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Re: [Xen-devel] [PATCH v3 08/15] xen/x86: p2m: Use typesafe gfn for the P2M callbacks get_entry and set_entry



On 10/02/2017 01:59 PM, Julien Grall wrote:
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
> Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Acked-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>

> 
> ---
> 
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Cc: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> Cc: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>
> Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
> 
>     Changes in v3:
>         - Add Razvan's acked-by
>         - Add Wei's reviewed-by
> 
>     Changes in v2:
>         - Add Andre's acked
>         - Add Kevin's reviewed (EPT part)
> ---
>  xen/arch/x86/hvm/hvm.c        |  2 +-
>  xen/arch/x86/mm/mem_access.c  | 19 +++++------
>  xen/arch/x86/mm/mem_sharing.c |  4 +--
>  xen/arch/x86/mm/p2m-ept.c     |  6 ++--
>  xen/arch/x86/mm/p2m-pod.c     | 15 +++++----
>  xen/arch/x86/mm/p2m-pt.c      |  6 ++--
>  xen/arch/x86/mm/p2m.c         | 77 
> +++++++++++++++++++++++--------------------
>  xen/include/asm-x86/p2m.h     |  4 +--
>  8 files changed, 73 insertions(+), 60 deletions(-)
> 
> diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
> index 887f0e556c..6b8c4cbdda 100644
> --- a/xen/arch/x86/hvm/hvm.c
> +++ b/xen/arch/x86/hvm/hvm.c
> @@ -1787,7 +1787,7 @@ int hvm_hap_nested_page_fault(paddr_t gpa, unsigned 
> long gla,
>              {
>                  bool_t sve;
>  
> -                p2m->get_entry(p2m, gfn, &p2mt, &p2ma, 0, NULL, &sve);
> +                p2m->get_entry(p2m, _gfn(gfn), &p2mt, &p2ma, 0, NULL, &sve);
>  
>                  if ( !sve && altp2m_vcpu_emulate_ve(curr) )
>                  {
> diff --git a/xen/arch/x86/mm/mem_access.c b/xen/arch/x86/mm/mem_access.c
> index 33a77c9f1d..c0cd0174cf 100644
> --- a/xen/arch/x86/mm/mem_access.c
> +++ b/xen/arch/x86/mm/mem_access.c
> @@ -66,7 +66,7 @@ static int _p2m_get_mem_access(struct p2m_domain *p2m, 
> gfn_t gfn,
>      }
>  
>      gfn_lock(p2m, gfn, 0);
> -    mfn = p2m->get_entry(p2m, gfn_x(gfn), &t, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, gfn, &t, &a, 0, NULL, NULL);
>      gfn_unlock(p2m, gfn, 0);
>  
>      if ( mfn_eq(mfn, INVALID_MFN) )
> @@ -142,7 +142,7 @@ bool p2m_mem_access_check(paddr_t gpa, unsigned long gla,
>                            vm_event_request_t **req_ptr)
>  {
>      struct vcpu *v = current;
> -    unsigned long gfn = gpa >> PAGE_SHIFT;
> +    gfn_t gfn = gaddr_to_gfn(gpa);
>      struct domain *d = v->domain;
>      struct p2m_domain *p2m = NULL;
>      mfn_t mfn;
> @@ -215,7 +215,7 @@ bool p2m_mem_access_check(paddr_t gpa, unsigned long gla,
>          *req_ptr = req;
>  
>          req->reason = VM_EVENT_REASON_MEM_ACCESS;
> -        req->u.mem_access.gfn = gfn;
> +        req->u.mem_access.gfn = gfn_x(gfn);
>          req->u.mem_access.offset = gpa & ((1 << PAGE_SHIFT) - 1);
>          if ( npfec.gla_valid )
>          {
> @@ -247,7 +247,7 @@ int p2m_set_altp2m_mem_access(struct domain *d, struct 
> p2m_domain *hp2m,
>      unsigned long gfn_l = gfn_x(gfn);
>      int rc;
>  
> -    mfn = ap2m->get_entry(ap2m, gfn_l, &t, &old_a, 0, NULL, NULL);
> +    mfn = ap2m->get_entry(ap2m, gfn, &t, &old_a, 0, NULL, NULL);
>  
>      /* Check host p2m if no valid entry in alternate */
>      if ( !mfn_valid(mfn) )
> @@ -264,16 +264,16 @@ int p2m_set_altp2m_mem_access(struct domain *d, struct 
> p2m_domain *hp2m,
>          if ( page_order != PAGE_ORDER_4K )
>          {
>              unsigned long mask = ~((1UL << page_order) - 1);
> -            unsigned long gfn2_l = gfn_l & mask;
> +            gfn_t gfn2 = _gfn(gfn_l & mask);
>              mfn_t mfn2 = _mfn(mfn_x(mfn) & mask);
>  
> -            rc = ap2m->set_entry(ap2m, gfn2_l, mfn2, page_order, t, old_a, 
> 1);
> +            rc = ap2m->set_entry(ap2m, gfn2, mfn2, page_order, t, old_a, 1);
>              if ( rc )
>                  return rc;
>          }
>      }
>  
> -    return ap2m->set_entry(ap2m, gfn_l, mfn, PAGE_ORDER_4K, t, a,
> +    return ap2m->set_entry(ap2m, gfn, mfn, PAGE_ORDER_4K, t, a,
>                             current->domain != d);
>  }
>  
> @@ -295,10 +295,9 @@ static int set_mem_access(struct domain *d, struct 
> p2m_domain *p2m,
>          mfn_t mfn;
>          p2m_access_t _a;
>          p2m_type_t t;
> -        unsigned long gfn_l = gfn_x(gfn);
>  
> -        mfn = p2m->get_entry(p2m, gfn_l, &t, &_a, 0, NULL, NULL);
> -        rc = p2m->set_entry(p2m, gfn_l, mfn, PAGE_ORDER_4K, t, a, -1);
> +        mfn = p2m->get_entry(p2m, gfn, &t, &_a, 0, NULL, NULL);
> +        rc = p2m->set_entry(p2m, gfn, mfn, PAGE_ORDER_4K, t, a, -1);
>      }
>  
>      return rc;
> diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
> index 3ab119cef2..62a3899089 100644
> --- a/xen/arch/x86/mm/mem_sharing.c
> +++ b/xen/arch/x86/mm/mem_sharing.c
> @@ -1234,7 +1234,7 @@ int relinquish_shared_pages(struct domain *d)
>  
>          if ( atomic_read(&d->shr_pages) == 0 )
>              break;
> -        mfn = p2m->get_entry(p2m, gfn, &t, &a, 0, NULL, NULL);
> +        mfn = p2m->get_entry(p2m, _gfn(gfn), &t, &a, 0, NULL, NULL);
>          if ( mfn_valid(mfn) && (t == p2m_ram_shared) )
>          {
>              /* Does not fail with ENOMEM given the DESTROY flag */
> @@ -1243,7 +1243,7 @@ int relinquish_shared_pages(struct domain *d)
>              /* Clear out the p2m entry so no one else may try to
>               * unshare.  Must succeed: we just read the old entry and
>               * we hold the p2m lock. */
> -            set_rc = p2m->set_entry(p2m, gfn, _mfn(0), PAGE_ORDER_4K,
> +            set_rc = p2m->set_entry(p2m, _gfn(gfn), _mfn(0), PAGE_ORDER_4K,
>                                      p2m_invalid, p2m_access_rwx, -1);
>              ASSERT(set_rc == 0);
>              count += 0x10;
> diff --git a/xen/arch/x86/mm/p2m-ept.c b/xen/arch/x86/mm/p2m-ept.c
> index 23c0518733..f14d1686b7 100644
> --- a/xen/arch/x86/mm/p2m-ept.c
> +++ b/xen/arch/x86/mm/p2m-ept.c
> @@ -674,11 +674,12 @@ bool_t ept_handle_misconfig(uint64_t gpa)
>   * Returns: 0 for success, -errno for failure
>   */
>  static int
> -ept_set_entry(struct p2m_domain *p2m, unsigned long gfn, mfn_t mfn, 
> +ept_set_entry(struct p2m_domain *p2m, gfn_t gfn_, mfn_t mfn,
>                unsigned int order, p2m_type_t p2mt, p2m_access_t p2ma,
>                int sve)
>  {
>      ept_entry_t *table, *ept_entry = NULL;
> +    unsigned long gfn = gfn_x(gfn_);
>      unsigned long gfn_remainder = gfn;
>      unsigned int i, target = order / EPT_TABLE_ORDER;
>      unsigned long fn_mask = !mfn_eq(mfn, INVALID_MFN) ? (gfn | mfn_x(mfn)) : 
> gfn;
> @@ -910,11 +911,12 @@ out:
>  
>  /* Read ept p2m entries */
>  static mfn_t ept_get_entry(struct p2m_domain *p2m,
> -                           unsigned long gfn, p2m_type_t *t, p2m_access_t* a,
> +                           gfn_t gfn_, p2m_type_t *t, p2m_access_t* a,
>                             p2m_query_t q, unsigned int *page_order,
>                             bool_t *sve)
>  {
>      ept_entry_t *table = 
> map_domain_page(_mfn(pagetable_get_pfn(p2m_get_pagetable(p2m))));
> +    unsigned long gfn = gfn_x(gfn_);
>      unsigned long gfn_remainder = gfn;
>      ept_entry_t *ept_entry;
>      u32 index;
> diff --git a/xen/arch/x86/mm/p2m-pod.c b/xen/arch/x86/mm/p2m-pod.c
> index eb74e5c01f..c8c8cff014 100644
> --- a/xen/arch/x86/mm/p2m-pod.c
> +++ b/xen/arch/x86/mm/p2m-pod.c
> @@ -543,7 +543,7 @@ p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn, 
> unsigned int order)
>          p2m_type_t t;
>          unsigned int cur_order;
>  
> -        p2m->get_entry(p2m, gfn_x(gfn) + i, &t, &a, 0, &cur_order, NULL);
> +        p2m->get_entry(p2m, gfn_add(gfn, i), &t, &a, 0, &cur_order, NULL);
>          n = 1UL << min(order, cur_order);
>          if ( t == p2m_populate_on_demand )
>              pod += n;
> @@ -603,7 +603,7 @@ p2m_pod_decrease_reservation(struct domain *d, gfn_t gfn, 
> unsigned int order)
>          p2m_access_t a;
>          unsigned int cur_order;
>  
> -        mfn = p2m->get_entry(p2m, gfn_x(gfn) + i, &t, &a, 0, &cur_order, 
> NULL);
> +        mfn = p2m->get_entry(p2m, gfn_add(gfn, i), &t, &a, 0, &cur_order, 
> NULL);
>          if ( order < cur_order )
>              cur_order = order;
>          n = 1UL << cur_order;
> @@ -717,7 +717,8 @@ p2m_pod_zero_check_superpage(struct p2m_domain *p2m, 
> unsigned long gfn)
>          unsigned long k;
>          const struct page_info *page;
>  
> -        mfn = p2m->get_entry(p2m, gfn + i, &type, &a, 0, &cur_order, NULL);
> +        mfn = p2m->get_entry(p2m, _gfn(gfn +  i), &type, &a, 0,
> +                             &cur_order, NULL);
>  
>          /*
>           * Conditions that must be met for superpage-superpage:
> @@ -859,7 +860,9 @@ p2m_pod_zero_check(struct p2m_domain *p2m, unsigned long 
> *gfns, int count)
>      for ( i = 0; i < count; i++ )
>      {
>          p2m_access_t a;
> -        mfns[i] = p2m->get_entry(p2m, gfns[i], types + i, &a, 0, NULL, NULL);
> +
> +        mfns[i] = p2m->get_entry(p2m, _gfn(gfns[i]), types + i, &a,
> +                                 0, NULL, NULL);
>          /*
>           * If this is ram, and not a pagetable or from the xen heap, and
>           * probably not mapped elsewhere, map it; otherwise, skip.
> @@ -988,7 +991,7 @@ p2m_pod_emergency_sweep(struct p2m_domain *p2m)
>      for ( i = p2m->pod.reclaim_single; i > 0 ; i-- )
>      {
>          p2m_access_t a;
> -        (void)p2m->get_entry(p2m, i, &t, &a, 0, NULL, NULL);
> +        (void)p2m->get_entry(p2m, _gfn(i), &t, &a, 0, NULL, NULL);
>          if ( p2m_is_ram(t) )
>          {
>              gfns[j] = i;
> @@ -1237,7 +1240,7 @@ guest_physmap_mark_populate_on_demand(struct domain *d, 
> unsigned long gfn,
>          p2m_access_t a;
>          unsigned int cur_order;
>  
> -        p2m->get_entry(p2m, gfn + i, &ot, &a, 0, &cur_order, NULL);
> +        p2m->get_entry(p2m, _gfn(gfn + i), &ot, &a, 0, &cur_order, NULL);
>          n = 1UL << min(order, cur_order);
>          if ( p2m_is_ram(ot) )
>          {
> diff --git a/xen/arch/x86/mm/p2m-pt.c b/xen/arch/x86/mm/p2m-pt.c
> index 0e63d6ed11..4bfec4f5f0 100644
> --- a/xen/arch/x86/mm/p2m-pt.c
> +++ b/xen/arch/x86/mm/p2m-pt.c
> @@ -479,12 +479,13 @@ int p2m_pt_handle_deferred_changes(uint64_t gpa)
>  
>  /* Returns: 0 for success, -errno for failure */
>  static int
> -p2m_pt_set_entry(struct p2m_domain *p2m, unsigned long gfn, mfn_t mfn,
> +p2m_pt_set_entry(struct p2m_domain *p2m, gfn_t gfn_, mfn_t mfn,
>                   unsigned int page_order, p2m_type_t p2mt, p2m_access_t p2ma,
>                   int sve)
>  {
>      /* XXX -- this might be able to be faster iff current->domain == d */
>      void *table;
> +    unsigned long gfn = gfn_x(gfn_);
>      unsigned long i, gfn_remainder = gfn;
>      l1_pgentry_t *p2m_entry, entry_content;
>      /* Intermediate table to free if we're replacing it with a superpage. */
> @@ -731,11 +732,12 @@ p2m_pt_set_entry(struct p2m_domain *p2m, unsigned long 
> gfn, mfn_t mfn,
>  }
>  
>  static mfn_t
> -p2m_pt_get_entry(struct p2m_domain *p2m, unsigned long gfn,
> +p2m_pt_get_entry(struct p2m_domain *p2m, gfn_t gfn_,
>                   p2m_type_t *t, p2m_access_t *a, p2m_query_t q,
>                   unsigned int *page_order, bool_t *sve)
>  {
>      mfn_t mfn;
> +    unsigned long gfn = gfn_x(gfn_);
>      paddr_t addr = ((paddr_t)gfn) << PAGE_SHIFT;
>      l2_pgentry_t *l2e;
>      l1_pgentry_t *l1e;
> diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
> index 0b479105b9..35d4a15391 100644
> --- a/xen/arch/x86/mm/p2m.c
> +++ b/xen/arch/x86/mm/p2m.c
> @@ -415,11 +415,12 @@ void p2m_unlock_and_tlb_flush(struct p2m_domain *p2m)
>          mm_write_unlock(&p2m->lock);
>  }
>  
> -mfn_t __get_gfn_type_access(struct p2m_domain *p2m, unsigned long gfn,
> +mfn_t __get_gfn_type_access(struct p2m_domain *p2m, unsigned long gfn_l,
>                      p2m_type_t *t, p2m_access_t *a, p2m_query_t q,
>                      unsigned int *page_order, bool_t locked)
>  {
>      mfn_t mfn;
> +    gfn_t gfn = _gfn(gfn_l);
>  
>      /* Unshare makes no sense withuot populate. */
>      if ( q & P2M_UNSHARE )
> @@ -430,7 +431,7 @@ mfn_t __get_gfn_type_access(struct p2m_domain *p2m, 
> unsigned long gfn,
>          /* Not necessarily true, but for non-translated guests, we claim
>           * it's the most generic kind of memory */
>          *t = p2m_ram_rw;
> -        return _mfn(gfn);
> +        return _mfn(gfn_l);
>      }
>  
>      if ( locked )
> @@ -444,8 +445,8 @@ mfn_t __get_gfn_type_access(struct p2m_domain *p2m, 
> unsigned long gfn,
>          ASSERT(p2m_is_hostp2m(p2m));
>          /* Try to unshare. If we fail, communicate ENOMEM without
>           * sleeping. */
> -        if ( mem_sharing_unshare_page(p2m->domain, gfn, 0) < 0 )
> -            (void)mem_sharing_notify_enomem(p2m->domain, gfn, 0);
> +        if ( mem_sharing_unshare_page(p2m->domain, gfn_l, 0) < 0 )
> +            (void)mem_sharing_notify_enomem(p2m->domain, gfn_l, 0);
>          mfn = p2m->get_entry(p2m, gfn, t, a, q, page_order, NULL);
>      }
>  
> @@ -556,7 +557,7 @@ int p2m_set_entry(struct p2m_domain *p2m, unsigned long 
> gfn, mfn_t mfn,
>          else
>              order = 0;
>  
> -        set_rc = p2m->set_entry(p2m, gfn, mfn, order, p2mt, p2ma, -1);
> +        set_rc = p2m->set_entry(p2m, _gfn(gfn), mfn, order, p2mt, p2ma, -1);
>          if ( set_rc )
>              rc = set_rc;
>  
> @@ -735,7 +736,8 @@ p2m_remove_page(struct p2m_domain *p2m, unsigned long 
> gfn, unsigned long mfn,
>      {
>          for ( i = 0; i < (1UL << page_order); i++ )
>          {
> -            mfn_return = p2m->get_entry(p2m, gfn + i, &t, &a, 0, NULL, NULL);
> +            mfn_return = p2m->get_entry(p2m, _gfn(gfn + i), &t, &a, 0,
> +                                        NULL, NULL);
>              if ( !p2m_is_grant(t) && !p2m_is_shared(t) && !p2m_is_foreign(t) 
> )
>                  set_gpfn_from_mfn(mfn+i, INVALID_M2P_ENTRY);
>              ASSERT( !p2m_is_valid(t) || mfn + i == mfn_x(mfn_return) );
> @@ -762,7 +764,8 @@ guest_physmap_add_entry(struct domain *d, gfn_t gfn, 
> mfn_t mfn,
>                          unsigned int page_order, p2m_type_t t)
>  {
>      struct p2m_domain *p2m = p2m_get_hostp2m(d);
> -    unsigned long i, ogfn;
> +    unsigned long i;
> +    gfn_t ogfn;
>      p2m_type_t ot;
>      p2m_access_t a;
>      mfn_t omfn;
> @@ -803,7 +806,7 @@ guest_physmap_add_entry(struct domain *d, gfn_t gfn, 
> mfn_t mfn,
>      /* First, remove m->p mappings for existing p->m mappings */
>      for ( i = 0; i < (1UL << page_order); i++ )
>      {
> -        omfn = p2m->get_entry(p2m, gfn_x(gfn_add(gfn, i)), &ot,
> +        omfn = p2m->get_entry(p2m, gfn_add(gfn, i), &ot,
>                                &a, 0, NULL, NULL);
>          if ( p2m_is_shared(ot) )
>          {
> @@ -831,7 +834,7 @@ guest_physmap_add_entry(struct domain *d, gfn_t gfn, 
> mfn_t mfn,
>                                                  0);
>                  return rc;
>              }
> -            omfn = p2m->get_entry(p2m, gfn_x(gfn_add(gfn, i)),
> +            omfn = p2m->get_entry(p2m, gfn_add(gfn, i),
>                                    &ot, &a, 0, NULL, NULL);
>              ASSERT(!p2m_is_shared(ot));
>          }
> @@ -873,21 +876,24 @@ guest_physmap_add_entry(struct domain *d, gfn_t gfn, 
> mfn_t mfn,
>          }
>          if ( page_get_owner(mfn_to_page(mfn_add(mfn, i))) != d )
>              continue;
> -        ogfn = mfn_to_gfn(d, mfn_add(mfn, i));
> -        if ( (ogfn != INVALID_M2P_ENTRY) && (ogfn != gfn_x(gfn_add(gfn, i))) 
> )
> +        ogfn = _gfn(mfn_to_gfn(d, mfn_add(mfn, i)));
> +        if ( !gfn_eq(ogfn, _gfn(INVALID_M2P_ENTRY)) &&
> +             !gfn_eq(ogfn, gfn_add(gfn, i)) )
>          {
>              /* This machine frame is already mapped at another physical
>               * address */
>              P2M_DEBUG("aliased! mfn=%#lx, old gfn=%#lx, new gfn=%#lx\n",
> -                      mfn_x(mfn_add(mfn, i)), ogfn, gfn_x(gfn_add(gfn, i)));
> +                      mfn_x(mfn_add(mfn, i)), gfn_x(ogfn),
> +                      gfn_x(gfn_add(gfn, i)));
>              omfn = p2m->get_entry(p2m, ogfn, &ot, &a, 0, NULL, NULL);
>              if ( p2m_is_ram(ot) && !p2m_is_paged(ot) )
>              {
>                  ASSERT(mfn_valid(omfn));
>                  P2M_DEBUG("old gfn=%#lx -> mfn %#lx\n",
> -                          ogfn , mfn_x(omfn));
> +                          gfn_x(ogfn) , mfn_x(omfn));
>                  if ( mfn_eq(omfn, mfn_add(mfn, i)) )
> -                    p2m_remove_page(p2m, ogfn, mfn_x(mfn_add(mfn, i)), 0);
> +                    p2m_remove_page(p2m, gfn_x(ogfn), mfn_x(mfn_add(mfn, i)),
> +                                    0);
>              }
>          }
>      }
> @@ -948,7 +954,7 @@ int p2m_change_type_one(struct domain *d, unsigned long 
> gfn,
>  
>      gfn_lock(p2m, gfn, 0);
>  
> -    mfn = p2m->get_entry(p2m, gfn, &pt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &pt, &a, 0, NULL, NULL);
>      rc = likely(pt == ot)
>           ? p2m_set_entry(p2m, gfn, mfn, PAGE_ORDER_4K, nt,
>                           p2m->default_access)
> @@ -1065,14 +1071,15 @@ int p2m_finish_type_change(struct domain *d,
>   *    1 + new order  for caller to retry with smaller order (guaranteed
>   *                   to be smaller than order passed in)
>   */
> -static int set_typed_p2m_entry(struct domain *d, unsigned long gfn, mfn_t 
> mfn,
> -                               unsigned int order, p2m_type_t gfn_p2mt,
> -                               p2m_access_t access)
> +static int set_typed_p2m_entry(struct domain *d, unsigned long gfn_l,
> +                               mfn_t mfn, unsigned int order,
> +                               p2m_type_t gfn_p2mt, p2m_access_t access)
>  {
>      int rc = 0;
>      p2m_access_t a;
>      p2m_type_t ot;
>      mfn_t omfn;
> +    gfn_t gfn = _gfn(gfn_l);
>      unsigned int cur_order = 0;
>      struct p2m_domain *p2m = p2m_get_hostp2m(d);
>  
> @@ -1103,11 +1110,11 @@ static int set_typed_p2m_entry(struct domain *d, 
> unsigned long gfn, mfn_t mfn,
>          }
>      }
>  
> -    P2M_DEBUG("set %d %lx %lx\n", gfn_p2mt, gfn, mfn_x(mfn));
> -    rc = p2m_set_entry(p2m, gfn, mfn, order, gfn_p2mt, access);
> +    P2M_DEBUG("set %d %lx %lx\n", gfn_p2mt, gfn_l, mfn_x(mfn));
> +    rc = p2m_set_entry(p2m, gfn_l, mfn, order, gfn_p2mt, access);
>      if ( rc )
>          gdprintk(XENLOG_ERR, "p2m_set_entry: %#lx:%u -> %d (0x%"PRI_mfn")\n",
> -                 gfn, order, rc, mfn_x(mfn));
> +                 gfn_l, order, rc, mfn_x(mfn));
>      else if ( p2m_is_pod(ot) )
>      {
>          pod_lock(p2m);
> @@ -1157,7 +1164,7 @@ int set_identity_p2m_entry(struct domain *d, unsigned 
> long gfn,
>  
>      gfn_lock(p2m, gfn, 0);
>  
> -    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>  
>      if ( p2mt == p2m_invalid || p2mt == p2m_mmio_dm )
>          ret = p2m_set_entry(p2m, gfn, _mfn(gfn), PAGE_ORDER_4K,
> @@ -1201,7 +1208,7 @@ int clear_mmio_p2m_entry(struct domain *d, unsigned 
> long gfn, mfn_t mfn,
>          return -EIO;
>  
>      gfn_lock(p2m, gfn, order);
> -    actual_mfn = p2m->get_entry(p2m, gfn, &t, &a, 0, &cur_order, NULL);
> +    actual_mfn = p2m->get_entry(p2m, _gfn(gfn), &t, &a, 0, &cur_order, NULL);
>      if ( cur_order < order )
>      {
>          rc = cur_order + 1;
> @@ -1245,7 +1252,7 @@ int clear_identity_p2m_entry(struct domain *d, unsigned 
> long gfn)
>  
>      gfn_lock(p2m, gfn, 0);
>  
> -    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>      if ( p2mt == p2m_mmio_direct && mfn_x(mfn) == gfn )
>      {
>          ret = p2m_set_entry(p2m, gfn, INVALID_MFN, PAGE_ORDER_4K,
> @@ -1278,7 +1285,7 @@ int set_shared_p2m_entry(struct domain *d, unsigned 
> long gfn, mfn_t mfn)
>          return -EIO;
>  
>      gfn_lock(p2m, gfn, 0);
> -    omfn = p2m->get_entry(p2m, gfn, &ot, &a, 0, NULL, NULL);
> +    omfn = p2m->get_entry(p2m, _gfn(gfn), &ot, &a, 0, NULL, NULL);
>      /* At the moment we only allow p2m change if gfn has already been made
>       * sharable first */
>      ASSERT(p2m_is_shared(ot));
> @@ -1330,7 +1337,7 @@ int p2m_mem_paging_nominate(struct domain *d, unsigned 
> long gfn)
>  
>      gfn_lock(p2m, gfn, 0);
>  
> -    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>  
>      /* Check if mfn is valid */
>      if ( !mfn_valid(mfn) )
> @@ -1392,7 +1399,7 @@ int p2m_mem_paging_evict(struct domain *d, unsigned 
> long gfn)
>      gfn_lock(p2m, gfn, 0);
>  
>      /* Get mfn */
> -    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>      if ( unlikely(!mfn_valid(mfn)) )
>          goto out;
>  
> @@ -1524,7 +1531,7 @@ void p2m_mem_paging_populate(struct domain *d, unsigned 
> long gfn)
>  
>      /* Fix p2m mapping */
>      gfn_lock(p2m, gfn, 0);
> -    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>      /* Allow only nominated or evicted pages to enter page-in path */
>      if ( p2mt == p2m_ram_paging_out || p2mt == p2m_ram_paged )
>      {
> @@ -1586,7 +1593,7 @@ int p2m_mem_paging_prep(struct domain *d, unsigned long 
> gfn, uint64_t buffer)
>  
>      gfn_lock(p2m, gfn, 0);
>  
> -    mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +    mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>  
>      ret = -ENOENT;
>      /* Allow missing pages */
> @@ -1674,7 +1681,7 @@ void p2m_mem_paging_resume(struct domain *d, 
> vm_event_response_t *rsp)
>          unsigned long gfn = rsp->u.mem_access.gfn;
>  
>          gfn_lock(p2m, gfn, 0);
> -        mfn = p2m->get_entry(p2m, gfn, &p2mt, &a, 0, NULL, NULL);
> +        mfn = p2m->get_entry(p2m, _gfn(gfn), &p2mt, &a, 0, NULL, NULL);
>          /*
>           * Allow only pages which were prepared properly, or pages which
>           * were nominated but not evicted.
> @@ -2263,7 +2270,7 @@ int p2m_change_altp2m_gfn(struct domain *d, unsigned 
> int idx,
>      p2m_lock(hp2m);
>      p2m_lock(ap2m);
>  
> -    mfn = ap2m->get_entry(ap2m, gfn_x(old_gfn), &t, &a, 0, NULL, NULL);
> +    mfn = ap2m->get_entry(ap2m, old_gfn, &t, &a, 0, NULL, NULL);
>  
>      if ( gfn_eq(new_gfn, INVALID_GFN) )
>      {
> @@ -2292,21 +2299,21 @@ int p2m_change_altp2m_gfn(struct domain *d, unsigned 
> int idx,
>              gfn = _gfn(gfn_x(old_gfn) & mask);
>              mfn = _mfn(mfn_x(mfn) & mask);
>  
> -            if ( ap2m->set_entry(ap2m, gfn_x(gfn), mfn, page_order, t, a, 1) 
> )
> +            if ( ap2m->set_entry(ap2m, gfn, mfn, page_order, t, a, 1) )
>                  goto out;
>          }
>      }
>  
> -    mfn = ap2m->get_entry(ap2m, gfn_x(new_gfn), &t, &a, 0, NULL, NULL);
> +    mfn = ap2m->get_entry(ap2m, new_gfn, &t, &a, 0, NULL, NULL);
>  
>      if ( !mfn_valid(mfn) )
> -        mfn = hp2m->get_entry(hp2m, gfn_x(new_gfn), &t, &a, 0, NULL, NULL);
> +        mfn = hp2m->get_entry(hp2m, new_gfn, &t, &a, 0, NULL, NULL);
>  
>      /* Note: currently it is not safe to remap to a shared entry */
>      if ( !mfn_valid(mfn) || (t != p2m_ram_rw) )
>          goto out;
>  
> -    if ( !ap2m->set_entry(ap2m, gfn_x(old_gfn), mfn, PAGE_ORDER_4K, t, a,
> +    if ( !ap2m->set_entry(ap2m, old_gfn, mfn, PAGE_ORDER_4K, t, a,
>                            (current->domain != d)) )
>      {
>          rc = 0;
> diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
> index 8f3409b400..1c9a51e9ad 100644
> --- a/xen/include/asm-x86/p2m.h
> +++ b/xen/include/asm-x86/p2m.h
> @@ -234,13 +234,13 @@ struct p2m_domain {
>      struct page_list_head pages;
>  
>      int                (*set_entry)(struct p2m_domain *p2m,
> -                                    unsigned long gfn,
> +                                    gfn_t gfn,
>                                      mfn_t mfn, unsigned int page_order,
>                                      p2m_type_t p2mt,
>                                      p2m_access_t p2ma,
>                                      int sve);
>      mfn_t              (*get_entry)(struct p2m_domain *p2m,
> -                                    unsigned long gfn,
> +                                    gfn_t gfn,
>                                      p2m_type_t *p2mt,
>                                      p2m_access_t *p2ma,
>                                      p2m_query_t q,
> 


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