linux-kernel - Re: [PATCH v2 4/5] arm64: Use __tlbi

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Date:   Tue, 3 Jan 2017 15:57:56 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Christopher Covington <cov@...eaurora.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, shankerd@...eaurora.org,
        timur@...eaurora.org
Subject: Re: [PATCH v2 4/5] arm64: Use __tlbi_dsb() macros in KVM code

On Thu, Dec 29, 2016 at 05:43:34PM -0500, Christopher Covington wrote:
> Refactor the KVM code to use the newly introduced __tlbi_dsb macros, which
> will allow an errata workaround that repeats tlbi dsb sequences to only
> change one location. This is not intended to change the generated assembly
> and comparing before and after vmlinux objdump shows no functional changes.

> @@ -40,9 +41,7 @@ void __hyp_text __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
>  	 * complete (S1 + S2) walk based on the old Stage-2 mapping if
>  	 * the Stage-1 invalidation happened first.
>  	 */
> -	dsb(ish);

Looks like this got accidentally removed. AFAICT it is still necessary.

> -	asm volatile("tlbi vmalle1is" : : );
> -	dsb(ish);
> +	__tlbi_dsb(vmalle1is, ish);
>  	isb();

Thanks,
Mark.