[PATCH v3 04/14] xen: Convert hotplug page function to use typesafe MFN

From: Julien Grall <julien.grall@arm.com>
To: xen-devel@lists.xenproject.org
Cc: "Stefano Stabellini" <sstabellini@kernel.org>,
	"Wei Liu" <wl@xen.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
	"George Dunlap" <George.Dunlap@eu.citrix.com>,
	"Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Ian Jackson" <ian.jackson@eu.citrix.com>,
	"Tim Deegan" <tim@xen.org>, "Julien Grall" <julien.grall@arm.com>,
	"Jan Beulich" <jbeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [PATCH v3 04/14] xen: Convert hotplug page function to use typesafe MFN
Date: Mon,  3 Jun 2019 17:03:40 +0100	[thread overview]
Message-ID: <20190603160350.29806-5-julien.grall@arm.com> (raw)
In-Reply-To: <20190603160350.29806-1-julien.grall@arm.com>

Convert online_page, offline_page and query_page_offline to use
typesafe MFN.

At the same time, the typesafe is propagated as far as possible without
major modifications.

Note, for clarity, the words have been re-ordered in the error message
updated by this patch.

No functional changes.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

---
    Changes in v3:
        - Mention in the commit message that the typesafe is propagated

    Changes in v2:
        - Update error message
        - Add Jan's acked-by
---
 xen/arch/x86/cpu/mcheck/mcaction.c | 18 ++++++++++--------
 xen/common/page_alloc.c            | 24 ++++++++++++------------
 xen/common/sysctl.c                | 14 +++++++-------
 xen/include/xen/mm.h               |  6 +++---
 4 files changed, 32 insertions(+), 30 deletions(-)

diff --git a/xen/arch/x86/cpu/mcheck/mcaction.c b/xen/arch/x86/cpu/mcheck/mcaction.c
index e42267414e..69332fb84d 100644
--- a/xen/arch/x86/cpu/mcheck/mcaction.c
+++ b/xen/arch/x86/cpu/mcheck/mcaction.c
@@ -6,7 +6,7 @@
 
 static struct mcinfo_recovery *
 mci_action_add_pageoffline(int bank, struct mc_info *mi,
-                           uint64_t mfn, uint32_t status)
+                           mfn_t mfn, uint32_t status)
 {
     struct mcinfo_recovery *rec;
 
@@ -22,7 +22,7 @@ mci_action_add_pageoffline(int bank, struct mc_info *mi,
 
     rec->mc_bank = bank;
     rec->action_types = MC_ACTION_PAGE_OFFLINE;
-    rec->action_info.page_retire.mfn = mfn;
+    rec->action_info.page_retire.mfn = mfn_x(mfn);
     rec->action_info.page_retire.status = status;
     return rec;
 }
@@ -42,7 +42,8 @@ mc_memerr_dhandler(struct mca_binfo *binfo,
     struct mcinfo_bank *bank = binfo->mib;
     struct mcinfo_global *global = binfo->mig;
     struct domain *d;
-    unsigned long mfn, gfn;
+    mfn_t mfn;
+    unsigned long gfn;
     uint32_t status;
     int vmce_vcpuid;
     unsigned int mc_vcpuid;
@@ -54,11 +55,12 @@ mc_memerr_dhandler(struct mca_binfo *binfo,
         return;
     }
 
-    mfn = bank->mc_addr >> PAGE_SHIFT;
+    mfn = maddr_to_mfn(bank->mc_addr);
     if ( offline_page(mfn, 1, &status) )
     {
         dprintk(XENLOG_WARNING,
-                "Failed to offline page %lx for MCE error\n", mfn);
+                "Failed to offline page %"PRI_mfn" for MCE error\n",
+                mfn_x(mfn));
         return;
     }
 
@@ -89,10 +91,10 @@ mc_memerr_dhandler(struct mca_binfo *binfo,
                 ASSERT(d);
                 gfn = get_gpfn_from_mfn((bank->mc_addr) >> PAGE_SHIFT);
 
-                if ( unmmap_broken_page(d, _mfn(mfn), gfn) )
+                if ( unmmap_broken_page(d, mfn, gfn) )
                 {
-                    printk("Unmap broken memory %lx for DOM%d failed\n",
-                           mfn, d->domain_id);
+                    printk("Unmap broken memory %"PRI_mfn" for DOM%d failed\n",
+                           mfn_x(mfn), d->domain_id);
                     goto vmce_failed;
                 }
 
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 7825fd8c42..7075e084b4 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -1556,23 +1556,23 @@ static int reserve_heap_page(struct page_info *pg)
 
 }
 
-int offline_page(unsigned long mfn, int broken, uint32_t *status)
+int offline_page(mfn_t mfn, int broken, uint32_t *status)
 {
     unsigned long old_info = 0;
     struct domain *owner;
     struct page_info *pg;
 
-    if ( !mfn_valid(_mfn(mfn)) )
+    if ( !mfn_valid(mfn) )
     {
         dprintk(XENLOG_WARNING,
-                "try to offline page out of range %lx\n", mfn);
+                "try to offline out of range page %"PRI_mfn"\n", mfn_x(mfn));
         return -EINVAL;
     }
 
     *status = 0;
-    pg = mfn_to_page(_mfn(mfn));
+    pg = mfn_to_page(mfn);
 
-    if ( is_xen_fixed_mfn(mfn) )
+    if ( is_xen_fixed_mfn(mfn_x(mfn)) )
     {
         *status = PG_OFFLINE_XENPAGE | PG_OFFLINE_FAILED |
           (DOMID_XEN << PG_OFFLINE_OWNER_SHIFT);
@@ -1583,7 +1583,7 @@ int offline_page(unsigned long mfn, int broken, uint32_t *status)
      * N.B. xen's txt in x86_64 is marked reserved and handled already.
      * Also kexec range is reserved.
      */
-    if ( !page_is_ram_type(mfn, RAM_TYPE_CONVENTIONAL) )
+    if ( !page_is_ram_type(mfn_x(mfn), RAM_TYPE_CONVENTIONAL) )
     {
         *status = PG_OFFLINE_FAILED | PG_OFFLINE_NOT_CONV_RAM;
         return -EINVAL;
@@ -1665,19 +1665,19 @@ int offline_page(unsigned long mfn, int broken, uint32_t *status)
  *   The caller should make sure end_pfn <= max_page,
  *   if not, expand_pages() should be called prior to online_page().
  */
-unsigned int online_page(unsigned long mfn, uint32_t *status)
+unsigned int online_page(mfn_t mfn, uint32_t *status)
 {
     unsigned long x, nx, y;
     struct page_info *pg;
     int ret;
 
-    if ( !mfn_valid(_mfn(mfn)) )
+    if ( !mfn_valid(mfn) )
     {
         dprintk(XENLOG_WARNING, "call expand_pages() first\n");
         return -EINVAL;
     }
 
-    pg = mfn_to_page(_mfn(mfn));
+    pg = mfn_to_page(mfn);
 
     spin_lock(&heap_lock);
 
@@ -1718,11 +1718,11 @@ unsigned int online_page(unsigned long mfn, uint32_t *status)
     return ret;
 }
 
-int query_page_offline(unsigned long mfn, uint32_t *status)
+int query_page_offline(mfn_t mfn, uint32_t *status)
 {
     struct page_info *pg;
 
-    if ( !mfn_valid(_mfn(mfn)) || !page_is_ram_type(mfn, RAM_TYPE_CONVENTIONAL) )
+    if ( !mfn_valid(mfn) || !page_is_ram_type(mfn_x(mfn), RAM_TYPE_CONVENTIONAL) )
     {
         dprintk(XENLOG_WARNING, "call expand_pages() first\n");
         return -EINVAL;
@@ -1731,7 +1731,7 @@ int query_page_offline(unsigned long mfn, uint32_t *status)
     *status = 0;
     spin_lock(&heap_lock);
 
-    pg = mfn_to_page(_mfn(mfn));
+    pg = mfn_to_page(mfn);
 
     if ( page_state_is(pg, offlining) )
         *status |= PG_OFFLINE_STATUS_OFFLINE_PENDING;
diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
index 765effde8d..fcf2d2fd7c 100644
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -185,7 +185,7 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
     case XEN_SYSCTL_page_offline_op:
     {
         uint32_t *status, *ptr;
-        unsigned long pfn;
+        mfn_t mfn;
 
         ret = xsm_page_offline(XSM_HOOK, op->u.page_offline.cmd);
         if ( ret )
@@ -204,21 +204,21 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
         memset(status, PG_OFFLINE_INVALID, sizeof(uint32_t) *
                       (op->u.page_offline.end - op->u.page_offline.start + 1));
 
-        for ( pfn = op->u.page_offline.start;
-              pfn <= op->u.page_offline.end;
-              pfn ++ )
+        for ( mfn = _mfn(op->u.page_offline.start);
+              mfn_x(mfn) <= op->u.page_offline.end;
+              mfn = mfn_add(mfn, 1) )
         {
             switch ( op->u.page_offline.cmd )
             {
                 /* Shall revert her if failed, or leave caller do it? */
                 case sysctl_page_offline:
-                    ret = offline_page(pfn, 0, ptr++);
+                    ret = offline_page(mfn, 0, ptr++);
                     break;
                 case sysctl_page_online:
-                    ret = online_page(pfn, ptr++);
+                    ret = online_page(mfn, ptr++);
                     break;
                 case sysctl_query_page_offline:
-                    ret = query_page_offline(pfn, ptr++);
+                    ret = query_page_offline(mfn, ptr++);
                     break;
                 default:
                     ret = -EINVAL;
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 7fc3039593..196ce9fcda 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -206,9 +206,9 @@ unsigned long avail_domheap_pages(void);
 unsigned long avail_node_heap_pages(unsigned int);
 #define alloc_domheap_page(d,f) (alloc_domheap_pages(d,0,f))
 #define free_domheap_page(p)  (free_domheap_pages(p,0))
-unsigned int online_page(unsigned long mfn, uint32_t *status);
-int offline_page(unsigned long mfn, int broken, uint32_t *status);
-int query_page_offline(unsigned long mfn, uint32_t *status);
+unsigned int online_page(mfn_t mfn, uint32_t *status);
+int offline_page(mfn_t mfn, int broken, uint32_t *status);
+int query_page_offline(mfn_t mfn, uint32_t *status);
 
 void heap_init_late(void);
 
-- 
2.11.0


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