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Miscellaneous x86 fixes:

Browse Source 
- Fix memory map enumeration bug in the Xen e820 parsing code
    (Juergen Gross)
 
  - Re-enable e820 BIOS fallback if e820 table is empty
    (David Gow)
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:

 - Fix memory map enumeration bug in the Xen e820 parsing code (Juergen
   Gross)

 - Re-enable e820 BIOS fallback if e820 table is empty (David Gow)

* tag 'x86-urgent-2026-05-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot/e820: Re-enable BIOS fallback if e820 table is empty
  x86/xen: Fix a potential problem in xen_e820_resolve_conflicts()
This commit is contained in:
Linus Torvalds 2026-05-08 20:28:45 -07:00
commit 70390501d1
2 changed files with 14 additions and 5 deletions
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6
arch/x86/kernel/e820.c
View File

@ -450,6 +450,10 @@ __init static int append_e820_table(struct boot_e820_entry *entries, u32 nr_entr
{
struct boot_e820_entry *entry = entries;
/* If there aren't any entries, we'll want to fall back to another source: */
if (!nr_entries)
return -ENOENT;
while (nr_entries) {
u64 start = entry->addr;
u64 size = entry->size;
@ -458,7 +462,7 @@ __init static int append_e820_table(struct boot_e820_entry *entries, u32 nr_entr
/* Ignore the remaining entries on 64-bit overflow: */
if (start > end && likely(size))
return -1;
return -EINVAL;
e820__range_add(start, size, type);

13
arch/x86/xen/setup.c
View File

@ -695,17 +695,22 @@ static void __init xen_e820_resolve_conflicts(phys_addr_t start,
return;
end = start + size;
entry = xen_e820_table.entries;
mapcnt = 0;
for (mapcnt = 0; mapcnt < xen_e820_table.nr_entries; mapcnt++) {
while (mapcnt < xen_e820_table.nr_entries) {
entry = xen_e820_table.entries + mapcnt;
if (entry->addr >= end)
return;
if (entry->addr + entry->size > start &&
entry->type == E820_TYPE_NVS)
entry->type == E820_TYPE_NVS) {
xen_e820_swap_entry_with_ram(entry);
/* E820 map has been changed, restart loop! */
mapcnt = 0;
continue;
}
entry++;
mapcnt++;
}
}