From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: Re: [PATCH v3 00/23] arm64: Virtualization Host Extension support Date: Fri, 5 Feb 2016 08:56:00 +0000 Message-ID: <56B463A0.7010801@arm.com> References: <1454522416-6874-1-git-send-email-marc.zyngier@arm.com> <20160204192641.GJ13974@cbox> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org To: Christoffer Dall Return-path: In-Reply-To: <20160204192641.GJ13974@cbox> 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 04/02/16 19:26, Christoffer Dall wrote: > On Wed, Feb 03, 2016 at 05:59:53PM +0000, Marc Zyngier wrote: >> ARMv8.1 comes with the "Virtualization Host Extension" (VHE for >> short), which enables simpler support of Type-2 hypervisors. >> >> This extension allows the kernel to directly run at EL2, and >> significantly reduces the number of system registers shared between >> host and guest, reducing the overhead of virtualization. >> >> In order to have the same kernel binary running on all versions of the >> architecture, this series makes heavy use of runtime code patching. >> >> The first 22 patches massage the KVM code to deal with VHE and enable >> Linux to run at EL2. The last patch catches an ugly case when VHE >> capable CPUs are paired with some of their less capable siblings. This >> should never happen, but hey... >> >> I have deliberately left out some of the more "advanced" >> optimizations, as they are likely to distract the reviewer from the >> core infrastructure, which is what I care about at the moment. >> >> Note: GDB is currently busted on VHE systems, as it checks for version >> 6 on the debug architecture, while VHE is version 7. The >> binutils people are on the case. >> >> This has been tested on the FVP_Base_SLV-V8-A model, and based on >> v4.5-rc2. I've put a branch out on: >> >> git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe >> > > You can have my reviewed-by on all patches that I didn't already review > or ack explicitly. Thanks for the review, much appreciated. > Only exception is the debug stuff where I didn't manage to page in the > context, so hopefully familiar with that code can have a look. I think this will have to be Mr Deacon. Thanks again, M. -- Jazz is not dead. It just smells funny...