mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
990 lines
26 KiB
990 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Machine specific setup for xen |
|
* |
|
* Jeremy Fitzhardinge <[email protected]>, 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 <linux/memory_hotplug.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/idtentry.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 "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_warn("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 independent 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; |
|
|
|
limit = MAXMEM / PAGE_SIZE; |
|
if (!xen_initial_domain() && xen_512gb_limit) |
|
limit = GB(512) / PAGE_SIZE; |
|
|
|
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); |
|
#ifdef CONFIG_MEMORY_HOTPLUG |
|
/* |
|
* Don't allow adding memory not in E820 map while booting the |
|
* system. Once the balloon driver is up it will remove that |
|
* restriction again. |
|
*/ |
|
max_mem_size = end; |
|
#endif |
|
} |
|
|
|
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; |
|
|
|
xen_relocate_p2m(); |
|
memblock_free(start, size); |
|
} |
|
|
|
/** |
|
* 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); |
|
|
|
#if defined(CONFIG_MEMORY_HOTPLUG) && defined(CONFIG_XEN_BALLOON) |
|
xen_saved_max_mem_size = max_mem_size; |
|
#endif |
|
|
|
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. |
|
* |
|
* Make sure we have no memory above max_pages, as this area |
|
* isn't handled by the p2m management. |
|
*/ |
|
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"; |
|
} |
|
|
|
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; |
|
|
|
sysenter_feature = X86_FEATURE_SYSENTER32; |
|
|
|
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) |
|
{ |
|
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); |
|
} |
|
} |
|
|
|
static 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_asm_exc_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()); |
|
#ifdef CONFIG_NUMA |
|
numa_off = 1; |
|
#endif |
|
}
|
|
|