linux-kernel - Re: [RFC PATCH 0/4] KVM: Emulate UMIP (or almost do so)

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Message-ID: <70159308.29185317.1488834430533.JavaMail.zimbra@redhat.com>
Date:   Mon, 6 Mar 2017 16:07:10 -0500 (EST)
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Yu Zhang <yu.c.zhang@...ux.intel.com>
Cc:     qian ouyang <qian.ouyang@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] KVM: Emulate UMIP (or almost do so)



----- Original Message -----
> From: "Yu Zhang" <yu.c.zhang@...ux.intel.com>
> To: "Paolo Bonzini" <pbonzini@...hat.com>
> Cc: "qian ouyang" <qian.ouyang@...el.com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
> Sent: Wednesday, March 1, 2017 10:04:17 AM
> Subject: Re: [RFC PATCH 0/4] KVM: Emulate UMIP (or almost do so)
> 
> 
> 
> On 12/13/2016 7:03 PM, Paolo Bonzini wrote:
> >
> > On 13/12/2016 05:03, Li, Liang Z wrote:
> >> Hi Paolo,
> >>
> >> We intended to enable UMIP for KVM and found you had already worked on it.
> >> Do you have any plan for the following patch set? It's there anything else
> >> you expect
> >> us help to do?
> > Yes, I plan to resend these patches for 4.11.
> 
> Hi Paolo,
> 
>    Previously we saw your RFC patches of UMIP sent out, and we would
> like to try some unit test in Intel. I found a patch written by you in
> https://patchwork.kernel.org/patch/9225929/, guess this is for the kvm
> unit test(though I failed to git apply it directly).
>    And I wonder, when will it be integrated to kvm unit test repo?

Probably together with the patches for UMIP support and emulation.

>    Besides, is this all the test for UMIP unit test? I.e. do we need to
> construct a scenario in the test to trigger vm exit and let hypervisor
> inject a GP fault? - I did not see this scenario in this patch. Or any
> other suggestions? :-)

The unit test only tests that UMIP works as advertised; if the host processor
does not support UMIP, it will test the hypervisor emulation path.  Whenever
UMIP support is added to KVM, we will probably add a module parameter so that
we can force UMIP emulation path even on processor that have native support.

Paolo