linux-kernel - Re: [PATCH v11 1/2] virtio: let arch advertise guest's memory access restrictions

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Message-ID: <20200908002212.462303b4.pasic@linux.ibm.com>
Date:   Tue, 8 Sep 2020 00:22:12 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, borntraeger@...ibm.com,
        frankja@...ux.ibm.com, mst@...hat.com, jasowang@...hat.com,
        cohuck@...hat.com, kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, thomas.lendacky@....com,
        david@...son.dropbear.id.au, linuxram@...ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com
Subject: Re: [PATCH v11 1/2] virtio: let arch advertise guest's memory
 access restrictions

On Mon,  7 Sep 2020 11:39:06 +0200
Pierre Morel <pmorel@...ux.ibm.com> wrote:

> An architecture may restrict host access to guest memory,
> e.g. IBM s390 Secure Execution or AMD SEV.
> 
> Provide a new Kconfig entry the architecture can select,
> CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, when it provides
> the arch_has_restricted_virtio_memory_access callback to advertise
> to VIRTIO common code when the architecture restricts memory access
> from the host.
> 
> The common code can then fail the probe for any device where
> VIRTIO_F_ACCESS_PLATFORM is required, but not set.
> 
> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> Reviewed-by: Cornelia Huck <cohuck@...hat.com>

Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>

[..]
>  
> +config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
> +	bool
> +	help
> +	  This option is selected if the architecture may need to enforce
> +	  VIRTIO_F_IOMMU_PLATFORM.
> +

A small nit: you use F_ACCESS_PLATFORM everywhere but here.

Regards,
Halil