[PATCH 42/50] xen, x86/boot/e820: Simplify Xen's xen_e820_table construct

From: Ingo Molnar
Date: Sat Jan 28 2017 - 20:05:51 EST

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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@xxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Huang, Ying <ying.huang@xxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/xen/setup.c | 70 +++++++++++++++++++++++++++++++++-------------------------------------
1 file changed, 33 insertions(+), 37 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 381a0d3577a7..cf29abfc392c 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -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;
--
2.7.4

Next message: Ingo Molnar: "[PATCH 32/50] x86/boot/e820: Create coherent API function names for E820 range operations"
Previous message: Finn Thain: "Re: [PATCH 0/6] ncr5380: Miscellaneous minor patches"
In reply to: Ingo Molnar: "[PATCH 31/50] x86/boot/e820: Rename e820_setup_gap() to e820__setup_pci_gap()"
Next in thread: Ingo Molnar: "[PATCH 32/50] x86/boot/e820: Create coherent API function names for E820 range operations"
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