From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoffer Dall Subject: Re: [PATCH v2 2/5] arm64: Work around Falkor erratum 1003 Date: Wed, 4 Jan 2017 11:33:22 +0100 Message-ID: <20170104103322.GA20461@cbox> References: <20161229224335.13531-1-cov@codeaurora.org> <20161229224335.13531-2-cov@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-doc@vger.kernel.org, kvm@vger.kernel.org, Marc Zyngier , Catalin Marinas , timur@codeaurora.org, Jonathan Corbet , Will Deacon , linux-kernel@vger.kernel.org, Paolo Bonzini , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org To: Christopher Covington Return-path: Content-Disposition: inline In-Reply-To: <20161229224335.13531-2-cov@codeaurora.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org On Thu, Dec 29, 2016 at 05:43:32PM -0500, Christopher Covington wrote: > From: Shanker Donthineni > > 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