Re: [Qemu-devel] [PATCH v3 2/2] vl: convert -m to QemuOpts

["Andreas Färber" <afaerber@suse.de>]

Am 05.03.2014 17:10, schrieb Igor Mammedov:
> Adds option to -m
>  "size" - startup memory amount
> 
> For compatibility with legacy CLI if suffix-less number is passed,
> it assumes amount in Mb.
> 
> Otherwise user is free to use suffixed number using suffixes b,k/K,M,G
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> v2:
>  - suggested by Andreas Färber <afaerber@suse.de>
>     * s/fprintf/error_report/
>     * rename 'mem' option to 'size'
>  - fix conflict with missing numa QemuOpts
> ---
>  qemu-options.hx |    9 ++++--
>  vl.c            |   71 ++++++++++++++++++++++++++++++++++++++++++++-----------
>  2 files changed, 63 insertions(+), 17 deletions(-)
> 
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 56e5fdf..5e89e0d 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -210,10 +210,13 @@ use is discouraged as it may be removed from future versions.
>  ETEXI
>  
>  DEF("m", HAS_ARG, QEMU_OPTION_m,
> -    "-m megs         set virtual RAM size to megs MB [default="
> -    stringify(DEFAULT_RAM_SIZE) "]\n", QEMU_ARCH_ALL)
> +    "-m [size=]megs\n"
> +    "                configure guest RAM\n"
> +    "                size: initial amount of guest memory (default: "
> +    stringify(DEFAULT_RAM_SIZE) "MiB)\n",
> +    QEMU_ARCH_ALL)
>  STEXI
> -@item -m @var{megs}
> +@item -m [size=]@var{megs}
>  @findex -m
>  Set virtual RAM size to @var{megs} megabytes. Default is 128 MiB.  Optionally,
>  a suffix of ``M'' or ``G'' can be used to signify a value in megabytes or
> diff --git a/vl.c b/vl.c
> index 7eb3b73..72235c5 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -475,6 +475,20 @@ static QemuOptsList qemu_msg_opts = {
>      },
>  };
>  
> +static QemuOptsList qemu_mem_opts = {
> +    .name = "memory",
> +    .implied_opt_name = "mem",

"size"

> +    .head = QTAILQ_HEAD_INITIALIZER(qemu_mem_opts.head),
> +    .merge_lists = true,
> +    .desc = {
> +        {
> +            .name = "mem",

"size"

> +            .type = QEMU_OPT_SIZE,
> +        },
> +        { /* end of list */ }
> +    },
> +};
> +
>  /**
>   * Get machine options
>   *
> @@ -2835,6 +2849,8 @@ int main(int argc, char **argv, char **envp)
>      };
>      const char *trace_events = NULL;
>      const char *trace_file = NULL;
> +    const ram_addr_t default_ram_size = (ram_addr_t)DEFAULT_RAM_SIZE *
> +                                        1024 * 1024;
>  
>      atexit(qemu_run_exit_notifiers);
>      error_set_progname(argv[0]);
> @@ -2866,6 +2882,7 @@ int main(int argc, char **argv, char **envp)
>      qemu_add_opts(&qemu_trace_opts);
>      qemu_add_opts(&qemu_option_rom_opts);
>      qemu_add_opts(&qemu_machine_opts);
> +    qemu_add_opts(&qemu_mem_opts);
>      qemu_add_opts(&qemu_smp_opts);
>      qemu_add_opts(&qemu_boot_opts);
>      qemu_add_opts(&qemu_sandbox_opts);
> @@ -2889,7 +2906,7 @@ int main(int argc, char **argv, char **envp)
>      module_call_init(MODULE_INIT_MACHINE);
>      machine = find_default_machine();
>      cpu_model = NULL;
> -    ram_size = 0;
> +    ram_size = default_ram_size;
>      snapshot = 0;
>      cyls = heads = secs = 0;
>      translation = BIOS_ATA_TRANSLATION_AUTO;
> @@ -3176,20 +3193,48 @@ int main(int argc, char **argv, char **envp)
>                  exit(0);
>                  break;
>              case QEMU_OPTION_m: {
> -                int64_t value;
>                  uint64_t sz;
> -                char *end;
> +                const char *mem_str;
>  
> -                value = strtosz(optarg, &end);
> -                if (value < 0 || *end) {
> -                    fprintf(stderr, "qemu: invalid ram size: %s\n", optarg);
> -                    exit(1);
> +                opts = qemu_opts_parse(qemu_find_opts("memory"),
> +                                       optarg, 1);
> +                if (!opts) {
> +                    exit(EXIT_FAILURE);
> +                }
> +
> +                mem_str = qemu_opt_get(opts, "mem");

"size"

> +                if (!mem_str) {
> +                    error_report("invalid -m option, missing 'size' option");
> +                    exit(EXIT_FAILURE);
> +                }
> +                if (!*mem_str) {
> +                    error_report("missing 'size' option value");
> +                    exit(EXIT_FAILURE);
> +                }
> +
> +                sz = qemu_opt_get_size(opts, "mem", ram_size);

"size"

> +
> +                /* Fix up legacy suffix-less format */
> +                if (g_ascii_isdigit(mem_str[strlen(mem_str) - 1])) {
> +                    uint64_t overflow_check = sz;
> +
> +                    sz <<= 20;
> +                    if ((sz >> 20) != overflow_check) {
> +                        error_report("too large 'size' option value");
> +                        exit(EXIT_FAILURE);
> +                    }
> +                }
> +
> +                /* backward compatibility behaviour for case "-m 0" */
> +                if (sz == 0) {
> +                    sz = default_ram_size;
>                  }
> -                sz = QEMU_ALIGN_UP((uint64_t)value, 8192);
> +
> +                sz = QEMU_ALIGN_UP(sz, 8192);
>                  ram_size = sz;
>                  if (ram_size != sz) {
> -                    fprintf(stderr, "qemu: ram size too large\n");
> -                    exit(1);
> +                    error_report("ram size too large");
> +                    exit(EXIT_FAILURE);
>                  }
>                  break;
>              }
> @@ -4034,10 +4079,8 @@ int main(int argc, char **argv, char **envp)
>          exit(1);
>      }
>  
> -    /* init the memory */
> -    if (ram_size == 0) {
> -        ram_size = DEFAULT_RAM_SIZE * 1024 * 1024;
> -    }
> +    /* store value for the future use */
> +    qemu_opt_set_number(qemu_find_opts_singleton("memory"), "mem", ram_size);

"size"

>  
>      if (qemu_opts_foreach(qemu_find_opts("device"), device_help_func, NULL, 0)
>          != 0) {

Regards,
Andreas

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