From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@siemens.com>
Subject: Re: List of unaccessible x86 states
Date: Fri, 23 Oct 2009 15:08:21 +0200
Message-ID: <4AE1AAC5.1020105@siemens.com>
References: <4ADDB49B.3010101@siemens.com> <20091020184514.GA15411@amt.cnet>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: kvm-devel <kvm@vger.kernel.org>, Avi Kivity <avi@redhat.com>,
	Gleb Natapov <gleb@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Return-path: <kvm-owner@vger.kernel.org>
Received: from david.siemens.de ([192.35.17.14]:18609 "EHLO david.siemens.de"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1751487AbZJWNIa (ORCPT <rfc822;kvm@vger.kernel.org>);
	Fri, 23 Oct 2009 09:08:30 -0400
In-Reply-To: <20091020184514.GA15411@amt.cnet>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

Marcelo Tosatti wrote:
> On Tue, Oct 20, 2009 at 03:01:15PM +0200, Jan Kiszka wrote:
>> Hi all,
>>
>> as the list of yet user-unaccessible x86 states is a bit volatile ATM,
>> this is an attempt to collect the precise requirements for additional
>> state fields. Once everyone feels the list is complete, we can decide
>> how to partition it into one ore more substates for the new
>> KVM_GET/SET_VCPU_STATE interface.
>>
>> What I read so far (or tried to patch already):
>>
>> - nmi_masked
>> - nmi_pending
>> - nmi_injected
>> - kvm_queued_exception (whole struct content)
>> - KVM_REQ_TRIPLE_FAULT (from vcpu.requests)
>>
>> Unclear points (for me) from the last discussion:
>>
>> - sipi_vector
>> - MCE (covered via kvm_queued_exception, or does it require more?)
> 
> Should save/restore the MCE MSRs (its contents are currently
> lost/overwritten AFAICS).
> 
> MTRR contents are also dropped.

Hmm, the code path is winding, but aren't they already available to user
space via GET/SET_MSRS?

Jan