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Subject: Re: [PATCH v4] x86/speculation/l1tf: Add KConfig for setting the L1D
 cache flush mode
To:     Abhishek Bhardwaj <abhishekbh@google.com>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Anthony Steinhauser <asteinhauser@google.com>,
        Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Mark Gross <mgross@linux.intel.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tony Luck <tony.luck@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Waiman Long <longman@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>, kvm@vger.kernel.org,
        x86@kernel.org
References: <20200708192546.4068026-1-abhishekbh@google.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <06f15327-f346-fb8d-cc8e-8e12c398324d@infradead.org>
Date:   Wed, 8 Jul 2020 12:34:01 -0700
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Hi again,

On 7/8/20 12:25 PM, Abhishek Bhardwaj wrote:
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index b277a2db62676..1f85374a0b812 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -107,4 +107,17 @@ config KVM_MMU_AUDIT
>  	 This option adds a R/W kVM module parameter 'mmu_audit', which allows
>  	 auditing of KVM MMU events at runtime.
>  
> +config KVM_VMENTRY_L1D_FLUSH
> +	int "L1D cache flush settings (1-3)"
> +	range 1 3
> +	default "2"
> +	depends on KVM && X86_64
> +	help
> +	 This setting determines the L1D cache flush behavior before a VMENTER.
> +	 This is similar to setting the option / parameter to
> +	 kvm-intel.vmentry_l1d_flush.
> +	 1 - Never flush.
> +	 2 - Conditionally flush.
> +	 3 - Always flush.
> +
>  endif # VIRTUALIZATION

If you do a v5, the help text lines (under "help") should be indented
with one tab + 2 spaces according to Documentation/process/coding-style.rst.

-- 
~Randy