1 files changed, 77 insertions, 10 deletions

diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
index 27eb29ce666b..c0f0693743ba 100644
--- a/arch/um/kernel/skas/tlb.c
+++ b/arch/um/kernel/skas/tlb.c
@@ -10,7 +10,6 @@
 #include "asm/page.h"
 #include "asm/pgtable.h"
 #include "asm/mmu.h"
-#include "user_util.h"
 #include "mem_user.h"
 #include "mem.h"
 #include "skas.h"
@@ -28,19 +27,17 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
                 switch(op->type){
                 case MMAP:
                         ret = map(&mmu->skas.id, op->u.mmap.addr,
-                                  op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
-                                  op->u.mmap.x, op->u.mmap.fd,
-                                  op->u.mmap.offset, finished, flush);
+                                  op->u.mmap.len, op->u.mmap.prot,
+                                  op->u.mmap.fd, op->u.mmap.offset, finished,
+                                  flush);
                         break;
                 case MUNMAP:
-                        ret = unmap(&mmu->skas.id,
-                                    (void *) op->u.munmap.addr,
+                        ret = unmap(&mmu->skas.id, op->u.munmap.addr,
                                     op->u.munmap.len, finished, flush);
                         break;
                 case MPROTECT:
                         ret = protect(&mmu->skas.id, op->u.mprotect.addr,
-                                      op->u.mprotect.len, op->u.mprotect.r,
-                                      op->u.mprotect.w, op->u.mprotect.x,
+                                      op->u.mprotect.len, op->u.mprotect.prot,
                                       finished, flush);
                         break;
                 default:
@@ -92,6 +89,76 @@ void flush_tlb_mm_skas(struct mm_struct *mm)
 
 void force_flush_all_skas(void)
 {
-        unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
-        fix_range(current->mm, 0, end, 1);
+        struct mm_struct *mm = current->mm;
+        struct vm_area_struct *vma = mm->mmap;
+
+        while(vma != NULL) {
+                fix_range(mm, vma->vm_start, vma->vm_end, 1);
+                vma = vma->vm_next;
+        }
+}
+
+void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
+{
+        pgd_t *pgd;
+        pud_t *pud;
+        pmd_t *pmd;
+        pte_t *pte;
+        struct mm_struct *mm = vma->vm_mm;
+        void *flush = NULL;
+        int r, w, x, prot, err = 0;
+        struct mm_id *mm_id;
+
+        pgd = pgd_offset(mm, address);
+        if(!pgd_present(*pgd))
+                goto kill;
+
+        pud = pud_offset(pgd, address);
+        if(!pud_present(*pud))
+                goto kill;
+
+        pmd = pmd_offset(pud, address);
+        if(!pmd_present(*pmd))
+                goto kill;
+
+        pte = pte_offset_kernel(pmd, address);
+
+        r = pte_read(*pte);
+        w = pte_write(*pte);
+        x = pte_exec(*pte);
+        if (!pte_young(*pte)) {
+                r = 0;
+                w = 0;
+        } else if (!pte_dirty(*pte)) {
+                w = 0;
+        }
+
+        mm_id = &mm->context.skas.id;
+        prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+                (x ? UM_PROT_EXEC : 0));
+        if(pte_newpage(*pte)){
+                if(pte_present(*pte)){
+                        unsigned long long offset;
+                        int fd;
+
+                        fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
+                        err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+                                  1, &flush);
+                }
+                else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
+        }
+        else if(pte_newprot(*pte))
+                err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
+
+        if(err)
+                goto kill;
+
+        *pte = pte_mkuptodate(*pte);
+
+        return;
+
+kill:
+        printk("Failed to flush page for address 0x%lx\n", address);
+        force_sig(SIGKILL, current);
 }
+