Re: [libvirt] [PATCH 2/2] libxl: fix dom0 maximum memory setting

[Jim Fehlig]

Joao Martins wrote:
> On 02/08/2017 04:06 PM, Jim Fehlig wrote:
>> Joao Martins wrote:
>>> On 02/02/2017 10:31 PM, Jim Fehlig wrote:
 When the libxl driver is initialized, it creates a virDomainDef
 object for dom0 and adds it to the list of domains. Total memory
 for dom0 was being set from the max_memkb field of libxl_dominfo
 struct retrieved from libxl, but this field can be set to
 LIBXL_MEMKB_DEFAULT (~0ULL) if dom0 maximum memory has not been
 explicitly set by the user.

 This patch adds some simple parsing of the Xen commandline,
 looking for a dom0_mem parameter that also specifies a 'max' value.
 If not specified, dom0 maximum memory is effectively all physical
 host memory.

 Signed-off-by: Jim Fehlig 
 ---
  src/libxl/libxl_conf.c   | 75 
 
  src/libxl/libxl_conf.h   |  3 ++
  src/libxl/libxl_driver.c |  2 +-
  3 files changed, 79 insertions(+), 1 deletion(-)

 diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
 index b5186f2..bfe0e92 100644
 --- a/src/libxl/libxl_conf.c
 +++ b/src/libxl/libxl_conf.c
 @@ -34,6 +34,7 @@
  #include "internal.h"
  #include "virlog.h"
  #include "virerror.h"
 +#include "c-ctype.h"
  #include "datatypes.h"
  #include "virconf.h"
  #include "virfile.h"
 @@ -1530,6 +1531,80 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr 
 cfg,
  
  }
  
 +/*
 + * dom0's maximum memory can be controled by the user with the 'dom0_mem' 
 Xen
 + * command line parameter. E.g. to set dom0's initial memory to 4G and max
 + * memory to 8G: dom0_mem=4G,max:8G
 + *
 + * If not constrained by the user, dom0 can effectively use all host 
 memory.
 + * This function returns the configured maximum memory for dom0 in 
 kilobytes,
 + * either the user-specified value or total physical memory as a default.
 + */
 +unsigned long long
 +libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg)
 +{
 +char **cmd_tokens = NULL;
 +char **mem_tokens = NULL;
 +size_t i;
 +size_t j;
 +unsigned long long ret;
 +libxl_physinfo physinfo;
 +
 +if (cfg->verInfo->commandline == NULL ||
 +!(cmd_tokens = virStringSplit(cfg->verInfo->commandline, " ", 0)))
 +goto physmem;
 +
 +for (i = 0; cmd_tokens[i] != NULL; i++) {
 +if (!STRPREFIX(cmd_tokens[i], "dom0_mem="))
 +continue;
 +
 +if (!(mem_tokens = virStringSplit(cmd_tokens[i], ",", 0)))
 +break;
 +for (j = 0; mem_tokens[j] != NULL; j++) {
 +if (STRPREFIX(mem_tokens[j], "max:")) {
 +char *p = mem_tokens[j] + 4;
 +unsigned long long multiplier = 1;
 +
 +while (c_isdigit(*p))
 +p++;
 +if (virStrToLong_ull(mem_tokens[j] + 4, , 10, ) < 0)
 +break;
 +if (*p) {
 +switch (*p) {
 +case 'k':
 +case 'K':
 +multiplier = 1024;
 +break;
 +case 'm':
 +case 'M':
 +multiplier = 1024 * 1024;
 +break;
 +case 'g':
 +case 'G':
 +multiplier = 1024 * 1024 * 1024;
 +break;
 +}
 +}
 +ret = (ret * multiplier) / 1024;
 +goto cleanup;
 +}
 +}
 +}
 +
 + physmem:
 +/* No 'max' specified in dom0_mem, so dom0 can use all physical 
 memory */
 +libxl_physinfo_init();
 +libxl_get_physinfo(cfg->ctx, );
>>> Despite being an unlikely event, libxl_get_physinfo can fail here - I think 
>>> you
>>> need to check the return value here.
>> Bummer. I was hoping this function could always return a sane value for dom0 
>> max
>> memory. But I'm not really sure what that would be if libxl_get_physinfo 
>> failed.
>>
> Yeah, We probably have some serious concerns if this fails. And given that
> libxlAddDom0 happens early while bootstrapping the libxl module, it might be
> good to warn the user (following similar pattern throughout the rest of the 
> code):
> 
> virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>_("libxl_get_physinfo_info failed"));
> 
> or perhaps simply VIR_WARN?
> 
 +ret = (physinfo.total_pages * cfg->verInfo->pagesize) / 1024;
 +libxl_physinfo_dispose();
 +
 + cleanup:
 +virStringListFree(cmd_tokens);
 +virStringListFree(mem_tokens);
 +

Re: [libvirt] [PATCH 2/2] libxl: fix dom0 maximum memory setting

[Joao Martins]

On 02/08/2017 04:06 PM, Jim Fehlig wrote:
> Joao Martins wrote:
>> On 02/02/2017 10:31 PM, Jim Fehlig wrote:
>>> When the libxl driver is initialized, it creates a virDomainDef
>>> object for dom0 and adds it to the list of domains. Total memory
>>> for dom0 was being set from the max_memkb field of libxl_dominfo
>>> struct retrieved from libxl, but this field can be set to
>>> LIBXL_MEMKB_DEFAULT (~0ULL) if dom0 maximum memory has not been
>>> explicitly set by the user.
>>>
>>> This patch adds some simple parsing of the Xen commandline,
>>> looking for a dom0_mem parameter that also specifies a 'max' value.
>>> If not specified, dom0 maximum memory is effectively all physical
>>> host memory.
>>>
>>> Signed-off-by: Jim Fehlig 
>>> ---
>>>  src/libxl/libxl_conf.c   | 75 
>>> 
>>>  src/libxl/libxl_conf.h   |  3 ++
>>>  src/libxl/libxl_driver.c |  2 +-
>>>  3 files changed, 79 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
>>> index b5186f2..bfe0e92 100644
>>> --- a/src/libxl/libxl_conf.c
>>> +++ b/src/libxl/libxl_conf.c
>>> @@ -34,6 +34,7 @@
>>>  #include "internal.h"
>>>  #include "virlog.h"
>>>  #include "virerror.h"
>>> +#include "c-ctype.h"
>>>  #include "datatypes.h"
>>>  #include "virconf.h"
>>>  #include "virfile.h"
>>> @@ -1530,6 +1531,80 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr 
>>> cfg,
>>>  
>>>  }
>>>  
>>> +/*
>>> + * dom0's maximum memory can be controled by the user with the 'dom0_mem' 
>>> Xen
>>> + * command line parameter. E.g. to set dom0's initial memory to 4G and max
>>> + * memory to 8G: dom0_mem=4G,max:8G
>>> + *
>>> + * If not constrained by the user, dom0 can effectively use all host 
>>> memory.
>>> + * This function returns the configured maximum memory for dom0 in 
>>> kilobytes,
>>> + * either the user-specified value or total physical memory as a default.
>>> + */
>>> +unsigned long long
>>> +libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg)
>>> +{
>>> +char **cmd_tokens = NULL;
>>> +char **mem_tokens = NULL;
>>> +size_t i;
>>> +size_t j;
>>> +unsigned long long ret;
>>> +libxl_physinfo physinfo;
>>> +
>>> +if (cfg->verInfo->commandline == NULL ||
>>> +!(cmd_tokens = virStringSplit(cfg->verInfo->commandline, " ", 0)))
>>> +goto physmem;
>>> +
>>> +for (i = 0; cmd_tokens[i] != NULL; i++) {
>>> +if (!STRPREFIX(cmd_tokens[i], "dom0_mem="))
>>> +continue;
>>> +
>>> +if (!(mem_tokens = virStringSplit(cmd_tokens[i], ",", 0)))
>>> +break;
>>> +for (j = 0; mem_tokens[j] != NULL; j++) {
>>> +if (STRPREFIX(mem_tokens[j], "max:")) {
>>> +char *p = mem_tokens[j] + 4;
>>> +unsigned long long multiplier = 1;
>>> +
>>> +while (c_isdigit(*p))
>>> +p++;
>>> +if (virStrToLong_ull(mem_tokens[j] + 4, , 10, ) < 0)
>>> +break;
>>> +if (*p) {
>>> +switch (*p) {
>>> +case 'k':
>>> +case 'K':
>>> +multiplier = 1024;
>>> +break;
>>> +case 'm':
>>> +case 'M':
>>> +multiplier = 1024 * 1024;
>>> +break;
>>> +case 'g':
>>> +case 'G':
>>> +multiplier = 1024 * 1024 * 1024;
>>> +break;
>>> +}
>>> +}
>>> +ret = (ret * multiplier) / 1024;
>>> +goto cleanup;
>>> +}
>>> +}
>>> +}
>>> +
>>> + physmem:
>>> +/* No 'max' specified in dom0_mem, so dom0 can use all physical memory 
>>> */
>>> +libxl_physinfo_init();
>>> +libxl_get_physinfo(cfg->ctx, );
>> Despite being an unlikely event, libxl_get_physinfo can fail here - I think 
>> you
>> need to check the return value here.
> 
> Bummer. I was hoping this function could always return a sane value for dom0 
> max
> memory. But I'm not really sure what that would be if libxl_get_physinfo 
> failed.
> 
Yeah, We probably have some serious concerns if this fails. And given that
libxlAddDom0 happens early while bootstrapping the libxl module, it might be
good to warn the user (following similar pattern throughout the rest of the 
code):

virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
   _("libxl_get_physinfo_info failed"));

or perhaps simply VIR_WARN?

>>> +ret = (physinfo.total_pages * cfg->verInfo->pagesize) / 1024;
>>> +libxl_physinfo_dispose();
>>> +
>>> + cleanup:
>>> +virStringListFree(cmd_tokens);
>>> +virStringListFree(mem_tokens);
>>> +return ret;
>>> +}
>>> +
>>> +
>>>  #ifdef LIBXL_HAVE_DEVICE_CHANNEL
>>>  static int
>>>  libxlPrepareChannel(virDomainChrDefPtr channel,
>>> diff --git 

Re: [libvirt] [PATCH 2/2] libxl: fix dom0 maximum memory setting

[Jim Fehlig]

Joao Martins wrote:
> On 02/02/2017 10:31 PM, Jim Fehlig wrote:
>> When the libxl driver is initialized, it creates a virDomainDef
>> object for dom0 and adds it to the list of domains. Total memory
>> for dom0 was being set from the max_memkb field of libxl_dominfo
>> struct retrieved from libxl, but this field can be set to
>> LIBXL_MEMKB_DEFAULT (~0ULL) if dom0 maximum memory has not been
>> explicitly set by the user.
>>
>> This patch adds some simple parsing of the Xen commandline,
>> looking for a dom0_mem parameter that also specifies a 'max' value.
>> If not specified, dom0 maximum memory is effectively all physical
>> host memory.
>>
>> Signed-off-by: Jim Fehlig 
>> ---
>>  src/libxl/libxl_conf.c   | 75 
>> 
>>  src/libxl/libxl_conf.h   |  3 ++
>>  src/libxl/libxl_driver.c |  2 +-
>>  3 files changed, 79 insertions(+), 1 deletion(-)
>>
>> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
>> index b5186f2..bfe0e92 100644
>> --- a/src/libxl/libxl_conf.c
>> +++ b/src/libxl/libxl_conf.c
>> @@ -34,6 +34,7 @@
>>  #include "internal.h"
>>  #include "virlog.h"
>>  #include "virerror.h"
>> +#include "c-ctype.h"
>>  #include "datatypes.h"
>>  #include "virconf.h"
>>  #include "virfile.h"
>> @@ -1530,6 +1531,80 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr 
>> cfg,
>>  
>>  }
>>  
>> +/*
>> + * dom0's maximum memory can be controled by the user with the 'dom0_mem' 
>> Xen
>> + * command line parameter. E.g. to set dom0's initial memory to 4G and max
>> + * memory to 8G: dom0_mem=4G,max:8G
>> + *
>> + * If not constrained by the user, dom0 can effectively use all host memory.
>> + * This function returns the configured maximum memory for dom0 in 
>> kilobytes,
>> + * either the user-specified value or total physical memory as a default.
>> + */
>> +unsigned long long
>> +libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg)
>> +{
>> +char **cmd_tokens = NULL;
>> +char **mem_tokens = NULL;
>> +size_t i;
>> +size_t j;
>> +unsigned long long ret;
>> +libxl_physinfo physinfo;
>> +
>> +if (cfg->verInfo->commandline == NULL ||
>> +!(cmd_tokens = virStringSplit(cfg->verInfo->commandline, " ", 0)))
>> +goto physmem;
>> +
>> +for (i = 0; cmd_tokens[i] != NULL; i++) {
>> +if (!STRPREFIX(cmd_tokens[i], "dom0_mem="))
>> +continue;
>> +
>> +if (!(mem_tokens = virStringSplit(cmd_tokens[i], ",", 0)))
>> +break;
>> +for (j = 0; mem_tokens[j] != NULL; j++) {
>> +if (STRPREFIX(mem_tokens[j], "max:")) {
>> +char *p = mem_tokens[j] + 4;
>> +unsigned long long multiplier = 1;
>> +
>> +while (c_isdigit(*p))
>> +p++;
>> +if (virStrToLong_ull(mem_tokens[j] + 4, , 10, ) < 0)
>> +break;
>> +if (*p) {
>> +switch (*p) {
>> +case 'k':
>> +case 'K':
>> +multiplier = 1024;
>> +break;
>> +case 'm':
>> +case 'M':
>> +multiplier = 1024 * 1024;
>> +break;
>> +case 'g':
>> +case 'G':
>> +multiplier = 1024 * 1024 * 1024;
>> +break;
>> +}
>> +}
>> +ret = (ret * multiplier) / 1024;
>> +goto cleanup;
>> +}
>> +}
>> +}
>> +
>> + physmem:
>> +/* No 'max' specified in dom0_mem, so dom0 can use all physical memory 
>> */
>> +libxl_physinfo_init();
>> +libxl_get_physinfo(cfg->ctx, );
> Despite being an unlikely event, libxl_get_physinfo can fail here - I think 
> you
> need to check the return value here.

Bummer. I was hoping this function could always return a sane value for dom0 max
memory. But I'm not really sure what that would be if libxl_get_physinfo failed.

> 
>> +ret = (physinfo.total_pages * cfg->verInfo->pagesize) / 1024;
>> +libxl_physinfo_dispose();
>> +
>> + cleanup:
>> +virStringListFree(cmd_tokens);
>> +virStringListFree(mem_tokens);
>> +return ret;
>> +}
>> +
>> +
>>  #ifdef LIBXL_HAVE_DEVICE_CHANNEL
>>  static int
>>  libxlPrepareChannel(virDomainChrDefPtr channel,
>> diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
>> index 69d7885..c4ddbfe 100644
>> --- a/src/libxl/libxl_conf.h
>> +++ b/src/libxl/libxl_conf.h
>> @@ -173,6 +173,9 @@ libxlDriverNodeGetInfo(libxlDriverPrivatePtr driver,
>>  int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
>>const char *filename);
>>  
>> +unsigned long long
>> +libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg);
>> +
>>  int
>>  libxlMakeDisk(virDomainDiskDefPtr l_dev, libxl_device_disk *x_dev);
>>  int
>> diff --git 

Re: [libvirt] [PATCH 2/2] libxl: fix dom0 maximum memory setting

[Joao Martins]

On 02/02/2017 10:31 PM, Jim Fehlig wrote:
> When the libxl driver is initialized, it creates a virDomainDef
> object for dom0 and adds it to the list of domains. Total memory
> for dom0 was being set from the max_memkb field of libxl_dominfo
> struct retrieved from libxl, but this field can be set to
> LIBXL_MEMKB_DEFAULT (~0ULL) if dom0 maximum memory has not been
> explicitly set by the user.
> 
> This patch adds some simple parsing of the Xen commandline,
> looking for a dom0_mem parameter that also specifies a 'max' value.
> If not specified, dom0 maximum memory is effectively all physical
> host memory.
> 
> Signed-off-by: Jim Fehlig 
> ---
>  src/libxl/libxl_conf.c   | 75 
> 
>  src/libxl/libxl_conf.h   |  3 ++
>  src/libxl/libxl_driver.c |  2 +-
>  3 files changed, 79 insertions(+), 1 deletion(-)
> 
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index b5186f2..bfe0e92 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -34,6 +34,7 @@
>  #include "internal.h"
>  #include "virlog.h"
>  #include "virerror.h"
> +#include "c-ctype.h"
>  #include "datatypes.h"
>  #include "virconf.h"
>  #include "virfile.h"
> @@ -1530,6 +1531,80 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
>  
>  }
>  
> +/*
> + * dom0's maximum memory can be controled by the user with the 'dom0_mem' Xen
> + * command line parameter. E.g. to set dom0's initial memory to 4G and max
> + * memory to 8G: dom0_mem=4G,max:8G
> + *
> + * If not constrained by the user, dom0 can effectively use all host memory.
> + * This function returns the configured maximum memory for dom0 in kilobytes,
> + * either the user-specified value or total physical memory as a default.
> + */
> +unsigned long long
> +libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg)
> +{
> +char **cmd_tokens = NULL;
> +char **mem_tokens = NULL;
> +size_t i;
> +size_t j;
> +unsigned long long ret;
> +libxl_physinfo physinfo;
> +
> +if (cfg->verInfo->commandline == NULL ||
> +!(cmd_tokens = virStringSplit(cfg->verInfo->commandline, " ", 0)))
> +goto physmem;
> +
> +for (i = 0; cmd_tokens[i] != NULL; i++) {
> +if (!STRPREFIX(cmd_tokens[i], "dom0_mem="))
> +continue;
> +
> +if (!(mem_tokens = virStringSplit(cmd_tokens[i], ",", 0)))
> +break;
> +for (j = 0; mem_tokens[j] != NULL; j++) {
> +if (STRPREFIX(mem_tokens[j], "max:")) {
> +char *p = mem_tokens[j] + 4;
> +unsigned long long multiplier = 1;
> +
> +while (c_isdigit(*p))
> +p++;
> +if (virStrToLong_ull(mem_tokens[j] + 4, , 10, ) < 0)
> +break;
> +if (*p) {
> +switch (*p) {
> +case 'k':
> +case 'K':
> +multiplier = 1024;
> +break;
> +case 'm':
> +case 'M':
> +multiplier = 1024 * 1024;
> +break;
> +case 'g':
> +case 'G':
> +multiplier = 1024 * 1024 * 1024;
> +break;
> +}
> +}
> +ret = (ret * multiplier) / 1024;
> +goto cleanup;
> +}
> +}
> +}
> +
> + physmem:
> +/* No 'max' specified in dom0_mem, so dom0 can use all physical memory */
> +libxl_physinfo_init();
> +libxl_get_physinfo(cfg->ctx, );
Despite being an unlikely event, libxl_get_physinfo can fail here - I think you
need to check the return value here.

> +ret = (physinfo.total_pages * cfg->verInfo->pagesize) / 1024;
> +libxl_physinfo_dispose();
> +
> + cleanup:
> +virStringListFree(cmd_tokens);
> +virStringListFree(mem_tokens);
> +return ret;
> +}
> +
> +
>  #ifdef LIBXL_HAVE_DEVICE_CHANNEL
>  static int
>  libxlPrepareChannel(virDomainChrDefPtr channel,
> diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
> index 69d7885..c4ddbfe 100644
> --- a/src/libxl/libxl_conf.h
> +++ b/src/libxl/libxl_conf.h
> @@ -173,6 +173,9 @@ libxlDriverNodeGetInfo(libxlDriverPrivatePtr driver,
>  int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
>const char *filename);
>  
> +unsigned long long
> +libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg);
> +
>  int
>  libxlMakeDisk(virDomainDiskDefPtr l_dev, libxl_device_disk *x_dev);
>  int
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 921cc93..e54b3b7 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -615,7 +615,7 @@ libxlAddDom0(libxlDriverPrivatePtr driver)
>  if (virDomainDefSetVcpus(vm->def, d_info.vcpu_online) < 0)
>  goto cleanup;
>  vm->def->mem.cur_balloon = 

[libvirt] [PATCH 2/2] libxl: fix dom0 maximum memory setting

[Jim Fehlig]

When the libxl driver is initialized, it creates a virDomainDef
object for dom0 and adds it to the list of domains. Total memory
for dom0 was being set from the max_memkb field of libxl_dominfo
struct retrieved from libxl, but this field can be set to
LIBXL_MEMKB_DEFAULT (~0ULL) if dom0 maximum memory has not been
explicitly set by the user.

This patch adds some simple parsing of the Xen commandline,
looking for a dom0_mem parameter that also specifies a 'max' value.
If not specified, dom0 maximum memory is effectively all physical
host memory.

Signed-off-by: Jim Fehlig 
---
 src/libxl/libxl_conf.c   | 75 
 src/libxl/libxl_conf.h   |  3 ++
 src/libxl/libxl_driver.c |  2 +-
 3 files changed, 79 insertions(+), 1 deletion(-)

diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index b5186f2..bfe0e92 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -34,6 +34,7 @@
 #include "internal.h"
 #include "virlog.h"
 #include "virerror.h"
+#include "c-ctype.h"
 #include "datatypes.h"
 #include "virconf.h"
 #include "virfile.h"
@@ -1530,6 +1531,80 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
 
 }
 
+/*
+ * dom0's maximum memory can be controled by the user with the 'dom0_mem' Xen
+ * command line parameter. E.g. to set dom0's initial memory to 4G and max
+ * memory to 8G: dom0_mem=4G,max:8G
+ *
+ * If not constrained by the user, dom0 can effectively use all host memory.
+ * This function returns the configured maximum memory for dom0 in kilobytes,
+ * either the user-specified value or total physical memory as a default.
+ */
+unsigned long long
+libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg)
+{
+char **cmd_tokens = NULL;
+char **mem_tokens = NULL;
+size_t i;
+size_t j;
+unsigned long long ret;
+libxl_physinfo physinfo;
+
+if (cfg->verInfo->commandline == NULL ||
+!(cmd_tokens = virStringSplit(cfg->verInfo->commandline, " ", 0)))
+goto physmem;
+
+for (i = 0; cmd_tokens[i] != NULL; i++) {
+if (!STRPREFIX(cmd_tokens[i], "dom0_mem="))
+continue;
+
+if (!(mem_tokens = virStringSplit(cmd_tokens[i], ",", 0)))
+break;
+for (j = 0; mem_tokens[j] != NULL; j++) {
+if (STRPREFIX(mem_tokens[j], "max:")) {
+char *p = mem_tokens[j] + 4;
+unsigned long long multiplier = 1;
+
+while (c_isdigit(*p))
+p++;
+if (virStrToLong_ull(mem_tokens[j] + 4, , 10, ) < 0)
+break;
+if (*p) {
+switch (*p) {
+case 'k':
+case 'K':
+multiplier = 1024;
+break;
+case 'm':
+case 'M':
+multiplier = 1024 * 1024;
+break;
+case 'g':
+case 'G':
+multiplier = 1024 * 1024 * 1024;
+break;
+}
+}
+ret = (ret * multiplier) / 1024;
+goto cleanup;
+}
+}
+}
+
+ physmem:
+/* No 'max' specified in dom0_mem, so dom0 can use all physical memory */
+libxl_physinfo_init();
+libxl_get_physinfo(cfg->ctx, );
+ret = (physinfo.total_pages * cfg->verInfo->pagesize) / 1024;
+libxl_physinfo_dispose();
+
+ cleanup:
+virStringListFree(cmd_tokens);
+virStringListFree(mem_tokens);
+return ret;
+}
+
+
 #ifdef LIBXL_HAVE_DEVICE_CHANNEL
 static int
 libxlPrepareChannel(virDomainChrDefPtr channel,
diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
index 69d7885..c4ddbfe 100644
--- a/src/libxl/libxl_conf.h
+++ b/src/libxl/libxl_conf.h
@@ -173,6 +173,9 @@ libxlDriverNodeGetInfo(libxlDriverPrivatePtr driver,
 int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
   const char *filename);
 
+unsigned long long
+libxlDriverGetDom0MaxmemConf(libxlDriverConfigPtr cfg);
+
 int
 libxlMakeDisk(virDomainDiskDefPtr l_dev, libxl_device_disk *x_dev);
 int
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 921cc93..e54b3b7 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -615,7 +615,7 @@ libxlAddDom0(libxlDriverPrivatePtr driver)
 if (virDomainDefSetVcpus(vm->def, d_info.vcpu_online) < 0)
 goto cleanup;
 vm->def->mem.cur_balloon = d_info.current_memkb;
-virDomainDefSetMemoryTotal(vm->def, d_info.max_memkb);
+virDomainDefSetMemoryTotal(vm->def, libxlDriverGetDom0MaxmemConf(cfg));
 
 ret = 0;
 
-- 
2.9.2

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