linux-kernel - Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR region in VMA

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Message-ID: <22e592c5-58e5-5456-311d-3d23303a91ac@nvidia.com>
Date:   Mon, 3 May 2021 07:08:15 -0500
From:   Shanker R Donthineni <sdonthineni@...dia.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Vikram Sethi <vsethi@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jason Sequeira <jsequeira@...dia.com>
Subject: Re: [RFC 1/2] vfio/pci: keep the prefetchable attribute of a BAR
 region in VMA

Hi Marc,

On 5/3/21 4:50 AM, Marc Zyngier wrote:
> You are mixing two things: what Linux/arm64 gives to kernel drivers,
> and what KVM, as an implementation of the ARMv8 architecture, gives to
> virtual machines. There is zero reason for the two to match if there
> is no definition of what we need to provide.
Suggestion here is memory-types PROT_NORMAL_NC and PROT_DEVICE_nGnRE
are applicable to braemetal only and don't use for device memory inside VM.