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xen, x86/boot/e820: Simplify Xen's xen_e820_table construct 

The Xen guest memory setup code has:

	static struct e820_entry xen_e820_table[E820_MAX_ENTRIES] __initdata;
	static u32 xen_e820_table_entries __initdata;

... which is really a 'struct e820_table', open-coded.

Convert the Xen code over to use a single struct e820_table, as this
will allow the simplification of the e820__update_table() API.

No intended change in functionality, but not runtime tested.

Cc: Alex Thorlton <athorlton@sgi.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Jackson <pj@sgi.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2017-01-28 18:19:01 +01:00
parent d88961b5d4
commit e7dbf7ad41
1 changed files with 33 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
arch/x86/xen/setup.c
View File

@ -41,8 +41,7 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
unsigned long xen_released_pages;
/* E820 map used during setting up memory. */
static struct e820_entry xen_e820_table[E820_MAX_ENTRIES] __initdata;
static u32 xen_e820_table_entries __initdata;
static struct e820_table xen_e820_table __initdata;
/*
* Buffer used to remap identity mapped pages. We only need the virtual space.
@ -198,11 +197,11 @@ void __init xen_inv_extra_mem(void)
*/
static unsigned long __init xen_find_pfn_range(unsigned long *min_pfn)
{
const struct e820_entry *entry = xen_e820_table;
const struct e820_entry *entry = xen_e820_table.entries;
unsigned int i;
unsigned long done = 0;
for (i = 0; i < xen_e820_table_entries; i++, entry++) {
for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
unsigned long s_pfn;
unsigned long e_pfn;
@ -457,7 +456,7 @@ static unsigned long __init xen_foreach_remap_area(unsigned long nr_pages,
{
phys_addr_t start = 0;
unsigned long ret_val = 0;
const struct e820_entry *entry = xen_e820_table;
const struct e820_entry *entry = xen_e820_table.entries;
int i;
/*
@ -471,9 +470,9 @@ static unsigned long __init xen_foreach_remap_area(unsigned long nr_pages,
* example) the DMI tables in a reserved region that begins on
* a non-page boundary.
*/
for (i = 0; i < xen_e820_table_entries; i++, entry++) {
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_entries - 1) {
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);
@ -601,10 +600,10 @@ static void __init xen_align_and_add_e820_region(phys_addr_t start,
static void __init xen_ignore_unusable(void)
{
struct e820_entry *entry = xen_e820_table;
struct e820_entry *entry = xen_e820_table.entries;
unsigned int i;
for (i = 0; i < xen_e820_table_entries; i++, entry++) {
for (i = 0; i < xen_e820_table.nr_entries; i++, entry++) {
if (entry->type == E820_TYPE_UNUSABLE)
entry->type = E820_TYPE_RAM;
}
@ -620,9 +619,9 @@ bool __init xen_is_e820_reserved(phys_addr_t start, phys_addr_t size)
return false;
end = start + size;
entry = xen_e820_table;
entry = xen_e820_table.entries;
for (mapcnt = 0; mapcnt < xen_e820_table_entries; mapcnt++) {
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;
@ -645,9 +644,9 @@ 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;
struct e820_entry *entry = xen_e820_table.entries;
for (mapcnt = 0; mapcnt < xen_e820_table_entries; mapcnt++, entry++) {
for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++, entry++) {
if (entry->type != E820_TYPE_RAM || entry->size < size)
continue;
start = entry->addr;
@ -750,8 +749,8 @@ char * __init xen_memory_setup(void)
max_pfn = min(max_pfn, xen_start_info->nr_pages);
mem_end = PFN_PHYS(max_pfn);
memmap.nr_entries = ARRAY_SIZE(xen_e820_table);
set_xen_guest_handle(memmap.buffer, xen_e820_table);
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 :
@ -760,16 +759,16 @@ char * __init xen_memory_setup(void)
if (rc == -ENOSYS) {
BUG_ON(xen_initial_domain());
memmap.nr_entries = 1;
xen_e820_table[0].addr = 0ULL;
xen_e820_table[0].size = mem_end;
xen_e820_table.entries[0].addr = 0ULL;
xen_e820_table.entries[0].size = mem_end;
/* 8MB slack (to balance backend allocations). */
xen_e820_table[0].size += 8ULL << 20;
xen_e820_table[0].type = E820_TYPE_RAM;
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_entries = memmap.nr_entries;
xen_e820_table.nr_entries = memmap.nr_entries;
/*
* Xen won't allow a 1:1 mapping to be created to UNUSABLE
@ -783,8 +782,7 @@ char * __init xen_memory_setup(void)
xen_ignore_unusable();
/* Make sure the Xen-supplied memory map is well-ordered. */
e820__update_table(xen_e820_table, ARRAY_SIZE(xen_e820_table),
&xen_e820_table_entries);
e820__update_table(xen_e820_table.entries, ARRAY_SIZE(xen_e820_table.entries), &xen_e820_table.nr_entries);
max_pages = xen_get_max_pages();
@ -811,13 +809,13 @@ char * __init xen_memory_setup(void)
extra_pages = min3(EXTRA_MEM_RATIO * min(max_pfn, PFN_DOWN(MAXMEM)),
extra_pages, max_pages - max_pfn);
i = 0;
addr = xen_e820_table[0].addr;
size = xen_e820_table[0].size;
while (i < xen_e820_table_entries) {
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[i].type;
type = xen_e820_table.entries[i].type;
if (type == E820_TYPE_RAM) {
if (addr < mem_end) {
@ -840,9 +838,9 @@ char * __init xen_memory_setup(void)
size -= chunk_size;
if (size == 0) {
i++;
if (i < xen_e820_table_entries) {
addr = xen_e820_table[i].addr;
size = xen_e820_table[i].size;
if (i < xen_e820_table.nr_entries) {
addr = xen_e820_table.entries[i].addr;
size = xen_e820_table.entries[i].size;
}
}
}
@ -923,21 +921,19 @@ char * __init xen_auto_xlated_memory_setup(void)
int i;
int rc;
memmap.nr_entries = ARRAY_SIZE(xen_e820_table);
set_xen_guest_handle(memmap.buffer, xen_e820_table);
memmap.nr_entries = ARRAY_SIZE(xen_e820_table.entries);
set_xen_guest_handle(memmap.buffer, xen_e820_table.entries);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc < 0)
panic("No memory map (%d)\n", rc);
xen_e820_table_entries = memmap.nr_entries;
xen_e820_table.nr_entries = memmap.nr_entries;
e820__update_table(xen_e820_table, ARRAY_SIZE(xen_e820_table),
&xen_e820_table_entries);
e820__update_table(xen_e820_table.entries, ARRAY_SIZE(xen_e820_table.entries), &xen_e820_table.nr_entries);
for (i = 0; i < xen_e820_table_entries; i++)
e820__range_add(xen_e820_table[i].addr, xen_e820_table[i].size,
xen_e820_table[i].type);
for (i = 0; i < xen_e820_table.nr_entries; i++)
e820__range_add(xen_e820_table.entries[i].addr, xen_e820_table.entries[i].size, xen_e820_table.entries[i].type);
/* Remove p2m info, it is not needed. */
xen_start_info->mfn_list = 0;