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arm: Don't let no-MPU PMSA cores write to SCTLR.M

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If the CPU is a PMSA config with no MPU implemented, then the
SCTLR.M bit should be RAZ/WI, so that the guest can never
turn on the non-existent MPU.

Backports commit 06312febfb2d35367006ef23608ddd6a131214d4 from qemu
This commit is contained in:
Peter Maydell 2018-03-02 19:13:34 -05:00 committed by Lioncash
parent e564ed6311
commit 349227bb05
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 0 deletions
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5
qemu/target/arm/helper.c
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@ -2984,6 +2984,11 @@ static void sctlr_write(CPUARMState *env, const ARMCPRegInfo *ri,
return;
}
if (arm_feature(env, ARM_FEATURE_PMSA) && !cpu->has_mpu) {
/* M bit is RAZ/WI for PMSA with no MPU implemented */
value &= ~SCTLR_M;
}
raw_write(env, ri, value);
/* ??? Lots of these bits are not implemented. */
/* This may enable/disable the MMU, so do a TLB flush. */