linux-kernel - Re: [PATCH] KVM: SVM: fix trashing of MSR_TSC

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]

Date:	Fri, 8 Jul 2016 07:15:39 -0400 (EDT)
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Eduardo Habkost <ehabkost@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	stable@...r.kernel.org, Yazen Ghannam <yazen.ghannam@....com>,
	Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH] KVM: SVM: fix trashing of MSR_TSC_AUX

> Ok, I'll go through the features and see what kind of state the kernel
> programs in there and add them to a VMStateDescription thing. Hohumm,
> makes sense to me.

It does sometimes happen that there is no state.  For example it could be
an MSR that we are already getting in and out of KVM.  However, it is way
more common that you have to add support for reading/writing the MSR in
KVM as well, and then teach QEMU's target-i386/kvm.c about it as well.

It's hard to say without knowing exactly what the feature is about...
Is there an architecture manual out there that documents it?

Paolo