[Xen-devel] [PATCH 5 of 5] mem_access: libxc changes for mem access

[Joe Epstein <jepstein@xxxxxxxxxxxxxxxxxxxx>]

libxc changes to allow getting and setting the memory access permissions

Signed-off-by: Joe Epstein <jepstein98@xxxxxxxxx>

diff -r 4e108cf56d07 tools/libxc/Makefile
--- a/tools/libxc/Makefile      Mon Dec 27 08:00:09 2010 +0000
+++ b/tools/libxc/Makefile      Tue Dec 28 22:31:15 2010 -0800
@@ -28,6 +28,7 @@
 CTRL_SRCS-y       += xc_tmem.c
 CTRL_SRCS-y       += xc_mem_event.c
 CTRL_SRCS-y       += xc_mem_paging.c
+CTRL_SRCS-y       += xc_mem_access.c
 CTRL_SRCS-y       += xc_memshr.c
 CTRL_SRCS-y       += xc_hcall_buf.c
 CTRL_SRCS-y       += xc_foreign_memory.c
diff -r 4e108cf56d07 tools/libxc/xc_misc.c
--- a/tools/libxc/xc_misc.c     Mon Dec 27 08:00:09 2010 +0000
+++ b/tools/libxc/xc_misc.c     Tue Dec 28 22:31:15 2010 -0800
@@ -511,6 +511,66 @@
     return rc;
 }

+int xc_hvm_set_mem_access(
+    xc_interface *xch, domid_t dom, hvmmem_access_t mem_access,
uint64_t first_pfn, uint64_t nr)
+{
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(struct xen_hvm_set_mem_access, arg);
+    int rc;
+
+    arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+    if ( arg == NULL )
+    {
+        PERROR("Could not allocate memory for xc_hvm_set_mem_access
hypercall");
+        return -1;
+    }
+
+    arg->domid         = dom;
+    arg->hvmmem_access = mem_access;
+    arg->first_pfn     = first_pfn;
+    arg->nr            = nr;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_set_mem_access;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    rc = do_xen_hypercall(xch, &hypercall);
+
+    xc_hypercall_buffer_free(xch, arg);
+
+    return rc;
+}
+
+int xc_hvm_get_mem_access(
+    xc_interface *xch, domid_t dom, uint64_t pfn, hvmmem_access_t* mem_access)
+{
+    DECLARE_HYPERCALL;
+    DECLARE_HYPERCALL_BUFFER(struct xen_hvm_get_mem_access, arg);
+    int rc;
+
+    arg = xc_hypercall_buffer_alloc(xch, arg, sizeof(*arg));
+    if ( arg == NULL )
+    {
+        PERROR("Could not allocate memory for xc_hvm_get_mem_access
hypercall");
+        return -1;
+    }
+
+    arg->domid       = dom;
+    arg->pfn         = pfn;
+
+    hypercall.op     = __HYPERVISOR_hvm_op;
+    hypercall.arg[0] = HVMOP_get_mem_access;
+    hypercall.arg[1] = HYPERCALL_BUFFER_AS_ARG(arg);
+
+    rc = do_xen_hypercall(xch, &hypercall);
+
+    if ( !rc )
+        *mem_access = arg->hvmmem_access;
+
+    xc_hypercall_buffer_free(xch, arg);
+
+    return rc;
+}

 /*
  * Local variables:
diff -r 4e108cf56d07 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h     Mon Dec 27 08:00:09 2010 +0000
+++ b/tools/libxc/xenctrl.h     Tue Dec 28 22:31:15 2010 -0800
@@ -1398,6 +1398,20 @@
 int xc_hvm_set_mem_type(
     xc_interface *xch, domid_t dom, hvmmem_type_t memtype, uint64_t
first_pfn, uint64_t nr);

+/*
+ * Set a range of memory to a specific access.
+ * Allowed types are HVMMEM_access_default, HVMMEM_access_n, any
combination of
+ * HVM_access_ + (rwx), and HVM_access_rx2rw
+ */
+int xc_hvm_set_mem_access(
+    xc_interface *xch, domid_t dom, hvmmem_access_t memaccess,
uint64_t first_pfn, uint64_t nr);
+
+/*
+ * Gets the mem access for the given page (returned in memacess on success)
+ */
+int xc_hvm_get_mem_access(
+    xc_interface *xch, domid_t dom, uint64_t pfn, hvmmem_access_t* memaccess);
+

 /*
  *  LOGGING AND ERROR REPORTING
@@ -1704,6 +1718,8 @@
 int xc_mem_paging_prep(xc_interface *xch, domid_t domain_id, unsigned
long gfn);
 int xc_mem_paging_resume(xc_interface *xch, domid_t domain_id,
                          unsigned long gfn);
+int xc_mem_access_resume(xc_interface *xch, domid_t domain_id,
+                         unsigned long gfn);

 /**
  * memshr operations

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