linux-kernel - Re: [PATCH 2/3] KVM: X86: Allow userspace to disable ioport intercept

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Message-ID: <CALMp9eT5aD0tjdTzTABo5a0aEtB52bZ7_-PCTF35Tikf8Q-vDg@mail.gmail.com>
Date:   Tue, 15 May 2018 14:56:41 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     Wanpeng Li <kernellwp@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tim Shearer <tshearer@...aoptical.com>,
        Liran Alon <liran.alon@...cle.com>
Subject: Re: [PATCH 2/3] KVM: X86: Allow userspace to disable ioport intercept

I'd prefer to let the kvm module have the final say as to whether or
not to allow userspace to do this.

On Fri, May 11, 2018 at 8:43 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> On Fri, May 11, 2018 at 11:42:46AM -0400, Konrad Rzeszutek Wilk wrote:
>> On Mon, Apr 16, 2018 at 10:46:01PM -0700, Wanpeng Li wrote:
>> > From: Wanpeng Li <wanpengli@...cent.com>
>> >
>> > Allow to disable ioport intercept by userspace.
>> >
>> > Cc: Paolo Bonzini <pbonzini@...hat.com>
>> > Cc: Radim Krčmář <rkrcmar@...hat.com>
>> > Cc: Tim Shearer <tshearer@...aoptical.com>
>> > Cc: Liran Alon <liran.alon@...cle.com>
>> > Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
>> > ---
>> >  Documentation/virtual/kvm/api.txt | 11 +++++++++++
>> >  arch/x86/include/asm/kvm_host.h   |  2 ++
>> >  arch/x86/kvm/x86.c                |  5 +++++
>> >  include/uapi/linux/kvm.h          |  1 +
>> >  4 files changed, 19 insertions(+)
>> >
>> > diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
>> > index 1c7958b..3d0488e 100644
>> > --- a/Documentation/virtual/kvm/api.txt
>> > +++ b/Documentation/virtual/kvm/api.txt
>> > @@ -4378,6 +4378,17 @@ all such vmexits.
>> >
>> >  Do not enable KVM_FEATURE_PV_UNHALT if you disable HLT exits.
>> >
>> > +7.14 KVM_CAP_IOPORT_DISABLE_INTERCEPT
>> > +
>> > +Architectures: x86
>
> And to be exact: Intel only..