linux-kernel - [RFC] Using per_cpu(processor) information to pipe it up the hypervisor. v1

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-next>] [day] [month] [year] [list]

Date:	Tue, 31 Jan 2012 10:32:03 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	linux-kernel@...r.kernel.org, lenb@...nel.org, len.brown@...el.com,
	linux-acpi@...r.kernel.org
Cc:	xen-devel@...ts.xensource.com
Subject: [RFC] Using per_cpu(processor) information to pipe it up the hypervisor. v1

I was wondering if you could advise me ontwo questions:
 - How to "get" ACPI PM information for processors that are down (either b/c of
   maxcpus=X or they are hot-plugged). The per_cpu(processor) is a great location
   to get all of this - but sadly it is not filled with information for dead CPUs.
   Is there another way to get this data?

 - Where should such a driver (see the patch please) live? I was thinking drivers/acpi/
   but since the "processor" is an exported symbol it could live in drivers/xen as well?
   What is your feeling about it?

Short description of the patch: It simple parses the "per_cpu(processor)" data and 
pipes it up the hypervisor and then unloads itself. It is a much shorter version
of https://lkml.org/lkml/2011/11/30/245, but it does have the caveat that it does
not work with 'maxcpus' or with hot-plugged CPUs or with limiting the amount of
CPUs a guest can see.

P.S.
Also the name of it stinks. 'Sink' or 'plumber' initially came to my mind. Any
thoughts of a better name?

Thanks!

 drivers/xen/Kconfig         |    5 +
 drivers/xen/Makefile        |    2 +-
 drivers/xen/acpi_xen_sink.c |  265 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 271 insertions(+), 1 deletions(-)

--
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/