From: Avi Kivity <avi@qumranet.com>
To: Jesse <jdutton@neuraliq.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>, kvm@vger.kernel.org
Subject: Re: [PATCH]: pointer to vmcs getting lost
Date: Mon, 11 Aug 2008 14:48:13 +0300 [thread overview]
Message-ID: <48A026FD.3090003@qumranet.com> (raw)
In-Reply-To: <4894F7CA.1040901@neuraliq.com>
Jesse wrote:
> Marcelo Tosatti wrote:
>> Do you have preempt notifiers enabled in your host kernel?
>>
>
> No. And it looks like this is the real issue then. (Thank you for
> reading between the lines and figuring out what was really wrong).
>
> I compile the module apart from the kernel, so kvm support was not
> enabled when compiling the kernel. In 2.6.24, the PREEMPT_NOTIFIER
> option is not user selectable in make config, but is selected for you
> when kvm support is selected. IMO, this makes building modules apart
> from kernel source unadvised; however, there seems to be no alternative
> with the pace of kvm development relative to the kernel release schedule.
If the host kernel doesn't have preempt notifiers enabled, then the kvm
external module emulates preempt notifiers. This emulation uses the
debug registers, and you mention that you are debugging guests, so that
may be the source of the problem.
prev parent reply other threads:[~2008-08-11 11:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-01 22:18 [PATCH]: pointer to vmcs getting lost Jesse
2008-08-01 23:24 ` Marcelo Tosatti
2008-08-01 23:36 ` Jesse
2008-08-02 16:31 ` Marcelo Tosatti
2008-08-03 0:11 ` Jesse
2008-08-11 11:48 ` Avi Kivity [this message]
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