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target/arm: Treat SCTLR_EL1.M as if it were zero when HCR_EL2.TGE is set

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One of the required effects of setting HCR_EL2.TGE is that when
SCR_EL3.NS is 1 then SCTLR_EL1.M must behave as if it is zero for
all purposes except direct reads. That is, it effectively disables
the MMU for the NS EL0/EL1 translation regime.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180724115950.17316-6-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-08-14 17:17:21 +01:00
parent ac656b166b
commit 3d0e3080d8
1 changed files with 8 additions and 0 deletions
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8
target/arm/helper.c
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@ -8396,6 +8396,14 @@ static inline bool regime_translation_disabled(CPUARMState *env,
if (mmu_idx == ARMMMUIdx_S2NS) {
return (env->cp15.hcr_el2 & HCR_VM) == 0;
}
if (env->cp15.hcr_el2 & HCR_TGE) {
/* TGE means that NS EL0/1 act as if SCTLR_EL1.M is zero */
if (!regime_is_secure(env, mmu_idx) && regime_el(env, mmu_idx) == 1) {
return true;
}
}
return (regime_sctlr(env, mmu_idx) & SCTLR_M) == 0;
}