[Stable-8.2.3 35/87] target/i386: introduce function to query MMU indices

[Michael Tokarev]

From: Paolo Bonzini <pbonz...@redhat.com>

Remove knowledge of specific MMU indexes (other than MMU_NESTED_IDX and
MMU_PHYS_IDX) from mmu_translate().  This will make it possible to split
32-bit and 64-bit MMU indexes.

Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
(cherry picked from commit 5f97afe2543f09160a8d123ab6e2e8c6d98fa9ce)
Signed-off-by: Michael Tokarev <m...@tls.msk.ru>
(Mjt: context fixup in target/i386/cpu.h due to other changes in that area)

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 705d925e6c..df1f602758 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -2302,6 +2302,16 @@ static inline int cpu_mmu_index(CPUX86State *env, bool 
ifetch)
         ? MMU_KNOSMAP_IDX : MMU_KSMAP_IDX;
 }
 
+static inline bool is_mmu_index_smap(int mmu_index)
+{
+    return mmu_index == MMU_KSMAP_IDX;
+}
+
+static inline bool is_mmu_index_user(int mmu_index)
+{
+    return mmu_index == MMU_USER_IDX;
+}
+
 static inline bool is_mmu_index_32(int mmu_index)
 {
     assert(mmu_index < MMU_PHYS_IDX);
diff --git a/target/i386/tcg/sysemu/excp_helper.c 
b/target/i386/tcg/sysemu/excp_helper.c
index e16d3a69d1..18fde700c1 100644
--- a/target/i386/tcg/sysemu/excp_helper.c
+++ b/target/i386/tcg/sysemu/excp_helper.c
@@ -136,7 +136,7 @@ static bool mmu_translate(CPUX86State *env, const 
TranslateParams *in,
 {
     const target_ulong addr = in->addr;
     const int pg_mode = in->pg_mode;
-    const bool is_user = (in->mmu_idx == MMU_USER_IDX);
+    const bool is_user = is_mmu_index_user(in->mmu_idx);
     const MMUAccessType access_type = in->access_type;
     uint64_t ptep, pte, rsvd_mask;
     PTETranslate pte_trans = {
@@ -357,7 +357,7 @@ do_check_protect_pse36:
     }
 
     int prot = 0;
-    if (in->mmu_idx != MMU_KSMAP_IDX || !(ptep & PG_USER_MASK)) {
+    if (!is_mmu_index_smap(in->mmu_idx) || !(ptep & PG_USER_MASK)) {
         prot |= PAGE_READ;
         if ((ptep & PG_RW_MASK) || !(is_user || (pg_mode & PG_MODE_WP))) {
             prot |= PAGE_WRITE;
-- 
2.39.2