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SubjectRe: [PATCH 14/24] xen/arm: initialize grant_table on ARM
On Thu, Jul 26, 2012 at 04:33:56PM +0100, Stefano Stabellini wrote:
> Initialize the grant table mapping at the address specified at index 0
> in the DT under the /xen node.

Is it always index 0? If so, should it have a #define for the
other index values?

> After the grant table is initialized, call xenbus_probe (if not dom0).
>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> ---
> arch/arm/xen/enlighten.c | 13 +++++++++++++
> drivers/xen/grant-table.c | 2 +-
> 2 files changed, 14 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 2e013cf..854af1e 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -1,8 +1,12 @@
> #include <xen/xen.h>
> #include <xen/interface/xen.h>
> #include <xen/interface/memory.h>
> +#include <xen/interface/hvm/params.h>
> #include <xen/platform_pci.h>
> #include <xen/features.h>
> +#include <xen/grant_table.h>
> +#include <xen/hvm.h>
> +#include <xen/xenbus.h>
> #include <asm/xen/hypervisor.h>
> #include <asm/xen/hypercall.h>
> #include <linux/module.h>
> @@ -51,12 +55,16 @@ int __init xen_guest_init(void)
> struct xen_add_to_physmap xatp;
> static struct shared_info *shared_info_page = 0;
> struct device_node *node;
> + struct resource res;
>
> node = of_find_compatible_node(NULL, NULL, "arm,xen");
> if (!node) {
> pr_info("No Xen support\n");
> return 0;
> }
> + if (of_address_to_resource(node, 0, &res))
> + return -EINVAL;
> + xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
> xen_domain_type = XEN_HVM_DOMAIN;
>
> xen_setup_features();
> @@ -97,6 +105,11 @@ int __init xen_guest_init(void)
> per_cpu(xen_vcpu, cpu) =
> &HYPERVISOR_shared_info->vcpu_info[cpu];
> }
> +
> + gnttab_init();
> + if (!xen_initial_domain())
> + xenbus_probe(NULL);
> +
> return 0;
> }
> EXPORT_SYMBOL_GPL(xen_guest_init);
> diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
> index 1d0d95e..fd2137a 100644
> --- a/drivers/xen/grant-table.c
> +++ b/drivers/xen/grant-table.c
> @@ -62,7 +62,7 @@
>
> static grant_ref_t **gnttab_list;
> static unsigned int nr_grant_frames;
> -static unsigned int boot_max_nr_grant_frames;
> +static unsigned int boot_max_nr_grant_frames = 1;

Is this going to impact x86 version?

> static int gnttab_free_count;
> static grant_ref_t gnttab_free_head;
> static DEFINE_SPINLOCK(gnttab_list_lock);
> --
> 1.7.2.5


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