linux-kernel - Re: [PATCH v4 14/24] xen/arm: initialize grant

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Message-ID: <20120914131033.GM25249@phenom.dumpdata.com>
Date:	Fri, 14 Sep 2012 09:10:33 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	arnd@...db.de, linux@....linux.org.uk, catalin.marinas@....com,
	linaro-dev@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
	tim@....org, Ian.Campbell@...rix.com,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 14/24] xen/arm: initialize grant_table on ARM

On Fri, Sep 14, 2012 at 12:13:16PM +0100, Stefano Stabellini wrote:
> Initialize the grant table mapping at the address specified at index 0
> in the DT under the /xen node.
> After the grant table is initialized, call xenbus_probe (if not dom0).

So we don't really care about the grant's size then? The DT xen.txt
talks about it..
> 
> Changes in v2:
> 
> - introduce GRANT_TABLE_PHYSADDR;
> - remove unneeded initialization of boot_max_nr_grant_frames.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> ---
>  arch/arm/xen/enlighten.c |   14 ++++++++++++++
>  1 files changed, 14 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index c2a47a7..036a4d8 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -1,8 +1,12 @@
>  #include <xen/xen.h>
> +#include <xen/grant_table.h>
> +#include <xen/hvm.h>
>  #include <xen/interface/xen.h>
>  #include <xen/interface/memory.h>
> +#include <xen/interface/hvm/params.h>
>  #include <xen/features.h>
>  #include <xen/platform_pci.h>
> +#include <xen/xenbus.h>
>  #include <asm/xen/hypervisor.h>
>  #include <asm/xen/hypercall.h>
>  #include <linux/module.h>
> @@ -42,6 +46,7 @@ EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
>   * see Documentation/devicetree/bindings/arm/xen.txt for the
>   * documentation of the Xen Device Tree format.
>   */
> +#define GRANT_TABLE_PHYSADDR 0
>  static int __init xen_guest_init(void)
>  {
>  	struct xen_add_to_physmap xatp;
> @@ -51,6 +56,7 @@ static int __init xen_guest_init(void)
>  	const char *s = NULL;
>  	const char *version = NULL;
>  	const char *xen_prefix = "xen,xen-";
> +	struct resource res;
>  
>  	node = of_find_compatible_node(NULL, NULL, "xen,xen");
>  	if (!node) {
> @@ -65,6 +71,9 @@ static int __init xen_guest_init(void)
>  		pr_debug("Xen version not found\n");
>  		return 0;
>  	}
> +	if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
> +		return 0;
> +	xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
>  	xen_domain_type = XEN_HVM_DOMAIN;
>  
>  	xen_setup_features();
> @@ -98,6 +107,11 @@ static int __init xen_guest_init(void)
>  	 * is required to use VCPUOP_register_vcpu_info to place vcpu info
>  	 * for secondary CPUs as they are brought up. */
>  	per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
> +
> +	gnttab_init();
> +	if (!xen_initial_domain())
> +		xenbus_probe(NULL);
> +
>  	return 0;
>  }
>  core_initcall(xen_guest_init);
> -- 
> 1.7.2.5
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