linux-kernel - Re: arm64 kvm built with clang doesn't boot

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Message-ID: <2e84a842-96e8-aec4-8b85-9ee879bb323a@arm.com>
Date:   Fri, 16 Mar 2018 15:00:38 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Stephen Hines <srhines@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        kvmarm@...ts.cs.columbia.edu, LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        kernel-dynamic-tools <kernel-dynamic-tools@...gle.com>
Subject: Re: arm64 kvm built with clang doesn't boot

On 16/03/18 14:53, Andrey Konovalov wrote:
> On Fri, Mar 16, 2018 at 3:13 PM, Marc Zyngier <marc.zyngier@....com> wrote:
>> I wasn't aware of that discussion, but this is indeed quite annoying.
>> Note that you should be able to restrict this to arch/arm64/kvm/hyp/*
>> and virt/kvm/arm/hyp/*.
> 
> That works as well (tried it, the kernel boots). I've also tried
> compiling without the flag for virt/kvm/arm/hyp/*, it boots as well.

That's just luck. Anything in a hyp/ directory has the potential to be
executed at EL2, and thus could be generating these jump tables. It
could blow up at a later time, once you start running VMs...

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