Merge: mm: backport of proactive fixes

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6650

JIRA: https://issues.redhat.com/browse/RHEL-78989
JIRA: https://issues.redhat.com/browse/RHEL-80529
JIRA: https://issues.redhat.com/browse/RHEL-83249
JIRA: https://issues.redhat.com/browse/RHEL-84184
CVE: CVE-2025-21691
CVE: CVE-2025-21696
CVE: CVE-2025-21861

Proactively backport a set of selected follow-up Fixes for the
MM patches previously backported into RHEL-9 minor releases.
Dependencies and follow-up fixes for the selected commits
are also selectively backported.

Omitted-fix: e080a26 ("erofs: allow large folios for compressed files")
Omitted-fix: 3488af0 ("mm/damon/core: handle zero {aggregation,ops_update} intervals")
Omitted-fix: 5e06ad5 ("mm/damon/core-test: test max_nr_accesses overflow caused divide-by-zero")
Omitted-fix: 25e8acb ("mm/damon/tests/core-kunit: skip damon_test_nr_accesses_to_accesses_bp() if aggr_interval is zero")
Omitted-fix: 1390a33 ("mm/hugetlb: fix kernel NULL pointer dereference when migrating hugetlb folio")
Omitted-fix: 7ddeb91 ("mm: kmemleak: add support for dumping physical and __percpu object info")

Signed-off-by: Rafael Aquini <raquini@redhat.com>

Approved-by: David Arcari <darcari@redhat.com>
Approved-by: Čestmír Kalina <ckalina@redhat.com>
Approved-by: Herton R. Krzesinski <herton@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>

Author: caringi

arch/s390/include/asm/set_memory.h

@@ -62,5 +62,6 @@ __SET_MEMORY_FUNC(set_memory_4k, SET_MEMORY_4K)
 
 int set_direct_map_invalid_noflush(struct page *page);
 int set_direct_map_default_noflush(struct page *page);
+bool kernel_page_present(struct page *page);
 
 #endif

arch/s390/mm/pageattr.c

@@ -406,6 +406,21 @@ int set_direct_map_default_noflush(struct page *page)
 	return __set_memory((unsigned long)page_to_virt(page), 1, SET_MEMORY_DEF);
 }
 
+bool kernel_page_present(struct page *page)
+{
+	unsigned long addr;
+	unsigned int cc;
+
+	addr = (unsigned long)page_address(page);
+	asm volatile(
+		"	lra	%[addr],0(%[addr])\n"
+		"	ipm	%[cc]\n"
+		: [cc] "=d" (cc), [addr] "+a" (addr)
+		:
+		: "cc");
+	return (cc >> 28) == 0;
+}
+
 #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_KFENCE)
 
 static void ipte_range(pte_t *pte, unsigned long address, int nr)

arch/sparc/include/asm/pgtable_64.h

@@ -941,7 +941,7 @@ static inline void __set_pte_at(struct mm_struct *mm, unsigned long addr,
 
 #ifdef DCACHE_ALIASING_POSSIBLE
 #define __HAVE_ARCH_MOVE_PTE
-#define move_pte(pte, prot, old_addr, new_addr)				\
+#define move_pte(pte, old_addr, new_addr)				\
 ({									\
 	pte_t newpte = (pte);						\
 	if (tlb_type != hypervisor && pte_present(pte)) {		\

arch/um/include/asm/kasan.h

@@ -24,7 +24,6 @@
 
 #ifdef CONFIG_KASAN
 void kasan_init(void);
-void kasan_map_memory(void *start, unsigned long len);
 extern int kasan_um_is_ready;
 
 #ifdef CONFIG_STATIC_LINK

arch/um/include/shared/kern_util.h

@@ -69,4 +69,6 @@ extern void fatal_sigsegv(void) __attribute__ ((noreturn));
 
 void um_idle_sleep(void);
 
+void kasan_map_memory(void *start, size_t len);
+
 #endif

arch/um/os-Linux/mem.c

@@ -15,6 +15,7 @@
 #include <sys/vfs.h>
 #include <linux/magic.h>
 #include <init.h>
+#include <kern_util.h>
 #include <os.h>
 
 /*

arch/x86/kernel/cpu/vmware.c

@@ -26,6 +26,7 @@
 #include <linux/export.h>
 #include <linux/clocksource.h>
 #include <linux/cpu.h>
+#include <linux/efi.h>
 #include <linux/reboot.h>
 #include <linux/static_call.h>
 #include <asm/div64.h>
@@ -429,6 +430,9 @@ static void __init vmware_platform_setup(void)
 		pr_warn("Failed to get TSC freq from the hypervisor\n");
 	}
 
+	if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP) && !efi_enabled(EFI_BOOT))
+		x86_init.mpparse.find_mptable = mpparse_find_mptable;
+
 	vmware_paravirt_ops_setup();
 
 #ifdef CONFIG_X86_IO_APIC

arch/x86/kernel/kvm.c

@@ -435,7 +435,8 @@ static void __init sev_map_percpu_data(void)
 {
 	int cpu;
 
-	if (!cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+	if (cc_vendor != CC_VENDOR_AMD ||
+	    !cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
 		return;
 
 	for_each_possible_cpu(cpu) {

arch/x86/mm/tlb.c

@@ -494,10 +494,10 @@ static inline void cr4_update_pce_mm(struct mm_struct *mm) { }
 #endif
 
 /*
- * The "prev" argument passed by the caller does not always match CR3. For
- * example, the scheduler passes in active_mm when switching from lazy TLB mode
- * to normal mode, but switch_mm_irqs_off() can be called from x86 code without
- * updating active_mm. Use cpu_tlbstate.loaded_mm instead.
+ * This optimizes when not actually switching mm's.  Some architectures use the
+ * 'unused' argument for this optimization, but x86 must use
+ * 'cpu_tlbstate.loaded_mm' instead because it does not always keep
+ * 'current->active_mm' up to date.
  */
 void switch_mm_irqs_off(struct mm_struct *unused, struct mm_struct *next,
 			struct task_struct *tsk)

drivers/of/of_reserved_mem.c

@@ -50,7 +50,8 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 			memblock_phys_free(base, size);
 	}
 
-	kmemleak_ignore_phys(base);
+	if (!err)
+		kmemleak_ignore_phys(base);
 
 	return err;
 }