linux-kernel - Re: [PATCH v8 08/11] x86/tdx: Wire up KVM hypercalls

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Message-ID: <20211006193440.jgmagja3vynqnnis@treble>
Date:   Wed, 6 Oct 2021 12:34:40 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 08/11] x86/tdx: Wire up KVM hypercalls

On Mon, Oct 04, 2021 at 07:52:02PM -0700, Kuppuswamy Sathyanarayanan wrote:
>  static inline long kvm_hypercall0(unsigned int nr)
>  {
>  	long ret;
> +
> +	if (cc_platform_has(CC_ATTR_GUEST_TDX))
> +		return tdx_kvm_hypercall(nr, 0, 0, 0, 0);

Hm, I'm still thinking that figuring out a way to convert all the
cc_platform_has() stuff to normal cpu features -- or at least inline
wrappers around them -- would be really nice here.  Then this could just
be a nice fast static_cpu_has().

-- 
Josh