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    SubjectRe: [PATCH v4 00/23] arm64: Virtualization Host Extension support
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    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.

    Thanks,

    M.
    --
    Jazz is not dead. It just smells funny...

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