linux-kernel - Re: [PATCH v1 02/15] nitro_enclaves: Define the PCI device interface

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Date:   Tue, 21 Apr 2020 23:22:39 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Andra Paraschiv <andraprs@...zon.com>, linux-kernel@...r.kernel.org
Cc:     Anthony Liguori <aliguori@...zon.com>,
        Benjamin Herrenschmidt <benh@...zon.com>,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        Bjoern Doebel <doebel@...zon.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Frank van der Linden <fllinden@...zon.com>,
        Alexander Graf <graf@...zon.de>,
        Martin Pohlack <mpohlack@...zon.de>,
        Matt Wilson <msw@...zon.com>, Balbir Singh <sblbir@...zon.com>,
        Stewart Smith <trawets@...zon.com>,
        Uwe Dannowski <uwed@...zon.de>, kvm@...r.kernel.org,
        ne-devel-upstream@...zon.com
Subject: Re: [PATCH v1 02/15] nitro_enclaves: Define the PCI device interface

On 21/04/20 20:41, Andra Paraschiv wrote:
> The Nitro Enclaves (NE) driver communicates with a new PCI device, that
> is exposed to a virtual machine (VM) and handles commands meant for
> handling enclaves lifetime e.g. creation, termination, setting memory
> regions. The communication with the PCI device is handled using a MMIO
> space and MSI-X interrupts.
> 
> This device communicates with the hypervisor on the host, where the VM
> that spawned the enclave itself run, e.g. to launch a VM that is used
> for the enclave.
> 
> Define the MMIO space of the PCI device, the commands that are
> provided by this device. Add an internal data structure used as private
> data for the PCI device driver and the functions for the PCI device init
> / uninit and command requests handling.
> 
> Signed-off-by: Alexandru-Catalin Vasile <lexnv@...zon.com>
> Signed-off-by: Alexandru Ciobotaru <alcioa@...zon.com>
> Signed-off-by: Andra Paraschiv <andraprs@...zon.com>
> ---
>  .../virt/amazon/nitro_enclaves/ne_pci_dev.h   | 266 ++++++++++++++++++
>  1 file changed, 266 insertions(+)
>  create mode 100644 drivers/virt/amazon/nitro_enclaves/ne_pci_dev.h

Can this be placed just in drivers/virt/nitro_enclaves, or
drivers/virt/enclave/nitro?  It's not unlikely that this device be
implemented outside EC2 sooner or later, and there's nothing
Amazon-specific as far as I can see from the UAPI.

Paolo