linux-kernel - Re: [PATCH 2/2] xen: Kconfig: nest Xen guest options

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Message-ID: <4e31301b-0e57-ac89-cd71-6ad5e1a66628@citrix.com>
Date:   Thu, 15 Oct 2020 14:10:40 +0100
From:   Andrew Cooper <andrew.cooper3@...rix.com>
To:     <boris.ostrovsky@...cle.com>, Jason Andryuk <jandryuk@...il.com>,
        "Juergen Gross" <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] xen: Kconfig: nest Xen guest options

On 15/10/2020 13:37, boris.ostrovsky@...cle.com wrote:
> On 10/14/20 1:53 PM, Jason Andryuk wrote:
>> +config XEN_512GB
>> +	bool "Limit Xen pv-domain memory to 512GB"
>> +	depends on XEN_PV && X86_64
>
> Why is X86_64 needed here?

>512G support was implemented using a direct-mapped P2M, and is rather
beyond the virtual address capabilities of 32bit.

~Andrew