linux-kernel - Re: [PATCH v2 2/5] arm64: Work around Falkor erratum 1003

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Message-ID: <20170104103322.GA20461@cbox>
Date:   Wed, 4 Jan 2017 11:33:22 +0100
From:   Christoffer Dall <christoffer.dall@...aro.org>
To:     Christopher Covington <cov@...eaurora.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        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, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 2/5] arm64: Work around Falkor erratum 1003

On Thu, Dec 29, 2016 at 05:43:32PM -0500, Christopher Covington wrote:
> From: Shanker Donthineni <shankerd@...eaurora.org>
> 
> On the Qualcomm Datacenter Technologies Falkor v1 CPU, memory accesses may
> allocate TLB entries using an incorrect ASID when TTBRx_EL1 is being
> updated. Changing the TTBRx_EL1[ASID] and TTBRx_EL1[BADDR] fields
> separately using a reserved ASID will ensure that there are no TLB entries
> with incorrect ASID after changing the the ASID.

When we restore guest state in KVM, we completely save and restore
TTBRx_EL1 from EL2. Would that be affected by this erratum?

Thanks,
-Christoffer