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target-arm: powerctl: Enable HVC when starting CPUs to EL2

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When QEMU provides the equivalent of the EL3 firmware, we
need to enable HVCs in scr_el3 when turning on CPUs that
target EL2.

Backports commit 86278c33d1d71196f5e22ce3ce82a1b34a199754 from qemu
This commit is contained in:
Edgar E. Iglesias 2018-10-23 12:48:03 -04:00 committed by Lioncash
parent 3b3bce7d4e
commit fa9828845f
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1 changed files with 10 additions and 0 deletions
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10
qemu/target/arm/arm-powerctl.c
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@ -155,6 +155,16 @@ int arm_set_cpu_on(struct uc_struct *uc,
} else {
/* Processor is not in secure mode */
target_cpu->env.cp15.scr_el3 |= SCR_NS;
/*
* If QEMU is providing the equivalent of EL3 firmware, then we need
* to make sure a CPU targeting EL2 comes out of reset with a
* functional HVC insn.
*/
if (arm_feature(&target_cpu->env, ARM_FEATURE_EL3)
&& target_el == 2) {
target_cpu->env.cp15.scr_el3 |= SCR_HCE;
}
}
/* We check if the started CPU is now at the correct level */