Export two more functions needed for cleanup

When a VM gets stopped or terminated, the guest memory should be
unmapped and free. This will allow mm struct to be destroyed without any
problem. For that purspose we need to export 2 more functions:
- insert_vm_struct
- do_munmap

Signed-off-by: Charalampos Mainas <[email protected]>

Author: cmainas

v5.7/0002-Export-vma-allocation-related-functions.patch

@@ -1,6 +1,6 @@
-From d596c44ab5aa5fc4834908b24ac6f1628a023d73 Mon Sep 17 00:00:00 2001
-From: Charalampos Mainas <cmainas@nubificus.com>
-Date: Tue, 15 Jun 2021 13:31:24 +0000
+From ecd2fc90bb769c4f73a6f742d704217965f69f5c Mon Sep 17 00:00:00 2001
+From: Charalampos Mainas <charalampos.mainas@gmail.com>
+Date: Tue, 31 Aug 2021 00:02:50 +0300
 Subject: [PATCH 2/2] Export vma allocation related functions
 
 KVMM guests use kernel allocated memory, which is obtained by vmalloc.
@@ -22,8 +22,9 @@ Signed-off-by: Stratos Psomadakis <[email protected]>
 ---
  arch/x86/mm/mmap.c | 1 +
  kernel/fork.c      | 3 +++
+ mm/mmap.c          | 2 ++
  mm/util.c          | 1 +
- 3 files changed, 5 insertions(+)
+ 4 files changed, 7 insertions(+)
 
 diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
 index cb91eccc4..e9a285113 100644
@@ -65,6 +66,26 @@ index 48ed22774..6386b48e1 100644
 
  static inline void __mmput(struct mm_struct *mm)
  {
+diff --git a/mm/mmap.c b/mm/mmap.c
+index f609e9ec4..ddd422fdd 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -2843,6 +2843,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
+ {
+ 	return __do_munmap(mm, start, len, uf, false);
+ }
++EXPORT_SYMBOL(do_munmap);
+ 
+ static int __vm_munmap(unsigned long start, size_t len, bool downgrade)
+ {
+@@ -3199,6 +3200,7 @@ int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma)
+ 	vma_link(mm, vma, prev, rb_link, rb_parent);
+ 	return 0;
+ }
++EXPORT_SYMBOL(insert_vm_struct);
+ 
+ /*
+  * Copy the vma structure to a new location in the same mm,
 diff --git a/mm/util.c b/mm/util.c
 index 988d11e6c..267ac25d7 100644
 --- a/mm/util.c
@@ -78,5 +99,5 @@ index 988d11e6c..267ac25d7 100644
  void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
  {
 -- 
-2.31.1
+2.32.0
 

v5.8/0002-Export-vma-allocation-related-functions.patch

@@ -1,6 +1,6 @@
-From ba09c34ac998d7077525f95dc07d2343f2b66849 Mon Sep 17 00:00:00 2001
+From 2dcf0c06d4ad551618c29a73962ae16741ae9989 Mon Sep 17 00:00:00 2001
 From: Charalampos Mainas <[email protected]>
-Date: Fri, 25 Jun 2021 10:53:35 +0300
+Date: Mon, 23 Aug 2021 00:13:45 +0300
 Subject: [PATCH 2/2] Export vma allocation related functions
 
 KVMM guests use kernel allocated memory, which is obtained by vmalloc.
@@ -22,8 +22,9 @@ Signed-off-by: Stratos Psomadakis <[email protected]>
 ---
  arch/x86/mm/mmap.c | 1 +
  kernel/fork.c      | 3 +++
+ mm/mmap.c          | 2 ++
  mm/util.c          | 1 +
- 3 files changed, 5 insertions(+)
+ 4 files changed, 7 insertions(+)
 
 diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
 index c90c20904..9775fcf10 100644
@@ -65,6 +66,26 @@ index efc549320..fc5f37e96 100644
 
  static inline void __mmput(struct mm_struct *mm)
  {
+diff --git a/mm/mmap.c b/mm/mmap.c
+index 8c7ca737a..7bd118999 100644
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -2855,6 +2855,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len,
+ {
+ 	return __do_munmap(mm, start, len, uf, false);
+ }
++EXPORT_SYMBOL(do_munmap);
+ 
+ static int __vm_munmap(unsigned long start, size_t len, bool downgrade)
+ {
+@@ -3211,6 +3212,7 @@ int insert_vm_struct(struct mm_struct *mm, struct vm_area_struct *vma)
+ 	vma_link(mm, vma, prev, rb_link, rb_parent);
+ 	return 0;
+ }
++EXPORT_SYMBOL(insert_vm_struct);
+ 
+ /*
+  * Copy the vma structure to a new location in the same mm,
 diff --git a/mm/util.c b/mm/util.c
 index c63c8e47b..adb15372c 100644
 --- a/mm/util.c