Large page TLB flush

QEMU uses a fixed page size for the CPU TLB.  If the guest uses large
pages then we effectively split these into multiple smaller pages, and
populate the corresponding TLB entries on demand.

When the guest invalidates the TLB by virtual address we must invalidate
all entries covered by the large page.  However the address used to
invalidate the entry may not be present in the QEMU TLB, so we do not
know which regions to clear.

Implementing a full vaiable size TLB is hard and slow, so just keep a
simple address/mask pair to record which addresses may have been mapped by
large pages.  If the guest invalidates this region then flush the
whole TLB.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/target-s390x/helper.c b/target-s390x/helper.c
index b97d1ff..ba0c052 100644
--- a/target-s390x/helper.c
+++ b/target-s390x/helper.c
@@ -69,10 +69,11 @@ int cpu_s390x_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
     /* XXX: implement mmu */
 
     phys = address;
-    prot = PAGE_READ | PAGE_WRITE;
+    prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 
-    return tlb_set_page(env, address & TARGET_PAGE_MASK,
-                        phys & TARGET_PAGE_MASK, prot,
-                        mmu_idx, is_softmmu);
+    tlb_set_page(env, address & TARGET_PAGE_MASK,
+                 phys & TARGET_PAGE_MASK, prot,
+                 mmu_idx, TARGET_PAGE_SIZE);
+    return 0;
 }
 #endif /* CONFIG_USER_ONLY */