https://github.com/VirtualBox/virtualbox/commit/280303b3f03d7087b9c955088a3cf499414f6ec1

From 280303b3f03d7087b9c955088a3cf499414f6ec1 Mon Sep 17 00:00:00 2001
From: Vadim Galitsyn <vadim.galitsyn@oracle.com>
Date: Tue, 17 Feb 2026 15:00:09 +0000
Subject: [PATCH] Linux host: Introduce initial support for kernel 6.19
 bugref:11038.

svn:sync-xref-src-repo-rev: r172809
--- a/vboxguest/r0drv/linux/initterm-r0drv-linux.c
+++ b/vboxguest/r0drv/linux/initterm-r0drv-linux.c
@@ -60,6 +60,11 @@ static DECLARE_TASK_QUEUE(g_rtR0LnxWorkQueue);
  * This is a special mm structure used to manage the kernel address space. */
 struct mm_struct *g_pLnxInitMm = NULL;
 
+#if RTLNX_VER_MIN(6,19,0)
+/** Pointer to __flush_tlb_all kernel symbol. */
+void (*g_pfnLinuxFlushTlbAll)(void);
+#endif
+
 
 /**
  * Pushes an item onto the IPRT work queue.
@@ -136,6 +141,11 @@ DECLHIDDEN(int) rtR0InitNative(void)
             printk("rtR0InitNative: g_pLnxInitMm=%p\n", g_pLnxInitMm);
 
             RTR0DbgKrnlInfoRelease(hKrnlInfo);
+# if RTLNX_VER_MIN(6,19,0)
+            g_pfnLinuxFlushTlbAll = __symbol_get("__flush_tlb_all");
+            if (!RT_VALID_PTR(g_pfnLinuxFlushTlbAll))
+                printk("rtR0InitNative: can't load __flush_tlb_all\n");
+# endif
         }
         else
             printk("rtR0InitNative: RTR0DbgKrnlInfoOpen failed: %d\n", rc);
@@ -151,6 +161,12 @@ DECLHIDDEN(void) rtR0TermNative(void)
 {
     IPRT_LINUX_SAVE_EFL_AC();
 
+# if RTLNX_VER_MIN(6,19,0)
+    if (RT_VALID_PTR(g_pfnLinuxFlushTlbAll))
+        symbol_put_addr(g_pfnLinuxFlushTlbAll);
+    g_pfnLinuxFlushTlbAll = NULL;
+#endif
+
     rtR0LnxWorkqueueFlush();
 #if RTLNX_VER_MIN(2,5,41)
     destroy_workqueue(g_prtR0LnxWorkQueue);
--- a/vboxguest/r0drv/linux/memobj-r0drv-linux.c
+++ b/vboxguest/r0drv/linux/memobj-r0drv-linux.c
@@ -181,7 +181,7 @@ static const struct
 *   Internal Functions                                                                                                           *
 *********************************************************************************************************************************/
 static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx);
-
+static void rtR0MemObjLinuxFlushTlbAll(void);
 
 
 /**
@@ -2245,6 +2245,15 @@ DECLHIDDEN(int) rtR0MemObjNativeMapUser(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ p
     return rc;
 }
 
+static void rtR0MemObjLinuxFlushTlbAll(void)
+{
+#if RTLNX_VER_MIN(6,19,0)
+    if (RT_LIKELY(RT_VALID_PTR(g_pfnLinuxFlushTlbAll)))
+        g_pfnLinuxFlushTlbAll();
+#else
+    __flush_tlb_all();
+#endif
+}
 
 DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub, size_t cbSub, uint32_t fProt)
 {
@@ -2265,7 +2274,7 @@ DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub,
             set_pte(papPtes[i], mk_pte(pMemLnx->apPages[i], fPg));
         }
         preempt_disable();
-        __flush_tlb_all();
+        rtR0MemObjLinuxFlushTlbAll();
         preempt_enable();
         return VINF_SUCCESS;
     }
@@ -2311,7 +2320,7 @@ DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub,
             flush_icache_range((uintptr_t)pMemLnx->Core.pv + offSub, cbSub);
 #  if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) /* flush_tlb_kernel_range is not exported, but __flush_tlb_all is. */
         preempt_disable();
-        __flush_tlb_all();
+        rtR0MemObjLinuxFlushTlbAll();
         preempt_enable();
 #  else
         flush_tlb_kernel_range((uintptr_t)pMemLnx->Core.pv + offSub, cbSub);
--- a/vboxsf/r0drv/linux/the-linux-kernel.h
+++ b/vboxsf/r0drv/linux/the-linux-kernel.h
@@ -512,6 +512,9 @@ RTDECL(struct page *) rtR0MemObjLinuxVirtToPage(void *pv);
 
 
 extern struct mm_struct *g_pLnxInitMm;
+#if RTLNX_VER_MIN(6,19,0)
+extern void (*g_pfnLinuxFlushTlbAll)(void);
+#endif
 
 
 #endif /* !IPRT_INCLUDED_SRC_r0drv_linux_the_linux_kernel_h */
--- a/vboxguest/r0drv/linux/the-linux-kernel.h
+++ b/vboxguest/r0drv/linux/the-linux-kernel.h
@@ -512,6 +512,9 @@ RTDECL(struct page *) rtR0MemObjLinuxVirtToPage(void *pv);
 
 
 extern struct mm_struct *g_pLnxInitMm;
+#if RTLNX_VER_MIN(6,19,0)
+extern void (*g_pfnLinuxFlushTlbAll)(void);
+#endif
 
 
 #endif /* !IPRT_INCLUDED_SRC_r0drv_linux_the_linux_kernel_h */