[Stable-8.2.8 49/61] target/i386: Fix legacy page table walk

[Michael Tokarev]

From: Alexander Graf <graf@amazon.com>

Commit b56617bbcb4 ("target/i386: Walk NPT in guest real mode") added
logic to run the page table walker even in real mode if we are in NPT
mode.  That function then determined whether real mode or paging is
active based on whether the pg_mode variable was 0.

Unfortunately pg_mode is 0 in two situations:

  1) Paging is disabled (real mode)
  2) Paging is in 2-level paging mode (32bit without PAE)

That means the walker now assumed that 2-level paging mode was real
mode, breaking NetBSD as well as Windows XP.

To fix that, this patch adds a new PG flag to pg_mode which indicates
whether paging is active at all and uses that to determine whether we
are in real mode or not.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2654
Fixes: b56617bbcb4 ("target/i386: Walk NPT in guest real mode")
Fixes: 253c0a06e03 (commit b56617bbcb4 in stable-8.2.x series)
Signed-off-by: Alexander Graf <graf@amazon.com>
Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Link: 20241106154329.67218-1-graf@amazon.com">https://lore.kernel.org/r/20241106154329.67218-1-graf@amazon.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 8fa11a4df344f58375eb26b3b65004345f21ef37)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 2f1e7425a3..ecc0ae3033 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -339,6 +339,7 @@ typedef enum X86Seg {
 #define PG_MODE_PKE      (1 << 17)
 #define PG_MODE_PKS      (1 << 18)
 #define PG_MODE_SMEP     (1 << 19)
+#define PG_MODE_PG       (1 << 20)
 
 #define MCG_CTL_P       (1ULL<<8)   /* MCG_CAP register available */
 #define MCG_SER_P       (1ULL<<24) /* MCA recovery/new status bits */
diff --git a/target/i386/tcg/seg_helper.c b/target/i386/tcg/seg_helper.c
index eb29a1fd4e..121975eac3 100644
--- a/target/i386/tcg/seg_helper.c
+++ b/target/i386/tcg/seg_helper.c
@@ -30,7 +30,7 @@
 
 int get_pg_mode(CPUX86State *env)
 {
-    int pg_mode = 0;
+    int pg_mode = PG_MODE_PG;
     if (!(env->cr[0] & CR0_PG_MASK)) {
         return 0;
     }
diff --git a/target/i386/tcg/sysemu/excp_helper.c 
b/target/i386/tcg/sysemu/excp_helper.c
index 31c5032ace..bdf7b0df42 100644
--- a/target/i386/tcg/sysemu/excp_helper.c
+++ b/target/i386/tcg/sysemu/excp_helper.c
@@ -297,7 +297,7 @@ static bool mmu_translate(CPUX86State *env, const 
TranslateParams *in,
         /* combine pde and pte nx, user and rw protections */
         ptep &= pte ^ PG_NX_MASK;
         page_size = 4096;
-    } else if (pg_mode) {
+    } else if (pg_mode & PG_MODE_PG) {
         /*
          * Page table level 2
          */
-- 
2.39.5