linux-kernel - Re: [PATCH] Add MCE support to KVM

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: <1239780297.20762.105.camel@yhuang-dev.sh.intel.com>
Date:	Wed, 15 Apr 2009 15:24:57 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] Add MCE support to KVM

On Tue, 2009-04-14 at 18:45 +0800, Avi Kivity wrote:
> Huang Ying wrote:
> >> I'm okay with an ioctl to setup MCE, but just make sure userspace has 
> >> all the information to know what the kernel can do rather than the 
> >> try-and-see-if-it-works approach.  We can publish this information via 
> >> KVM_CAP things, or via another ioctl (see KVM_GET_SUPPORTED_CPUID2 for 
> >> an example).
> >>     
> >
> > Yes. MCE support should be published by KVM_CAP_MCE and other features
> > can be published via reading the default value of MSR_IA32_MCG_CAP.
> >   
> 
> A problem with this is that you can only read an MSR after a vcpu has 
> been created.  But if you're writing a program to detect what features 
> are available (for example, when checking features common to a migration 
> pool), you don't want to create a vpcu (you could, but it's hacky).

Yes. You are right. I will change this as you said, something like
KVM_GET_SUPPORTED_CPUID2.

Best Regards,
Huang Ying


Download attachment "signature.asc" of type "application/pgp-signature" (198 bytes)