From: Avi Kivity <avi@redhat.com>
To: vatsa@linux.vnet.ibm.com
Cc: Anthony Liguori <aliguori@us.ibm.com>,
kvm@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>,
Chris Wright <chrisw@sous-sol.org>
Subject: Re: [PATCH] kvm-vmx: add module parameter to avoid trapping HLT instructions (v4)
Date: Mon, 06 Dec 2010 15:43:56 +0200 [thread overview]
Message-ID: <4CFCE89C.10904@redhat.com> (raw)
In-Reply-To: <20101206133952.GE440@linux.vnet.ibm.com>
On 12/06/2010 03:39 PM, Srivatsa Vaddagiri wrote:
> > >Also, just curious how this would work for idle vcpus that use mwait rather
> > >than hlt.
> >
> > We don't expose mwait to the guest (emulating mwait is very expensive).
>
> We seem to be queuing an exception upon mwait (EXIT_REASON_MWAIT_INSTRUCTION
> being handled by a handle_invalid_op()). Does that kill the guest?
It sends a #UD, which tells the guest mwait isn't supported. Usually
the guest will fall on its sword at this point, but that's not mandated.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2010-12-06 13:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-04 14:43 [PATCH] kvm-vmx: add module parameter to avoid trapping HLT instructions (v4) Anthony Liguori
2010-12-05 16:55 ` Srivatsa Vaddagiri
2010-12-06 13:27 ` Avi Kivity
2010-12-06 13:39 ` Srivatsa Vaddagiri
2010-12-06 13:43 ` Avi Kivity [this message]
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