linux-kernel - Re: [PATCH v3] PCI: vmd: Honor ACPI

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Message-ID: <YgyyVtDVV+0Jrogi@infradead.org>
Date:   Wed, 16 Feb 2022 00:14:14 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Keith Busch <kbusch@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Nirmal Patel <nirmal.patel@...ux.intel.com>,
        Jonathan Derrick <jonathan.derrick@...ux.dev>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] PCI: vmd: Honor ACPI _OSC on PCIe features

On Tue, Feb 15, 2022 at 07:53:03PM -0600, Bjorn Helgaas wrote:
> Apparently there's a firmware toggle, but I don't know exactly what it
> does.  Maybe if the toggle is set to disable VMD, the VMD device looks
> like a regular Root Port and the devices below are enumerated
> normally even without any vmd.c?

Yes.  VMD is just an intel invention to make the OSes life incredibly
painful (and to allow Intel to force binding their NVMe driver instead
of the Microsoft one on windows).