[PATCH RFC v13 09/20] pvh: Use PV e820

[George Dunlap <george.dunlap@eu.citrix.com>]

Allow PV e820 map to be set and read from a PVH domain.  This requires
moving the pv e820 struct out from the pv-specific domain struct and
into the arch domain struct.

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---

CC: Jan Beulich <jbeulich@suse.com>
CC: Tim Deegan <tim@xen.org>
CC: Keir Fraser <keir@xen.org>
---
 xen/arch/x86/domain.c        |    9 +++------
 xen/arch/x86/mm.c            |   26 ++++++++++++--------------
 xen/include/asm-x86/domain.h |   10 +++++-----
 3 files changed, 20 insertions(+), 25 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index ac18aa7..5b7e1b2 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -553,6 +553,7 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags)
         if ( (rc = iommu_domain_init(d)) != 0 )
             goto fail;
     }
+    spin_lock_init(&d->arch.e820_lock);
 
     if ( has_hvm_container_domain(d) )
     {
@@ -563,13 +564,9 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags)
         }
     }
     else
-    {
         /* 64-bit PV guest by default. */
         d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0;
 
-        spin_lock_init(&d->arch.pv_domain.e820_lock);
-    }
-
     /* initialize default tsc behavior in case tools don't */
     tsc_set_info(d, TSC_MODE_DEFAULT, 0UL, 0, 0);
     spin_lock_init(&d->arch.vtsc_lock);
@@ -592,8 +589,8 @@ void arch_domain_destroy(struct domain *d)
 {
     if ( has_hvm_container_domain(d) )
         hvm_domain_destroy(d);
-    else
-        xfree(d->arch.pv_domain.e820);
+
+    xfree(d->arch.e820);
 
     free_domain_pirqs(d);
     if ( !is_idle_domain(d) )
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 120599a..f25df92 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4760,11 +4760,11 @@ long arch_memory_op(int op, XEN_GUEST_HANDLE_PARAM(void) arg)
             return -EFAULT;
         }
 
-        spin_lock(&d->arch.pv_domain.e820_lock);
-        xfree(d->arch.pv_domain.e820);
-        d->arch.pv_domain.e820 = e820;
-        d->arch.pv_domain.nr_e820 = fmap.map.nr_entries;
-        spin_unlock(&d->arch.pv_domain.e820_lock);
+        spin_lock(&d->arch.e820_lock);
+        xfree(d->arch.e820);
+        d->arch.e820 = e820;
+        d->arch.nr_e820 = fmap.map.nr_entries;
+        spin_unlock(&d->arch.e820_lock);
 
         rcu_unlock_domain(d);
         return rc;
@@ -4778,26 +4778,24 @@ long arch_memory_op(int op, XEN_GUEST_HANDLE_PARAM(void) arg)
         if ( copy_from_guest(&map, arg, 1) )
             return -EFAULT;
 
-        spin_lock(&d->arch.pv_domain.e820_lock);
+        spin_lock(&d->arch.e820_lock);
 
         /* Backwards compatibility. */
-        if ( (d->arch.pv_domain.nr_e820 == 0) ||
-             (d->arch.pv_domain.e820 == NULL) )
+        if ( (d->arch.nr_e820 == 0) || (d->arch.e820 == NULL) )
         {
-            spin_unlock(&d->arch.pv_domain.e820_lock);
+            spin_unlock(&d->arch.e820_lock);
             return -ENOSYS;
         }
 
-        map.nr_entries = min(map.nr_entries, d->arch.pv_domain.nr_e820);
-        if ( copy_to_guest(map.buffer, d->arch.pv_domain.e820,
-                           map.nr_entries) ||
+        map.nr_entries = min(map.nr_entries, d->arch.nr_e820);
+        if ( copy_to_guest(map.buffer, d->arch.e820, map.nr_entries) ||
              __copy_to_guest(arg, &map, 1) )
         {
-            spin_unlock(&d->arch.pv_domain.e820_lock);
+            spin_unlock(&d->arch.e820_lock);
             return -EFAULT;
         }
 
-        spin_unlock(&d->arch.pv_domain.e820_lock);
+        spin_unlock(&d->arch.e820_lock);
         return 0;
     }
 
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 0831700..a60d25c 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -234,11 +234,6 @@ struct pv_domain
 
     /* map_domain_page() mapping cache. */
     struct mapcache_domain mapcache;
-
-    /* Pseudophysical e820 map (XENMEM_memory_map).  */
-    spinlock_t e820_lock;
-    struct e820entry *e820;
-    unsigned int nr_e820;
 };
 
 struct arch_domain
@@ -313,6 +308,11 @@ struct arch_domain
                                 (possibly other cases in the future */
     uint64_t vtsc_kerncount; /* for hvm, counts all vtsc */
     uint64_t vtsc_usercount; /* not used for hvm */
+
+    /* Pseudophysical e820 map (XENMEM_memory_map).  */
+    spinlock_t e820_lock;
+    struct e820entry *e820;
+    unsigned int nr_e820;
 } __cacheline_aligned;
 
 #define has_arch_pdevs(d)    (!list_empty(&(d)->arch.pdev_list))
-- 
1.7.9.5