linux-kernel - Re: [PATCH v2 04/15] kvm: x86: Add per-VM APICv state debugfs

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Message-ID: <a48080a5-7ece-280d-2c1f-9d3f4c273a8d@amazon.com>
Date:   Mon, 19 Aug 2019 11:57:13 +0200
From:   Alexander Graf <graf@...zon.com>
To:     "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "jschoenh@...zon.de" <jschoenh@...zon.de>,
        "karahmed@...zon.de" <karahmed@...zon.de>,
        "rimasluk@...zon.com" <rimasluk@...zon.com>,
        "Grimm, Jon" <Jon.Grimm@....com>
Subject: Re: [PATCH v2 04/15] kvm: x86: Add per-VM APICv state debugfs



On 15.08.19 18:25, Suthikulpanit, Suravee wrote:
> Currently, there is no way to tell whether APICv is active
> on a particular VM. This often cause confusion since APICv
> can be deactivated at runtime.
> 
> Introduce a debugfs entry to report APICv state of a VM.
> This creates a read-only file:
> 
>     /sys/kernel/debug/kvm/70860-14/apicv-state
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>

Shouldn't this first and foremost be a VM ioctl so that user space can 
inquire its own state?


Alex