[PATCH v5 00/34] arm/arm64: KVM: Rework the hyp-stub API

Christoffer Dall cdall at linaro.org
Tue Apr 4 05:04:05 PDT 2017

Hi Marc,

On Mon, Apr 03, 2017 at 07:37:33PM +0100, Marc Zyngier wrote:
> As noticed by RMK in this thread[1], the hyp-stub API on 32bit ARM
> could do with some TLC (it cannot perform a soft-restart at HYP, and
> has holes in the hyp-stub support in a number of places). In general,
> it would be desirable for the 32bit behaviour to align on 64bit, if
> only to ease maintenance.
> This series implements the following:
> - Add HVC_[GS]ET_VECTORS and HVC_SOFT_RESTART to the 32bit code
> - Add HVC_RESET_VECTORS to both arm and arm64, removing the need for
>   __hyp_reset_vectors
> - Implement add the stub entry points in the KVM init code, which
>   didn't implement any so far
> - Convert the HYP code to use the init code stubs directly
> - Some general cleanup as a result of these changes (which includes
>   killing HVC_GET_VECTORS)
> - Add some API documentation that covers the above
> Patches 14 to 16 would be better squashed into 12 and 13, but I've
> kept them separate so that I can take the blame for everything I've
> broken.
> I've tested this on arm (Cubietruck, Jetson TK1) and arm64 (Seattle),
> both as host and guest. Keerthy has been kind enough to test the 32bit
> code on DRA7-EVM, AM57XX-EVM and KEYSTONE-K2E-EVM.
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-December/473472.html
> * From v4:
>   - Added a standard return value on stub hypercall failure
>   - Zero r0/x0 on successful hypercall
>   - Make 32bit ARM resistant to kvm_reboot while executing a guest
>   - Update documentation to reflect the calling convention expectations
>   - Added Acks from Catalin
>   - Rebased on 4.11-rc5

Thanks for doing the changes.

I have applied your patches to kvmarm/queue.


More information about the linux-arm-kernel mailing list