[PATCH v6 07/16] xen: arm: implement XEN_DOMCTL_set_address_size

[Ian Campbell <ian.campbell@citrix.com>]

This is subarch specific to plumb through to arm32 and arm64 versions.

The toolstack uses this to select 32- vs 64-bit guests (or rather it does on
x86 and soon will for arm too).

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
---
v4: moved addition of xen/hypercall.h include into a precursor patch.
---
 xen/arch/arm/arm32/Makefile     |    1 +
 xen/arch/arm/arm32/domctl.c     |   35 +++++++++++++++++++++++
 xen/arch/arm/arm64/Makefile     |    1 +
 xen/arch/arm/arm64/domctl.c     |   59 +++++++++++++++++++++++++++++++++++++++
 xen/arch/arm/domctl.c           |    6 +++-
 xen/include/asm-arm/hypercall.h |    3 ++
 6 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 xen/arch/arm/arm32/domctl.c
 create mode 100644 xen/arch/arm/arm64/domctl.c

diff --git a/xen/arch/arm/arm32/Makefile b/xen/arch/arm/arm32/Makefile
index aacdcb9..65ecff4 100644
--- a/xen/arch/arm/arm32/Makefile
+++ b/xen/arch/arm/arm32/Makefile
@@ -7,5 +7,6 @@ obj-y += traps.o
 obj-y += domain.o
 obj-y += vfp.o
 obj-y += smpboot.o
+obj-y += domctl.o
 
 obj-$(EARLY_PRINTK) += debug.o
diff --git a/xen/arch/arm/arm32/domctl.c b/xen/arch/arm/arm32/domctl.c
new file mode 100644
index 0000000..c2ca4d3
--- /dev/null
+++ b/xen/arch/arm/arm32/domctl.c
@@ -0,0 +1,35 @@
+/******************************************************************************
+ * Subarch-specific domctl.c
+ *
+ * Copyright (c) 2013, Citrix Systems
+ */
+
+#include <xen/config.h>
+#include <xen/types.h>
+#include <xen/lib.h>
+#include <xen/errno.h>
+#include <xen/sched.h>
+#include <xen/hypercall.h>
+#include <public/domctl.h>
+
+long subarch_do_domctl(struct xen_domctl *domctl, struct domain *d,
+               XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
+{
+    switch ( domctl->cmd )
+    {
+    case XEN_DOMCTL_set_address_size:
+        return domctl->u.address_size.size == 32 ? 0 : -EINVAL;
+    default:
+        return -ENOSYS;
+    }
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/arm64/Makefile b/xen/arch/arm/arm64/Makefile
index 5d28bad..d2d5875 100644
--- a/xen/arch/arm/arm64/Makefile
+++ b/xen/arch/arm/arm64/Makefile
@@ -6,5 +6,6 @@ obj-y += traps.o
 obj-y += domain.o
 obj-y += vfp.o
 obj-y += smpboot.o
+obj-y += domctl.o
 
 obj-$(EARLY_PRINTK) += debug.o
diff --git a/xen/arch/arm/arm64/domctl.c b/xen/arch/arm/arm64/domctl.c
new file mode 100644
index 0000000..e2b4617
--- /dev/null
+++ b/xen/arch/arm/arm64/domctl.c
@@ -0,0 +1,59 @@
+/******************************************************************************
+ * Subarch-specific domctl.c
+ *
+ * Copyright (c) 2013, Citrix Systems
+ */
+
+#include <xen/config.h>
+#include <xen/types.h>
+#include <xen/lib.h>
+#include <xen/errno.h>
+#include <xen/sched.h>
+#include <xen/hypercall.h>
+#include <public/domctl.h>
+
+static long switch_mode(struct domain *d, enum domain_type type)
+{
+    if ( d == NULL )
+        return -EINVAL;
+    if ( d->tot_pages != 0 )
+        return -EBUSY;
+    if ( d->arch.type == type )
+        return 0;
+
+    d->arch.type = type;
+
+    return 0;
+}
+
+long subarch_do_domctl(struct xen_domctl *domctl, struct domain *d,
+                       XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
+{
+    switch ( domctl->cmd )
+    {
+    case XEN_DOMCTL_set_address_size:
+        switch ( domctl->u.address_size.size )
+        {
+        case 32:
+            return switch_mode(d, DOMAIN_PV32);
+        case 64:
+            return switch_mode(d, DOMAIN_PV64);
+        default:
+            return -EINVAL;
+        }
+        break;
+
+    default:
+        return -ENOSYS;
+    }
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/domctl.c b/xen/arch/arm/domctl.c
index 4cf0294..546e86b 100644
--- a/xen/arch/arm/domctl.c
+++ b/xen/arch/arm/domctl.c
@@ -15,7 +15,11 @@
 long arch_do_domctl(struct xen_domctl *domctl, struct domain *d,
                     XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
 {
-    return -ENOSYS;
+    switch ( domctl->cmd )
+    {
+    default:
+        return subarch_do_domctl(domctl, d, u_domctl);
+    }
 }
 
 void arch_get_info_guest(struct vcpu *v, vcpu_guest_context_u c)
diff --git a/xen/include/asm-arm/hypercall.h b/xen/include/asm-arm/hypercall.h
index 3327a96..94a92d4 100644
--- a/xen/include/asm-arm/hypercall.h
+++ b/xen/include/asm-arm/hypercall.h
@@ -6,6 +6,9 @@ int do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg);
 
 long do_arm_vcpu_op(int cmd, int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg);
 
+long subarch_do_domctl(struct xen_domctl *domctl, struct domain *d,
+                       XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl);
+
 #endif /* __ASM_ARM_HYPERCALL_H__ */
 /*
  * Local variables:
-- 
1.7.10.4