linux-kernel - Re: [PATCH] arm64: KVM: Use SMCCC_ARCH_WORKAROUND

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Date:   Mon, 5 Mar 2018 09:52:19 -0600
From:   Timur Tabi <timur@...eaurora.org>
To:     Shanker Donthineni <shankerd@...eaurora.org>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        Thomas Speier <tspeier@...eaurora.org>,
        Vikram Sethi <vikrams@...eaurora.org>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Sean Campbell <scampbel@...eaurora.org>
Subject: Re: [PATCH] arm64: KVM: Use SMCCC_ARCH_WORKAROUND_1 for Falkor BP hardening

On Fri, Mar 2, 2018 at 3:50 PM, Shanker Donthineni
<shankerd@...eaurora.org> wrote:
> diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
> index bb26382..6ecc249 100644
> --- a/arch/arm64/include/asm/cpucaps.h
> +++ b/arch/arm64/include/asm/cpucaps.h
> @@ -43,7 +43,7 @@
>  #define ARM64_SVE                              22
>  #define ARM64_UNMAP_KERNEL_AT_EL0              23
>  #define ARM64_HARDEN_BRANCH_PREDICTOR          24
> -#define ARM64_HARDEN_BP_POST_GUEST_EXIT                25
> +/* #define ARM64_UNALLOCATED_ENTRY                     25 */

Why not just delete the entry?  Is ARM64_NCAPS never supposed to get smaller?