4 files changed, 13 insertions, 141 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 67b2f31a1265..aa1cc483bd2a 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -10,7 +10,6 @@
 #include <xen/xen.h>
 #include <xen/features.h>
 #include <xen/page.h>
-#include <xen/interface/memory.h>
 
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -346,80 +345,3 @@ void xen_arch_unregister_cpu(int num)
 }
 EXPORT_SYMBOL(xen_arch_unregister_cpu);
 #endif
-
-#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
-void __init arch_xen_balloon_init(struct resource *hostmem_resource)
-{
-        struct xen_memory_map memmap;
-        int rc;
-        unsigned int i, last_guest_ram;
-        phys_addr_t max_addr = PFN_PHYS(max_pfn);
-        struct e820_table *xen_e820_table;
-        const struct e820_entry *entry;
-        struct resource *res;
-
-        if (!xen_initial_domain())
-                return;
-
-        xen_e820_table = kmalloc(sizeof(*xen_e820_table), GFP_KERNEL);
-        if (!xen_e820_table)
-                return;
-
-        memmap.nr_entries = ARRAY_SIZE(xen_e820_table->entries);
-        set_xen_guest_handle(memmap.buffer, xen_e820_table->entries);
-        rc = HYPERVISOR_memory_op(XENMEM_machine_memory_map, &memmap);
-        if (rc) {
-                pr_warn("%s: Can't read host e820 (%d)\n", __func__, rc);
-                goto out;
-        }
-
-        last_guest_ram = 0;
-        for (i = 0; i < memmap.nr_entries; i++) {
-                if (xen_e820_table->entries[i].addr >= max_addr)
-                        break;
-                if (xen_e820_table->entries[i].type == E820_TYPE_RAM)
-                        last_guest_ram = i;
-        }
-
-        entry = &xen_e820_table->entries[last_guest_ram];
-        if (max_addr >= entry->addr + entry->size)
-                goto out; /* No unallocated host RAM. */
-
-        hostmem_resource->start = max_addr;
-        hostmem_resource->end = entry->addr + entry->size;
-
-        /*
-         * Mark non-RAM regions between the end of dom0 RAM and end of host RAM
-         * as unavailable. The rest of that region can be used for hotplug-based
-         * ballooning.
-         */
-        for (; i < memmap.nr_entries; i++) {
-                entry = &xen_e820_table->entries[i];
-
-                if (entry->type == E820_TYPE_RAM)
-                        continue;
-
-                if (entry->addr >= hostmem_resource->end)
-                        break;
-
-                res = kzalloc(sizeof(*res), GFP_KERNEL);
-                if (!res)
-                        goto out;
-
-                res->name = "Unavailable host RAM";
-                res->start = entry->addr;
-                res->end = (entry->addr + entry->size < hostmem_resource->end) ?
-                            entry->addr + entry->size : hostmem_resource->end;
-                rc = insert_resource(hostmem_resource, res);
-                if (rc) {
-                        pr_warn("%s: Can't insert [%llx - %llx) (%d)\n",
-                                __func__, res->start, res->end, rc);
-                        kfree(res);
-                        goto  out;
-                }
-        }
-
- out:
-        kfree(xen_e820_table);
-}
-#endif /* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG */
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 1163e33121fb..075ed47993bb 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -808,6 +808,7 @@ char * __init xen_memory_setup(void)
         addr = xen_e820_table.entries[0].addr;
         size = xen_e820_table.entries[0].size;
         while (i < xen_e820_table.nr_entries) {
+                bool discard = false;
 
                 chunk_size = size;
                 type = xen_e820_table.entries[i].type;
@@ -823,10 +824,11 @@ char * __init xen_memory_setup(void)
                                 xen_add_extra_mem(pfn_s, n_pfns);
                                 xen_max_p2m_pfn = pfn_s + n_pfns;
                         } else
-                                type = E820_TYPE_UNUSABLE;
+                                discard = true;
                 }
 
-                xen_align_and_add_e820_region(addr, chunk_size, type);
+                if (!discard)
+                        xen_align_and_add_e820_region(addr, chunk_size, type);
 
                 addr += chunk_size;
                 size -= chunk_size;
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index e12bb256036f..7ab6caef599c 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -251,25 +251,10 @@ static void release_memory_resource(struct resource *resource)
         kfree(resource);
 }
 
-/*
- * Host memory not allocated to dom0. We can use this range for hotplug-based
- * ballooning.
- *
- * It's a type-less resource. Setting IORESOURCE_MEM will make resource
- * management algorithms (arch_remove_reservations()) look into guest e820,
- * which we don't want.
- */
-static struct resource hostmem_resource = {
-        .name   = "Host RAM",
-};
-
-void __attribute__((weak)) __init arch_xen_balloon_init(struct resource *res)
-{}
-
 static struct resource *additional_memory_resource(phys_addr_t size)
 {
-        struct resource *res, *res_hostmem;
-        int ret = -ENOMEM;
+        struct resource *res;
+        int ret;
 
         res = kzalloc(sizeof(*res), GFP_KERNEL);
         if (!res)
@@ -278,42 +263,13 @@ static struct resource *additional_memory_resource(phys_addr_t size)
         res->name = "System RAM";
         res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 
-        res_hostmem = kzalloc(sizeof(*res), GFP_KERNEL);
-        if (res_hostmem) {
-                /* Try to grab a range from hostmem */
-                res_hostmem->name = "Host memory";
-                ret = allocate_resource(&hostmem_resource, res_hostmem,
-                                        size, 0, -1,
-                                        PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
-        }
-
-        if (!ret) {
-                /*
-                 * Insert this resource into iomem. Because hostmem_resource
-                 * tracks portion of guest e820 marked as UNUSABLE noone else
-                 * should try to use it.
-                 */
-                res->start = res_hostmem->start;
-                res->end = res_hostmem->end;
-                ret = insert_resource(&iomem_resource, res);
-                if (ret < 0) {
-                        pr_err("Can't insert iomem_resource [%llx - %llx]\n",
-                                res->start, res->end);
-                        release_memory_resource(res_hostmem);
-                        res_hostmem = NULL;
-                        res->start = res->end = 0;
-                }
-        }
-
-        if (ret) {
-                ret = allocate_resource(&iomem_resource, res,
-                                        size, 0, -1,
-                                        PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
-                if (ret < 0) {
-                        pr_err("Cannot allocate new System RAM resource\n");
-                        kfree(res);
-                        return NULL;
-                }
+        ret = allocate_resource(&iomem_resource, res,
+                                size, 0, -1,
+                                PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
+        if (ret < 0) {
+                pr_err("Cannot allocate new System RAM resource\n");
+                kfree(res);
+                return NULL;
         }
 
 #ifdef CONFIG_SPARSEMEM
@@ -325,7 +281,6 @@ static struct resource *additional_memory_resource(phys_addr_t size)
                         pr_err("New System RAM resource outside addressable RAM (%lu > %lu)\n",
                                pfn, limit);
                         release_memory_resource(res);
-                        release_memory_resource(res_hostmem);
                         return NULL;
                 }
         }
@@ -747,8 +702,6 @@ static int __init balloon_init(void)
         set_online_page_callback(&xen_online_page);
         register_memory_notifier(&xen_memory_nb);
         register_sysctl_table(xen_root);
-
-        arch_xen_balloon_init(&hostmem_resource);
 #endif
 
 #ifdef CONFIG_XEN_PV
diff --git a/include/xen/balloon.h b/include/xen/balloon.h
index 61f410fd74e4..4914b93a23f2 100644
--- a/include/xen/balloon.h
+++ b/include/xen/balloon.h
@@ -44,8 +44,3 @@ static inline void xen_balloon_init(void)
 {
 }
 #endif
-
-#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
-struct resource;
-void arch_xen_balloon_init(struct resource *hostmem_resource);
-#endif