[PATCH 2/7] libxc: Plumb Xen with vNUMA topology for domain.

[Elena Ufimtseva <ufimtseva@gmail.com>]

Per-domain vNUMA topology initialization.
domctl hypercall is used to set vNUMA topology
per domU during domain build time.

Signed-off-by: Elena Ufimtseva <ufimtseva@gmail.com>

---
Changes since RFC v2:
- copy vNUMA topology information in hypercall in one go;
---
 tools/libxc/xc_dom.h    |    9 ++++++++
 tools/libxc/xc_domain.c |   59 +++++++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h   |    9 ++++++++
 3 files changed, 77 insertions(+)

diff --git a/tools/libxc/xc_dom.h b/tools/libxc/xc_dom.h
index 86e23ee..a271b7c 100644
--- a/tools/libxc/xc_dom.h
+++ b/tools/libxc/xc_dom.h
@@ -114,6 +114,15 @@ struct xc_dom_image {
     struct xc_dom_phys *phys_pages;
     int realmodearea_log;
 
+    /*
+     * vNUMA topology and memory allocation structure.
+     * Defines the way to allocate memory on per NUMA
+     * physical nodes that is defined by vnode_to_pnode.
+     */
+    uint16_t nr_vnodes;
+    uint64_t *vnuma_memszs;
+    unsigned int *vnode_to_pnode;
+
     /* malloc memory pool */
     struct xc_dom_mem *memblocks;
 
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 2cea6e3..6cab681 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1777,6 +1777,65 @@ int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
     return do_domctl(xch, &domctl);
 }
 
+/* Plumbs Xen with vNUMA topology */
+int xc_domain_setvnodes(xc_interface *xch,
+                        uint32_t domid,
+                        uint16_t nr_vnodes,
+                        uint16_t nr_vcpus,
+                        vnuma_memblk_t *vmemblks,
+                        unsigned int *vdistance,
+                        unsigned int *vcpu_to_vnode,
+                        unsigned int *vnode_to_pnode)
+{
+    int rc;
+    DECLARE_DOMCTL;
+    DECLARE_HYPERCALL_BOUNCE(vmemblks, sizeof(*vmemblks) * nr_vnodes,
+                                    XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+    DECLARE_HYPERCALL_BOUNCE(vdistance, sizeof(*vdistance) *
+                                    nr_vnodes * nr_vnodes,
+                                    XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+    DECLARE_HYPERCALL_BOUNCE(vcpu_to_vnode, sizeof(*vcpu_to_vnode) * nr_vcpus,
+                                    XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+    DECLARE_HYPERCALL_BOUNCE(vnode_to_pnode, sizeof(*vnode_to_pnode) *
+                                    nr_vnodes,
+                                    XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+    
+    if ( vdistance == NULL || vcpu_to_vnode == NULL ||
+         vmemblks == NULL || vnode_to_pnode == NULL )
+    {
+            PERROR("Incorrect parameters for XEN_DOMCTL_setvnumainfo\n");
+            return -EINVAL;
+    }
+    
+    rc = -EINVAL;
+
+    if (xc_hypercall_bounce_pre(xch, vmemblks)      ||
+        xc_hypercall_bounce_pre(xch, vdistance)     ||
+        xc_hypercall_bounce_pre(xch, vcpu_to_vnode) ||
+        xc_hypercall_bounce_pre(xch, vnode_to_pnode))
+    {
+        PERROR("Could not bounce buffer for xc_domain_setvnodes");
+        return rc;
+    }
+    
+    set_xen_guest_handle(domctl.u.vnuma.vnuma_memblks, vmemblks);
+    set_xen_guest_handle(domctl.u.vnuma.vdistance, vdistance);
+    set_xen_guest_handle(domctl.u.vnuma.vcpu_to_vnode, vcpu_to_vnode);
+    set_xen_guest_handle(domctl.u.vnuma.vnode_to_pnode, vnode_to_pnode);
+    
+    domctl.cmd = XEN_DOMCTL_setvnumainfo;
+    domctl.domain = (domid_t)domid;
+    domctl.u.vnuma.nr_vnodes = nr_vnodes;
+    rc = do_domctl(xch, &domctl);
+    
+    xc_hypercall_bounce_post(xch, vmemblks);
+    xc_hypercall_bounce_post(xch, vdistance);
+    xc_hypercall_bounce_post(xch, vcpu_to_vnode);
+    xc_hypercall_bounce_post(xch, vnode_to_pnode);
+
+    return rc;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 8cf3f3b..3dbd035 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1108,6 +1108,15 @@ int xc_domain_set_memmap_limit(xc_interface *xch,
                                uint32_t domid,
                                unsigned long map_limitkb);
 
+int xc_domain_setvnodes(xc_interface *xch,
+                        uint32_t domid,
+                        uint16_t nr_vnodes,
+                        uint16_t nr_vcpus,
+                        vnuma_memblk_t *vmemareas,
+                        unsigned int *vdistance,
+                        unsigned int *vcpu_to_vnode,
+                        unsigned int *vnode_to_pnode);
+
 #if defined(__i386__) || defined(__x86_64__)
 /*
  * PC BIOS standard E820 types and structure.
-- 
1.7.10.4