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RE: [Xen-devel] [PATCH] Fix auto-ballooning of dom0 for HVMdomains

To: "Charles Coffing" <ccoffing@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] Fix auto-ballooning of dom0 for HVMdomains
From: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
Date: Sat, 20 May 2006 22:14:41 +0800
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Thread-topic: [Xen-devel] [PATCH] Fix auto-ballooning of dom0 for HVMdomains

>-----Original Message-----
>From: Charles Coffing [mailto:ccoffing@xxxxxxxxxx] 
>Sent: Saturday, May 20, 2006 3:59 AM
>To: Jiang, Yunhong; xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: RE: [Xen-devel] [PATCH] Fix auto-ballooning of dom0 
>for HVMdomains
>> On Thu, May 18, 2006 at 10:23 PM, in message
>"Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote: 
>> Hi, Charles
>>      Just one suggestion, for  xen- hvm- auto- balloon.diff, how
>> change 
>>              xc.domain_setmaxmem(self.domid, m)
>> to 
>>              xc.domain_setmaxmem(self.domid, self.info['memory'] *
>Ideally, yes, I would agree.  But later, in qemu, another
>increase_reservation() is called.  If I make the suggested change, I
>suspect that qemu will fail to get its memory.
>Or is this upper limit not checked when increase_reservation() is
>called from dom0?

I think when call increase_reservation()  on qemu, it called
xc_domain_setmaxmem() firstly.
See followed code on vl.c:

    nr_pages = info.nr_pages + extra_pages;

    if ( xc_domain_setmaxmem(xc_handle, domid, ---------> setmaxmem here
                             (nr_pages) * PAGE_SIZE/1024 ) != 0)
        fprintf(logfile, "set maxmem returned error %d\n", errno);

    if ( (page_array = (unsigned long *)
                        malloc(nr_pages * sizeof(unsigned long))) ==
        fprintf(logfile, "malloc returned error %d\n", errno);

    if (xc_domain_memory_increase_reservation(xc_handle, domid,
                                              extra_pages , 0, 0, NULL)
!= 0)
        fprintf(logfile, "increase reservation returned error %d\n",


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