linux-kernel - Re: [PATCH 10/12] xen: replace callers of alloc_vm_area()/free_vm_area() with xen

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Date:	Fri, 28 Mar 2008 13:31:55 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Isaku Yamahata <yamahata@...inux.co.jp>
CC:	chrisw@...s-sol.org, sct@...hat.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, xen-ia64-devel@...ts.xensource.com,
	eddie.dong@...el.com
Subject: Re: [PATCH 10/12] xen: replace callers of alloc_vm_area()/free_vm_area()
 with xen_ prefixed one.

Isaku Yamahata wrote:
> Don't use alloc_vm_area()/free_vm_area() directly, instead define
> xen_alloc_vm_area()/xen_free_vm_area() and use them.
>
> alloc_vm_area()/free_vm_area() are used to allocate/free area which
> are for grant table mapping. Xen/x86 grant table is based on virtual
> address so that alloc_vm_area()/free_vm_area() are suitable.
> On the other hand Xen/ia64 (and Xen/powerpc) grant table is based on
> pseudo physical address (guest physical address) so that allocation
> should be done differently.
> The original version of xenified Linux/IA64 have its own
> allocate_vm_area()/free_vm_area() definitions which don't allocate vm area
> contradictory to those names.
> Now vanilla Linux already has its definitions so that it's impossible
> to have IA64 definitions of allocate_vm_area()/free_vm_area().
> Instead introduce xen_allocate_vm_area()/xen_free_vm_area() and use them.
>
> Signed-off-by: Isaku Yamahata <yamahata@...inux.co.jp>
> ---
>  drivers/xen/grant-table.c          |    2 +-
>  drivers/xen/xenbus/xenbus_client.c |    6 +++---
>  include/asm-x86/xen/hypervisor.h   |    3 +++
>  3 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index 95016fd..9fcde20 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -478,7 +478,7 @@ static int gnttab_map(unsigned int start_idx, unsigned int end_idx)
>  
>  	if (shared == NULL) {
>  		struct vm_struct *area;
> -		area = alloc_vm_area(PAGE_SIZE * max_nr_grant_frames());
> +		area = xen_alloc_vm_area(PAGE_SIZE * max_nr_grant_frames());
>  		BUG_ON(area == NULL);
>  		shared = area->addr;
>  	}
> diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
> index 9fd2f70..0f86b0f 100644
> --- a/drivers/xen/xenbus/xenbus_client.c
> +++ b/drivers/xen/xenbus/xenbus_client.c
> @@ -399,7 +399,7 @@ int xenbus_map_ring_valloc(struct xenbus_device *dev, int gnt_ref, void **vaddr)
>  
>  	*vaddr = NULL;
>  
> -	area = alloc_vm_area(PAGE_SIZE);
> +	area = xen_alloc_vm_area(PAGE_SIZE);
>  	if (!area)
>  		return -ENOMEM;
>  
> @@ -409,7 +409,7 @@ int xenbus_map_ring_valloc(struct xenbus_device *dev, int gnt_ref, void **vaddr)
>  		BUG();
>  
>  	if (op.status != GNTST_okay) {
> -		free_vm_area(area);
> +		xen_free_vm_area(area);
>  		xenbus_dev_fatal(dev, op.status,
>  				 "mapping in shared page %d from domain %d",
>  				 gnt_ref, dev->otherend_id);
> @@ -508,7 +508,7 @@ int xenbus_unmap_ring_vfree(struct xenbus_device *dev, void *vaddr)
>  		BUG();
>  
>  	if (op.status == GNTST_okay)
> -		free_vm_area(area);
> +		xen_free_vm_area(area);
>  	else
>  		xenbus_dev_error(dev, op.status,
>  				 "unmapping page at handle %d error %d",
> diff --git a/include/asm-x86/xen/hypervisor.h b/include/asm-x86/xen/hypervisor.h
> index 767a361..31e526d 100644
> --- a/include/asm-x86/xen/hypervisor.h
> +++ b/include/asm-x86/xen/hypervisor.h
> @@ -57,6 +57,9 @@ extern struct shared_info *HYPERVISOR_shared_info;
>  extern struct start_info *xen_start_info;
>  #define is_initial_xendomain() (xen_start_info->flags & SIF_INITDOMAIN)
>  
> +#define xen_alloc_vm_area(size)	alloc_vm_area(size)
> +#define xen_free_vm_area(area)	free_vm_area(area)
> +
>   

This change looks fine overall, but asm/xen/hypervisor.h seems to be 
turning into a bit of a dumping-ground.  I wonder if we can't come up 
with a better-named header...

    J
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