linux-kernel - Re: [PATCH v6 10/10] arm64: Retrieve stolen time as paravirtualized guest

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Message-ID: <e8fa44e1e6bcb58ea07b5064ed40e088@www.loen.fr>
Date:   Mon, 21 Oct 2019 08:55:50 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Jürgen Groß <jgross@...e.com>
Cc:     Steven Price <steven.price@....com>, Will Deacon <will@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Pouloze <suzuki.poulose@....com>,
        Mark Rutland <mark.rutland@....com>, <kvm@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 10/10] arm64: Retrieve stolen time as paravirtualized  guest

On 2019-10-21 06:01, Jürgen Groß wrote:
> On 19.10.19 22:28, Marc Zyngier wrote:

>> How about something like pv_time_init() instead? In the guest, this 
>> is
>> no way KVM specific, and I still hope for this to work on things 
>> like
>> Xen/HyperV/VMware (yeah, I'm foolishly optimistic). All the 
>> references
>> to KVM should go, and be replaced by something more generic (after
>> all, you're only implementing the spec, so feel free to call it
>> den0057_* if you really want).
>
> Xen guests already have the needed functionality. On ARM this just 
> needs
> to be hooked up.

Yes, Xen offers its own PV interface for that. But this code is about
implementing support for a cross hypervisor functionnality (which 
AFAICT
is not implemented by Xen).

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