linux-kernel - Re: [PATCH v2 10/20] xen/xenbus: Use Xen page definition

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Date:	Thu, 16 Jul 2015 16:35:56 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Julien Grall <julien.grall@...rix.com>
CC:	<xen-devel@...ts.xenproject.org>,
	<linux-arm-kernel@...ts.infradead.org>, <ian.campbell@...rix.com>,
	<stefano.stabellini@...citrix.com>, <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"David Vrabel" <david.vrabel@...rix.com>
Subject: Re: [PATCH v2 10/20] xen/xenbus: Use Xen page definition

On Thu, 9 Jul 2015, Julien Grall wrote:
> All the ring (xenstore, and PV rings) are always based on the page
> granularity of Xen.
> 
> Signed-off-by: Julien Grall <julien.grall@...rix.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: David Vrabel <david.vrabel@...rix.com>

Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>


>     Changes in v2:
>         - Also update the ring mapping function
> ---
>  drivers/xen/xenbus/xenbus_client.c | 6 +++---
>  drivers/xen/xenbus/xenbus_probe.c  | 4 ++--
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
> index 9ad3272..80272f6 100644
> --- a/drivers/xen/xenbus/xenbus_client.c
> +++ b/drivers/xen/xenbus/xenbus_client.c
> @@ -388,7 +388,7 @@ int xenbus_grant_ring(struct xenbus_device *dev, void *vaddr,
>  		}
>  		grefs[i] = err;
>  
> -		vaddr = vaddr + PAGE_SIZE;
> +		vaddr = vaddr + XEN_PAGE_SIZE;
>  	}
>  
>  	return 0;
> @@ -555,7 +555,7 @@ static int xenbus_map_ring_valloc_pv(struct xenbus_device *dev,
>  	if (!node)
>  		return -ENOMEM;
>  
> -	area = alloc_vm_area(PAGE_SIZE * nr_grefs, ptes);
> +	area = alloc_vm_area(XEN_PAGE_SIZE * nr_grefs, ptes);
>  	if (!area) {
>  		kfree(node);
>  		return -ENOMEM;
> @@ -750,7 +750,7 @@ static int xenbus_unmap_ring_vfree_pv(struct xenbus_device *dev, void *vaddr)
>  		unsigned long addr;
>  
>  		memset(&unmap[i], 0, sizeof(unmap[i]));
> -		addr = (unsigned long)vaddr + (PAGE_SIZE * i);
> +		addr = (unsigned long)vaddr + (XEN_PAGE_SIZE * i);
>  		unmap[i].host_addr = arbitrary_virt_to_machine(
>  			lookup_address(addr, &level)).maddr;
>  		unmap[i].dev_bus_addr = 0;
> diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
> index 4308fb3..c67e5ba 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -713,7 +713,7 @@ static int __init xenstored_local_init(void)
>  
>  	xen_store_mfn = xen_start_info->store_mfn =
>  		pfn_to_mfn(virt_to_phys((void *)page) >>
> -			   PAGE_SHIFT);
> +			   XEN_PAGE_SHIFT);
>  
>  	/* Next allocate a local port which xenstored can bind to */
>  	alloc_unbound.dom        = DOMID_SELF;
> @@ -804,7 +804,7 @@ static int __init xenbus_init(void)
>  			goto out_error;
>  		xen_store_mfn = (unsigned long)v;
>  		xen_store_interface =
> -			xen_remap(xen_store_mfn << PAGE_SHIFT, PAGE_SIZE);
> +			xen_remap(xen_store_mfn << XEN_PAGE_SHIFT, XEN_PAGE_SIZE);
>  		break;
>  	default:
>  		pr_warn("Xenstore state unknown\n");
> -- 
> 2.1.4
> 
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