linux-kernel - Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS

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Message-ID: <CAFEAcA_NBvRQpuXJ2iZs_8n3b6920Z6E5ueuiAeF-4JCcqPRxQ@mail.gmail.com>
Date:   Tue, 21 Mar 2017 22:10:41 +0000
From:   Peter Maydell <peter.maydell@...aro.org>
To:     Christoffer Dall <cdall@...aro.org>
Cc:     James Morse <james.morse@....com>, kvm-devel <kvm@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
        gengdongjiu <gengdongjiu@...wei.com>, wangxiongfeng2@...wei.com,
        wuquanming@...wei.com, huangshaoyu@...wei.com,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        Andre Przywara <andre.przywara@....com>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>
Subject: Re: [PATCH] kvm: pass the virtual SEI syndrome to guest OS

On 21 March 2017 at 19:39, Christoffer Dall <cdall@...aro.org> wrote:
> My confusion here comes from not thinking about QEMU or KVM as firmware,
> but as the machine, so it would be sort of like the functionality is
> baked into hardware rather than firmware.

There is precedent for that kind of thing -- we implement PSCI
in KVM/QEMU for the guest, though in real hardware it would be
provided by firmware at EL3.

thanks
-- PMM