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
- xen_domain_type = XEN_HVM_DOMAIN;
- if (!shared_info_page)
shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);- if (!shared_info_page) {
pr_err("not enough memory");return -ENOMEM;- }
- xatp.domid = DOMID_SELF;
- xatp.idx = 0;
- xatp.space = XENMAPSPACE_shared_info;
- xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
- if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();- HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
- /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
* page, we use it in the event channel upcall and in some pvclock* related functions. We don't need the vcpu_info placement* optimizations because we don't use any pv_mmu or pv_irq op on* HVM.* When xen_hvm_init_shared_info is run at boot time only vcpu 0 is* online but xen_hvm_init_shared_info is run at resume time too and* in that case multiple vcpus might be online. */- for_each_online_cpu(cpu) {
per_cpu(xen_vcpu, cpu) =&HYPERVISOR_shared_info->vcpu_info[cpu];
On ARM the shared info contains exactly 1 CPU (the boot CPU). The guest is required to use VCPUOP_register_vcpu_info to place vcpu info for secondary CPUs as they are brought up.
Ian.