[Xen-devel] [PATCH v6 10/15] xen/arm: support VCPUOP_register_vcpu_info.

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

We don't want to support the full vcpu_op hypercall interface, just
VCPUOP_register_vcpu_info: introduce an internal ARM-only
do_arm_vcpu_op function to filter out the vcpu_op hypercalls that
we don't want to support.
Call do_arm_vcpu_op instead of do_vcpu_op from traps.c.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
CC: keir@xxxxxxx
CC: JBeulich@xxxxxxxx

Changes in v4:
- introduce an HYPERCALL_ARM macro and use it for do_arm_vcpu_op.

Changes in v3:
- do not export all the vcpu_op hypercalls to ARM guests, only
VCPUOP_register_vcpu_info.
---
 xen/arch/arm/domain.c           |   13 +++++++++++++
 xen/arch/arm/traps.c            |    6 ++++++
 xen/include/asm-arm/hypercall.h |    2 ++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 2af40a1..15dde1a 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -10,6 +10,7 @@
  * GNU General Public License for more details.
  */
 #include <xen/config.h>
+#include <xen/hypercall.h>
 #include <xen/init.h>
 #include <xen/lib.h>
 #include <xen/sched.h>
@@ -628,6 +629,18 @@ void arch_dump_domain_info(struct domain *d)
     }
 }
 
+
+long do_arm_vcpu_op(int cmd, int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg)
+{
+    switch ( cmd )
+    {
+        case VCPUOP_register_vcpu_info:
+            return do_vcpu_op(cmd, vcpuid, arg);
+        default:
+            return -EINVAL;
+    }
+}
+
 long arch_do_vcpu_op(int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg)
 {
     return -ENOSYS;
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index c743f2c..83a7fbc 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -653,6 +653,11 @@ typedef struct {
         .nr_args = _nr_args,                                         \
     }
 
+#define HYPERCALL_ARM(_name, _nr_args)                        \
+    [ __HYPERVISOR_ ## _name ] =  {                                  \
+        .fn = (arm_hypercall_fn_t) &do_arm_ ## _name,                \
+        .nr_args = _nr_args,                                         \
+    }
 static arm_hypercall_t arm_hypercall_table[] = {
     HYPERCALL(memory_op, 2),
     HYPERCALL(domctl, 1),
@@ -665,6 +670,7 @@ static arm_hypercall_t arm_hypercall_table[] = {
     HYPERCALL(sysctl, 2),
     HYPERCALL(hvm_op, 2),
     HYPERCALL(grant_table_op, 3),
+    HYPERCALL_ARM(vcpu_op, 3),
 };
 
 #define __PSCI_cpu_suspend 0
diff --git a/xen/include/asm-arm/hypercall.h b/xen/include/asm-arm/hypercall.h
index 0833ec4..3327a96 100644
--- a/xen/include/asm-arm/hypercall.h
+++ b/xen/include/asm-arm/hypercall.h
@@ -4,6 +4,8 @@
 #include <public/domctl.h> /* for arch_do_domctl */
 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);
+
 #endif /* __ASM_ARM_HYPERCALL_H__ */
 /*
  * Local variables:
-- 
1.7.2.5


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