[PATCH v2 02/25] arm/altp2m: Add HVMOP_altp2m_get_domain_state.

[Sergej Proskurin <proskurin@sec.in.tum.de>]

This commit adopts the x86 HVMOP_altp2m_get_domain_state implementation.

Signed-off-by: Sergej Proskurin <proskurin@sec.in.tum.de>
---
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Julien Grall <julien.grall@arm.com>
---
 xen/arch/arm/hvm.c           | 9 ++++++++-
 xen/include/asm-arm/altp2m.h | 2 ++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/hvm.c b/xen/arch/arm/hvm.c
index eb524ae..01a3243 100644
--- a/xen/arch/arm/hvm.c
+++ b/xen/arch/arm/hvm.c
@@ -69,7 +69,14 @@ static int do_altp2m_op(XEN_GUEST_HANDLE_PARAM(void) arg)
     switch ( a.cmd )
     {
     case HVMOP_altp2m_get_domain_state:
-        rc = -EOPNOTSUPP;
+        if ( !altp2m_enabled(d) )
+        {
+            rc = -EINVAL;
+            break;
+        }
+
+        a.u.domain_state.state = altp2m_active(d);
+        rc = __copy_to_guest(arg, &a, 1) ? -EFAULT : 0;
         break;
 
     case HVMOP_altp2m_set_domain_state:
diff --git a/xen/include/asm-arm/altp2m.h b/xen/include/asm-arm/altp2m.h
index 0711796..d47b249 100644
--- a/xen/include/asm-arm/altp2m.h
+++ b/xen/include/asm-arm/altp2m.h
@@ -22,6 +22,8 @@
 
 #include <xen/sched.h>
 
+#define altp2m_enabled(d) ((d)->arch.hvm_domain.params[HVM_PARAM_ALTP2M])
+
 /* Alternate p2m on/off per domain */
 static inline bool_t altp2m_active(const struct domain *d)
 {
-- 
2.9.0


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