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target/i386: fail if toggling LA57 in 64-bit mode

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This fixes kvm-unit-tests access.flat with -cpu qemu64,la57.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-03-18 09:42:32 -04:00
parent b818413583
commit da3f3b020f
1 changed files with 4 additions and 0 deletions
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4
target/i386/tcg/misc_helper.c
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@ -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: