[PATCH 1/7] xen/domain: Drop DOMCRF_dummy

[Andrew Cooper <andrew.cooper3@citrix.com>]

At the moment, there is a tight coupling between the domid and the use of
DOMCRF_dummy.  Instead of using DOMCRF_dummy, base the one relevent decision
on domid alone.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: George Dunlap <George.Dunlap@eu.citrix.com>
CC: Jan Beulich <JBeulich@suse.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Tim Deegan <tim@xen.org>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Julien Grall <julien.grall@arm.com>
---
 xen/arch/arm/mm.c       |  6 +++---
 xen/arch/x86/mm.c       |  6 +++---
 xen/common/domain.c     |  3 ++-
 xen/include/xen/sched.h | 11 +++++++----
 4 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 3c328e2..ce83f69 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -520,7 +520,7 @@ void __init arch_init_memory(void)
      * Any Xen-heap pages that we will allow to be mapped will have
      * their domain field set to dom_xen.
      */
-    dom_xen = domain_create(DOMID_XEN, DOMCRF_dummy, 0, NULL);
+    dom_xen = domain_create(DOMID_XEN, 0, 0, NULL);
     BUG_ON(IS_ERR(dom_xen));
 
     /*
@@ -528,14 +528,14 @@ void __init arch_init_memory(void)
      * This domain owns I/O pages that are within the range of the page_info
      * array. Mappings occur at the priv of the caller.
      */
-    dom_io = domain_create(DOMID_IO, DOMCRF_dummy, 0, NULL);
+    dom_io = domain_create(DOMID_IO, 0, 0, NULL);
     BUG_ON(IS_ERR(dom_io));
 
     /*
      * Initialise our COW domain.
      * This domain owns sharable pages.
      */
-    dom_cow = domain_create(DOMID_COW, DOMCRF_dummy, 0, NULL);
+    dom_cow = domain_create(DOMID_COW, 0, 0, NULL);
     BUG_ON(IS_ERR(dom_cow));
 }
 
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 9b55944..c275d4b 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -271,7 +271,7 @@ void __init arch_init_memory(void)
      * Hidden PCI devices will also be associated with this domain
      * (but be [partly] controlled by Dom0 nevertheless).
      */
-    dom_xen = domain_create(DOMID_XEN, DOMCRF_dummy, 0, NULL);
+    dom_xen = domain_create(DOMID_XEN, 0, 0, NULL);
     BUG_ON(IS_ERR(dom_xen));
     INIT_LIST_HEAD(&dom_xen->arch.pdev_list);
 
@@ -280,14 +280,14 @@ void __init arch_init_memory(void)
      * This domain owns I/O pages that are within the range of the page_info
      * array. Mappings occur at the priv of the caller.
      */
-    dom_io = domain_create(DOMID_IO, DOMCRF_dummy, 0, NULL);
+    dom_io = domain_create(DOMID_IO, 0, 0, NULL);
     BUG_ON(IS_ERR(dom_io));
 
     /*
      * Initialise our COW domain.
      * This domain owns sharable pages.
      */
-    dom_cow = domain_create(DOMID_COW, DOMCRF_dummy, 0, NULL);
+    dom_cow = domain_create(DOMID_COW, 0, 0, NULL);
     BUG_ON(IS_ERR(dom_cow));
 
     /*
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 219a3e3..cd39a58 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -312,7 +312,8 @@ struct domain *domain_create(domid_t domid, unsigned int domcr_flags,
     rangeset_domain_initialise(d);
     init_status |= INIT_rangeset;
 
-    if ( domcr_flags & DOMCRF_dummy )
+    /* DOMID_{XEN,IO,etc} (other than IDLE) are sufficiently constructed. */
+    if ( is_system_domain(d) && !is_idle_domain(d) )
         return d;
 
     if ( !is_idle_domain(d) )
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 39f9386..aa5729b 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -491,9 +491,15 @@ extern spinlock_t domlist_update_lock;
 extern rcu_read_lock_t domlist_read_lock;
 
 extern struct vcpu *idle_vcpu[NR_CPUS];
+
 #define is_idle_domain(d) ((d)->domain_id == DOMID_IDLE)
 #define is_idle_vcpu(v)   (is_idle_domain((v)->domain))
 
+static inline bool is_system_domain(const struct domain *d)
+{
+    return d->domain_id >= DOMID_FIRST_RESERVED;
+}
+
 #define DOMAIN_DESTROYED (1u << 31) /* assumes atomic_t is >= 32 bits */
 #define put_domain(_d) \
   if ( atomic_dec_and_test(&(_d)->refcnt) ) domain_destroy(_d)
@@ -531,7 +537,7 @@ void domain_update_node_affinity(struct domain *d);
 
 /*
  * Create a domain: the configuration is only necessary for real domain
- * (i.e !DOMCRF_dummy, excluded idle domain).
+ * (domid < DOMID_FIRST_RESERVED).
  */
 struct domain *domain_create(domid_t domid, unsigned int domcr_flags,
                              uint32_t ssidref,
@@ -546,9 +552,6 @@ struct domain *domain_create(domid_t domid, unsigned int domcr_flags,
                         by tboot */
 #define _DOMCRF_s3_integrity  2
 #define DOMCRF_s3_integrity   (1U<<_DOMCRF_s3_integrity)
- /* DOMCRF_dummy: Create a dummy domain (not scheduled; not on domain list) */
-#define _DOMCRF_dummy         3
-#define DOMCRF_dummy          (1U<<_DOMCRF_dummy)
  /* DOMCRF_oos_off: dont use out-of-sync optimization for shadow page tables */
 #define _DOMCRF_oos_off         4
 #define DOMCRF_oos_off          (1U<<_DOMCRF_oos_off)
-- 
2.1.4


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