Re: [PATCH v4 00/17] arm64: Add SMCCC v1.1 support and CVE-2017-5715 (Spectre variant 2) mitigation

[Catalin Marinas]

On Tue, Feb 06, 2018 at 05:56:04PM +0000, Marc Zyngier wrote:
> ARM has recently published a SMC Calling Convention (SMCCC)
> specification update[1] that provides an optimised calling convention
> and optional, discoverable support for mitigating CVE-2017-5715. ARM
> Trusted Firmware (ATF) has already gained such an implementation[2].
> 
> This series addresses a few things:
> 
> - It provides a KVM implementation of PSCI v1.0, which is a
>   prerequisite for being able to discover SMCCC v1.1.
> 
> - It allows KVM to advertise SMCCC v1.1, which is de-facto supported
>   already (it never corrupts any of the guest registers).
> 
> - It implements KVM support for the ARCH_WORKAROUND_1 function that is
>   used to mitigate CVE-2017-5715 in a guest (if such mitigation is
>   available on the host).
> 
> - It implements SMCCC v1.1 and ARCH_WORKAROUND_1 discovery support in
>   the kernel itself.
> 
> - It finally provides firmware callbacks for CVE-2017-5715 for both
>   kernel and KVM and drop the initial PSCI_GET_VERSION based
>   mitigation.
> 
> Patch 1 is already merged, and included here for reference. Patches on
> top of arm64/for-next/core. Tested on Seattle and Juno, the latter
> with ATF implementing SMCCC v1.1.

Queued for 4.16. I merged the first patch as well since for-next/core is
based on -rc3 and the patch went in afterwards (I dropped cc stable
since there is a version with this tag already).

Thanks.

-- 
Catalin