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[Xen-changelog] [xen master] add xenstore domain flag to hypervisor



commit 5513bd0b4675e2fa2ff4e9a06885f16727901805
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Jan 12 11:29:55 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jan 12 11:29:55 2016 +0100

    add xenstore domain flag to hypervisor
    
    In order to be able to have full support of a xenstore domain in Xen
    add a "Xenstore-domain" flag to the hypervisor. This flag must be
    specified at domain creation time and is returned by
    XEN_DOMCTL_getdomaininfo.
    
    It will allow the domain to retrieve domain information by issuing the
    XEN_DOMCTL_getdomaininfo itself in order to be able to check for
    domains having been destroyed. At the same time this flag will inhibit
    the domain to be migrated, as this wouldn't be a very wise thing to do.
    
    In case of a later support of a rebootable Dom0 this flag will allow to
    recognize a xenstore domain already being present to connect to.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/common/domain.c         |    6 ++++++
 xen/common/domctl.c         |   14 +++++++++-----
 xen/include/public/domctl.h |    6 ++++++
 xen/include/xen/sched.h     |    5 +++++
 xen/include/xsm/dummy.h     |    6 ++++++
 xen/include/xsm/xsm.h       |    1 +
 6 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index 1017efb..2979c1b 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -318,6 +318,12 @@ struct domain *domain_create(domid_t domid, unsigned int 
domcr_flags,
         hardware_domain = d;
     }
 
+    if ( domcr_flags & DOMCRF_xs_domain )
+    {
+        d->is_xenstore = 1;
+        d->disable_migrate = 1;
+    }
+
     rangeset_domain_initialise(d);
     init_status |= INIT_rangeset;
 
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 1fab587..dc1ea06 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -183,10 +183,11 @@ void getdomaininfo(struct domain *d, struct 
xen_domctl_getdomaininfo *info)
     info->cpu_time = cpu_time;
 
     info->flags = (info->nr_online_vcpus ? flags : 0) |
-        ((d->is_dying == DOMDYING_dead) ? XEN_DOMINF_dying    : 0) |
-        (d->is_shut_down                ? XEN_DOMINF_shutdown : 0) |
-        (d->controller_pause_count > 0  ? XEN_DOMINF_paused   : 0) |
-        (d->debugger_attached           ? XEN_DOMINF_debugged : 0) |
+        ((d->is_dying == DOMDYING_dead) ? XEN_DOMINF_dying     : 0) |
+        (d->is_shut_down                ? XEN_DOMINF_shutdown  : 0) |
+        (d->controller_pause_count > 0  ? XEN_DOMINF_paused    : 0) |
+        (d->debugger_attached           ? XEN_DOMINF_debugged  : 0) |
+        (d->is_xenstore                 ? XEN_DOMINF_xs_domain : 0) |
         d->shutdown_code << XEN_DOMINF_shutdownshift;
 
     switch ( d->guest_type )
@@ -551,7 +552,8 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) 
u_domctl)
                | XEN_DOMCTL_CDF_pvh_guest
                | XEN_DOMCTL_CDF_hap
                | XEN_DOMCTL_CDF_s3_integrity
-               | XEN_DOMCTL_CDF_oos_off)) )
+               | XEN_DOMCTL_CDF_oos_off
+               | XEN_DOMCTL_CDF_xs_domain)) )
             break;
 
         dom = op->domain;
@@ -593,6 +595,8 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) 
u_domctl)
             domcr_flags |= DOMCRF_s3_integrity;
         if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_oos_off )
             domcr_flags |= DOMCRF_oos_off;
+        if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_xs_domain )
+            domcr_flags |= DOMCRF_xs_domain;
 
         d = domain_create(dom, domcr_flags, op->u.createdomain.ssidref,
                           &op->u.createdomain.config);
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 7a56b3f..2d8076c 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -63,6 +63,9 @@ struct xen_domctl_createdomain {
  /* Is this a PVH guest (as opposed to an HVM or PV guest)? */
 #define _XEN_DOMCTL_CDF_pvh_guest     4
 #define XEN_DOMCTL_CDF_pvh_guest      (1U<<_XEN_DOMCTL_CDF_pvh_guest)
+ /* Is this a xenstore domain? */
+#define _XEN_DOMCTL_CDF_xs_domain     5
+#define XEN_DOMCTL_CDF_xs_domain      (1U<<_XEN_DOMCTL_CDF_xs_domain)
     uint32_t flags;
     struct xen_arch_domainconfig config;
 };
@@ -97,6 +100,9 @@ struct xen_domctl_getdomaininfo {
 /* domain is PVH */
 #define _XEN_DOMINF_pvh_guest 7
 #define XEN_DOMINF_pvh_guest  (1U<<_XEN_DOMINF_pvh_guest)
+/* domain is a xenstore domain */
+#define _XEN_DOMINF_xs_domain 8
+#define XEN_DOMINF_xs_domain  (1U<<_XEN_DOMINF_xs_domain)
  /* XEN_DOMINF_shutdown guest-supplied code.  */
 #define XEN_DOMINF_shutdownmask 255
 #define XEN_DOMINF_shutdownshift 16
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index fc61fc3..c9a4fc0 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -374,6 +374,8 @@ struct domain
     bool_t           auto_node_affinity;
     /* Is this guest fully privileged (aka dom0)? */
     bool_t           is_privileged;
+    /* Is this a xenstore domain (not dom0)? */
+    bool_t           is_xenstore;
     /* Domain's VCPUs are pinned 1:1 to physical CPUs? */
     bool_t           is_pinned;
     /* Non-migratable and non-restoreable? */
@@ -533,6 +535,9 @@ struct domain *domain_create(domid_t domid, unsigned int 
domcr_flags,
  /* DOMCRF_pvh: Create PV domain in HVM container. */
 #define _DOMCRF_pvh             5
 #define DOMCRF_pvh              (1U<<_DOMCRF_pvh)
+ /* DOMCRF_xs_domain: xenstore domain */
+#define _DOMCRF_xs_domain       6
+#define DOMCRF_xs_domain        (1U<<_DOMCRF_xs_domain)
 
 /*
  * rcu_lock_domain_by_id() is more efficient than get_domain_by_id().
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index 81fba40..9803ff4 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -71,6 +71,10 @@ static always_inline int xsm_default_action(
         if ( src->is_privileged )
             return 0;
         return -EPERM;
+    case XSM_XS_PRIV:
+        if ( src->is_xenstore || src->is_privileged )
+            return 0;
+        return -EPERM;
     default:
         LINKER_BUG_ON(1);
         return -EPERM;
@@ -123,6 +127,8 @@ static XSM_INLINE int xsm_domctl(XSM_DEFAULT_ARG struct 
domain *d, int cmd)
     case XEN_DOMCTL_bind_pt_irq:
     case XEN_DOMCTL_unbind_pt_irq:
         return xsm_default_action(XSM_DM_PRIV, current->domain, d);
+    case XEN_DOMCTL_getdomaininfo:
+        return xsm_default_action(XSM_XS_PRIV, current->domain, d);
     default:
         return xsm_default_action(XSM_PRIV, current->domain, d);
     }
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index 3fc3824..150f94a 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -35,6 +35,7 @@ enum xsm_default {
     XSM_DM_PRIV,  /* Device model can perform on its target domain */
     XSM_TARGET,   /* Can perform on self or your target domain */
     XSM_PRIV,     /* Privileged - normally restricted to dom0 */
+    XSM_XS_PRIV,  /* Xenstore domain - can do some privileged operations */
     XSM_OTHER     /* Something more complex */
 };
 typedef enum xsm_default xsm_default_t;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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