management hypercalls for PV guests
+ *
+ * Copyright (c) 2002-2005 K A Fraser
+ * Copyright (c) 2004 Christian Limpach
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/event.h>
+#include <xen/guest_access.h>
+
+#include <asm/hypercall.h>
+#include <asm/iocap.h>
+#include <asm/ldt.h>
+#include <asm/mm.h>
+#include <asm/p2m.h>
+#include <asm/pv/mm.h>
+#include <asm/setup.h>
+
+#include <xsm/xsm.h>
+
+#include "mm.h"
+
+static struct domain *get_pg_owner(domid_t domid)
+{
+ struct domain *pg_owner = NULL, *currd = current->domain;
+
+ if ( likely(domid == DOMID_SELF) )
+ {
+ pg_owner = rcu_lock_current_domain();
+ goto out;
+ }
+
+ if ( unlikely(domid == currd->domain_id) )
+ {
+ gdprintk(XENLOG_WARNING, "Cannot specify itself as foreign domain\n");
+ goto out;
+ }
+
+ switch ( domid )
+ {
+ case DOMID_IO:
+ pg_owner = rcu_lock_domain(dom_io);
+ break;
+ case DOMID_XEN:
+ pg_owner = rcu_lock_domain(dom_xen);
+ break;
+ default:
+ if ( (pg_owner = rcu_lock_domain_by_id(domid)) == NULL )
+ {
+ gdprintk(XENLOG_WARNING, "Unknown domain d%d\n", domid);
+ break;
+ }
+ break;
+ }
+
+ out:
+ return pg_owner;
+}
+
+static void put_pg_owner(struct domain *pg_owner)
+{
+ rcu_unlock_domain(pg_owner);
+}
+
+static inline int vcpumask_to_pcpumask(struct domain *d,
+ XEN_GUEST_HANDLE_PARAM(const_void) bmap, cpumask_t *pmask)
+{
+ unsigned int vcpu_id, vcpu_bias, offs;
+ unsigned long vmask;
+ struct vcpu *v;
+ bool is_native = !is_pv_32bit_domain(d);
+
+ cpumask_clear(pmask);
+ for ( vmask = 0, offs = 0; ; ++offs )
+ {
+ vcpu_bias = offs * (is_native ? BITS_PER_LONG : 32);
+ if ( vcpu_bias >= d->max_vcpus )
+ return 0;
+
+ if ( unlikely(is_native ?
+ copy_from_guest_offset(&vmask, bmap, offs, 1) :
+ copy_from_guest_offset((unsigned int *)&vmask, bmap,
+ offs, 1)) )
+ {
+ cpumask_clear(pmask);
+ return -EFAULT;
+ }
+
+ while ( vmask )
+ {
+ vcpu_id = find_first_set_bit(vmask);
+ vmask &= ~(1UL << vcpu_id);
+ vcpu_id += vcpu_bias;
+ if ( (vcpu_id >= d->max_vcpus) )
+ return 0;
+ if ( ((v = d->vcpu[vcpu_id]) != NULL) )
+ cpumask_or(pmask, pmask, v->vcpu_dirty_cpumask);
+ }
+ }
+}
+
+/*
+ * PTE flags that a guest may change without re-validating the PTE.
+ * All other bits affect translation, caching, or Xen's safety.
+ */
+#define FASTPATH_FLAG_WHITELIST \
+ (_PAGE_NX_BIT | _PAGE_AVAIL_HIGH | _PAGE_AVAIL | _PAGE_GLOBAL | \
+ _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_USER)
+
+/* Update the L1 entry at pl1e to new value nl1e. */
+static int mod_l1_entry(l1_pgentry_t *pl1e, l1_pgentry_t nl1e,
+ unsigned long gl1mfn, int preserve_ad,
+ struct vcpu *pt_vcpu, struct domain *pg_dom)
+{
+ l1_pgentry_t ol1e;
+ struct domain *pt_dom = pt_vcpu->domain;
+ int rc = 0;
+
+ if ( unlikely(__copy_from_user(&ol1e, pl1e, sizeof(ol1e)) != 0) )
+ return -EFAULT;
+
+ ASSERT(!paging_mode_refcounts(pt_dom));
+
+ if ( l1e_get_flags(nl1e) & _PAGE_PRESENT )
+ {
+ /* Translate foreign guest addresses. */
+ struct page_info *page = NULL;
+
+ if ( unlikely(l1e_get_flags(nl1e) & l1_disallow_mask(pt_dom)) )
+ {
+ gdprintk(XENLOG_WARNING, "Bad L1 flags %x\n",
+ l1e_get_flags(nl1e) & l1_disallow_mask(pt_dom));
+ return -EINVAL;
+ }
+
+ if ( paging_mode_translate(pg_dom) )
+ {
+ page = get_page_from_gfn(pg_dom, l1e_get_pfn(nl1e), NULL,
P2M_ALLOC);
+ if ( !page )
+ return -EINVAL;
+ nl1e = l1e_from_pfn(page_to_mfn(page), l1e_get_flags(nl1e));
+ }
+
+ /* Fast path for sufficiently-similar mappings. */
+ if ( !l1e_has_changed(ol1e, nl1e, ~FASTPATH_FLAG_WHITELIST) )
+ {
+ adjust_guest_l1e(nl1e, pt_dom);
+ rc = UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, pt_vcpu,
+ preserve_ad);
+ if ( page )
+ put_page(page);
+ return rc ? 0 : -EBUSY;
+ }
+
+ switch ( rc = get_page_from_l1e(nl1e, pt_dom, pg_dom) )
+ {
+ default:
+ if ( page )
+ put_page(page);
+ return rc;
+ case 0:
+ break;
+ case _PAGE_RW ... _PAGE_RW | PAGE_CACHE_ATTRS:
+ ASSERT(!(rc & ~(_PAGE_RW | PAGE_CACHE_ATTRS)));
+ l1e_flip_flags(nl1e, rc);
+ rc = 0;
+ break;
+ }
+ if ( page )
+ put_page(page);
+
+ adjust_guest_l1e(nl1e, pt_dom);
+ if ( unlikely(!UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, pt_vcpu,
+ preserve_ad)) )
+ {
+ ol1e = nl1e;
+ rc = -EBUSY;
+ }
+ }
+ else if ( unlikely(!UPDATE_ENTRY(l1, pl1e, ol1e, nl1e, gl1mfn, pt_vcpu,
+ preserve_ad)) )
+ {
+ return -EBUSY;
+ }
+
+ put_page_from_l1e(ol1e, pt_dom);
+ return rc;
+}
+
+
+/* Update the L2 entry at pl2e to new value nl2e. pl2e is within frame pfn. */
+static int mod_l2_entry(l2_pgentry_t *pl2e, l2_pgentry_t nl2e,
+ unsigned long pfn, int preserve_ad, struct vcpu *vcpu)
+{
+ l2_pgentry_t ol2e;
+ struct domain *d = vcpu->domain;
+ struct page_info *l2pg = mfn_to_page(pfn);
+ unsigned long type = l2pg->u.inuse.type_info;
+ int rc = 0;
+
+ if ( unlikely(!is_guest_l2_slot(d, type, pgentry_ptr_to_slot(pl2e))) )
+ {
+ gdprintk(XENLOG_WARNING, "L2 update in Xen-private area, slot %#lx\n",
+ pgentry_ptr_to_slot(pl2e));
+ return -EPERM;
+ }
+
+ if ( unlikely(__copy_from_user(&ol2e, pl2e, sizeof(ol2e)) != 0) )
+ return -EFAULT;
+
+ if ( l2e_get_flags(nl2e) & _PAGE_PRESENT )
+ {
+ if ( unlikely(l2e_get_flags(nl2e) & L2_DISALLOW_MASK) )
+ {
+ gdprintk(XENLOG_WARNING, "Bad L2 flags %x\n",
+ l2e_get_flags(nl2e) & L2_DISALLOW_MASK);
+ return -EINVAL;
+ }
+
+ /* Fast path for sufficiently-similar mappings. */
+ if ( !l2e_has_changed(ol2e, nl2e, ~FASTPATH_FLAG_WHITELIST) )
+ {
+ adjust_guest_l2e(nl2e, d);
+ if ( UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu, preserve_ad) )
+ return 0;
+ return -EBUSY;
+ }
+
+ if ( unlikely((rc = get_page_from_l2e(nl2e, pfn, d)) < 0) )
+ return rc;
+
+ adjust_guest_l2e(nl2e, d);
+ if ( unlikely(!UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu,
+ preserve_ad)) )
+ {
+ ol2e = nl2e;
+ rc = -EBUSY;
+ }
+ }
+ else if ( unlikely(!UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, vcpu,
+ preserve_ad)) )
+ {
+ return -EBUSY;
+ }
+
+ put_page_from_l2e(ol2e, pfn);
+ return rc;
+}
+
+/* Update the L3 entry at pl3e to new value nl3e. pl3e is within frame pfn. */
+static int mod_l3_entry(l3_pgentry_t *pl3e, l3_pgentry_t nl3e,
+ unsigned long pfn, int preserve_ad, struct vcpu *vcpu)
+{
+ l3_pgentry_t ol3e;
+ struct domain *d = vcpu->domain;
+ int rc = 0;
+
+ if ( unlikely(!is_guest_l3_slot(pgentry_ptr_to_slot(pl3e))) )
+ {
+ gdprintk(XENLOG_WARNING, "L3 update in Xen-private area, slot %#lx\n",
+ pgentry_ptr_to_slot(pl3e));
+ return -EINVAL;
+ }
+
+ /*
+ * Disallow updates to final L3 slot. It contains Xen mappings, and it
+ * would be a pain to ensure they remain continuously valid throughout.
+ */
+ if ( is_pv_32bit_domain(d) && (pgentry_ptr_to_slot(pl3e) >= 3) )
+ return -EINVAL;
+
+ if ( unlikely(__copy_from_user(&ol3e, pl3e, sizeof(ol3e)) != 0) )
+ return -EFAULT;
+
+ if ( l3e_get_flags(nl3e) & _PAGE_PRESENT )
+ {
+ if ( unlikely(l3e_get_flags(nl3e) & l3_disallow_mask(d)) )
+ {
+ gdprintk(XENLOG_WARNING, "Bad L3 flags %x\n",
+ l3e_get_flags(nl3e) & l3_disallow_mask(d));
+ return -EINVAL;
+ }
+
+ /* Fast path for sufficiently-similar mappings. */
+ if ( !l3e_has_changed(ol3e, nl3e, ~FASTPATH_FLAG_WHITELIST) )
+ {
+ adjust_guest_l3e(nl3e, d);
+ rc = UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, vcpu, preserve_ad);
+ return rc ? 0 : -EFAULT;
+ }
+
+ rc = get_page_from_l3e(nl3e, pfn, d, 0);
+ if ( unlikely(rc < 0) )
+ return rc;
+ rc = 0;
+
+ adjust_guest_l3e(nl3e, d);
+ if ( unlikely(!UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, vcpu,
+ preserve_ad)) )
+ {
+ ol3e = nl3e;
+ rc = -EFAULT;
+ }
+ }
+ else if ( unlikely(!UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, vcpu,
+ preserve_ad)) )
+ {
+ return -EFAULT;
+ }
+
+ if ( likely(rc == 0) )
+ if ( !pv_create_pae_xen_mappings(d, pl3e) )
+ BUG();
+
+ put_page_from_l3e(ol3e, pfn, 0, 1);
+ return rc;
+}
+
+/* Update the L4 entry at pl4e to new value nl4e. pl4e is within frame pfn. */
+static int mod_l4_entry(l4_pgentry_t *pl4e, l4_pgentry_t nl4e,
+ unsigned long pfn, int preserve_ad, struct vcpu *vcpu)
+{
+ struct domain *d = vcpu->domain;
+ l4_pgentry_t ol4e;
+ int rc = 0;
+
+ if ( unlikely(!is_guest_l4_slot(d, pgentry_ptr_to_slot(pl4e))) )
+ {
+ gdprintk(XENLOG_WARNING, "L4 update in Xen-private area, slot %#lx\n",
+ pgentry_ptr_to_slot(pl4e));
+ return -EINVAL;
+ }
+
+ if ( unlikely(__copy_from_user(&ol4e, pl4e, sizeof(ol4e)) != 0) )
+ return -EFAULT;
+
+ if ( l4e_get_flags(nl4e) & _PAGE_PRESENT )
+ {
+ if ( unlikely(l4e_get_flags(nl4e) & L4_DISALLOW_MASK) )
+ {
+ gdprintk(XENLOG_WARNING, "Bad L4 flags %x\n",
+ l4e_get_flags(nl4e) & L4_DISALLOW_MASK);
+ return -EINVAL;
+ }
+
+ /* Fast path for sufficiently-similar mappings. */
+ if ( !l4e_has_changed(ol4e, nl4e, ~FASTPATH_FLAG_WHITELIST) )
+ {
+ adjust_guest_l4e(nl4e, d);
+ rc = UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn, vcpu, preserve_ad);
+ return rc ? 0 : -EFAULT;
+ }
+
+ rc = get_page_from_l4e(nl4e, pfn, d, 0);
+ if ( unlikely(rc < 0) )
+ return rc;
+ rc = 0;
+
+ adjust_guest_l4e(nl4e, d);
+ if ( unlikely(!UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn, vcpu,
+ preserve_ad)) )
+ {
+ ol4e = nl4e;
+ rc = -EFAULT;
+ }
+ }
+ else if ( unlikely(!UPDATE_ENTRY(l4, pl4e, ol4e, nl4e, pfn, vcpu,
+ preserve_ad)) )
+ {
+ return -EFAULT;
+ }
+
+ put_page_from_l4e(ol4e, pfn, 0, 1);
+ return rc;
+}
+
+int pv_new_guest_cr3(unsigned long mfn)
+{
+ struct vcpu *curr = current;
+ struct domain *currd = curr->domain;
+ int rc;
+ unsigned long old_base_mfn;
+
+ if ( is_pv_32bit_domain(currd) )
+ {
+ unsigned long gt_mfn = pagetable_get_pfn(curr->arch.guest_table);
+ l4_pgentry_t *pl4e = map_domain_page(_mfn(gt_mfn));
+
+ rc = mod_l4_entry(pl4e,
+ l4e_from_pfn(mfn,
+ (_PAGE_PRESENT | _PAGE_RW |
+ _PAGE_USER | _PAGE_ACCESSED)),
+ gt_mfn, 0, curr);
+ unmap_domain_page(pl4e);
+ switch ( rc )
+ {
+ case 0:
+ break;
+ case -EINTR:
+ case -ERESTART:
+ return -ERESTART;
+ default:
+ gdprintk(XENLOG_WARNING,
+ "Error while installing new compat baseptr %" PRI_mfn
"\n",
+ mfn);
+ return rc;
+ }
+
+ pv_invalidate_shadow_ldt(curr, false);
+ write_ptbase(curr);
+
+ return 0;
+ }
+
+ rc = put_old_guest_table(curr);
+ if ( unlikely(rc) )
+ return rc;
+
+ old_base_mfn = pagetable_get_pfn(curr->arch.guest_table);
+ /*
+ * This is particularly important when getting restarted after the
+ * previous attempt got preempted in the put-old-MFN phase.
+ */
+ if ( old_base_mfn == mfn )
+ {
+ write_ptbase(curr);
+ return 0;
+ }
+
+ rc = paging_mode_refcounts(currd)
+ ? (get_page_from_mfn(_mfn(mfn), currd) ? 0 : -EINVAL)
+ : get_page_and_type_from_mfn(_mfn(mfn), PGT_root_page_table,
+ currd, 0, true);
+ switch ( rc )
+ {
+ case 0:
+ break;
+ case -EINTR:
+ case -ERESTART:
+ return -ERESTART;
+ default:
+ gdprintk(XENLOG_WARNING,
+ "Error while installing new baseptr %" PRI_mfn "\n", mfn);
+ return rc;
+ }
+
+ pv_invalidate_shadow_ldt(curr, false);
+
+ if ( !VM_ASSIST(currd, m2p_strict) && !paging_mode_refcounts(currd) )
+ fill_ro_mpt(mfn);
+ curr->arch.guest_table = pagetable_from_pfn(mfn);
+ update_cr3(curr);
+
+ write_ptbase(curr);
+
+ if ( likely(old_base_mfn != 0) )
+ {
+ struct page_info *page = mfn_to_page(old_base_mfn);
+
+ if ( paging_mode_refcounts(currd) )
+ put_page(page);
+ else
+ switch ( rc = put_page_and_type_preemptible(page) )
+ {
+ case -EINTR:
+ rc = -ERESTART;
+ /* fallthrough */
+ case -ERESTART:
+ curr->arch.old_guest_table = page;
+ break;
+ default:
+ BUG_ON(rc);
+ break;
+ }
+ }
+
+ return rc;
+}
+
+long do_mmu_update(XEN_GUEST_HANDLE_PARAM(mmu_update_t) ureqs,
+ unsigned int count, XEN_GUEST_HANDLE_PARAM(uint) pdone,
+ unsigned int foreigndom)
+{
+ struct mmu_update req;
+ void *va;
+ unsigned long gpfn, gmfn, mfn;
+ struct page_info *page;
+ unsigned int cmd, i = 0, done = 0, pt_dom;
+ struct vcpu *curr = current, *v = curr;
+ struct domain *d = v->domain, *pt_owner = d, *pg_owner;
+ struct domain_mmap_cache mapcache;
+ uint32_t xsm_needed = 0;
+ uint32_t xsm_checked = 0;
+ int rc = put_old_guest_table(curr);
+
+ if ( unlikely(rc) )
+ {
+ if ( likely(rc == -ERESTART) )
+ rc = hypercall_create_continuation(
+ __HYPERVISOR_mmu_update, "hihi", ureqs, count, pdone,
+ foreigndom);
+ return rc;
+ }
+
+ if ( unlikely(count == MMU_UPDATE_PREEMPTED) &&
+ likely(guest_handle_is_null(ureqs)) )
+ {
+ /*
+ * See the curr->arch.old_guest_table related
+ * hypercall_create_continuation() below.
+ */
+ return (int)foreigndom;
+ }
+
+ if ( unlikely(count & MMU_UPDATE_PREEMPTED) )
+ {
+ count &= ~MMU_UPDATE_PREEMPTED;
+ if ( unlikely(!guest_handle_is_null(pdone)) )
+ (void)copy_from_guest(&done, pdone, 1);
+ }
+ else
+ perfc_incr(calls_to_mmu_update);
+
+ if ( unlikely(!guest_handle_okay(ureqs, count)) )
+ return -EFAULT;
+
+ if ( (pt_dom = foreigndom >> 16) != 0 )
+ {
+ /* Pagetables belong to a foreign domain (PFD). */
+ if ( (pt_owner = rcu_lock_domain_by_id(pt_dom - 1)) == NULL )
+ return -ESRCH;
+
+ if ( pt_owner == d )
+ rcu_unlock_domain(pt_owner);
+ else if ( !pt_owner->vcpu || (v = pt_owner->vcpu[0]) == NULL )
+ {
+ rc = -EINVAL;
+ goto out;
+ }
+ }
+
+ if ( (pg_owner = get_pg_owner((uint16_t)foreigndom)) == NULL )
+ {
+ rc = -ESRCH;
+ goto out;
+ }
+
+ domain_mmap_cache_init(&mapcache);
+
+ for ( i = 0; i < count; i++ )
+ {
+ if ( curr->arch.old_guest_table || (i && hypercall_preempt_check()) )
+ {
+ rc = -ERESTART;
+ break;
+ }
+
+ if ( unlikely(__copy_from_guest(&req, ureqs, 1) != 0) )
+ {
+ rc = -EFAULT;
+ break;
+ }
+
+ cmd = req.ptr & (sizeof(l1_pgentry_t)-1);
+
+ switch ( cmd )
+ {
+ /*
+ * MMU_NORMAL_PT_UPDATE: Normal update to any level of page table.
+ * MMU_UPDATE_PT_PRESERVE_AD: As above but also preserve (OR)
+ * current A/D bits.
+ */
+ case MMU_NORMAL_PT_UPDATE:
+ case MMU_PT_UPDATE_PRESERVE_AD:
+ {
+ p2m_type_t p2mt;
+
+ rc = -EOPNOTSUPP;
+ if ( unlikely(paging_mode_refcounts(pt_owner)) )
+ break;
+
+ xsm_needed |= XSM_MMU_NORMAL_UPDATE;
+ if ( get_pte_flags(req.val) & _PAGE_PRESENT )
+ {
+ xsm_needed |= XSM_MMU_UPDATE_READ;
+ if ( get_pte_flags(req.val) & _PAGE_RW )
+ xsm_needed |= XSM_MMU_UPDATE_WRITE;
+ }
+ if ( xsm_needed != xsm_checked )
+ {
+ rc = xsm_mmu_update(XSM_TARGET, d, pt_owner, pg_owner,
xsm_needed);
+ if ( rc )
+ break;
+ xsm_checked = xsm_needed;
+ }
+ rc = -EINVAL;
+
+ req.ptr -= cmd;
+ gmfn = req.ptr >> PAGE_SHIFT;
+ page = get_page_from_gfn(pt_owner, gmfn, &p2mt, P2M_ALLOC);
+
+ if ( p2m_is_paged(p2mt) )
+ {
+ ASSERT(!page);
+ p2m_mem_paging_populate(pg_owner, gmfn);
+ rc = -ENOENT;
+ break;
+ }
+
+ if ( unlikely(!page) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "Could not get page for normal update\n");
+ break;
+ }
+
+ mfn = page_to_mfn(page);
+ va = map_domain_page_with_cache(mfn, &mapcache);
+ va = (void *)((unsigned long)va +
+ (unsigned long)(req.ptr & ~PAGE_MASK));
+
+ if ( page_lock(page) )
+ {
+ switch ( page->u.inuse.type_info & PGT_type_mask )
+ {
+ case PGT_l1_page_table:
+ {
+ l1_pgentry_t l1e = l1e_from_intpte(req.val);
+ p2m_type_t l1e_p2mt = p2m_ram_rw;
+ struct page_info *target = NULL;
+ p2m_query_t q = (l1e_get_flags(l1e) & _PAGE_RW) ?
+ P2M_UNSHARE : P2M_ALLOC;
+
+ if ( paging_mode_translate(pg_owner) )
+ target = get_page_from_gfn(pg_owner, l1e_get_pfn(l1e),
+ &l1e_p2mt, q);
+
+ if ( p2m_is_paged(l1e_p2mt) )
+ {
+ if ( target )
+ put_page(target);
+ p2m_mem_paging_populate(pg_owner, l1e_get_pfn(l1e));
+ rc = -ENOENT;
+ break;
+ }
+ else if ( p2m_ram_paging_in == l1e_p2mt && !target )
+ {
+ rc = -ENOENT;
+ break;
+ }
+ /* If we tried to unshare and failed */
+ else if ( (q & P2M_UNSHARE) && p2m_is_shared(l1e_p2mt) )
+ {
+ /* We could not have obtained a page ref. */
+ ASSERT(target == NULL);
+ /* And mem_sharing_notify has already been called. */
+ rc = -ENOMEM;
+ break;
+ }
+
+ rc = mod_l1_entry(va, l1e, mfn,
+ cmd == MMU_PT_UPDATE_PRESERVE_AD, v,
+ pg_owner);
+ if ( target )
+ put_page(target);
+ }
+ break;
+ case PGT_l2_page_table:
+ rc = mod_l2_entry(va, l2e_from_intpte(req.val), mfn,
+ cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
+ break;
+ case PGT_l3_page_table:
+ rc = mod_l3_entry(va, l3e_from_intpte(req.val), mfn,
+ cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
+ break;
+ case PGT_l4_page_table:
+ rc = mod_l4_entry(va, l4e_from_intpte(req.val), mfn,
+ cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
+ break;
+ case PGT_writable_page:
+ perfc_incr(writable_mmu_updates);
+ if ( paging_write_guest_entry(v, va, req.val, _mfn(mfn)) )
+ rc = 0;
+ break;
+ }
+ page_unlock(page);
+ if ( rc == -EINTR )
+ rc = -ERESTART;
+ }
+ else if ( get_page_type(page, PGT_writable_page) )
+ {
+ perfc_incr(writable_mmu_updates);
+ if ( paging_write_guest_entry(v, va, req.val, _mfn(mfn)) )
+ rc = 0;
+ put_page_type(page);
+ }
+
+ unmap_domain_page_with_cache(va, &mapcache);
+ put_page(page);
+ }
+ break;
+
+ case MMU_MACHPHYS_UPDATE:
+ if ( unlikely(d != pt_owner) )
+ {
+ rc = -EPERM;
+ break;
+ }
+
+ if ( unlikely(paging_mode_translate(pg_owner)) )
+ {
+ rc = -EINVAL;
+ break;
+ }
+
+ mfn = req.ptr >> PAGE_SHIFT;
+ gpfn = req.val;
+
+ xsm_needed |= XSM_MMU_MACHPHYS_UPDATE;
+ if ( xsm_needed != xsm_checked )
+ {
+ rc = xsm_mmu_update(XSM_TARGET, d, NULL, pg_owner, xsm_needed);
+ if ( rc )
+ break;
+ xsm_checked = xsm_needed;
+ }
+
+ if ( unlikely(!get_page_from_mfn(_mfn(mfn), pg_owner)) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "Could not get page for mach->phys update\n");
+ rc = -EINVAL;
+ break;
+ }
+
+ set_gpfn_from_mfn(mfn, gpfn);
+
+ paging_mark_dirty(pg_owner, _mfn(mfn));
+
+ put_page(mfn_to_page(mfn));
+ break;
+
+ default:
+ rc = -ENOSYS;
+ break;
+ }
+
+ if ( unlikely(rc) )
+ break;
+
+ guest_handle_add_offset(ureqs, 1);
+ }
+
+ if ( rc == -ERESTART )
+ {
+ ASSERT(i < count);
+ rc = hypercall_create_continuation(
+ __HYPERVISOR_mmu_update, "hihi",
+ ureqs, (count - i) | MMU_UPDATE_PREEMPTED, pdone, foreigndom);
+ }
+ else if ( curr->arch.old_guest_table )
+ {
+ XEN_GUEST_HANDLE_PARAM(void) null;
+
+ ASSERT(rc || i == count);
+ set_xen_guest_handle(null, NULL);
+ /*
+ * In order to have a way to communicate the final return value to
+ * our continuation, we pass this in place of "foreigndom", building
+ * on the fact that this argument isn't needed anymore.
+ */
+ rc = hypercall_create_continuation(
+ __HYPERVISOR_mmu_update, "hihi", null,
+ MMU_UPDATE_PREEMPTED, null, rc);
+ }
+
+ put_pg_owner(pg_owner);
+
+ domain_mmap_cache_destroy(&mapcache);
+
+ perfc_add(num_page_updates, i);
+
+ out:
+ if ( pt_owner != d )
+ rcu_unlock_domain(pt_owner);
+
+ /* Add incremental work we have done to the @done output parameter. */
+ if ( unlikely(!guest_handle_is_null(pdone)) )
+ {
+ done += i;
+ copy_to_guest(pdone, &done, 1);
+ }
+
+ return rc;
+}
+
+static int __do_update_va_mapping(unsigned long va, u64 val64,
+ unsigned long flags,
+ struct domain *pg_owner)
+{
+ l1_pgentry_t val = l1e_from_intpte(val64);
+ struct vcpu *curr = current;
+ struct domain *currd = curr->domain;
+ struct page_info *gl1pg;
+ l1_pgentry_t *pl1e;
+ unsigned long bmap_ptr, gl1mfn;
+ cpumask_t *mask = NULL;
+ int rc;
+
+ perfc_incr(calls_to_update_va);
+
+ rc = xsm_update_va_mapping(XSM_TARGET, currd, pg_owner, val);
+ if ( rc )
+ return rc;
+
+ rc = -EINVAL;
+ pl1e = pv_map_guest_l1e(va, &gl1mfn);
+ if ( unlikely(!pl1e || !get_page_from_mfn(_mfn(gl1mfn), currd)) )
+ goto out;
+
+ gl1pg = mfn_to_page(gl1mfn);
+ if ( !page_lock(gl1pg) )
+ {
+ put_page(gl1pg);
+ goto out;
+ }
+
+ if ( (gl1pg->u.inuse.type_info & PGT_type_mask) != PGT_l1_page_table )
+ {
+ page_unlock(gl1pg);
+ put_page(gl1pg);
+ goto out;
+ }
+
+ rc = mod_l1_entry(pl1e, val, gl1mfn, 0, curr, pg_owner);
+
+ page_unlock(gl1pg);
+ put_page(gl1pg);
+
+ out:
+ if ( pl1e )
+ pv_unmap_guest_l1e(pl1e);
+
+ switch ( flags & UVMF_FLUSHTYPE_MASK )
+ {
+ case UVMF_TLB_FLUSH:
+ switch ( (bmap_ptr = flags & ~UVMF_FLUSHTYPE_MASK) )
+ {
+ case UVMF_LOCAL:
+ flush_tlb_local();
+ break;
+ case UVMF_ALL:
+ mask = currd->domain_dirty_cpumask;
+ break;
+ default:
+ mask = this_cpu(scratch_cpumask);
+ rc = vcpumask_to_pcpumask(currd,
+ const_guest_handle_from_ptr(bmap_ptr,
void),
+ mask);
+ break;
+ }
+ if ( mask )
+ flush_tlb_mask(mask);
+ break;
+
+ case UVMF_INVLPG:
+ switch ( (bmap_ptr = flags & ~UVMF_FLUSHTYPE_MASK) )
+ {
+ case UVMF_LOCAL:
+ paging_invlpg(curr, va);
+ break;
+ case UVMF_ALL:
+ mask = currd->domain_dirty_cpumask;
+ break;
+ default:
+ mask = this_cpu(scratch_cpumask);
+ rc = vcpumask_to_pcpumask(currd,
+ const_guest_handle_from_ptr(bmap_ptr,
void),
+ mask);
+ break;
+ }
+ if ( mask )
+ flush_tlb_one_mask(mask, va);
+ break;
+ }
+
+ return rc;
+}
+
+long do_update_va_mapping(unsigned long va, u64 val64,
+ unsigned long flags)
+{
+ return __do_update_va_mapping(va, val64, flags, current->domain);
+}
+
+long do_update_va_mapping_otherdomain(unsigned long va, u64 val64,
+ unsigned long flags,
+ domid_t domid)
+{
+ struct domain *pg_owner;
+ int rc;
+
+ if ( (pg_owner = get_pg_owner(domid)) == NULL )
+ return -ESRCH;
+
+ rc = __do_update_va_mapping(va, val64, flags, pg_owner);
+
+ put_pg_owner(pg_owner);
+
+ return rc;
+}
+
+long do_mmuext_op(XEN_GUEST_HANDLE_PARAM(mmuext_op_t) uops,
+ unsigned int count,
+ XEN_GUEST_HANDLE_PARAM(uint) pdone,
+ unsigned int foreigndom)
+{
+ struct mmuext_op op;
+ unsigned long type;
+ unsigned int i, done = 0;
+ struct vcpu *curr = current;
+ struct domain *currd = curr->domain;
+ struct domain *pg_owner;
+ int rc = put_old_guest_table(curr);
+
+ if ( unlikely(rc) )
+ {
+ if ( likely(rc == -ERESTART) )
+ rc = hypercall_create_continuation(
+ __HYPERVISOR_mmuext_op, "hihi", uops, count, pdone,
+ foreigndom);
+ return rc;
+ }
+
+ if ( unlikely(count == MMU_UPDATE_PREEMPTED) &&
+ likely(guest_handle_is_null(uops)) )
+ {
+ /*
+ * See the curr->arch.old_guest_table related
+ * hypercall_create_continuation() below.
+ */
+ return (int)foreigndom;
+ }
+
+ if ( unlikely(count & MMU_UPDATE_PREEMPTED) )
+ {
+ count &= ~MMU_UPDATE_PREEMPTED;
+ if ( unlikely(!guest_handle_is_null(pdone)) )
+ (void)copy_from_guest(&done, pdone, 1);
+ }
+ else
+ perfc_incr(calls_to_mmuext_op);
+
+ if ( unlikely(!guest_handle_okay(uops, count)) )
+ return -EFAULT;
+
+ if ( (pg_owner = get_pg_owner(foreigndom)) == NULL )
+ return -ESRCH;
+
+ if ( !is_pv_domain(pg_owner) )
+ {
+ put_pg_owner(pg_owner);
+ return -EINVAL;
+ }
+
+ rc = xsm_mmuext_op(XSM_TARGET, currd, pg_owner);
+ if ( rc )
+ {
+ put_pg_owner(pg_owner);
+ return rc;
+ }
+
+ for ( i = 0; i < count; i++ )
+ {
+ if ( curr->arch.old_guest_table || (i && hypercall_preempt_check()) )
+ {
+ rc = -ERESTART;
+ break;
+ }
+
+ if ( unlikely(__copy_from_guest(&op, uops, 1) != 0) )
+ {
+ rc = -EFAULT;
+ break;
+ }
+
+ if ( is_hvm_domain(currd) )
+ {
+ switch ( op.cmd )
+ {
+ case MMUEXT_PIN_L1_TABLE:
+ case MMUEXT_PIN_L2_TABLE:
+ case MMUEXT_PIN_L3_TABLE:
+ case MMUEXT_PIN_L4_TABLE:
+ case MMUEXT_UNPIN_TABLE:
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ goto done;
+ }
+ }
+
+ rc = 0;
+
+ switch ( op.cmd )
+ {
+ struct page_info *page;
+ p2m_type_t p2mt;
+
+ case MMUEXT_PIN_L1_TABLE:
+ type = PGT_l1_page_table;
+ goto pin_page;
+
+ case MMUEXT_PIN_L2_TABLE:
+ type = PGT_l2_page_table;
+ goto pin_page;
+
+ case MMUEXT_PIN_L3_TABLE:
+ type = PGT_l3_page_table;
+ goto pin_page;
+
+ case MMUEXT_PIN_L4_TABLE:
+ if ( is_pv_32bit_domain(pg_owner) )
+ break;
+ type = PGT_l4_page_table;
+
+ pin_page:
+ /* Ignore pinning of invalid paging levels. */
+ if ( (op.cmd - MMUEXT_PIN_L1_TABLE) > (CONFIG_PAGING_LEVELS - 1) )
+ break;
+
+ if ( paging_mode_refcounts(pg_owner) )
+ break;
+
+ page = get_page_from_gfn(pg_owner, op.arg1.mfn, NULL, P2M_ALLOC);
+ if ( unlikely(!page) )
+ {
+ rc = -EINVAL;
+ break;
+ }
+
+ rc = get_page_type_preemptible(page, type);
+ if ( unlikely(rc) )
+ {
+ if ( rc == -EINTR )
+ rc = -ERESTART;
+ else if ( rc != -ERESTART )
+ gdprintk(XENLOG_WARNING,
+ "Error %d while pinning mfn %" PRI_mfn "\n",
+ rc, page_to_mfn(page));
+ if ( page != curr->arch.old_guest_table )
+ put_page(page);
+ break;
+ }
+
+ rc = xsm_memory_pin_page(XSM_HOOK, currd, pg_owner, page);
+ if ( !rc && unlikely(test_and_set_bit(_PGT_pinned,
+ &page->u.inuse.type_info)) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "mfn %" PRI_mfn " already pinned\n",
page_to_mfn(page));
+ rc = -EINVAL;
+ }
+
+ if ( unlikely(rc) )
+ goto pin_drop;
+
+ /* A page is dirtied when its pin status is set. */
+ paging_mark_dirty(pg_owner, _mfn(page_to_mfn(page)));
+
+ /* We can race domain destruction (domain_relinquish_resources). */
+ if ( unlikely(pg_owner != currd) )
+ {
+ bool drop_ref;
+
+ spin_lock(&pg_owner->page_alloc_lock);
+ drop_ref = (pg_owner->is_dying &&
+ test_and_clear_bit(_PGT_pinned,
+ &page->u.inuse.type_info));
+ spin_unlock(&pg_owner->page_alloc_lock);
+ if ( drop_ref )
+ {
+ pin_drop:
+ if ( type == PGT_l1_page_table )
+ put_page_and_type(page);
+ else
+ curr->arch.old_guest_table = page;
+ }
+ }
+ break;
+
+ case MMUEXT_UNPIN_TABLE:
+ if ( paging_mode_refcounts(pg_owner) )
+ break;
+
+ page = get_page_from_gfn(pg_owner, op.arg1.mfn, NULL, P2M_ALLOC);
+ if ( unlikely(!page) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "mfn %" PRI_mfn " bad, or bad owner d%d\n",
+ op.arg1.mfn, pg_owner->domain_id);
+ rc = -EINVAL;
+ break;
+ }
+
+ if ( !test_and_clear_bit(_PGT_pinned, &page->u.inuse.type_info) )
+ {
+ put_page(page);
+ gdprintk(XENLOG_WARNING,
+ "mfn %" PRI_mfn " not pinned\n", op.arg1.mfn);
+ rc = -EINVAL;
+ break;
+ }
+
+ switch ( rc = put_page_and_type_preemptible(page) )
+ {
+ case -EINTR:
+ case -ERESTART:
+ curr->arch.old_guest_table = page;
+ rc = 0;
+ break;
+ default:
+ BUG_ON(rc);
+ break;
+ }
+ put_page(page);
+
+ /* A page is dirtied when its pin status is cleared. */
+ paging_mark_dirty(pg_owner, _mfn(page_to_mfn(page)));
+ break;
+
+ case MMUEXT_NEW_BASEPTR:
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( unlikely(paging_mode_translate(currd)) )
+ rc = -EINVAL;
+ else
+ rc = pv_new_guest_cr3(op.arg1.mfn);
+ break;
+
+ case MMUEXT_NEW_USER_BASEPTR: {
+ unsigned long old_mfn;
+
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( unlikely(paging_mode_translate(currd)) )
+ rc = -EINVAL;
+ if ( unlikely(rc) )
+ break;
+
+ old_mfn = pagetable_get_pfn(curr->arch.guest_table_user);
+ /*
+ * This is particularly important when getting restarted after the
+ * previous attempt got preempted in the put-old-MFN phase.
+ */
+ if ( old_mfn == op.arg1.mfn )
+ break;
+
+ if ( op.arg1.mfn != 0 )
+ {
+ rc = get_page_and_type_from_mfn(
+ _mfn(op.arg1.mfn), PGT_root_page_table, currd, 0, true);
+
+ if ( unlikely(rc) )
+ {
+ if ( rc == -EINTR )
+ rc = -ERESTART;
+ else if ( rc != -ERESTART )
+ gdprintk(XENLOG_WARNING,
+ "Error %d installing new mfn %" PRI_mfn "\n",
+ rc, op.arg1.mfn);
+ break;
+ }
+
+ if ( VM_ASSIST(currd, m2p_strict) )
+ zap_ro_mpt(op.arg1.mfn);
+ }
+
+ curr->arch.guest_table_user = pagetable_from_pfn(op.arg1.mfn);
+
+ if ( old_mfn != 0 )
+ {
+ page = mfn_to_page(old_mfn);
+
+ switch ( rc = put_page_and_type_preemptible(page) )
+ {
+ case -EINTR:
+ rc = -ERESTART;
+ /* fallthrough */
+ case -ERESTART:
+ curr->arch.old_guest_table = page;
+ break;
+ default:
+ BUG_ON(rc);
+ break;
+ }
+ }
+
+ break;
+ }
+
+ case MMUEXT_TLB_FLUSH_LOCAL:
+ if ( likely(currd == pg_owner) )
+ flush_tlb_local();
+ else
+ rc = -EPERM;
+ break;
+
+ case MMUEXT_INVLPG_LOCAL:
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else
+ paging_invlpg(curr, op.arg1.linear_addr);
+ break;
+
+ case MMUEXT_TLB_FLUSH_MULTI:
+ case MMUEXT_INVLPG_MULTI:
+ {
+ cpumask_t *mask = this_cpu(scratch_cpumask);
+
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( unlikely(vcpumask_to_pcpumask(currd,
+ guest_handle_to_param(op.arg2.vcpumask,
+ const_void),
+ mask)) )
+ rc = -EINVAL;
+ if ( unlikely(rc) )
+ break;
+
+ if ( op.cmd == MMUEXT_TLB_FLUSH_MULTI )
+ flush_tlb_mask(mask);
+ else if ( __addr_ok(op.arg1.linear_addr) )
+ flush_tlb_one_mask(mask, op.arg1.linear_addr);
+ break;
+ }
+
+ case MMUEXT_TLB_FLUSH_ALL:
+ if ( likely(currd == pg_owner) )
+ flush_tlb_mask(currd->domain_dirty_cpumask);
+ else
+ rc = -EPERM;
+ break;
+
+ case MMUEXT_INVLPG_ALL:
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( __addr_ok(op.arg1.linear_addr) )
+ flush_tlb_one_mask(currd->domain_dirty_cpumask,
+ op.arg1.linear_addr);
+ break;
+
+ case MMUEXT_FLUSH_CACHE:
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( unlikely(!cache_flush_permitted(currd)) )
+ rc = -EACCES;
+ else
+ wbinvd();
+ break;
+
+ case MMUEXT_FLUSH_CACHE_GLOBAL:
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( likely(cache_flush_permitted(currd)) )
+ {
+ unsigned int cpu;
+ cpumask_t *mask = this_cpu(scratch_cpumask);
+
+ cpumask_clear(mask);
+ for_each_online_cpu(cpu)
+ if ( !cpumask_intersects(mask,
+ per_cpu(cpu_sibling_mask, cpu)) )
+ __cpumask_set_cpu(cpu, mask);
+ flush_mask(mask, FLUSH_CACHE);
+ }
+ else
+ rc = -EINVAL;
+ break;
+
+ case MMUEXT_SET_LDT:
+ {
+ unsigned int ents = op.arg2.nr_ents;
+ unsigned long ptr = ents ? op.arg1.linear_addr : 0;
+
+ if ( unlikely(currd != pg_owner) )
+ rc = -EPERM;
+ else if ( paging_mode_external(currd) )
+ rc = -EINVAL;
+ else if ( ((ptr & (PAGE_SIZE - 1)) != 0) || !__addr_ok(ptr) ||
+ (ents > 8192) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "Bad args to SET_LDT: ptr=%lx, ents=%x\n", ptr, ents);
+ rc = -EINVAL;
+ }
+ else if ( (curr->arch.pv_vcpu.ldt_ents != ents) ||
+ (curr->arch.pv_vcpu.ldt_base != ptr) )
+ {
+ pv_invalidate_shadow_ldt(curr, false);
+ flush_tlb_local();
+ curr->arch.pv_vcpu.ldt_base = ptr;
+ curr->arch.pv_vcpu.ldt_ents = ents;
+ load_LDT(curr);
+ }
+ break;
+ }
+
+ case MMUEXT_CLEAR_PAGE:
+ page = get_page_from_gfn(pg_owner, op.arg1.mfn, &p2mt, P2M_ALLOC);
+ if ( unlikely(p2mt != p2m_ram_rw) && page )
+ {
+ put_page(page);
+ page = NULL;
+ }
+ if ( !page || !get_page_type(page, PGT_writable_page) )
+ {
+ if ( page )
+ put_page(page);
+ gdprintk(XENLOG_WARNING,
+ "Error clearing mfn %" PRI_mfn "\n", op.arg1.mfn);
+ rc = -EINVAL;
+ break;
+ }
+
+ /* A page is dirtied when it's being cleared. */
+ paging_mark_dirty(pg_owner, _mfn(page_to_mfn(page)));
+
+ clear_domain_page(_mfn(page_to_mfn(page)));
+
+ put_page_and_type(page);
+ break;
+
+ case MMUEXT_COPY_PAGE:
+ {
+ struct page_info *src_page, *dst_page;
+
+ src_page = get_page_from_gfn(pg_owner, op.arg2.src_mfn, &p2mt,
+ P2M_ALLOC);
+ if ( unlikely(p2mt != p2m_ram_rw) && src_page )
+ {
+ put_page(src_page);
+ src_page = NULL;
+ }
+ if ( unlikely(!src_page) )
+ {
+ gdprintk(XENLOG_WARNING,
+ "Error copying from mfn %" PRI_mfn "\n",
+ op.arg2.src_mfn);
+ rc = -EINVAL;
+ break;
+ }
+
+ dst_page = get_page_from_gfn(pg_owner, op.arg1.mfn, &p2mt,
+ P2M_ALLOC);
+ if ( unlikely(p2mt != p2m_ram_rw) && dst_page )
+ {
+ put_page(dst_page);
+ dst_page = NULL;
+ }
+ rc = (dst_page &&
+ get_page_type(dst_page, PGT_writable_page)) ? 0 : -EINVAL;
+ if ( unlikely(rc) )
+ {
+ put_page(src_page);
+ if ( dst_page )
+ put_page(dst_page);
+ gdprintk(XENLOG_WARNING,
+ "Error copying to mfn %" PRI_mfn "\n", op.arg1.mfn);
+ break;
+ }
+
+ /* A page is dirtied when it's being copied to. */
+ paging_mark_dirty(pg_owner, _mfn(page_to_mfn(dst_page)));
+
+ copy_domain_page(_mfn(page_to_mfn(dst_page)),
+ _mfn(page_to_mfn(src_page)));
+
+ put_page_and_type(dst_page);
+ put_page(src_page);
+ break;
+ }
+
+ case MMUEXT_MARK_SUPER:
+ case MMUEXT_UNMARK_SUPER:
+ rc = -EOPNOTSUPP;
+ break;
+
+ default:
+ rc = -ENOSYS;
+ break;
+ }
+
+ done:
+ if ( unlikely(rc) )
+ break;
+
+ guest_handle_add_offset(uops, 1);
+ }
+
+ if ( rc == -ERESTART )
+ {
+ ASSERT(i < count);
+ rc = hypercall_create_continuation(
+ __HYPERVISOR_mmuext_op, "hihi",
+ uops, (count - i) | MMU_UPDATE_PREEMPTED, pdone, foreigndom);
+ }
+ else if ( curr->arch.old_guest_table )
+ {
+ XEN_GUEST_HANDLE_PARAM(void) null;
+
+ ASSERT(rc || i == count);
+ set_xen_guest_handle(null, NULL);
+ /*
+ * In order to have a way to communicate the final return value to
+ * our continuation, we pass this in place of "foreigndom", building
+ * on the fact that this argument isn't needed anymore.
+ */
+ rc = hypercall_create_continuation(
+ __HYPERVISOR_mmuext_op, "hihi", null,
+ MMU_UPDATE_PREEMPTED, null, rc);
+ }
+
+ put_pg_owner(pg_owner);
+
+ perfc_add(num_mmuext_ops, i);
+
+ /* Add incremental work we have done to the @done output parameter. */
+ if ( unlikely(!guest_handle_is_null(pdone)) )
+ {
+ done += i;
+ copy_to_guest(pdone, &done, 1);
+ }
+
+ return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.11.0
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