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Date: Fri, 11 May 2018 11:43:59 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Wanpeng Li <kernellwp@gmail.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Tim Shearer <tshearer@advaoptical.com>,
        Liran Alon <liran.alon@oracle.com>
Subject: Re: [PATCH 2/3] KVM: X86: Allow userspace to disable ioport intercept
Message-ID: <20180511154359.GC26700@char.us.oracle.com>
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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@tencent.com>
> > 
> > Allow to disable ioport intercept by userspace.
> > 
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Radim Krčmář <rkrcmar@redhat.com>
> > Cc: Tim Shearer <tshearer@advaoptical.com>
> > Cc: Liran Alon <liran.alon@oracle.com>
> > Signed-off-by: Wanpeng Li <wanpengli@tencent.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..