Il 16/12/2013 21:51, Matthew Rosato ha scritto: > Add the machine=...,standby-mem={size} option and associated > documentation.
See how Igor Mammedov's x86 memory hotplug instead added "-m NN,maxmem=NN". You could use these two patches: http://lists.gnu.org/archive/html/qemu-devel/2013-11/msg03438.html http://lists.gnu.org/archive/html/qemu-devel/2013-11/msg03439.html Paolo > Signed-off-by: Matthew Rosato <mjros...@linux.vnet.ibm.com> > --- > qemu-options.hx | 6 +++++- > vl.c | 6 ++++++ > 2 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/qemu-options.hx b/qemu-options.hx > index af34483..def4493 100644 > --- a/qemu-options.hx > +++ b/qemu-options.hx > @@ -35,7 +35,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \ > " kernel_irqchip=on|off controls accelerated irqchip > support\n" > " kvm_shadow_mem=size of KVM shadow MMU\n" > " dump-guest-core=on|off include guest memory in a core > dump (default=on)\n" > - " mem-merge=on|off controls memory merge support > (default: on)\n", > + " mem-merge=on|off controls memory merge support > (default: on)\n" > + " standby-mem=size sets size of additional offline > memory\n", > QEMU_ARCH_ALL) > STEXI > @item -machine [type=]@var{name}[,prop=@var{value}[,...]] > @@ -58,6 +59,9 @@ Include guest memory in a core dump. The default is on. > Enables or disables memory merge support. This feature, when supported by > the host, de-duplicates identical memory pages among VMs instances > (enabled by default). > +@item standby-mem=size > +Defines the size, in megabytes, of additional memory to be left offline for > +future hotplug by the guest. > @end table > ETEXI > > diff --git a/vl.c b/vl.c > index b0399de..7d58d24 100644 > --- a/vl.c > +++ b/vl.c > @@ -187,6 +187,7 @@ DisplayType display_type = DT_DEFAULT; > static int display_remote; > const char* keyboard_layout = NULL; > ram_addr_t ram_size; > +ram_addr_t standby_mem_size; > const char *mem_path = NULL; > int mem_prealloc = 0; /* force preallocation of physical target memory */ > int nb_nics; > @@ -430,6 +431,10 @@ static QemuOptsList qemu_machine_opts = { > .name = "firmware", > .type = QEMU_OPT_STRING, > .help = "firmware image", > + },{ > + .name = "standby-mem", > + .type = QEMU_OPT_SIZE, > + .help = "standby memory size", > }, > { /* End of list */ } > }, > @@ -2906,6 +2911,7 @@ int main(int argc, char **argv, char **envp) > machine = find_default_machine(); > cpu_model = NULL; > ram_size = 0; > + standby_mem_size = 0; > snapshot = 0; > cyls = heads = secs = 0; > translation = BIOS_ATA_TRANSLATION_AUTO; >