Merge commit 'v2.6.36-rc3' into x86/memblock
[linux-3.10.git] / arch / x86 / xen / setup.c
index 2ac8f29..9729c90 100644 (file)
@@ -21,6 +21,7 @@
 #include <xen/page.h>
 #include <xen/interface/callback.h>
 #include <xen/interface/physdev.h>
+#include <xen/interface/memory.h>
 #include <xen/features.h>
 
 #include "xen-ops.h"
@@ -33,6 +34,73 @@ extern void xen_sysenter_target(void);
 extern void xen_syscall_target(void);
 extern void xen_syscall32_target(void);
 
+static unsigned long __init xen_release_chunk(phys_addr_t start_addr,
+                                             phys_addr_t end_addr)
+{
+       struct xen_memory_reservation reservation = {
+               .address_bits = 0,
+               .extent_order = 0,
+               .domid        = DOMID_SELF
+       };
+       unsigned long start, end;
+       unsigned long len = 0;
+       unsigned long pfn;
+       int ret;
+
+       start = PFN_UP(start_addr);
+       end = PFN_DOWN(end_addr);
+
+       if (end <= start)
+               return 0;
+
+       printk(KERN_INFO "xen_release_chunk: looking at area pfn %lx-%lx: ",
+              start, end);
+       for(pfn = start; pfn < end; pfn++) {
+               unsigned long mfn = pfn_to_mfn(pfn);
+
+               /* Make sure pfn exists to start with */
+               if (mfn == INVALID_P2M_ENTRY || mfn_to_pfn(mfn) != pfn)
+                       continue;
+
+               set_xen_guest_handle(reservation.extent_start, &mfn);
+               reservation.nr_extents = 1;
+
+               ret = HYPERVISOR_memory_op(XENMEM_decrease_reservation,
+                                          &reservation);
+               WARN(ret != 1, "Failed to release memory %lx-%lx err=%d\n",
+                    start, end, ret);
+               if (ret == 1) {
+                       set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
+                       len++;
+               }
+       }
+       printk(KERN_CONT "%ld pages freed\n", len);
+
+       return len;
+}
+
+static unsigned long __init xen_return_unused_memory(unsigned long max_pfn,
+                                                    const struct e820map *e820)
+{
+       phys_addr_t max_addr = PFN_PHYS(max_pfn);
+       phys_addr_t last_end = 0;
+       unsigned long released = 0;
+       int i;
+
+       for (i = 0; i < e820->nr_map && last_end < max_addr; i++) {
+               phys_addr_t end = e820->map[i].addr;
+               end = min(max_addr, end);
+
+               released += xen_release_chunk(last_end, end);
+               last_end = e820->map[i].addr + e820->map[i].size;
+       }
+
+       if (last_end < max_addr)
+               released += xen_release_chunk(last_end, max_addr);
+
+       printk(KERN_INFO "released %ld pages of unused memory\n", released);
+       return released;
+}
 
 /**
  * machine_specific_memory_setup - Hook for machine specific memory setup.
@@ -68,6 +136,8 @@ char * __init xen_memory_setup(void)
 
        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 
+       xen_return_unused_memory(xen_start_info->nr_pages, &e820);
+
        return "Xen";
 }
 
@@ -157,6 +227,8 @@ void __init xen_arch_setup(void)
        struct physdev_set_iopl set_iopl;
        int rc;
 
+       xen_panic_handler_init();
+
        HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
        HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);