Re: [Qemu-devel] [PATCH 2.1 08/28] vl: convert -m to QemuOpts

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 05 Mar 2014 11:06:18 +0100
Andreas Färber <afaerber@suse.de> wrote:

> Am 04.03.2014 15:00, schrieb Paolo Bonzini:
> > From: Igor Mammedov <imammedo@redhat.com>
> > 
> > Adds option to -m
> >  "mem" - startup memory amount
> 
> Sorry for jumping in late, but assuming that -m is for "memory" already,
> wouldn't it make more sense to name it "size" instead of "mem"?
> 
> > 
> > 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>
> > ---
> >  qemu-options.hx |  9 +++++---
> >  vl.c            | 70 ++++++++++++++++++++++++++++++++++++++++++++++-----------
> >  2 files changed, 63 insertions(+), 16 deletions(-)
> > 
> > diff --git a/qemu-options.hx b/qemu-options.hx
> > index f948f28..98e78ca 100644
> > --- a/qemu-options.hx
> > +++ b/qemu-options.hx
> > @@ -214,10 +214,13 @@ 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 [mem=]megs\n"
> > +    "                configure guest RAM\n"
> > +    "                mem: initial amount of guest memory (default: "
> > +    stringify(DEFAULT_RAM_SIZE) "MiB)\n",
> > +    QEMU_ARCH_ALL)
> >  STEXI
> > -@item -m @var{megs}
> > +@item -m [mem=]@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 dafe6f6..ac5f425 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -478,6 +478,20 @@ static QemuOptsList qemu_msg_opts = {
> >      },
> >  };
> >  
> > +static QemuOptsList qemu_mem_opts = {
> > +    .name = "memory",
> > +    .implied_opt_name = "mem",
> > +    .head = QTAILQ_HEAD_INITIALIZER(qemu_mem_opts.head),
> > +    .merge_lists = true,
> > +    .desc = {
> > +        {
> > +            .name = "mem",
> > +            .type = QEMU_OPT_SIZE,
> > +        },
> > +        { /* end of list */ }
> > +    },
> > +};
> > +
> >  /**
> >   * Get machine options
> >   *
> > @@ -2718,6 +2732,7 @@ 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]);
> > @@ -2758,6 +2773,7 @@ int main(int argc, char **argv, char **envp)
> >      qemu_add_opts(&qemu_realtime_opts);
> >      qemu_add_opts(&qemu_msg_opts);
> >      qemu_add_opts(&qemu_numa_opts);
> > +    qemu_add_opts(&qemu_mem_opts);
> >  
> >      runstate_init();
> >  
> > @@ -2773,7 +2789,7 @@ 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;
> > @@ -3063,20 +3079,50 @@ 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");
> > +                if (!mem_str) {
> > +                    fprintf(stderr, "qemu: invalid -m option, missing "
> > +                            "'mem' option\n");
> 
> error_report(), in particular to fix "qemu: "
> 
> > +                    exit(EXIT_FAILURE);
> > +                }
> > +                if (!*mem_str) {
> > +                    fprintf(stderr, "qemu: missing 'mem' option value\n");
> 
> error_report()
> 
> > +                    exit(EXIT_FAILURE);
> > +                }
> > +
> > +                sz = qemu_opt_get_size(opts, "mem", ram_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) {
> > +                        fprintf(stderr, "qemu: too large 'mem' option "
> > +                                "value\n");
> 
> error_report()
> 
> > +                        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");
> 
> error_report() while at it?
> 
> > -                    exit(1);
> > +                    exit(EXIT_FAILURE);
> >                  }
> >                  break;
> >              }
> > @@ -3921,10 +3967,8 @@ 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);
> >  
> >      if (qemu_opts_foreach(qemu_find_opts("device"), device_help_func, NULL, 0)
> >          != 0) {
> 
> Here's a dependency on the preceding patch - other than that, these two
> could be applied independently of the rest via qemu-trivial?
I'll amend patch according to your notes and resubmit it with its only dependency
CCing trivial-patches this time.

> 
> Regards,
> Andreas
>