Commit 5882bfef authored by Stefano Stabellini's avatar Stefano Stabellini Committed by David Vrabel
Browse files

arm,arm64/xen: move Xen initialization earlier

Currently, Xen is initialized/discovered in an initcall. This doesn't
allow us to support earlyprintk or choosing the preferred console when
running on Xen.

The current function xen_guest_init is now split in 2 parts:
    - xen_early_init: Check if there is a Xen node in the device tree
    and setup domain type
    - xen_guest_init: Retrieve the information from the device node and
    initialize Xen (grant table, shared page...)

The former is called in setup_arch, while the latter is an initcall.
Signed-off-by: default avatarStefano Stabellini <>
Signed-off-by: default avatarJulien Grall <>
Acked-by: default avatarIan Campbell <>
Acked-by: default avatarWill Deacon <>
parent 81e863c3
#include <linux/init.h>
extern struct shared_info *HYPERVISOR_shared_info;
extern struct start_info *xen_start_info;
......@@ -18,4 +20,10 @@ static inline enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
extern struct dma_map_ops *xen_dma_ops;
void __init xen_early_init(void);
static inline void xen_early_init(void) { return; }
......@@ -46,6 +46,7 @@
#include <asm/cacheflush.h>
#include <asm/cachetype.h>
#include <asm/tlbflush.h>
#include <asm/xen/hypervisor.h>
#include <asm/prom.h>
#include <asm/mach/arch.h>
......@@ -951,6 +952,7 @@ void __init setup_arch(char **cmdline_p)
if (is_smp()) {
if (!mdesc->smp_init || !mdesc->smp_init()) {
......@@ -53,6 +53,8 @@ EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
static __read_mostly unsigned int xen_events_irq;
static __initdata struct device_node *xen_node;
int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
unsigned long addr,
xen_pfn_t *mfn, int nr,
......@@ -150,42 +152,28 @@ static irqreturn_t xen_arm_callback(int irq, void *arg)
* documentation of the Xen Device Tree format.
static int __init xen_guest_init(void)
void __init xen_early_init(void)
struct xen_add_to_physmap xatp;
static struct shared_info *shared_info_page = 0;
struct device_node *node;
int len;
const char *s = NULL;
const char *version = NULL;
const char *xen_prefix = "xen,xen-";
struct resource res;
phys_addr_t grant_frames;
node = of_find_compatible_node(NULL, NULL, "xen,xen");
if (!node) {
xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
if (!xen_node) {
pr_debug("No Xen support\n");
return 0;
s = of_get_property(node, "compatible", &len);
s = of_get_property(xen_node, "compatible", &len);
if (strlen(xen_prefix) + 3 < len &&
!strncmp(xen_prefix, s, strlen(xen_prefix)))
version = s + strlen(xen_prefix);
if (version == NULL) {
pr_debug("Xen version not found\n");
return 0;
if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
return 0;
grant_frames = res.start;
xen_events_irq = irq_of_parse_and_map(node, 0);
if (!xen_events_irq) {
pr_debug("Xen event channel interrupt not found\n");
return -ENODEV;
pr_info("Xen %s support found, events_irq=%d gnttab_frame=%pa\n",
version, xen_events_irq, &grant_frames);
pr_info("Xen %s support found\n", version);
xen_domain_type = XEN_HVM_DOMAIN;
......@@ -195,10 +183,32 @@ static int __init xen_guest_init(void)
xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
static int __init xen_guest_init(void)
struct xen_add_to_physmap xatp;
struct shared_info *shared_info_page = NULL;
struct resource res;
phys_addr_t grant_frames;
if (!xen_domain())
return 0;
if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
pr_err("Xen grant table base address not found\n");
return -ENODEV;
grant_frames = res.start;
xen_events_irq = irq_of_parse_and_map(xen_node, 0);
if (!xen_events_irq) {
pr_err("Xen event channel interrupt not found\n");
return -ENODEV;
shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
if (!shared_info_page)
shared_info_page = (struct shared_info *)
if (!shared_info_page) {
pr_err("not enough memory\n");
return -ENOMEM;
......@@ -64,6 +64,7 @@
#include <asm/psci.h>
#include <asm/efi.h>
#include <asm/virt.h>
#include <asm/xen/hypervisor.h>
unsigned long elf_hwcap __read_mostly;
......@@ -416,6 +417,7 @@ void __init setup_arch(char **cmdline_p)
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment