From: Gleb Natapov <gleb@redhat.com>
To: "lim4@mymail.vcu.edu" <lim4@mymail.vcu.edu>
Cc: kvm@vger.kernel.org
Subject: Re: Ring privilege of host linux kernel
Date: Fri, 8 Mar 2013 13:42:41 +0200 [thread overview]
Message-ID: <20130308114241.GG24444@redhat.com> (raw)
In-Reply-To: <51396172.70905@mymail.vcu.edu>
On Thu, Mar 07, 2013 at 10:56:34PM -0500, lim4@mymail.vcu.edu wrote:
> As we have known, in KVM full virtualization, guest VM is running in
> non-root mode and KVM is running in root mode. While, in non-root
> mode, guest kernel is running in Ring 0 and Apps are running in Ring
> 3. However, what about the ring privilege for host linux?
>
> In my knowledge, host linux is not controlled by VMX instructions
> and VMCS/VMCB. therefore, host linux should be running in root mode.
> Before we install KVM, host linux just run in Ring 0 (at that time,
> there is no root mode or non-root mode because VMX is not active).
> Hence, after we install KVM module, host linux kernel should be
> still in Ring 0 of root mode and Apps in host should run in Ring 3
> of root mode. Is KVM running in higher privileged mode like Ring -1
> of root mode or also running in Ring 0 of root mode?
>
KVM and the Linux kernel are running in Ring 0 in root mode.
--
Gleb.
next prev parent reply other threads:[~2013-03-08 11:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-08 3:56 Ring privilege of host linux kernel lim4
2013-03-08 11:42 ` Gleb Natapov [this message]
2013-03-08 14:27 ` Min Li
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