Re: [PATCH v1 2/8] x86/xen: simplify xen_oldmem_pfn_is_ram()

[David Hildenbrand <david@xxxxxxxxxx>]

On 29.09.21 16:22, Boris Ostrovsky wrote:
> On 9/29/21 5:03 AM, David Hildenbrand wrote:
> > On 29.09.21 10:45, David Hildenbrand wrote:
> > > >
> > > Can we go one step further and do
> > >
> > >
> > > @@ -20,24 +20,11 @@ static int xen_oldmem_pfn_is_ram(unsigned long pfn)
> > >            struct xen_hvm_get_mem_type a = {
> > >                    .domid = DOMID_SELF,
> > >                    .pfn = pfn,
> > > +               .mem_type = HVMMEM_ram_rw,
> > >            };
> > > -       int ram;
> > >     -       if (HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a))
> > > -               return -ENXIO;
> > > -
> > > -       switch (a.mem_type) {
> > > -       case HVMMEM_mmio_dm:
> > > -               ram = 0;
> > > -               break;
> > > -       case HVMMEM_ram_rw:
> > > -       case HVMMEM_ram_ro:
> > > -       default:
> > > -               ram = 1;
> > > -               break;
> > > -       }
> > > -
> > > -       return ram;
> > > +       HYPERVISOR_hvm_op(HVMOP_get_mem_type, &a);
> > > +       return a.mem_type != HVMMEM_mmio_dm;
>
> I was actually thinking of asking you to add another patch with pr_warn_once() 
> here (and print error code as well). This call failing is indication of 
> something going quite wrong and it would be good to know about this.
Will include a patch in v2, thanks!


--
Thanks,

David / dhildenb