[Xen-changelog] [xen staging] tools: Pass max_vcpus to XEN_DOMCTL_createdomain

[patchbot@xxxxxxx]

commit 4737fa52ce868b51a97bd4f6ee932e040cb103bf
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Feb 27 17:39:37 2018 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Aug 31 12:06:53 2018 +0100

    tools: Pass max_vcpus to XEN_DOMCTL_createdomain
    
    XEN_DOMCTL_max_vcpus is a mandatory hypercall, but nothing actually 
prevents a
    toolstack from unpausing a domain with no vcpus.
    
    Originally, d->vcpus[] was an embedded array in struct domain, but c/s
    fb442e217 "x86_64: allow more vCPU-s per guest" in Xen 4.0 altered it to 
being
    dynamically allocated.  A side effect of this is that d->vcpu[] is NULL 
until
    XEN_DOMCTL_max_vcpus has completed, but a lot of hypercalls blindly
    dereference it.
    
    Even today, the behaviour of XEN_DOMCTL_max_vcpus is a mandatory singleton
    call which can't change the number of vcpus once a value has been chosen.
    
    In preparation to remote the hypercall, extend xen_domctl_createdomain with
    the a max_vcpus field and arrange for all callers to pass the appropriate
    value.  There is no change in construction behaviour yet, but later patches
    will rearrange the hypervisor internals.
    
    For the python stubs, extend the domain_create keyword list to take a
    max_vcpus parameter, in lieu of deleting the pyxc_domain_max_vcpus function.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
    Acked-by: Christian Lindig <christian.lindig@xxxxxxxxxx>
    Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/helpers/init-xenstore-domain.c |  3 ++-
 tools/libxl/libxl_create.c           |  1 +
 tools/ocaml/libs/xc/xenctrl.ml       |  1 +
 tools/ocaml/libs/xc/xenctrl.mli      |  1 +
 tools/ocaml/libs/xc/xenctrl_stubs.c  | 11 +++++++----
 tools/python/xen/lowlevel/xc/xc.c    |  9 ++++++---
 xen/include/public/domctl.h          |  1 +
 7 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/tools/helpers/init-xenstore-domain.c 
b/tools/helpers/init-xenstore-domain.c
index 47717508a2..3236d14416 100644
--- a/tools/helpers/init-xenstore-domain.c
+++ b/tools/helpers/init-xenstore-domain.c
@@ -66,6 +66,7 @@ static int build(xc_interface *xch)
     struct xen_domctl_createdomain config = {
         .ssidref = SECINITSID_DOMU,
         .flags = XEN_DOMCTL_CDF_xs_domain,
+        .max_vcpus = 1,
         .max_evtchn_port = -1, /* No limit. */
 
         /*
@@ -100,7 +101,7 @@ static int build(xc_interface *xch)
         fprintf(stderr, "xc_domain_create failed\n");
         goto err;
     }
-    rv = xc_domain_max_vcpus(xch, domid, 1);
+    rv = xc_domain_max_vcpus(xch, domid, config.max_vcpus);
     if ( rv )
     {
         fprintf(stderr, "xc_domain_max_vcpus failed\n");
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 8b755e412d..60676304e9 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -566,6 +566,7 @@ int libxl__domain_make(libxl__gc *gc, libxl_domain_config 
*d_config,
     if (!libxl_domid_valid_guest(*domid)) {
         struct xen_domctl_createdomain create = {
             .ssidref = info->ssidref,
+            .max_vcpus = b_info->max_vcpus,
             .max_evtchn_port = b_info->event_channels,
             .max_grant_frames = b_info->max_grant_frames,
             .max_maptrack_frames = b_info->max_maptrack_frames,
diff --git a/tools/ocaml/libs/xc/xenctrl.ml b/tools/ocaml/libs/xc/xenctrl.ml
index 42f45c4b67..40fbd3790f 100644
--- a/tools/ocaml/libs/xc/xenctrl.ml
+++ b/tools/ocaml/libs/xc/xenctrl.ml
@@ -63,6 +63,7 @@ type domctl_create_config =
        ssidref: int32;
        handle: string;
        flags: domain_create_flag list;
+       max_vcpus: int;
        max_evtchn_port: int;
        max_grant_frames: int;
        max_maptrack_frames: int;
diff --git a/tools/ocaml/libs/xc/xenctrl.mli b/tools/ocaml/libs/xc/xenctrl.mli
index 0db58162d0..906ce9486b 100644
--- a/tools/ocaml/libs/xc/xenctrl.mli
+++ b/tools/ocaml/libs/xc/xenctrl.mli
@@ -55,6 +55,7 @@ type domctl_create_config = {
   ssidref: int32;
   handle: string;
   flags: domain_create_flag list;
+  max_vcpus: int;
   max_evtchn_port: int;
   max_grant_frames: int;
   max_maptrack_frames: int;
diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c 
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index 1b5abd9f3a..578a014eac 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -128,15 +128,17 @@ CAMLprim value stub_xc_domain_create(value xch, value 
config)
 #define VAL_SSIDREF             Field(config, 0)
 #define VAL_HANDLE              Field(config, 1)
 #define VAL_FLAGS               Field(config, 2)
-#define VAL_MAX_EVTCHN_PORT     Field(config, 3)
-#define VAL_MAX_GRANT_FRAMES    Field(config, 4)
-#define VAL_MAX_MAPTRACK_FRAMES Field(config, 5)
-#define VAL_ARCH                Field(config, 6)
+#define VAL_MAX_VCPUS           Field(config, 3)
+#define VAL_MAX_EVTCHN_PORT     Field(config, 4)
+#define VAL_MAX_GRANT_FRAMES    Field(config, 5)
+#define VAL_MAX_MAPTRACK_FRAMES Field(config, 6)
+#define VAL_ARCH                Field(config, 7)
 
        uint32_t domid = 0;
        int result;
        struct xen_domctl_createdomain cfg = {
                .ssidref = Int32_val(VAL_SSIDREF),
+               .max_vcpus = Int_val(VAL_MAX_VCPUS),
                .max_evtchn_port = Int_val(VAL_MAX_EVTCHN_PORT),
                .max_grant_frames = Int_val(VAL_MAX_GRANT_FRAMES),
                .max_maptrack_frames = Int_val(VAL_MAX_MAPTRACK_FRAMES),
@@ -178,6 +180,7 @@ CAMLprim value stub_xc_domain_create(value xch, value 
config)
 #undef VAL_MAX_MAPTRACK_FRAMES
 #undef VAL_MAX_GRANT_FRAMES
 #undef VAL_MAX_EVTCHN_PORT
+#undef VAL_MAX_VCPUS
 #undef VAL_FLAGS
 #undef VAL_HANDLE
 #undef VAL_SSIDREF
diff --git a/tools/python/xen/lowlevel/xc/xc.c 
b/tools/python/xen/lowlevel/xc/xc.c
index 6bd58ecbcd..b137d5a839 100644
--- a/tools/python/xen/lowlevel/xc/xc.c
+++ b/tools/python/xen/lowlevel/xc/xc.c
@@ -125,16 +125,19 @@ static PyObject *pyxc_domain_create(XcObject *self,
             0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
             0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
         },
+        .max_vcpus = 1,
         .max_evtchn_port = -1, /* No limit. */
         .max_grant_frames = 32,
         .max_maptrack_frames = 1024,
     };
 
-    static char *kwd_list[] = { "domid", "ssidref", "handle", "flags", 
"target", NULL };
+    static char *kwd_list[] = { "domid", "ssidref", "handle", "flags",
+                                "target", "max_vcpus", NULL };
 
-    if ( !PyArg_ParseTupleAndKeywords(args, kwds, "|iiOii", kwd_list,
+    if ( !PyArg_ParseTupleAndKeywords(args, kwds, "|iiOiii", kwd_list,
                                       &dom, &config.ssidref, &pyhandle,
-                                      &config.flags, &target))
+                                      &config.flags, &target,
+                                      &config.max_vcpus) )
         return NULL;
     if ( pyhandle != NULL )
     {
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 2b496d4e31..512e21d1b8 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -70,6 +70,7 @@ struct xen_domctl_createdomain {
      * Various domain limits, which impact the quantity of resources (global
      * mapping space, xenheap, etc) a guest may consume.
      */
+    uint32_t max_vcpus;
     uint32_t max_evtchn_port;
     uint32_t max_grant_frames;
     uint32_t max_maptrack_frames;
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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