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-rw-r--r--target/i386/tcg/misc_helper.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/target/i386/tcg/misc_helper.c b/target/i386/tcg/misc_helper.c
index 90b87fdef0..a25428c36e 100644
--- a/target/i386/tcg/misc_helper.c
+++ b/target/i386/tcg/misc_helper.c
@@ -167,6 +167,10 @@ void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
cpu_x86_update_cr3(env, t0);
break;
case 4:
+ if (((t0 ^ env->cr[4]) & CR4_LA57_MASK) &&
+ (env->hflags & HF_CS64_MASK)) {
+ raise_exception_ra(env, EXCP0D_GPF, GETPC());
+ }
cpu_x86_update_cr4(env, t0);
break;
case 8: