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target/arm: Enable MTE for user-only

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Backports e32328645ed6fc4f20f0164dfc9ce1bf7e667cc4
This commit is contained in:
Richard Henderson 2021-03-04 18:46:45 -05:00 committed by Lioncash
parent c588c150e4
commit d044062b26
1 changed files with 15 additions and 0 deletions
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15
qemu/target/arm/cpu.c
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@ -201,6 +201,21 @@ static void arm_cpu_reset(CPUState *s)
* Note that this must match useronly_clean_ptr.
*/
env->cp15.tcr_el[1].raw_tcr = (1ULL << 37);
/* Enable MTE */
if (cpu_isar_feature(aa64_mte, cpu)) {
/* Enable tag access, but leave TCF0 as No Effect (0). */
env->cp15.sctlr_el[1] |= SCTLR_ATA0;
/*
* Exclude all tags, so that tag 0 is always used.
* This corresponds to Linux current->thread.gcr_incl = 0.
*
* Set RRND, so that helper_irg() will generate a seed later.
* Here in cpu_reset(), the crypto subsystem has not yet been
* initialized.
*/
env->cp15.gcr_el1 = 0x1ffff;
}
#else
/* Reset into the highest available EL */
if (arm_feature(env, ARM_FEATURE_EL3)) {