linux-kernel - Re: [PATCH v3 2/6] KVM: VMX: Extend BUILD_CONTROLS

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Date:   Fri, 6 Aug 2021 17:51:00 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Zeng Guang <guang.zeng@...el.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Kim Phillips <kim.phillips@....com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jethro Beekman <jethro@...tanix.com>,
        Kai Huang <kai.huang@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Robert Hu <robert.hu@...el.com>,
        Gao Chao <chao.gao@...el.com>,
        Robert Hoo <robert.hu@...ux.intel.com>
Subject: Re: [PATCH v3 2/6] KVM: VMX: Extend BUILD_CONTROLS_SHADOW macro to
 support 64-bit variation

On 06/08/21 00:32, Sean Christopherson wrote:
>> -BUILD_CONTROLS_SHADOW(vm_entry, VM_ENTRY_CONTROLS)
>> -BUILD_CONTROLS_SHADOW(vm_exit, VM_EXIT_CONTROLS)
>> -BUILD_CONTROLS_SHADOW(pin, PIN_BASED_VM_EXEC_CONTROL)
>> -BUILD_CONTROLS_SHADOW(exec, CPU_BASED_VM_EXEC_CONTROL)
>> -BUILD_CONTROLS_SHADOW(secondary_exec, SECONDARY_VM_EXEC_CONTROL)
>> +BUILD_CONTROLS_SHADOW(vm_entry, VM_ENTRY_CONTROLS, 32)
>> +BUILD_CONTROLS_SHADOW(vm_exit, VM_EXIT_CONTROLS, 32)
>> +BUILD_CONTROLS_SHADOW(pin, PIN_BASED_VM_EXEC_CONTROL, 32)
>> +BUILD_CONTROLS_SHADOW(exec, CPU_BASED_VM_EXEC_CONTROL, 32)
>> +BUILD_CONTROLS_SHADOW(secondary_exec, SECONDARY_VM_EXEC_CONTROL, 32)
>> +BUILD_CONTROLS_SHADOW(tertiary_exec, TERTIARY_VM_EXEC_CONTROL, 64)
> 
> This fails to compile because all the TERTIARY collateral is in a later patch.
> 
> I think I'd also prefer hiding the 32/64 param via more macros, e.g.
> 
> #define __BUILD_CONTROLS_SHADOW(lname, uname, bits)				\

No, please don't. :)  Also because the 64 bit version is used only once.

Agreed on keeping everything here except for TERTIARY_VM_EXEC_CONTROL, 
and moving that line to patch 3.

Paolo