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

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Date:   Tue, 9 Oct 2018 15:25:43 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.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 09/10/2018 15:22, Boris Ostrovsky wrote:
> 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;) ?

I was planning to do this as a follow on patch.


Juergen

> 
> -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,
>>  	},
>>  };
> 
>