linux-kernel - RE: [PATCH v2] mce: use safe MSR accesses

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: <3908561D78D1C84285E8C5FCA982C28F32A19935@ORSMSX114.amr.corp.intel.com>
Date:	Fri, 13 Mar 2015 16:29:39 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"jesse.larrew@....com" <jesse.larrew@....com>,
	"x86@...nel.org" <x86@...nel.org>
CC:	Joel Schopp <joel.schopp@....com>, Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] mce: use safe MSR accesses

-				 rdmsrl(msrs[i], val);
-
-				 /* CntP bit set? */
-				 if (val & BIT_64(62)) {
-					val &= ~BIT_64(62);
-					wrmsrl(msrs[i], val);
-				 }
+				 /* Clear CntP bit safely */
+				 msr_clear_bit(msrs[i], 62);

Very nice! Clean solution with less lines of code than the original.

Acked-by: Tony Luck <tony.luck@...el.com>
--
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/