On 15/02/16 10:23, Catalin Marinas wrote: > On Thu, Feb 11, 2016 at 07:10:50PM +0000, Marc Zyngier wrote: >> On 11/02/16 19:07, Christoffer Dall wrote: >>> On Thu, Feb 11, 2016 at 06:39:41PM +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-rc3 + kvmarm/master. I've put a branch out on: >>>> >>>> git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git kvm-arm64/vhe >>> >>> I'm happy with this series as it stands, we just need someone to take a >>> look at that debug patch and be happy with it. >> >> I think Will is planning to have a go at it shortly. Once he and Catalin >> are happy with the thing, I'll throw it into -next for a good shake. > > Fine by me but it would be good for Will to have a look, especially on > the debug and perf stuff. Definitely. To make it clear, I do not intend to put anything in -next until all the relevant people has reviewed it, and at least given their Ack. Thanks, M. -- Jazz is not dead. It just smells funny... -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
