linux-kernel - Re: [PATCH v2 08/18] nitro_enclaves: Add logic for enclave vm creation

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Date:   Fri, 22 May 2020 09:08:28 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Andra Paraschiv <andraprs@...zon.com>
Cc:     linux-kernel@...r.kernel.org,
        Anthony Liguori <aliguori@...zon.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Balbir Singh <sblbir@...zon.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stewart Smith <trawets@...zon.com>,
        Uwe Dannowski <uwed@...zon.de>, kvm@...r.kernel.org,
        ne-devel-upstream@...zon.com
Subject: Re: [PATCH v2 08/18] nitro_enclaves: Add logic for enclave vm
 creation

On Fri, May 22, 2020 at 09:29:36AM +0300, Andra Paraschiv wrote:
> Add ioctl command logic for enclave VM creation. It triggers a slot
> allocation. The enclave resources will be associated with this slot and
> it will be used as an identifier for triggering enclave run.
> 
> Return a file descriptor, namely enclave fd. This is further used by the
> associated user space enclave process to set enclave resources and
> trigger enclave termination.
> 
> The poll function is implemented in order to notify the enclave process
> when an enclave exits without a specific enclave termination command
> trigger e.g. when an enclave crashes.
> 
> Signed-off-by: Alexandru Vasile <lexnv@...zon.com>
> Signed-off-by: Andra Paraschiv <andraprs@...zon.com>
> ---
>  drivers/virt/nitro_enclaves/ne_misc_dev.c | 169 ++++++++++++++++++++++
>  1 file changed, 169 insertions(+)
> 
> diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev.c b/drivers/virt/nitro_enclaves/ne_misc_dev.c
> index e1866fac8220..1036221238f4 100644
> --- a/drivers/virt/nitro_enclaves/ne_misc_dev.c
> +++ b/drivers/virt/nitro_enclaves/ne_misc_dev.c
> @@ -63,6 +63,146 @@ struct ne_cpu_pool {
>  
>  static struct ne_cpu_pool ne_cpu_pool;
>  
> +static int ne_enclave_open(struct inode *node, struct file *file)
> +{
> +	return 0;
> +}

Again, if a file operation does nothing, don't even provide it.

thanks,

greg k-h