linux-kernel - Re: [PATCH RFC v2 1/5] virtio_config: add page_size field to virtio_shm

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Message-ID: <29100f93-a7e6-4c81-ac83-af94ecd942a1@collabora.com>
Date: Thu, 20 Feb 2025 06:07:09 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Sergio Lopez <slp@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>,
 Daniel Verkamp <dverkamp@...omium.org>, Jason Wang <jasowang@...hat.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...hat.com>, David Airlie <airlied@...hat.com>,
 Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Simona Vetter <simona@...ll.ch>, Rob Clark <robdclark@...il.com>,
 fnkl.kernel@...il.com
Cc: virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH RFC v2 1/5] virtio_config: add page_size field to
 virtio_shm_region

On 2/14/25 18:16, Sergio Lopez wrote:
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 5d78c2d572abfcfe2b84cdd82df622320fe97d5d..1f594b626d7a7734e8ec58766737a118c26bad94 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -560,6 +560,8 @@ static bool vm_get_shm_region(struct virtio_device *vdev,
>  
>  	region->addr = addr;
>  
> +	region->page_size = 4096;
> +
>  	return true;
>  }
>  
> diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> index 5eaade7578606e4b02af0d66447417ad6aa11064..d7aeb2e50a3c499dfb68d58cb89b829ea2e50454 100644
> --- a/drivers/virtio/virtio_pci_modern.c
> +++ b/drivers/virtio/virtio_pci_modern.c
> @@ -862,6 +862,7 @@ static bool vp_get_shm_region(struct virtio_device *vdev,
>  
>  	region->len = len;
>  	region->addr = (u64) phys_addr + offset;
> +	region->page_size = 4096;
>  
>  	return true;
>  }
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index 169c7d367facb36dcabf9596068580ea8b8516c7..c1b2ce71ea55e81978e18db05494deab193fa4fb 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -14,6 +14,7 @@ struct irq_affinity;
>  struct virtio_shm_region {
>  	u64 addr;
>  	u64 len;
> +	u32 page_size;
>  };

Nit: I'd squash this into patches #3/4, to not add code that is changed
by a next patch.

-- 
Best regards,
Dmitry