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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 04/13] Make MEM_ACCESS configurable
Select MEM_ACCESS_ALWAYS_ON on x86 to mark that MEM_ACCESS is not
configurable on x86. Avoid selecting it on ARM.
Rename HAS_MEM_ACCESS to MEM_ACCESS everywhere. Add a prompt and a
description to MEM_ACCESS in xen/common/Kconfig.
The result is that the user-visible option is MEM_ACCESS, and it is
configurable only on ARM (disabled by default). At the moment the
arch-specific mem_access code remains enabled on ARM, even with
MEM_ACCESS=y.
The purpose is to reduce code size. The option doesn't depend on EXPERT
because it would be nice to ecurity-support configurations without
MEM_ACCESS and a non-expert should be able to disable it.
Suggested-by: Julien Grall <julien.grall@xxxxxxx>
Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
CC: dgdegra@xxxxxxxxxxxxx
CC: andrew.cooper3@xxxxxxxxxx
CC: George.Dunlap@xxxxxxxxxxxxx
CC: ian.jackson@xxxxxxxxxxxxx
CC: jbeulich@xxxxxxxx
CC: julien.grall@xxxxxxx
CC: konrad.wilk@xxxxxxxxxx
CC: sstabellini@xxxxxxxxxx
CC: tim@xxxxxxx
CC: wei.liu2@xxxxxxxxxx
---
Changes in v5:
- change MEM_ACCESS_ALWAYS_ON to bool
- change default for MEM_ACCESS, default y if MEM_ACCESS_ALWAYS_ON
Changes in v4:
- remove HAS_MEM_ACCESS
- move MEM_ACCESS_ALWAYS_ON to common
- combile default and bool to def_bool
Changes in v3:
- keep HAS_MEM_ACCESS to mark that an arch can do MEM_ACCESS
- introduce MEM_ACCESS_ALWAYS_ON
- the main MEM_ACCESS option is in xen/common/Kconfig
Changes in v2:
- patch added
---
tools/firmware/xen-dir/shim.config | 2 +-
xen/arch/arm/Kconfig | 1 -
xen/arch/x86/Kconfig | 2 +-
xen/common/Kconfig | 10 +++++++++-
xen/common/Makefile | 2 +-
xen/common/domctl.c | 2 +-
xen/include/xen/mem_access.h | 4 ++--
xen/include/xsm/dummy.h | 2 +-
xen/include/xsm/xsm.h | 4 ++--
xen/xsm/dummy.c | 2 +-
xen/xsm/flask/hooks.c | 4 ++--
11 files changed, 21 insertions(+), 14 deletions(-)
diff --git a/tools/firmware/xen-dir/shim.config
b/tools/firmware/xen-dir/shim.config
index 4d5630f..21d7075 100644
--- a/tools/firmware/xen-dir/shim.config
+++ b/tools/firmware/xen-dir/shim.config
@@ -29,7 +29,7 @@ CONFIG_COMPAT=y
CONFIG_CORE_PARKING=y
CONFIG_HAS_ALTERNATIVE=y
CONFIG_HAS_EX_TABLE=y
-CONFIG_HAS_MEM_ACCESS=y
+CONFIG_MEM_ACCESS=y
CONFIG_HAS_MEM_PAGING=y
CONFIG_HAS_MEM_SHARING=y
CONFIG_HAS_PDX=y
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 66adce4..2b87111 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -17,7 +17,6 @@ config ARM
def_bool y
select HAS_ALTERNATIVE
select HAS_DEVICE_TREE
- select HAS_MEM_ACCESS
select HAS_PASSTHROUGH
select HAS_PDX
diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index f64fc56..9a85fe9 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -15,7 +15,7 @@ config X86
select HAS_GDBSX
select HAS_IOPORTS
select HAS_KEXEC
- select HAS_MEM_ACCESS
+ select MEM_ACCESS_ALWAYS_ON
select HAS_MEM_PAGING
select HAS_MEM_SHARING
select HAS_NS16550
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index 9043dce..db6bb2d 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -20,9 +20,17 @@ config HAS_DEVICE_TREE
config HAS_EX_TABLE
bool
-config HAS_MEM_ACCESS
+config MEM_ACCESS_ALWAYS_ON
bool
+config MEM_ACCESS
+ def_bool MEM_ACCESS_ALWAYS_ON
+ prompt "Memory Access and VM events" if !MEM_ACCESS_ALWAYS_ON
+ ---help---
+
+ Framework to configure memory access types for guests and receive
+ related events in userspace.
+
config HAS_MEM_PAGING
bool
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 24d4752..6f2b3fc 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -22,7 +22,7 @@ obj-y += lib.o
obj-$(CONFIG_NEEDS_LIST_SORT) += list_sort.o
obj-$(CONFIG_LIVEPATCH) += livepatch.o livepatch_elf.o
obj-y += lzo.o
-obj-$(CONFIG_HAS_MEM_ACCESS) += mem_access.o
+obj-$(CONFIG_MEM_ACCESS) += mem_access.o
obj-y += memory.o
obj-y += monitor.o
obj-y += multicall.o
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index 9b7bc08..891ad58 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -1085,7 +1085,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t)
u_domctl)
copyback = 1;
break;
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
case XEN_DOMCTL_set_access_required:
if ( unlikely(current->domain == d) ) /* no domain_pause() */
ret = -EPERM;
diff --git a/xen/include/xen/mem_access.h b/xen/include/xen/mem_access.h
index 5ab34c1..7e95eab 100644
--- a/xen/include/xen/mem_access.h
+++ b/xen/include/xen/mem_access.h
@@ -78,7 +78,7 @@ long p2m_set_mem_access_multi(struct domain *d,
*/
int p2m_get_mem_access(struct domain *d, gfn_t gfn, xenmem_access_t *access);
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
int mem_access_memop(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(xen_mem_access_op_t) arg);
#else
@@ -88,7 +88,7 @@ int mem_access_memop(unsigned long cmd,
{
return -ENOSYS;
}
-#endif /* CONFIG_HAS_MEM_ACCESS */
+#endif /* CONFIG_MEM_ACCESS */
#endif /* _XEN_MEM_ACCESS_H */
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index ff6b2db..b0ac1f6 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -584,7 +584,7 @@ static XSM_INLINE int xsm_vm_event_control(XSM_DEFAULT_ARG
struct domain *d, int
return xsm_default_action(action, current->domain, d);
}
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
static XSM_INLINE int xsm_mem_access(XSM_DEFAULT_ARG struct domain *d)
{
XSM_ASSERT_ACTION(XSM_DM_PRIV);
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index f0c6fc7..7636bcb 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -143,7 +143,7 @@ struct xsm_operations {
int (*vm_event_control) (struct domain *d, int mode, int op);
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
int (*mem_access) (struct domain *d);
#endif
@@ -582,7 +582,7 @@ static inline int xsm_vm_event_control (xsm_default_t def,
struct domain *d, int
return xsm_ops->vm_event_control(d, mode, op);
}
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
static inline int xsm_mem_access (xsm_default_t def, struct domain *d)
{
return xsm_ops->mem_access(d);
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index 6e75119..3290d04 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -127,7 +127,7 @@ void __init xsm_fixup_ops (struct xsm_operations *ops)
set_to_dummy_if_null(ops, vm_event_control);
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
set_to_dummy_if_null(ops, mem_access);
#endif
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 78bc326..7a3ccfa 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -1256,7 +1256,7 @@ static int flask_vm_event_control(struct domain *d, int
mode, int op)
return current_has_perm(d, SECCLASS_DOMAIN2, DOMAIN2__VM_EVENT);
}
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
static int flask_mem_access(struct domain *d)
{
return current_has_perm(d, SECCLASS_DOMAIN2, DOMAIN2__MEM_ACCESS);
@@ -1803,7 +1803,7 @@ static struct xsm_operations flask_ops = {
.vm_event_control = flask_vm_event_control,
-#ifdef CONFIG_HAS_MEM_ACCESS
+#ifdef CONFIG_MEM_ACCESS
.mem_access = flask_mem_access,
#endif
--
1.9.1
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