linux-kernel - Re: [PATCH v4 3/3] x86/acpi: take rsdp address for boot params if available

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Message-ID: <b747b936-e2c5-0d7c-aa9d-ce92a7057527@oracle.com>
Date:   Tue, 9 Oct 2018 09:22:24 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-doc@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        corbet@....net
Subject: Re: [PATCH v4 3/3] x86/acpi: take rsdp address for boot params if
 available

On 10/9/18 6:54 AM, Juergen Gross wrote:
> +
> +u64 x86_default_get_root_pointer(void)
> +{
> +	return boot_params.hdr.acpi_rsdp_addr;
> +}


Should we then update init_pvh_bootparams() with

    pvh_bootparams.hdr.acpi_rsdp_addr = pvh_start_info.rsdp_paddr;

(and drop x86_init.acpi.get_root_pointer = pvh_get_root_pointer;) ?

-boris

> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index 2792b5573818..50a2b492fdd6 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -31,7 +31,6 @@ static int __init iommu_init_noop(void) { return 0; }
>  static void iommu_shutdown_noop(void) { }
>  static bool __init bool_x86_init_noop(void) { return false; }
>  static void x86_op_int_noop(int cpu) { }
> -static u64 u64_x86_init_noop(void) { return 0; }
>  
>  /*
>   * The platform setup functions are preset with the default functions
> @@ -96,7 +95,7 @@ struct x86_init_ops x86_init __initdata = {
>  	},
>  
>  	.acpi = {
> -		.get_root_pointer	= u64_x86_init_noop,
> +		.get_root_pointer	= x86_default_get_root_pointer,
>  		.reduced_hw_early_init	= acpi_generic_reduced_hw_init,
>  	},
>  };