linux-kernel - Re: SATA resume slowness, e1000 MSI warning

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: <m1mz2jv9ue.fsf@ebiederm.dsl.xmission.com>
Date:	Sun, 11 Mar 2007 13:50:01 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Jens Axboe <jens.axboe@...cle.com>,
	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: SATA resume slowness, e1000 MSI warning

"Michael S. Tsirkin" <mst@...lanox.co.il> writes:

> OK I guess. I gather we assume writing read-only registers has no side effects?
> Are there rumors circulating wrt to these?

I haven't heard anything about that, and if we are writing the same value back
it should be pretty safe.

I have heard it asserted that at least one version of the pci spec
only required 32bit accesses to be supported by the hardware.  One of
these days I will have to look that and see if it is true.  I do know
it can be weird for hardware developers to support multiple kinds of
decode.   As I recall for pci and pci-x at the hardware level the only
difference in between 32bit transactions and smaller ones is the state
of the byte-enable lines.

Eric
-
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/