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[Xen-devel] [RFC PATCH V2 6/8] xen/vm_event: Decouple vm_event and mem_access.



The vm_event subsystem has been artifically tied to the presence of mem_access.
While mem_access does depend on vm_event, vm_event is an entirely independent
subsystem that can be used for arbitrary function-offloading to helper apps in
domains. This patch removes the dependency that mem_access needs to be supported
in order to enable vm_event.

Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>
---
 xen/common/Makefile        |  2 +-
 xen/include/xen/vm_event.h | 56 ----------------------------------------------
 xen/include/xsm/dummy.h    |  2 --
 xen/include/xsm/xsm.h      |  2 --
 xen/xsm/dummy.c            |  2 --
 xen/xsm/flask/hooks.c      | 32 +++++++++++---------------
 6 files changed, 14 insertions(+), 82 deletions(-)

diff --git a/xen/common/Makefile b/xen/common/Makefile
index f1b73a3..2ccf0bb 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -52,9 +52,9 @@ obj-y += tmem_xen.o
 obj-y += radix-tree.o
 obj-y += rbtree.o
 obj-y += lzo.o
+obj-y += vm_event.o
 obj-$(HAS_PDX) += pdx.o
 obj-$(HAS_MEM_ACCESS) += mem_access.o
-obj-$(HAS_MEM_ACCESS) += vm_event.o
 
 obj-bin-$(CONFIG_X86) += $(foreach n,decompress bunzip2 unxz unlzma unlzo 
unlz4 earlycpio,$(n).init.o)
 
diff --git a/xen/include/xen/vm_event.h b/xen/include/xen/vm_event.h
index 988ea42..477ef7e 100644
--- a/xen/include/xen/vm_event.h
+++ b/xen/include/xen/vm_event.h
@@ -26,8 +26,6 @@
 
 #include <xen/sched.h>
 
-#ifdef HAS_MEM_ACCESS
-
 /* Clean up on domain destruction */
 void vm_event_cleanup(struct domain *d);
 
@@ -76,60 +74,6 @@ int vm_event_domctl(struct domain *d, 
xen_domctl_vm_event_op_t *mec,
 void vm_event_vcpu_pause(struct vcpu *v);
 void vm_event_vcpu_unpause(struct vcpu *v);
 
-#else
-
-static inline void vm_event_cleanup(struct domain *d) {}
-
-static inline bool_t vm_event_check_ring(struct vm_event_domain *med)
-{
-    return 0;
-}
-
-static inline int vm_event_claim_slot(struct domain *d,
-                                        struct vm_event_domain *med)
-{
-    return -ENOSYS;
-}
-
-static inline int vm_event_claim_slot_nosleep(struct domain *d,
-                                        struct vm_event_domain *med)
-{
-    return -ENOSYS;
-}
-
-static inline
-void vm_event_cancel_slot(struct domain *d, struct vm_event_domain *med)
-{}
-
-static inline
-void vm_event_put_request(struct domain *d, struct vm_event_domain *med,
-                            vm_event_request_t *req)
-{}
-
-static inline
-int vm_event_get_response(struct domain *d, struct vm_event_domain *med,
-                           vm_event_response_t *rsp)
-{
-    return -ENOSYS;
-}
-
-static inline int do_vm_event_op(int op, uint32_t domain, void *arg)
-{
-    return -ENOSYS;
-}
-
-static inline
-int vm_event_domctl(struct domain *d, xen_domctl_vm_event_op_t *mec,
-                     XEN_GUEST_HANDLE_PARAM(void) u_domctl)
-{
-    return -ENOSYS;
-}
-
-static inline void vm_event_vcpu_pause(struct vcpu *v) {}
-static inline void vm_event_vcpu_unpause(struct vcpu *v) {}
-
-#endif /* HAS_MEM_ACCESS */
-
 #endif /* __VM_EVENT_H__ */
 
 
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index 4227093..50ee929 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -513,7 +513,6 @@ static XSM_INLINE int xsm_hvm_param_nested(XSM_DEFAULT_ARG 
struct domain *d)
     return xsm_default_action(action, current->domain, d);
 }
 
-#ifdef HAS_MEM_ACCESS
 static XSM_INLINE int xsm_vm_event_control(XSM_DEFAULT_ARG struct domain *d, 
int mode, int op)
 {
     XSM_ASSERT_ACTION(XSM_PRIV);
@@ -525,7 +524,6 @@ static XSM_INLINE int xsm_vm_event_op(XSM_DEFAULT_ARG 
struct domain *d, int op)
     XSM_ASSERT_ACTION(XSM_DM_PRIV);
     return xsm_default_action(action, current->domain, d);
 }
-#endif
 
 #ifdef CONFIG_X86
 static XSM_INLINE int xsm_do_mca(XSM_DEFAULT_VOID)
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index cff9d35..61c5acc 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -141,10 +141,8 @@ struct xsm_operations {
     int (*hvm_param_nested) (struct domain *d);
     int (*get_vnumainfo) (struct domain *d);
 
-#ifdef HAS_MEM_ACCESS
     int (*vm_event_control) (struct domain *d, int mode, int op);
     int (*vm_event_op) (struct domain *d, int op);
-#endif
 
 #ifdef CONFIG_X86
     int (*do_mca) (void);
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index 25fca68..6d12d32 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -118,10 +118,8 @@ void xsm_fixup_ops (struct xsm_operations *ops)
     set_to_dummy_if_null(ops, remove_from_physmap);
     set_to_dummy_if_null(ops, map_gmfn_foreign);
 
-#ifdef HAS_MEM_ACCESS
     set_to_dummy_if_null(ops, vm_event_control);
     set_to_dummy_if_null(ops, vm_event_op);
-#endif
 
 #ifdef CONFIG_X86
     set_to_dummy_if_null(ops, do_mca);
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index c419543..5008b79 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -577,9 +577,7 @@ static int flask_domctl(struct domain *d, int cmd)
     case XEN_DOMCTL_iomem_permission:
     case XEN_DOMCTL_memory_mapping:
     case XEN_DOMCTL_set_target:
-#ifdef HAS_MEM_ACCESS
     case XEN_DOMCTL_vm_event_op:
-#endif
 #ifdef CONFIG_X86
     /* These have individual XSM hooks (arch/x86/domctl.c) */
     case XEN_DOMCTL_shadow_op:
@@ -1136,6 +1134,16 @@ static int flask_hvm_param_nested(struct domain *d)
     return current_has_perm(d, SECCLASS_HVM, HVM__NESTED);
 }
 
+static int flask_vm_event_control(struct domain *d, int mode, int op)
+{
+    return current_has_perm(d, SECCLASS_HVM, HVM__VM_EVENT);
+}
+
+static int flask_vm_event_op(struct domain *d, int op)
+{
+    return current_has_perm(d, SECCLASS_HVM, HVM__VM_EVENT);
+}
+
 #if defined(HAS_PASSTHROUGH) && defined(HAS_PCI)
 static int flask_get_device_group(uint32_t machine_bdf)
 {
@@ -1202,18 +1210,6 @@ static int flask_deassign_device(struct domain *d, 
uint32_t machine_bdf)
 }
 #endif /* HAS_PASSTHROUGH && HAS_PCI */
 
-#ifdef HAS_MEM_ACCESS
-static int flask_vm_event_control(struct domain *d, int mode, int op)
-{
-    return current_has_perm(d, SECCLASS_HVM, HVM__VM_EVENT);
-}
-
-static int flask_vm_event_op(struct domain *d, int op)
-{
-    return current_has_perm(d, SECCLASS_HVM, HVM__VM_EVENT);
-}
-#endif /* HAS_MEM_ACCESS */
-
 #ifdef CONFIG_X86
 static int flask_do_mca(void)
 {
@@ -1581,6 +1577,9 @@ static struct xsm_operations flask_ops = {
     .do_xsm_op = do_flask_op,
     .get_vnumainfo = flask_get_vnumainfo,
 
+    .vm_event_control = flask_vm_event_control,
+    .vm_event_op = flask_vm_event_op,
+
 #ifdef CONFIG_COMPAT
     .do_compat_op = compat_flask_op,
 #endif
@@ -1596,11 +1595,6 @@ static struct xsm_operations flask_ops = {
     .deassign_device = flask_deassign_device,
 #endif
 
-#ifdef HAS_MEM_ACCESS
-    .vm_event_control = flask_vm_event_control,
-    .vm_event_op = flask_vm_event_op,
-#endif
-
 #ifdef CONFIG_X86
     .do_mca = flask_do_mca,
     .shadow_control = flask_shadow_control,
-- 
2.1.4


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