linux-kernel - Re: [PATCH v2] arm64: KVM: Use SMCCC_ARCH_WORKAROUND

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Date:   Fri, 9 Mar 2018 13:48:09 +0000
From:   Will Deacon <will.deacon@....com>
To:     Shanker Donthineni <shankerd@...eaurora.org>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        Christoffer Dall <cdall@...nel.org>,
        Vikram Sethi <vikrams@...eaurora.org>,
        Sean Campbell <scampbel@...eaurora.org>,
        Thomas Speier <tspeier@...eaurora.org>
Subject: Re: [PATCH v2] arm64: KVM: Use SMCCC_ARCH_WORKAROUND_1 for Falkor BP
 hardening

Hi SHanker,

On Mon, Mar 05, 2018 at 11:06:43AM -0600, Shanker Donthineni wrote:
> The function SMCCC_ARCH_WORKAROUND_1 was introduced as part of SMC
> V1.1 Calling Convention to mitigate CVE-2017-5715. This patch uses
> the standard call SMCCC_ARCH_WORKAROUND_1 for Falkor chips instead
> of Silicon provider service ID 0xC2001700.
> 
> Signed-off-by: Shanker Donthineni <shankerd@...eaurora.org>
> ---
> Chnages since v1:
>   - Trivial change in cpucaps.h (refresh after removing ARM64_HARDEN_BP_POST_GUEST_EXIT)
> 
>  arch/arm64/include/asm/cpucaps.h |  5 ++--
>  arch/arm64/include/asm/kvm_asm.h |  2 --
>  arch/arm64/kernel/bpi.S          |  8 ------
>  arch/arm64/kernel/cpu_errata.c   | 55 ++++++++++++++--------------------------
>  arch/arm64/kvm/hyp/entry.S       | 12 ---------
>  arch/arm64/kvm/hyp/switch.c      | 10 --------
>  6 files changed, 21 insertions(+), 71 deletions(-)

Could you reply to my outstanding question on the last version of this patch
please?

http://lists.infradead.org/pipermail/linux-arm-kernel/2018-March/564194.html

Will