[Xen-devel] [PATCH v4 11/17] ARM: XEN: Move xen_early_init() before efi_init()

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Move xen_early_init() before efi_init(), then when calling efi_init()
could initialize Xen specific UEFI.

Check if it runs on Xen hypervisor through the flat dts.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 arch/arm/xen/enlighten.c  | 56 ++++++++++++++++++++++++++++++++++-------------
 arch/arm64/kernel/setup.c |  2 +-
 2 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 807a93e..0e542b8 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -20,6 +20,7 @@
 #include <linux/irqreturn.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_fdt.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
 #include <linux/cpuidle.h>
@@ -53,8 +54,6 @@ struct xen_memory_region 
xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
 
 static __read_mostly unsigned int xen_events_irq;
 
-static __initdata struct device_node *xen_node;
-
 int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
                               unsigned long addr,
                               xen_pfn_t *gfn, int nr,
@@ -238,6 +237,33 @@ static irqreturn_t xen_arm_callback(int irq, void *arg)
        return IRQ_HANDLED;
 }
 
+static __initdata struct {
+       const char *compat;
+       const char *prefix;
+       const char *version;
+       bool found;
+} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
+
+static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
+                                     int depth, void *data)
+{
+       const void *s = NULL;
+       int len;
+
+       if (depth != 1 || strcmp(uname, "hypervisor") != 0)
+               return 0;
+
+       if (of_flat_dt_is_compatible(node, hyper_node.compat))
+               hyper_node.found = true;
+
+       s = of_get_flat_dt_prop(node, "compatible", &len);
+       if (strlen(hyper_node.prefix) + 3  < len &&
+           !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
+               hyper_node.version = s + strlen(hyper_node.prefix);
+
+       return 0;
+}
+
 /*
  * see Documentation/devicetree/bindings/arm/xen.txt for the
  * documentation of the Xen Device Tree format.
@@ -245,26 +271,18 @@ static irqreturn_t xen_arm_callback(int irq, void *arg)
 #define GRANT_TABLE_PHYSADDR 0
 void __init xen_early_init(void)
 {
-       int len;
-       const char *s = NULL;
-       const char *version = NULL;
-       const char *xen_prefix = "xen,xen-";
-
-       xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
-       if (!xen_node) {
+       of_scan_flat_dt(fdt_find_hyper_node, NULL);
+       if (!hyper_node.found) {
                pr_debug("No Xen support\n");
                return;
        }
-       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) {
+
+       if (hyper_node.version == NULL) {
                pr_debug("Xen version not found\n");
                return;
        }
 
-       pr_info("Xen %s support found\n", version);
+       pr_info("Xen %s support found\n", hyper_node.version);
 
        xen_domain_type = XEN_HVM_DOMAIN;
 
@@ -305,6 +323,14 @@ static void __init xen_acpi_guest_init(void)
 
 static void __init xen_dt_guest_init(void)
 {
+       struct device_node *xen_node;
+
+       xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
+       if (!xen_node) {
+               pr_err("Xen support was detected before, but it has 
disappeared\n");
+               return;
+       }
+
        xen_events_irq = irq_of_parse_and_map(xen_node, 0);
 }
 
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 8119479..a4a2878 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -313,6 +313,7 @@ void __init setup_arch(char **cmdline_p)
         */
        local_async_enable();
 
+       xen_early_init();
        efi_init();
        arm64_memblock_init();
 
@@ -334,7 +335,6 @@ void __init setup_arch(char **cmdline_p)
        } else {
                psci_acpi_init();
        }
-       xen_early_init();
 
        cpu_read_bootcpu_ops();
        smp_init_cpus();
-- 
2.0.4



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