Re: [Qemu-devel] [PATCH v10 13/13] dump: add 'query-dump-guest-memory-capability' command

[Luiz Capitulino <lcapitulino@redhat.com>]

On Wed, 12 Feb 2014 14:34:19 +0800
Qiao Nuohan <qiaonuohan@cn.fujitsu.com> wrote:

> 'query-dump-guest-memory-capability' is used to query the available formats for
> 'dump-guest-memory'. The output of the command will be like:
> 
> -> { "execute": "query-dump-guest-memory-capability" }
> <- { "return": { "formats":
>                      ["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }
> 
> Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>

The new command looks good to me, but the patch itself is broken. It doesn't
apply and I could identify at least one breakage below...

> ---
>   dump.c           |   33 +++++++++++++++++++++++++++++++++
>   qapi-schema.json |   23 +++++++++++++++++++++++
>   qmp-commands.hx  |   20 ++++++++++++++++++++
>   3 files changed, 76 insertions(+), 0 deletions(-)
> 
> diff --git a/dump.c b/dump.c
> index 2ebbb23..3a8d55e 100644
> --- a/dump.c
> +++ b/dump.c
> @@ -1788,3 +1788,36 @@ void qmp_dump_guest_memory(bool paging, const char *file, 
> bool has_begin,
> 
>       g_free(s);
>   }
> +
> +DumpGuestMemoryCapability *qmp_query_dump_guest_memory_capability(Error **errp)
> +{
> +    DumpGuestMemoryFormatList *item;
> +    DumpGuestMemoryCapability *cap =
> +                                  g_malloc0(sizeof(DumpGuestMemoryCapability));
> +
> +    /* elf is always available */
> +    item = g_malloc0(sizeof(DumpGuestMemoryFormatList));
> +    cap->formats = item;
> +    item->value = DUMP_GUEST_MEMORY_FORMAT_ELF;
> +
> +    /* kdump-zlib is always available */
> +    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
> +    item = item->next;
> +    item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_ZLIB;
> +
> +    /* add new item if kdump-lzo is available */
> +#ifdef CONFIG_LZO
> +    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
> +    item = item->next;
> +    item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO;
> +#endif
> +
> +    /* add new item if kdump-snappy is available */
> +#ifdef CONFIG_SNAPPY
> +    item->next = g_malloc0(sizeof(DumpGuestMemoryFormatList));
> +    item = item->next;
> +    item->value = DUMP_GUEST_MEMORY_FORMAT_KDUMP_SNAPPY;
> +#endif
> +
> +    return cap;
> +}
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 7f62007..a097e6c 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -2783,6 +2783,29 @@
>               '*length': 'int', '*format': 'DumpGuestMemoryFormat' } }
> 
>   ##
> +# @DumpGuestMemoryCapability:
> +#
> +# A list of the available formats for dump-guest-memory
> +#
> +# Since: 2.0
> +##
> +{ 'type': 'DumpGuestMemoryCapability',
> +  'data': {
> +      'formats': ['DumpGuestMemoryFormat'] } }
> +
> +##
> +# @query-dump-guest-memory-capability:
> +#
> +# Returns the available formats for dump-guest-memory
> +#
> +# Returns:  A @DumpGuestMemoryCapability object listing available formats for
> +#           dump-guest-memory
> +#
> +# Since: 2.0
> +##
> +{ 'command': 'query-dump-guest-memory-capability', 'returns': 
> 'DumpGuestMemoryCapability' }

Here.

> +
> +##
>   # @netdev_add:
>   #
>   # Add a network backend.
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index 019dde6..029cb3d 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -829,6 +829,26 @@ Notes:
>   EQMP
> 
>       {
> +        .name       = "query-dump-guest-memory-capability",
> +        .args_type  = "",
> +        .mhandler.cmd_new = qmp_marshal_input_query_dump_guest_memory_capability,
> +    },
> +
> +SQMP
> +query-dump-guest-memory-capability
> +----------
> +
> +Show available formats for 'dump-guest-memory'
> +
> +Example:
> +
> +-> { "execute": "query-dump-guest-memory-capability" }
> +<- { "return": { "formats":
> +                    ["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }
> +
> +EQMP
> +
> +    {
>           .name       = "netdev_add",
>           .args_type  = "netdev:O",
>           .mhandler.cmd_new = qmp_netdev_add,