Re: [Xen-devel] Re: [PATCH] libxl: initialize domid to 0 in libxl__create_stubdom

[ZhouPeng <zpengxen@xxxxxxxxx>]

Resend for a mistake.

I think 'domid' should be both an input and output parameter,
which allows caller/user to provide a given domid,
if the given domid <= 0, it meas to request the hypervisor
to assign the next free id.

so  "assert(!libxl_domid_valid_guest(*domid));" is necessary, but
should be "assert(libxl_domid_valid_guest(*domid));"
and '*domid = -1;' should be cut out in libxl__domain_make

If any mistake, pls fix me

My patch for this:
---
libxl: fix domid check err.
It should meet the XEN_DOMCTL_createdomain hypercall

Signed-off-by: Zhou Peng <zhoupeng@xxxxxxxxxxxxxxx>

diff -r eca057e4475c tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c        Fri Jun 17 08:08:13 2011 +0100
+++ b/tools/libxl/libxl_create.c        Tue Jun 21 11:02:51 2011 +0800
@@ -295,7 +295,8 @@ int libxl__domain_make(libxl__gc *gc, li
    xs_transaction_t t = 0;
    xen_domain_handle_t handle;

-    assert(!libxl_domid_valid_guest(*domid));
+    if (*domid > 0)
+        assert(libxl_domid_valid_guest(*domid));

    uuid_string = libxl__uuid2string(gc, info->uuid);
    if (!uuid_string) {
@@ -306,7 +307,8 @@ int libxl__domain_make(libxl__gc *gc, li
    flags = info->hvm ? XEN_DOMCTL_CDF_hvm_guest : 0;
    flags |= info->hap ? XEN_DOMCTL_CDF_hap : 0;
    flags |= info->oos ? 0 : XEN_DOMCTL_CDF_oos_off;
-    *domid = -1;
+    if (*domid < 0)
+        *domid = -1;

    /* Ultimately, handle is an array of 16 uint8_t, same as uuid */
    libxl_uuid_copy((libxl_uuid *)handle, &info->uuid);

-- 
Zhou Peng
Operating System Technology Group
Institute of Software, the Chinese Academy of Sciences (ISCAS)

libxl-fix-domid-check-err.diff
Description: Binary data

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