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Date:   Fri, 4 Oct 2019 14:02:22 -0700
From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Jim Mattson <jmattson@google.com>
Cc:     Yang Weijiang <weijiang.yang@intel.com>,
        kvm list <kvm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Radim =?utf-8?B?S3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        yu.c.zhang@intel.com, alazar@bitdefender.com
Subject: Re: [PATCH v5 2/9] vmx: spp: Add control flags for Sub-Page
 Protection(SPP)
Message-ID: <20191004210221.GB19503@linux.intel.com>
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On Fri, Oct 04, 2019 at 01:48:34PM -0700, Jim Mattson wrote:
> On Tue, Sep 17, 2019 at 1:52 AM Yang Weijiang <weijiang.yang@intel.com> wrote:
> > @@ -7521,6 +7527,10 @@ static __init int hardware_setup(void)
> >         if (!cpu_has_vmx_flexpriority())
> >                 flexpriority_enabled = 0;
> >
> > +       if (cpu_has_vmx_ept_spp() && enable_ept &&
> > +           boot_cpu_has(X86_FEATURE_SPP))
> > +               spp_supported = 1;
> 
> Don't cpu_has_vmx_ept_spp() and boot_cpu_has(X86_FEATURE_SPP) test
> exactly the same thing?

More or less.  I'm about to hit 'send' on a series to eliminate the
synthetic VMX features flags.  If that goes through, the X86_FEATURE_SPP
flag can also go away.