From: Artem Kuzin <[email protected]>
Co-developed-by: Nikita Panov <[email protected]>
Signed-off-by: Nikita Panov <[email protected]>
Co-developed-by: Alexander Grubnikov <[email protected]>
Signed-off-by: Alexander Grubnikov <[email protected]>
Signed-off-by: Artem Kuzin <[email protected]>
---
arch/x86/kernel/alternative.c | 116 ++++++++++++++++++----------------
1 file changed, 62 insertions(+), 54 deletions(-)
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 44843a492e69..b0abd60bcafe 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -18,6 +18,7 @@
#include <linux/mmu_context.h>
#include <linux/bsearch.h>
#include <linux/sync_core.h>
+#include <linux/numa_replication.h>
#include <asm/text-patching.h>
#include <asm/alternative.h>
#include <asm/sections.h>
@@ -1659,6 +1660,7 @@ void __init_or_module text_poke_early(void *addr, const
void *opcode,
size_t len)
{
unsigned long flags;
+ int nid;
if (boot_cpu_has(X86_FEATURE_NX) &&
is_module_text_address((unsigned long)addr)) {
@@ -1669,8 +1671,18 @@ void __init_or_module text_poke_early(void *addr, const
void *opcode,
*/
memcpy(addr, opcode, len);
} else {
+ unsigned long iaddr = (unsigned long)addr;
+
local_irq_save(flags);
- memcpy(addr, opcode, len);
+ if (is_text_replicated() && is_kernel_text(iaddr)) {
+ for_each_replica(nid) {
+ void *vaddr = numa_addr_in_replica(addr, nid);
+
+ memcpy(vaddr, opcode, len);
+ }
+ } else {
+ memcpy(addr, opcode, len);
+ }
local_irq_restore(flags);
sync_core();
@@ -1764,36 +1776,21 @@ typedef void text_poke_f(void *dst, const void *src,
size_t len);
static void *__text_poke(text_poke_f func, void *addr, const void *src, size_t
len)
{
+ int nid;
bool cross_page_boundary = offset_in_page(addr) + len > PAGE_SIZE;
struct page *pages[2] = {NULL};
temp_mm_state_t prev;
unsigned long flags;
+ int size_in_poking_mm = PAGE_SIZE;
pte_t pte, *ptep;
spinlock_t *ptl;
pgprot_t pgprot;
-
+ bool has_replica = numa_addr_has_replica(addr);
/*
* While boot memory allocator is running we cannot use struct pages as
* they are not yet initialized. There is no way to recover.
*/
BUG_ON(!after_bootmem);
-
- if (!core_kernel_text((unsigned long)addr)) {
- pages[0] = vmalloc_to_page(addr);
- if (cross_page_boundary)
- pages[1] = vmalloc_to_page(addr + PAGE_SIZE);
- } else {
- pages[0] = virt_to_page(addr);
- WARN_ON(!PageReserved(pages[0]));
- if (cross_page_boundary)
- pages[1] = virt_to_page(addr + PAGE_SIZE);
- }
- /*
- * If something went wrong, crash and burn since recovery paths are not
- * implemented.
- */
- BUG_ON(!pages[0] || (cross_page_boundary && !pages[1]));
-
/*
* Map the page without the global bit, as TLB flushing is done with
* flush_tlb_mm_range(), which is intended for non-global PTEs.
@@ -1812,48 +1809,59 @@ static void *__text_poke(text_poke_f func, void *addr,
const void *src, size_t l
local_irq_save(flags);
- pte = mk_pte(pages[0], pgprot);
- set_pte_at(poking_mm, poking_addr, ptep, pte);
+ for_each_replica(nid) {
+ prev = use_temporary_mm(poking_mm);
- if (cross_page_boundary) {
- pte = mk_pte(pages[1], pgprot);
- set_pte_at(poking_mm, poking_addr + PAGE_SIZE, ptep + 1, pte);
- }
+ pages[0] = walk_to_page_node(nid, addr);
+ if (cross_page_boundary)
+ pages[1] = walk_to_page_node(nid, addr + PAGE_SIZE);
- /*
- * Loading the temporary mm behaves as a compiler barrier, which
- * guarantees that the PTE will be set at the time memcpy() is done.
- */
- prev = use_temporary_mm(poking_mm);
+ BUG_ON(!pages[0] || (cross_page_boundary && !pages[1]));
- kasan_disable_current();
- func((u8 *)poking_addr + offset_in_page(addr), src, len);
- kasan_enable_current();
+ pte = mk_pte(pages[0], pgprot);
+ set_pte_at(poking_mm, poking_addr, ptep, pte);
- /*
- * Ensure that the PTE is only cleared after the instructions of memcpy
- * were issued by using a compiler barrier.
- */
- barrier();
+ if (cross_page_boundary) {
+ pte = mk_pte(pages[1], pgprot);
+ set_pte_at(poking_mm, poking_addr + PAGE_SIZE, ptep +
1, pte);
+ }
+ /*
+ * Compiler barrier to ensure that PTE is set before func()
+ */
+ barrier();
- pte_clear(poking_mm, poking_addr, ptep);
- if (cross_page_boundary)
- pte_clear(poking_mm, poking_addr + PAGE_SIZE, ptep + 1);
+ kasan_disable_current();
+ func((u8 *)poking_addr + offset_in_page(addr), src, len);
+ kasan_enable_current();
- /*
- * Loading the previous page-table hierarchy requires a serializing
- * instruction that already allows the core to see the updated version.
- * Xen-PV is assumed to serialize execution in a similar manner.
- */
- unuse_temporary_mm(prev);
+ /*
+ * Ensure that the PTE is only cleared after the instructions
of memcpy
+ * were issued by using a compiler barrier.
+ */
+ barrier();
- /*
- * Flushing the TLB might involve IPIs, which would require enabled
- * IRQs, but not if the mm is not used, as it is in this point.
- */
- flush_tlb_mm_range(poking_mm, poking_addr, poking_addr +
- (cross_page_boundary ? 2 : 1) * PAGE_SIZE,
- PAGE_SHIFT, false);
+ pte_clear(poking_mm, poking_addr, ptep);
+ if (cross_page_boundary)
+ pte_clear(poking_mm, poking_addr + PAGE_SIZE, ptep + 1);
+
+ /*
+ * Loading the previous page-table hierarchy requires a
serializing
+ * instruction that already allows the core to see the updated
version.
+ * Xen-PV is assumed to serialize execution in a similar manner.
+ */
+ unuse_temporary_mm(prev);
+
+ /*
+ * Flushing the TLB might involve IPIs, which would require
enabled
+ * IRQs, but not if the mm is not used, as it is in this point.
+ */
+
+ flush_tlb_mm_range(poking_mm, poking_addr, poking_addr +
+ (cross_page_boundary ? 2 : 1) *
size_in_poking_mm,
+ PAGE_SHIFT, false);
+ if (!has_replica)
+ break;
+ }
if (func == text_poke_memcpy) {
/*
--
2.34.1
