linux-kernel - Re: [Xen-devel] [PATCH 13/13] xen: allow more than 512 GB of RAM for 64 bit pv-domains

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Date:	Wed, 18 Feb 2015 09:49:32 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Juergen Gross" <JGross@...e.com>
Cc:	<david.vrabel@...rix.com>, <xen-devel@...ts.xensource.com>,
	<boris.ostrovsky@...cle.com>, "Paul Bolle" <pebolle@...cali.nl>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 13/13] xen: allow more than 512 GB of
 RAM for 64 bit pv-domains

>>> On 18.02.15 at 10:37, <JGross@...e.com> wrote:
> On 02/18/2015 10:21 AM, Paul Bolle wrote:
>> On Wed, 2015-02-18 at 07:52 +0100, Juergen Gross wrote:
>>> --- a/arch/x86/xen/Kconfig
>>> +++ b/arch/x86/xen/Kconfig
>>> @@ -23,14 +23,29 @@ config XEN_PVHVM
>>>   	def_bool y
>>>   	depends on XEN && PCI && X86_LOCAL_APIC
>>>
>>> -config XEN_MAX_DOMAIN_MEMORY
>>> -       int
>>> -       default 500 if X86_64
>>> -       default 64 if X86_32
>>> -       depends on XEN
>>> -       help
>>> -         This only affects the sizing of some bss arrays, the unused
>>> -         portions of which are freed.
>>> +if X86_64
>>
>> Not
>>      && XEN
>> ?
> 
> The complete directory is made only if CONFIG_XEN is set.

But that doesn't mean this file gets used only when XEN is enabled.
I would think though that an eventual "if XEN" should have wider
scope than just this option (i.e. likely almost the entire file).

Jan

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