Re: [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation 2

[Dan Williams]

On Thu, Aug 18, 2016 at 12:12 PM, Matthew Wilcox
<mawilcox@xxxxxxxxxxxxxxxxx> wrote:
> From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
>
> The Generation 2 Hyper-V virtual machine does not emulate PCI.
> This check causes the call to pcibios_resource_survey() to be skipped,
> and pcibios_resource_survey() calls e820_reserve_resources_late(), which
> is where PMEM resources are added to the resource tree.  With this patch,
> the PMEM devices now show up.
>
> Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
> ---
>  arch/x86/pci/common.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index 7b6a9d1..d39e799 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -516,11 +516,6 @@ void __init pcibios_set_cache_line_size(void)
>
>  int __init pcibios_init(void)
>  {
> -       if (!raw_pci_ops && !raw_pci_ext_ops) {
> -               printk(KERN_WARNING "PCI: System does not support PCI\n");
> -               return 0;
> -       }
> -
>         pcibios_set_cache_line_size();
>         pcibios_resource_survey();

Is this for the memmap= kernel command line option or the ACPI NFIT
method for defining NVDIMM resources?