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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.

Backports commit 3d0e3080d8b7abcddc038d18e8401861c369c4c1 from qemu
This commit is contained in:
Peter Maydell 2018-08-16 06:46:04 -04:00 committed by Lioncash
parent 12248b8685
commit c79ebe4965
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 8 additions and 0 deletions
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8
qemu/target/arm/helper.c
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@ -7622,6 +7622,14 @@ 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;
}