linux-kernel - RE: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection

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Message-ID: <30928722afe64104b5abba09de4f74dd@intel.com>
Date:   Fri, 13 Nov 2020 16:12:39 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Wilk, Konrad" <konrad.wilk@...cle.com>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "Dey, Megha" <megha.dey@...el.com>,
        "maz@...nel.org" <maz@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "Lu, Baolu" <baolu.lu@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "netanelg@...lanox.com" <netanelg@...lanox.com>,
        "shahafs@...lanox.com" <shahafs@...lanox.com>,
        "yan.y.zhao@...ux.intel.com" <yan.y.zhao@...ux.intel.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Ortiz, Samuel" <samuel.ortiz@...el.com>,
        "Hossain, Mona" <mona.hossain@...el.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Marc Zyngier <maz@...nel.org>
Subject: RE: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection

> Of course is this not only an x86 problem. Every architecture which
> supports virtualization has the same issue. ARM(64) has no way to tell
> for sure whether the machine runs bare metal either. No idea about the
> other architectures.

Sounds like a hypervisor problem. If the VMM provides perfect emulation
of every weird quirk of h/w, then it is OK to let the guest believe that it is
running on bare metal.

If it isn't perfect, then it should make sure the guest knows *for sure*, so that
the guest can take appropriate actions to avoid the sharp edges.

-Tony