[Xen-devel] [PATCH RFC 09/14] xen: vmx: Introduce a Hyper call to set subpage

[Zhang Yi <yi.z.zhang@xxxxxxxxxxxxxxx>]

From: Zhang Yi Z <yi.z.zhang@xxxxxxxxxxxxxxx>

The Hypercall is defined as HVMOP_set_subpage

And the Interface's parameters is defined as

struct xen_hvm_subpage {
    domid_t  domid;
    uint32_t access_map;
    uint64_t gfn;
}

The user application: xl, or some other security control daemon. will
set the protection bitmap via this hyper call.

Signed-off-by: Zhang Yi Z <yi.z.zhang@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c          | 8 ++++++++
 xen/include/public/hvm/hvm_op.h | 9 +++++++++
 2 files changed, 17 insertions(+)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 0b1aba7..54cd916 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4694,6 +4694,14 @@ long do_hvm_op(unsigned long op, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         rc = do_altp2m_op(arg);
         break;
 
+    case HVMOP_set_subpage: {
+        xen_hvm_subpage_t subpage;
+
+        if ( copy_from_guest(&subpage, arg, 1 ) )
+            return -EFAULT;
+        break;
+    }
+
     default:
     {
         gdprintk(XENLOG_DEBUG, "Bad HVM op %ld.\n", op);
diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h
index 0bdafdf..0fa5b88 100644
--- a/xen/include/public/hvm/hvm_op.h
+++ b/xen/include/public/hvm/hvm_op.h
@@ -205,6 +205,15 @@ struct xen_hvm_altp2m_domain_state {
 };
 typedef struct xen_hvm_altp2m_domain_state xen_hvm_altp2m_domain_state_t;
 DEFINE_XEN_GUEST_HANDLE(xen_hvm_altp2m_domain_state_t);
+#define HVMOP_set_subpage          26
+struct xen_hvm_subpage {
+    domid_t  domid;
+    uint32_t access_map;
+    uint64_t gfn;
+};
+typedef struct xen_hvm_subpage xen_hvm_subpage_t;
+DEFINE_XEN_GUEST_HANDLE(xen_hvm_subpage_t);
+
 
 struct xen_hvm_altp2m_vcpu_enable_notify {
     uint32_t vcpu_id;
-- 
2.7.4


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