linux-kernel - Re: [Qemu-devel] [Patch V2 1/2] x86, mce: Basic support to add LMCE support to QEMU

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: <20151214191145.GB18012@otc-brkl-03.jf.intel.com>
Date:	Mon, 14 Dec 2015 14:11:46 -0500
From:	"Raj, Ashok" <ashok.raj@...el.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Eduardo Habkost <ehabkost@...hat.com>, kvm@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>,
	Gong Chen <gong.chen@...el.com>,
	Gleb Natapov <gleb@...nel.org>, linux-kernel@...r.kernel.org,
	qemu-devel@...gnu.org, Andi Kleen <andi.kleen@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Ashok Raj <ashok.raj@...el.com>
Subject: Re: [Qemu-devel] [Patch V2 1/2] x86, mce: Basic support to add LMCE
 support to QEMU

On Mon, Dec 14, 2015 at 05:37:38PM +0100, Borislav Petkov wrote:
> 
> ... and obviously LMCE is vendor-specific so it cannot be enabled on
> !Intel guests with a define like that. mce_init() in qemu should check
> vendor too.
> 
> The same mistake was done with SER_P but that's much harder to change,
> as we discussed previously.
> 

This is mostly harmless.. since the MCG_CAP space is shared and has no
conflict between vendors. Also just the CAP being set has no effect.

The Guest OS needs to opt-in and the SIGBUS indicating SRAR are the only 
ones that are treated special treatment. Also Intel was the only one
broadcasting MCE's.. so we are like the rest now :-)

Cheers,
Ashok


--
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/