v4.19.13 snapshot.
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
new file mode 100644
index 0000000..075ed47
--- /dev/null
+++ b/arch/x86/xen/setup.c
@@ -0,0 +1,1016 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Machine specific setup for xen
+ *
+ * Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/pm.h>
+#include <linux/memblock.h>
+#include <linux/cpuidle.h>
+#include <linux/cpufreq.h>
+
+#include <asm/elf.h>
+#include <asm/vdso.h>
+#include <asm/e820/api.h>
+#include <asm/setup.h>
+#include <asm/acpi.h>
+#include <asm/numa.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/hypercall.h>
+
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/interface/callback.h>
+#include <xen/interface/memory.h>
+#include <xen/interface/physdev.h>
+#include <xen/features.h>
+#include <xen/hvc-console.h>
+#include "xen-ops.h"
+#include "vdso.h"
+#include "mmu.h"
+
+#define GB(x) ((uint64_t)(x) * 1024 * 1024 * 1024)
+
+/* Amount of extra memory space we add to the e820 ranges */
+struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
+
+/* Number of pages released from the initial allocation. */
+unsigned long xen_released_pages;
+
+/* E820 map used during setting up memory. */
+static struct e820_table xen_e820_table __initdata;
+
+/*
+ * Buffer used to remap identity mapped pages. We only need the virtual space.
+ * The physical page behind this address is remapped as needed to different
+ * buffer pages.
+ */
+#define REMAP_SIZE (P2M_PER_PAGE - 3)
+static struct {
+ unsigned long next_area_mfn;
+ unsigned long target_pfn;
+ unsigned long size;
+ unsigned long mfns[REMAP_SIZE];
+} xen_remap_buf __initdata __aligned(PAGE_SIZE);
+static unsigned long xen_remap_mfn __initdata = INVALID_P2M_ENTRY;
+
+/*
+ * The maximum amount of extra memory compared to the base size. The
+ * main scaling factor is the size of struct page. At extreme ratios
+ * of base:extra, all the base memory can be filled with page
+ * structures for the extra memory, leaving no space for anything
+ * else.
+ *
+ * 10x seems like a reasonable balance between scaling flexibility and
+ * leaving a practically usable system.
+ */
+#define EXTRA_MEM_RATIO (10)
+
+static bool xen_512gb_limit __initdata = IS_ENABLED(CONFIG_XEN_512GB);
+
+static void __init xen_parse_512gb(void)
+{
+ bool val = false;
+ char *arg;
+
+ arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit");
+ if (!arg)
+ return;
+
+ arg = strstr(xen_start_info->cmd_line, "xen_512gb_limit=");
+ if (!arg)
+ val = true;
+ else if (strtobool(arg + strlen("xen_512gb_limit="), &val))
+ return;
+
+ xen_512gb_limit = val;
+}
+
+static void __init xen_add_extra_mem(unsigned long start_pfn,
+ unsigned long n_pfns)
+{
+ int i;
+
+ /*
+ * No need to check for zero size, should happen rarely and will only
+ * write a new entry regarded to be unused due to zero size.
+ */
+ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+ /* Add new region. */
+ if (xen_extra_mem[i].n_pfns == 0) {
+ xen_extra_mem[i].start_pfn = start_pfn;
+ xen_extra_mem[i].n_pfns = n_pfns;
+ break;
+ }
+ /* Append to existing region. */
+ if (xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns ==
+ start_pfn) {
+ xen_extra_mem[i].n_pfns += n_pfns;
+ break;
+ }
+ }
+ if (i == XEN_EXTRA_MEM_MAX_REGIONS)
+ printk(KERN_WARNING "Warning: not enough extra memory regions\n");
+
+ memblock_reserve(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
+}
+
+static void __init xen_del_extra_mem(unsigned long start_pfn,
+ unsigned long n_pfns)
+{
+ int i;
+ unsigned long start_r, size_r;
+
+ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+ start_r = xen_extra_mem[i].start_pfn;
+ size_r = xen_extra_mem[i].n_pfns;
+
+ /* Start of region. */
+ if (start_r == start_pfn) {
+ BUG_ON(n_pfns > size_r);
+ xen_extra_mem[i].start_pfn += n_pfns;
+ xen_extra_mem[i].n_pfns -= n_pfns;
+ break;
+ }
+ /* End of region. */
+ if (start_r + size_r == start_pfn + n_pfns) {
+ BUG_ON(n_pfns > size_r);
+ xen_extra_mem[i].n_pfns -= n_pfns;
+ break;
+ }
+ /* Mid of region. */
+ if (start_pfn > start_r && start_pfn < start_r + size_r) {
+ BUG_ON(start_pfn + n_pfns > start_r + size_r);
+ xen_extra_mem[i].n_pfns = start_pfn - start_r;
+ /* Calling memblock_reserve() again is okay. */
+ xen_add_extra_mem(start_pfn + n_pfns, start_r + size_r -
+ (start_pfn + n_pfns));
+ break;
+ }
+ }
+ memblock_free(PFN_PHYS(start_pfn), PFN_PHYS(n_pfns));
+}
+
+/*
+ * Called during boot before the p2m list can take entries beyond the
+ * hypervisor supplied p2m list. Entries in extra mem are to be regarded as
+ * invalid.
+ */
+unsigned long __ref xen_chk_extra_mem(unsigned long pfn)
+{
+ int i;
+
+ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+ if (pfn >= xen_extra_mem[i].start_pfn &&
+ pfn < xen_extra_mem[i].start_pfn + xen_extra_mem[i].n_pfns)
+ return INVALID_P2M_ENTRY;
+ }
+
+ return IDENTITY_FRAME(pfn);
+}
+
+/*
+ * Mark all pfns of extra mem as invalid in p2m list.
+ */
+void __init xen_inv_extra_mem(void)
+{
+ unsigned long pfn, pfn_s, pfn_e;
+ int i;
+
+ for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
+ if (!xen_extra_mem[i].n_pfns)
+ continue;
+ pfn_s = xen_extra_mem[i].start_pfn;
+ pfn_e = pfn_s + xen_extra_mem[i].n_pfns;
+ for (pfn = pfn_s; pfn < pfn_e; pfn++)
+ set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
+ }
+}
+
+/*
+ * Finds the next RAM pfn available in the E820 map after min_pfn.
+ * This function updates min_pfn with the pfn found and returns
+ * the size of that range or zero if not found.
+ */
+static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
+{
+ const struct e820_entry *entry = xen_e820_table.entries;
+ unsigned int i;
+ unsigned long done = 0;
+
+ for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
+ unsigned long s_pfn;
+ unsigned long e_pfn;
+
+ if (entry->type != E820_TYPE_RAM)
+ continue;
+
+ e_pfn = PFN_DOWN(entry->addr + entry->size);
+
+ /* We only care about E820 after this */
+ if (e_pfn <= *min_pfn)
+ continue;
+
+ s_pfn = PFN_UP(entry->addr);
+
+ /* If min_pfn falls within the E820 entry, we want to start
+ * at the min_pfn PFN.
+ */
+ if (s_pfn <= *min_pfn) {
+ done = e_pfn - *min_pfn;
+ } else {
+ done = e_pfn - s_pfn;
+ *min_pfn = s_pfn;
+ }
+ break;
+ }
+
+ return done;
+}
+
+static int __init xen_free_mfn(unsigned long mfn)
+{
+ struct xen_memory_reservation reservation = {
+ .address_bits = 0,
+ .extent_order = 0,
+ .domid = DOMID_SELF
+ };
+
+ set_xen_guest_handle(reservation.extent_start, &mfn);
+ reservation.nr_extents = 1;
+
+ return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
+}
+
+/*
+ * This releases a chunk of memory and then does the identity map. It's used
+ * as a fallback if the remapping fails.
+ */
+static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,
+ unsigned long end_pfn, unsigned long nr_pages)
+{
+ unsigned long pfn, end;
+ int ret;
+
+ WARN_ON(start_pfn > end_pfn);
+
+ /* Release pages first. */
+ end = min(end_pfn, nr_pages);
+ for (pfn = start_pfn; 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;
+
+ ret = xen_free_mfn(mfn);
+ WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);
+
+ if (ret == 1) {
+ xen_released_pages++;
+ if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))
+ break;
+ } else
+ break;
+ }
+
+ set_phys_range_identity(start_pfn, end_pfn);
+}
+
+/*
+ * Helper function to update the p2m and m2p tables and kernel mapping.
+ */
+static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn)
+{
+ struct mmu_update update = {
+ .ptr = ((uint64_t)mfn << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE,
+ .val = pfn
+ };
+
+ /* Update p2m */
+ if (!set_phys_to_machine(pfn, mfn)) {
+ WARN(1, "Failed to set p2m mapping for pfn=%ld mfn=%ld\n",
+ pfn, mfn);
+ BUG();
+ }
+
+ /* Update m2p */
+ if (HYPERVISOR_mmu_update(&update, 1, NULL, DOMID_SELF) < 0) {
+ WARN(1, "Failed to set m2p mapping for mfn=%ld pfn=%ld\n",
+ mfn, pfn);
+ BUG();
+ }
+
+ /* Update kernel mapping, but not for highmem. */
+ if (pfn >= PFN_UP(__pa(high_memory - 1)))
+ return;
+
+ if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
+ mfn_pte(mfn, PAGE_KERNEL), 0)) {
+ WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n",
+ mfn, pfn);
+ BUG();
+ }
+}
+
+/*
+ * This function updates the p2m and m2p tables with an identity map from
+ * start_pfn to start_pfn+size and prepares remapping the underlying RAM of the
+ * original allocation at remap_pfn. The information needed for remapping is
+ * saved in the memory itself to avoid the need for allocating buffers. The
+ * complete remap information is contained in a list of MFNs each containing
+ * up to REMAP_SIZE MFNs and the start target PFN for doing the remap.
+ * This enables us to preserve the original mfn sequence while doing the
+ * remapping at a time when the memory management is capable of allocating
+ * virtual and physical memory in arbitrary amounts, see 'xen_remap_memory' and
+ * its callers.
+ */
+static void __init xen_do_set_identity_and_remap_chunk(
+ unsigned long start_pfn, unsigned long size, unsigned long remap_pfn)
+{
+ unsigned long buf = (unsigned long)&xen_remap_buf;
+ unsigned long mfn_save, mfn;
+ unsigned long ident_pfn_iter, remap_pfn_iter;
+ unsigned long ident_end_pfn = start_pfn + size;
+ unsigned long left = size;
+ unsigned int i, chunk;
+
+ WARN_ON(size == 0);
+
+ mfn_save = virt_to_mfn(buf);
+
+ for (ident_pfn_iter = start_pfn, remap_pfn_iter = remap_pfn;
+ ident_pfn_iter < ident_end_pfn;
+ ident_pfn_iter += REMAP_SIZE, remap_pfn_iter += REMAP_SIZE) {
+ chunk = (left < REMAP_SIZE) ? left : REMAP_SIZE;
+
+ /* Map first pfn to xen_remap_buf */
+ mfn = pfn_to_mfn(ident_pfn_iter);
+ set_pte_mfn(buf, mfn, PAGE_KERNEL);
+
+ /* Save mapping information in page */
+ xen_remap_buf.next_area_mfn = xen_remap_mfn;
+ xen_remap_buf.target_pfn = remap_pfn_iter;
+ xen_remap_buf.size = chunk;
+ for (i = 0; i < chunk; i++)
+ xen_remap_buf.mfns[i] = pfn_to_mfn(ident_pfn_iter + i);
+
+ /* Put remap buf into list. */
+ xen_remap_mfn = mfn;
+
+ /* Set identity map */
+ set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk);
+
+ left -= chunk;
+ }
+
+ /* Restore old xen_remap_buf mapping */
+ set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
+}
+
+/*
+ * This function takes a contiguous pfn range that needs to be identity mapped
+ * and:
+ *
+ * 1) Finds a new range of pfns to use to remap based on E820 and remap_pfn.
+ * 2) Calls the do_ function to actually do the mapping/remapping work.
+ *
+ * The goal is to not allocate additional memory but to remap the existing
+ * pages. In the case of an error the underlying memory is simply released back
+ * to Xen and not remapped.
+ */
+static unsigned long __init xen_set_identity_and_remap_chunk(
+ unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
+ unsigned long remap_pfn)
+{
+ unsigned long pfn;
+ unsigned long i = 0;
+ unsigned long n = end_pfn - start_pfn;
+
+ if (remap_pfn == 0)
+ remap_pfn = nr_pages;
+
+ while (i < n) {
+ unsigned long cur_pfn = start_pfn + i;
+ unsigned long left = n - i;
+ unsigned long size = left;
+ unsigned long remap_range_size;
+
+ /* Do not remap pages beyond the current allocation */
+ if (cur_pfn >= nr_pages) {
+ /* Identity map remaining pages */
+ set_phys_range_identity(cur_pfn, cur_pfn + size);
+ break;
+ }
+ if (cur_pfn + size > nr_pages)
+ size = nr_pages - cur_pfn;
+
+ remap_range_size = xen_find_pfn_range(&remap_pfn);
+ if (!remap_range_size) {
+ pr_warning("Unable to find available pfn range, not remapping identity pages\n");
+ xen_set_identity_and_release_chunk(cur_pfn,
+ cur_pfn + left, nr_pages);
+ break;
+ }
+ /* Adjust size to fit in current e820 RAM region */
+ if (size > remap_range_size)
+ size = remap_range_size;
+
+ xen_do_set_identity_and_remap_chunk(cur_pfn, size, remap_pfn);
+
+ /* Update variables to reflect new mappings. */
+ i += size;
+ remap_pfn += size;
+ }
+
+ /*
+ * If the PFNs are currently mapped, the VA mapping also needs
+ * to be updated to be 1:1.
+ */
+ for (pfn = start_pfn; pfn <= max_pfn_mapped && pfn < end_pfn; pfn++)
+ (void)HYPERVISOR_update_va_mapping(
+ (unsigned long)__va(pfn << PAGE_SHIFT),
+ mfn_pte(pfn, PAGE_KERNEL_IO), 0);
+
+ return remap_pfn;
+}
+
+static unsigned long __init xen_count_remap_pages(
+ unsigned long start_pfn, unsigned long end_pfn, unsigned long nr_pages,
+ unsigned long remap_pages)
+{
+ if (start_pfn >= nr_pages)
+ return remap_pages;
+
+ return remap_pages + min(end_pfn, nr_pages) - start_pfn;
+}
+
+static unsigned long __init xen_foreach_remap_area(unsigned long nr_pages,
+ unsigned long (*func)(unsigned long start_pfn, unsigned long end_pfn,
+ unsigned long nr_pages, unsigned long last_val))
+{
+ phys_addr_t start = 0;
+ unsigned long ret_val = 0;
+ const struct e820_entry *entry = xen_e820_table.entries;
+ int i;
+
+ /*
+ * Combine non-RAM regions and gaps until a RAM region (or the
+ * end of the map) is reached, then call the provided function
+ * to perform its duty on the non-RAM region.
+ *
+ * The combined non-RAM regions are rounded to a whole number
+ * of pages so any partial pages are accessible via the 1:1
+ * mapping. This is needed for some BIOSes that put (for
+ * example) the DMI tables in a reserved region that begins on
+ * a non-page boundary.
+ */
+ for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
+ phys_addr_t end = entry->addr + entry->size;
+ if (entry->type == E820_TYPE_RAM || i == xen_e820_table.nr_entries - 1) {
+ unsigned long start_pfn = PFN_DOWN(start);
+ unsigned long end_pfn = PFN_UP(end);
+
+ if (entry->type == E820_TYPE_RAM)
+ end_pfn = PFN_UP(entry->addr);
+
+ if (start_pfn < end_pfn)
+ ret_val = func(start_pfn, end_pfn, nr_pages,
+ ret_val);
+ start = end;
+ }
+ }
+
+ return ret_val;
+}
+
+/*
+ * Remap the memory prepared in xen_do_set_identity_and_remap_chunk().
+ * The remap information (which mfn remap to which pfn) is contained in the
+ * to be remapped memory itself in a linked list anchored at xen_remap_mfn.
+ * This scheme allows to remap the different chunks in arbitrary order while
+ * the resulting mapping will be independant from the order.
+ */
+void __init xen_remap_memory(void)
+{
+ unsigned long buf = (unsigned long)&xen_remap_buf;
+ unsigned long mfn_save, pfn;
+ unsigned long remapped = 0;
+ unsigned int i;
+ unsigned long pfn_s = ~0UL;
+ unsigned long len = 0;
+
+ mfn_save = virt_to_mfn(buf);
+
+ while (xen_remap_mfn != INVALID_P2M_ENTRY) {
+ /* Map the remap information */
+ set_pte_mfn(buf, xen_remap_mfn, PAGE_KERNEL);
+
+ BUG_ON(xen_remap_mfn != xen_remap_buf.mfns[0]);
+
+ pfn = xen_remap_buf.target_pfn;
+ for (i = 0; i < xen_remap_buf.size; i++) {
+ xen_update_mem_tables(pfn, xen_remap_buf.mfns[i]);
+ remapped++;
+ pfn++;
+ }
+ if (pfn_s == ~0UL || pfn == pfn_s) {
+ pfn_s = xen_remap_buf.target_pfn;
+ len += xen_remap_buf.size;
+ } else if (pfn_s + len == xen_remap_buf.target_pfn) {
+ len += xen_remap_buf.size;
+ } else {
+ xen_del_extra_mem(pfn_s, len);
+ pfn_s = xen_remap_buf.target_pfn;
+ len = xen_remap_buf.size;
+ }
+ xen_remap_mfn = xen_remap_buf.next_area_mfn;
+ }
+
+ if (pfn_s != ~0UL && len)
+ xen_del_extra_mem(pfn_s, len);
+
+ set_pte_mfn(buf, mfn_save, PAGE_KERNEL);
+
+ pr_info("Remapped %ld page(s)\n", remapped);
+}
+
+static unsigned long __init xen_get_pages_limit(void)
+{
+ unsigned long limit;
+
+#ifdef CONFIG_X86_32
+ limit = GB(64) / PAGE_SIZE;
+#else
+ limit = MAXMEM / PAGE_SIZE;
+ if (!xen_initial_domain() && xen_512gb_limit)
+ limit = GB(512) / PAGE_SIZE;
+#endif
+ return limit;
+}
+
+static unsigned long __init xen_get_max_pages(void)
+{
+ unsigned long max_pages, limit;
+ domid_t domid = DOMID_SELF;
+ long ret;
+
+ limit = xen_get_pages_limit();
+ max_pages = limit;
+
+ /*
+ * For the initial domain we use the maximum reservation as
+ * the maximum page.
+ *
+ * For guest domains the current maximum reservation reflects
+ * the current maximum rather than the static maximum. In this
+ * case the e820 map provided to us will cover the static
+ * maximum region.
+ */
+ if (xen_initial_domain()) {
+ ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
+ if (ret > 0)
+ max_pages = ret;
+ }
+
+ return min(max_pages, limit);
+}
+
+static void __init xen_align_and_add_e820_region(phys_addr_t start,
+ phys_addr_t size, int type)
+{
+ phys_addr_t end = start + size;
+
+ /* Align RAM regions to page boundaries. */
+ if (type == E820_TYPE_RAM) {
+ start = PAGE_ALIGN(start);
+ end &= ~((phys_addr_t)PAGE_SIZE - 1);
+ }
+
+ e820__range_add(start, end - start, type);
+}
+
+static void __init xen_ignore_unusable(void)
+{
+ struct e820_entry *entry = xen_e820_table.entries;
+ unsigned int i;
+
+ for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
+ if (entry->type == E820_TYPE_UNUSABLE)
+ entry->type = E820_TYPE_RAM;
+ }
+}
+
+bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
+{
+ struct e820_entry *entry;
+ unsigned mapcnt;
+ phys_addr_t end;
+
+ if (!size)
+ return false;
+
+ end = start + size;
+ entry = xen_e820_table.entries;
+
+ for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++) {
+ if (entry->type == E820_TYPE_RAM && entry->addr <= start &&
+ (entry->addr + entry->size) >= end)
+ return false;
+
+ entry++;
+ }
+
+ return true;
+}
+
+/*
+ * Find a free area in physical memory not yet reserved and compliant with
+ * E820 map.
+ * Used to relocate pre-allocated areas like initrd or p2m list which are in
+ * conflict with the to be used E820 map.
+ * In case no area is found, return 0. Otherwise return the physical address
+ * of the area which is already reserved for convenience.
+ */
+phys_addr_t __init xen_find_free_area(phys_addr_t size)
+{
+ unsigned mapcnt;
+ phys_addr_t addr, start;
+ struct e820_entry *entry = xen_e820_table.entries;
+
+ for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++, entry++) {
+ if (entry->type != E820_TYPE_RAM || entry->size < size)
+ continue;
+ start = entry->addr;
+ for (addr = start; addr < start + size; addr += PAGE_SIZE) {
+ if (!memblock_is_reserved(addr))
+ continue;
+ start = addr + PAGE_SIZE;
+ if (start + size > entry->addr + entry->size)
+ break;
+ }
+ if (addr >= start + size) {
+ memblock_reserve(start, size);
+ return start;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Like memcpy, but with physical addresses for dest and src.
+ */
+static void __init xen_phys_memcpy(phys_addr_t dest, phys_addr_t src,
+ phys_addr_t n)
+{
+ phys_addr_t dest_off, src_off, dest_len, src_len, len;
+ void *from, *to;
+
+ while (n) {
+ dest_off = dest & ~PAGE_MASK;
+ src_off = src & ~PAGE_MASK;
+ dest_len = n;
+ if (dest_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off)
+ dest_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - dest_off;
+ src_len = n;
+ if (src_len > (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off)
+ src_len = (NR_FIX_BTMAPS << PAGE_SHIFT) - src_off;
+ len = min(dest_len, src_len);
+ to = early_memremap(dest - dest_off, dest_len + dest_off);
+ from = early_memremap(src - src_off, src_len + src_off);
+ memcpy(to, from, len);
+ early_memunmap(to, dest_len + dest_off);
+ early_memunmap(from, src_len + src_off);
+ n -= len;
+ dest += len;
+ src += len;
+ }
+}
+
+/*
+ * Reserve Xen mfn_list.
+ */
+static void __init xen_reserve_xen_mfnlist(void)
+{
+ phys_addr_t start, size;
+
+ if (xen_start_info->mfn_list >= __START_KERNEL_map) {
+ start = __pa(xen_start_info->mfn_list);
+ size = PFN_ALIGN(xen_start_info->nr_pages *
+ sizeof(unsigned long));
+ } else {
+ start = PFN_PHYS(xen_start_info->first_p2m_pfn);
+ size = PFN_PHYS(xen_start_info->nr_p2m_frames);
+ }
+
+ memblock_reserve(start, size);
+ if (!xen_is_e820_reserved(start, size))
+ return;
+
+#ifdef CONFIG_X86_32
+ /*
+ * Relocating the p2m on 32 bit system to an arbitrary virtual address
+ * is not supported, so just give up.
+ */
+ xen_raw_console_write("Xen hypervisor allocated p2m list conflicts with E820 map\n");
+ BUG();
+#else
+ xen_relocate_p2m();
+ memblock_free(start, size);
+#endif
+}
+
+/**
+ * machine_specific_memory_setup - Hook for machine specific memory setup.
+ **/
+char * __init xen_memory_setup(void)
+{
+ unsigned long max_pfn, pfn_s, n_pfns;
+ phys_addr_t mem_end, addr, size, chunk_size;
+ u32 type;
+ int rc;
+ struct xen_memory_map memmap;
+ unsigned long max_pages;
+ unsigned long extra_pages = 0;
+ int i;
+ int op;
+
+ xen_parse_512gb();
+ max_pfn = xen_get_pages_limit();
+ max_pfn = min(max_pfn, xen_start_info->nr_pages);
+ mem_end = PFN_PHYS(max_pfn);
+
+ memmap.nr_entries = ARRAY_SIZE(xen_e820_table.entries);
+ set_xen_guest_handle(memmap.buffer, xen_e820_table.entries);
+
+ op = xen_initial_domain() ?
+ XENMEM_machine_memory_map :
+ XENMEM_memory_map;
+ rc = HYPERVISOR_memory_op(op, &memmap);
+ if (rc == -ENOSYS) {
+ BUG_ON(xen_initial_domain());
+ memmap.nr_entries = 1;
+ xen_e820_table.entries[0].addr = 0ULL;
+ xen_e820_table.entries[0].size = mem_end;
+ /* 8MB slack (to balance backend allocations). */
+ xen_e820_table.entries[0].size += 8ULL << 20;
+ xen_e820_table.entries[0].type = E820_TYPE_RAM;
+ rc = 0;
+ }
+ BUG_ON(rc);
+ BUG_ON(memmap.nr_entries == 0);
+ xen_e820_table.nr_entries = memmap.nr_entries;
+
+ /*
+ * Xen won't allow a 1:1 mapping to be created to UNUSABLE
+ * regions, so if we're using the machine memory map leave the
+ * region as RAM as it is in the pseudo-physical map.
+ *
+ * UNUSABLE regions in domUs are not handled and will need
+ * a patch in the future.
+ */
+ if (xen_initial_domain())
+ xen_ignore_unusable();
+
+ /* Make sure the Xen-supplied memory map is well-ordered. */
+ e820__update_table(&xen_e820_table);
+
+ max_pages = xen_get_max_pages();
+
+ /* How many extra pages do we need due to remapping? */
+ max_pages += xen_foreach_remap_area(max_pfn, xen_count_remap_pages);
+
+ if (max_pages > max_pfn)
+ extra_pages += max_pages - max_pfn;
+
+ /*
+ * Clamp the amount of extra memory to a EXTRA_MEM_RATIO
+ * factor the base size. On non-highmem systems, the base
+ * size is the full initial memory allocation; on highmem it
+ * is limited to the max size of lowmem, so that it doesn't
+ * get completely filled.
+ *
+ * Make sure we have no memory above max_pages, as this area
+ * isn't handled by the p2m management.
+ *
+ * In principle there could be a problem in lowmem systems if
+ * the initial memory is also very large with respect to
+ * lowmem, but we won't try to deal with that here.
+ */
+ extra_pages = min3(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
+ extra_pages, max_pages - max_pfn);
+ i = 0;
+ 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;
+
+ if (type == E820_TYPE_RAM) {
+ if (addr < mem_end) {
+ chunk_size = min(size, mem_end - addr);
+ } else if (extra_pages) {
+ chunk_size = min(size, PFN_PHYS(extra_pages));
+ pfn_s = PFN_UP(addr);
+ n_pfns = PFN_DOWN(addr + chunk_size) - pfn_s;
+ extra_pages -= n_pfns;
+ xen_add_extra_mem(pfn_s, n_pfns);
+ xen_max_p2m_pfn = pfn_s + n_pfns;
+ } else
+ discard = true;
+ }
+
+ if (!discard)
+ xen_align_and_add_e820_region(addr, chunk_size, type);
+
+ addr += chunk_size;
+ size -= chunk_size;
+ if (size == 0) {
+ i++;
+ if (i < xen_e820_table.nr_entries) {
+ addr = xen_e820_table.entries[i].addr;
+ size = xen_e820_table.entries[i].size;
+ }
+ }
+ }
+
+ /*
+ * Set the rest as identity mapped, in case PCI BARs are
+ * located here.
+ */
+ set_phys_range_identity(addr / PAGE_SIZE, ~0ul);
+
+ /*
+ * In domU, the ISA region is normal, usable memory, but we
+ * reserve ISA memory anyway because too many things poke
+ * about in there.
+ */
+ e820__range_add(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS, E820_TYPE_RESERVED);
+
+ e820__update_table(e820_table);
+
+ /*
+ * Check whether the kernel itself conflicts with the target E820 map.
+ * Failing now is better than running into weird problems later due
+ * to relocating (and even reusing) pages with kernel text or data.
+ */
+ if (xen_is_e820_reserved(__pa_symbol(_text),
+ __pa_symbol(__bss_stop) - __pa_symbol(_text))) {
+ xen_raw_console_write("Xen hypervisor allocated kernel memory conflicts with E820 map\n");
+ BUG();
+ }
+
+ /*
+ * Check for a conflict of the hypervisor supplied page tables with
+ * the target E820 map.
+ */
+ xen_pt_check_e820();
+
+ xen_reserve_xen_mfnlist();
+
+ /* Check for a conflict of the initrd with the target E820 map. */
+ if (xen_is_e820_reserved(boot_params.hdr.ramdisk_image,
+ boot_params.hdr.ramdisk_size)) {
+ phys_addr_t new_area, start, size;
+
+ new_area = xen_find_free_area(boot_params.hdr.ramdisk_size);
+ if (!new_area) {
+ xen_raw_console_write("Can't find new memory area for initrd needed due to E820 map conflict\n");
+ BUG();
+ }
+
+ start = boot_params.hdr.ramdisk_image;
+ size = boot_params.hdr.ramdisk_size;
+ xen_phys_memcpy(new_area, start, size);
+ pr_info("initrd moved from [mem %#010llx-%#010llx] to [mem %#010llx-%#010llx]\n",
+ start, start + size, new_area, new_area + size);
+ memblock_free(start, size);
+ boot_params.hdr.ramdisk_image = new_area;
+ boot_params.ext_ramdisk_image = new_area >> 32;
+ }
+
+ /*
+ * Set identity map on non-RAM pages and prepare remapping the
+ * underlying RAM.
+ */
+ xen_foreach_remap_area(max_pfn, xen_set_identity_and_remap_chunk);
+
+ pr_info("Released %ld page(s)\n", xen_released_pages);
+
+ return "Xen";
+}
+
+/*
+ * Set the bit indicating "nosegneg" library variants should be used.
+ * We only need to bother in pure 32-bit mode; compat 32-bit processes
+ * can have un-truncated segments, so wrapping around is allowed.
+ */
+static void __init fiddle_vdso(void)
+{
+#ifdef CONFIG_X86_32
+ u32 *mask = vdso_image_32.data +
+ vdso_image_32.sym_VDSO32_NOTE_MASK;
+ *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
+#endif
+}
+
+static int register_callback(unsigned type, const void *func)
+{
+ struct callback_register callback = {
+ .type = type,
+ .address = XEN_CALLBACK(__KERNEL_CS, func),
+ .flags = CALLBACKF_mask_events,
+ };
+
+ return HYPERVISOR_callback_op(CALLBACKOP_register, &callback);
+}
+
+void xen_enable_sysenter(void)
+{
+ int ret;
+ unsigned sysenter_feature;
+
+#ifdef CONFIG_X86_32
+ sysenter_feature = X86_FEATURE_SEP;
+#else
+ sysenter_feature = X86_FEATURE_SYSENTER32;
+#endif
+
+ if (!boot_cpu_has(sysenter_feature))
+ return;
+
+ ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
+ if(ret != 0)
+ setup_clear_cpu_cap(sysenter_feature);
+}
+
+void xen_enable_syscall(void)
+{
+#ifdef CONFIG_X86_64
+ int ret;
+
+ ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
+ if (ret != 0) {
+ printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
+ /* Pretty fatal; 64-bit userspace has no other
+ mechanism for syscalls. */
+ }
+
+ if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
+ ret = register_callback(CALLBACKTYPE_syscall32,
+ xen_syscall32_target);
+ if (ret != 0)
+ setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
+ }
+#endif /* CONFIG_X86_64 */
+}
+
+void __init xen_pvmmu_arch_setup(void)
+{
+ HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
+ HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
+
+ HYPERVISOR_vm_assist(VMASST_CMD_enable,
+ VMASST_TYPE_pae_extended_cr3);
+
+ if (register_callback(CALLBACKTYPE_event, xen_hypervisor_callback) ||
+ register_callback(CALLBACKTYPE_failsafe, xen_failsafe_callback))
+ BUG();
+
+ xen_enable_sysenter();
+ xen_enable_syscall();
+}
+
+/* This function is not called for HVM domains */
+void __init xen_arch_setup(void)
+{
+ xen_panic_handler_init();
+ xen_pvmmu_arch_setup();
+
+#ifdef CONFIG_ACPI
+ if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
+ printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
+ disable_acpi();
+ }
+#endif
+
+ memcpy(boot_command_line, xen_start_info->cmd_line,
+ MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
+ COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
+
+ /* Set up idle, making sure it calls safe_halt() pvop */
+ disable_cpuidle();
+ disable_cpufreq();
+ WARN_ON(xen_set_default_idle());
+ fiddle_vdso();
+#ifdef CONFIG_NUMA
+ numa_off = 1;
+#endif
+}