On Fri, 2012-07-27 at 15:48 +0100, Stefano Stabellini wrote:
On Fri, 27 Jul 2012, Ian Campbell wrote:
On Thu, 2012-07-26 at 16:33 +0100, Stefano Stabellini wrote:
Check for a "/xen" node in the device tree, if it is present set xen_domain_type to XEN_HVM_DOMAIN and continue initialization.
Map the real shared info page using XENMEM_add_to_physmap with XENMAPSPACE_shared_info.
Signed-off-by: Stefano Stabellini stefano.stabellini@eu.citrix.com
arch/arm/xen/enlighten.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 56 insertions(+), 0 deletions(-)
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index d27c2a6..8c923af 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -5,6 +5,9 @@ #include <asm/xen/hypervisor.h> #include <asm/xen/hypercall.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> struct start_info _xen_start_info; struct start_info *xen_start_info = &_xen_start_info; @@ -33,3 +36,56 @@ int xen_remap_domain_mfn_range(struct vm_area_struct *vma, return -ENOSYS; } EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_range);
+/*
- == Xen Device Tree format ==
- /xen node;
- compatible "arm,xen";
- one interrupt for Xen event notifications;
- one memory region to map the grant_table.
- */
+static int __init xen_guest_init(void) +{
- int cpu;
- struct xen_add_to_physmap xatp;
- static struct shared_info *shared_info_page = 0;
- struct device_node *node;
- node = of_find_compatible_node(NULL, NULL, "arm,xen");
- if (!node) {
pr_info("No Xen support\n");return 0;- }
This should either only print in the success case (to avoid spamming everyone) or we need a little bit of infrastructure like on x86 so that we print exactly one of: "Booting natively on bearmetal" "Booting paravirtualised on %s", hypervisor->name
This function is only going to be called once (actually it might be called twice with the change introduced by "xen/arm: Introduce xen_guest_init").
Once (or twice), per boot, per ARM system running Linux in the world...
Ian.