[Xen-devel] [PATCH v4 4/6] libxc: introduce xc_domain_mem_map_policy

[Stefano Stabellini <sstabellini@kernel.org>]

Introduce a new libxc function that makes use of the new memory_policy
parameter added to the XEN_DOMCTL_memory_mapping hypercall.

The parameter values are the same for the XEN_DOMCTL_memory_mapping
hypercall (0 is MEMORY_POLICY_DEFAULT). Pass MEMORY_POLICY_DEFAULT by
default -- no changes in behavior.

We could extend xc_domain_memory_mapping, but QEMU makes use of it, so
it is easier and less disruptive to introduce a new libxc function and
change the implementation of xc_domain_memory_mapping to call into it.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
CC: ian.jackson@eu.citrix.com
CC: wei.liu2@citrix.com
---
Changes in v2:
- rename cache_policy to memory policy
- rename MEMORY_POLICY_DEVMEM to MEMORY_POLICY_ARM_DEV_nGRE
- rename MEMORY_POLICY_MEMORY to MEMORY_POLICY_ARM_MEM_WB
- introduce xc_domain_mem_map_policy
---
 tools/libxc/include/xenctrl.h |  8 ++++++++
 tools/libxc/xc_domain.c       | 25 ++++++++++++++++++++-----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 0ff6ed9e70..2396929960 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1714,6 +1714,14 @@ int xc_deassign_dt_device(xc_interface *xch,
                           uint32_t domid,
                           char *path);
 
+int xc_domain_mem_map_policy(xc_interface *xch,
+                             uint32_t domid,
+                             unsigned long first_gfn,
+                             unsigned long first_mfn,
+                             unsigned long nr_mfns,
+                             uint32_t add_mapping,
+                             uint32_t memory_policy);
+
 int xc_domain_memory_mapping(xc_interface *xch,
                              uint32_t domid,
                              unsigned long first_gfn,
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 075ffb9ed1..02f5778212 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -2042,13 +2042,14 @@ failed:
     return -1;
 }
 
-int xc_domain_memory_mapping(
+int xc_domain_mem_map_policy(
     xc_interface *xch,
     uint32_t domid,
     unsigned long first_gfn,
     unsigned long first_mfn,
     unsigned long nr_mfns,
-    uint32_t add_mapping)
+    uint32_t add_mapping,
+    uint32_t memory_policy)
 {
     DECLARE_DOMCTL;
     xc_dominfo_t info;
@@ -2070,7 +2071,7 @@ int xc_domain_memory_mapping(
     domctl.cmd = XEN_DOMCTL_memory_mapping;
     domctl.domain = domid;
     domctl.u.memory_mapping.add_mapping = add_mapping;
-    domctl.u.memory_mapping.memory_policy = MEMORY_POLICY_DEFAULT;
+    domctl.u.memory_mapping.memory_policy = memory_policy;
     max_batch_sz = nr_mfns;
     do
     {
@@ -2106,8 +2107,9 @@ int xc_domain_memory_mapping(
      * Errors here are ignored.
      */
     if ( ret && add_mapping != DPCI_REMOVE_MAPPING )
-        xc_domain_memory_mapping(xch, domid, first_gfn, first_mfn, nr_mfns,
-                                 DPCI_REMOVE_MAPPING);
+        xc_domain_mem_map_policy(xch, domid, first_gfn, first_mfn, nr_mfns,
+                                 DPCI_REMOVE_MAPPING,
+                                 MEMORY_POLICY_DEFAULT);
 
     /* We might get E2BIG so many times that we never advance. */
     if ( !done && !ret )
@@ -2116,6 +2118,19 @@ int xc_domain_memory_mapping(
     return ret;
 }
 
+int xc_domain_memory_mapping(
+    xc_interface *xch,
+    uint32_t domid,
+    unsigned long first_gfn,
+    unsigned long first_mfn,
+    unsigned long nr_mfns,
+    uint32_t add_mapping)
+{
+    return xc_domain_mem_map_policy(xch, domid, first_gfn, first_mfn,
+                                    nr_mfns, add_mapping,
+                                    MEMORY_POLICY_DEFAULT);
+}
+
 int xc_domain_ioport_mapping(
     xc_interface *xch,
     uint32_t domid,
-- 
2.17.1


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