Re: [Xen-devel] [RFC][PATCH 09/13] xen: enable XENMEM_set_memory_map in hvm

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

On 2015/4/20 21:46, Jan Beulich wrote:
> > > > On 10.04.15 at 11:22, <tiejun.chen@xxxxxxxxx> wrote:
> > --- a/xen/arch/x86/hvm/hvm.c
> > +++ b/xen/arch/x86/hvm/hvm.c
> > @@ -4729,7 +4729,6 @@ static long hvm_memory_op(int cmd, 
> > XEN_GUEST_HANDLE_PARAM(void) arg)
> >
> >       switch ( cmd & MEMOP_CMD_MASK )
> >       {
> > -    case XENMEM_memory_map:
> Title and description talk about XENMEM_set_memory_map only. As
> I think the implementation is right, the former will need updating. Do
> you actually need a HVM domain to be able to XENMEM_set_memory_map
Yes. Actually we need to enable two hypercalls here,

#1. XENMEM_set_memory_map --> Set
#2. XENMEM_memory_map --> Get

> on itself? If not, it should probably replace XENMEM_memory_map here.
Just rephrase,

xen: enable XENMEM set/get memory_map in hvm

This patch enables XENMEM_set_memory_map in hvm and then we can use
it to setup the e820 mappings, and finally hvmloader can get
these mappings with XENMEM_memory_map.

Thanks
Tiejun

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