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Mon, 08 Jun 2020 07:51:50 -0700 (PDT) Date: Mon, 8 Jun 2020 15:51:45 +0100 From: Andrew Scull To: Marc Zyngier Subject: Re: [PATCH v2] KVM: arm64: Remove host_cpu_context member from vcpu structure Message-ID: <20200608145145.GA96714@google.com> References: <20200608085657.1405730-1-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608085657.1405730-1-maz@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200608_075154_785944_9D6AEA72 X-CRM114-Status: GOOD ( 12.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , kvm@vger.kernel.org, Suzuki K Poulose , James Morse , Julien Thierry , kernel-team@android.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Jun 08, 2020 at 09:56:57AM +0100, Marc Zyngier wrote: > For very long, we have kept this pointer back to the per-cpu > host state, despite having working per-cpu accessors at EL2 > for some time now. > > Recent investigations have shown that this pointer is easy > to abuse in preemptible context, which is a sure sign that > it would better be gone. Not to mention that a per-cpu > pointer is faster to access at all times. Helps to make the references to `kvm_host_data` clearer with there now being just one way to get to it and shows that it is scoped to the current CPU. A good change IMO! _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel