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. -- Catalin -- 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
