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

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Date:   Thu, 18 Aug 2016 10:31:34 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Matthew Wilcox <mawilcox@...uxonhyperv.com>
Cc:     X86 ML <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: Re: [PATCH 1/2] x86: Set up resources correctly on Hyper-V Generation 2

On Thu, Aug 18, 2016 at 12:12 PM, Matthew Wilcox
<mawilcox@...uxonhyperv.com> wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
>
> 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@...rosoft.com>
> ---
>  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?