linux-kernel - Re: [PATCH v9 2/2] s390: virtio: PV needs VIRTIO I/O device protection

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Date:   Fri, 21 Aug 2020 14:05:10 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, pasic@...ux.ibm.com,
        borntraeger@...ibm.com, frankja@...ux.ibm.com, mst@...hat.com,
        jasowang@...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 v9 2/2] s390: virtio: PV needs VIRTIO I/O device
 protection

On Wed, 19 Aug 2020 18:23:18 +0200
Pierre Morel <pmorel@...ux.ibm.com> wrote:

> If protected virtualization is active on s390, VIRTIO has retricted

s/retricted/only restricted/

> access to the guest memory.
> Define CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS and export
> arch_has_restricted_virtio_memory_access to advertize VIRTIO if that's
> the case, preventing a host error on access attempt.
> 
> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> ---
>  arch/s390/Kconfig   |  1 +
>  arch/s390/mm/init.c | 11 +++++++++++
>  2 files changed, 12 insertions(+)

(...)

> diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
> index 6dc7c3b60ef6..8febd73ed6ca 100644
> --- a/arch/s390/mm/init.c
> +++ b/arch/s390/mm/init.c
> @@ -45,6 +45,7 @@
>  #include <asm/kasan.h>
>  #include <asm/dma-mapping.h>
>  #include <asm/uv.h>
> +#include <linux/virtio_config.h>

I don't think you need this include anymore.

>  
>  pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
>  

(...)

With the nit fixed,

Reviewed-by: Cornelia Huck <cohuck@...hat.com>