[PATCH v10 4/9] libxc: Introduce xc_domain_setvnuma to set vNUMA

[Elena Ufimtseva <ufimtseva@gmail.com>]

With the introduction of the XEN_DOMCTL_setvnumainfo
in patch titled: "xen: vnuma topology and subop hypercalls"
we put in the plumbing here to use from the toolstack. The user
is allowed to call this multiple times if they wish so.
It will error out if the nr_vnodes or nr_vcpus is zero.

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

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 tools/libxc/xc_domain.c |   68 +++++++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h   |   10 +++++++
 2 files changed, 78 insertions(+)

diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index c67ac9a..624a207 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -2124,6 +2124,74 @@ int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
     return do_domctl(xch, &domctl);
 }
 
+/* Plumbing Xen with vNUMA topology */
+int xc_domain_setvnuma(xc_interface *xch,
+                       uint32_t domid,
+                       uint32_t nr_vnodes,
+                       uint32_t nr_vmemranges,
+                       uint32_t nr_vcpus,
+                       vmemrange_t *vmemrange,
+                       unsigned int *vdistance,
+                       unsigned int *vcpu_to_vnode,
+                       unsigned int *vnode_to_pnode)
+{
+    int rc;
+    DECLARE_DOMCTL;
+    DECLARE_HYPERCALL_BOUNCE(vmemrange, sizeof(*vmemrange) * nr_vmemranges,
+                             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);
+    errno = EINVAL;
+
+    if ( nr_vnodes == 0 || nr_vmemranges == 0 ||
+         nr_vmemranges < nr_vnodes || nr_vcpus == 0 )
+        return -1;
+
+    if ( !vdistance || !vcpu_to_vnode || !vmemrange || !vnode_to_pnode )
+    {
+        PERROR("%s: Cant set vnuma without initializing topology", __func__);
+        return -1;
+    }
+
+    if ( xc_hypercall_bounce_pre(xch, vmemrange)      ||
+         xc_hypercall_bounce_pre(xch, vdistance)      ||
+         xc_hypercall_bounce_pre(xch, vcpu_to_vnode)  ||
+         xc_hypercall_bounce_pre(xch, vnode_to_pnode) )
+    {
+        rc = -1;
+        goto vnumaset_fail;
+
+    }
+
+    set_xen_guest_handle(domctl.u.vnuma.vmemrange, vmemrange);
+    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;
+    domctl.u.vnuma.nr_vmemranges = nr_vmemranges;
+    domctl.u.vnuma.nr_vcpus = nr_vcpus;
+    domctl.u.vnuma.pad = 0;
+
+    rc = do_domctl(xch, &domctl);
+
+ vnumaset_fail:
+    xc_hypercall_bounce_post(xch, vmemrange);
+    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 1c5d0db..1c8aa42 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1245,6 +1245,16 @@ int xc_domain_set_memmap_limit(xc_interface *xch,
                                uint32_t domid,
                                unsigned long map_limitkb);
 
+int xc_domain_setvnuma(xc_interface *xch,
+                        uint32_t domid,
+                        uint32_t nr_vnodes,
+                        uint32_t nr_regions,
+                        uint32_t nr_vcpus,
+                        vmemrange_t *vmemrange,
+                        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