linux-kernel - Re: [PATCH 1/1] x86: Exclude E820_RESERVED regions and memory holes above 4 GB from direct mapping.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAE9FiQUNwK5=Nos7Ce_DS1aSXgf0WNUgE=5HXnt4E01JWYbWjQ@mail.gmail.com>
Date:	Fri, 16 Dec 2011 12:59:38 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jacob Shin <jacob.shin@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH 1/1] x86: Exclude E820_RESERVED regions and memory holes
 above 4 GB from direct mapping.

On Fri, Dec 16, 2011 at 10:32 AM, H. Peter Anvin <hpa@...or.com> wrote:
>
> Well, there are two options for memory hotplug: either we always leave
> address space that can be used for memory hotplug mapped at all times, or we
> need to track it anyway.  Either way we need to know where there regions
> are.  Am I correct that right now we always map memory hotpluggable regions,
> being below the top pfn?

in arch/x86/mm/init_64.c::arch_add_memory()
it will call init_memory_mapping to map new added memory.
and will update max_pfn_mapped, max-pfn, max_low_pfn.

Thanks

Yinghai Lu
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/