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target/arm: relax permission checks for HWCAP_CPUID registers

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Although technically not visible to userspace the kernel does make
them visible via a trap and emulate ABI. We provide a new permission
mask (PL0U_R) which maps to PL0_R for CONFIG_USER builds and adjust
the minimum permission check accordingly.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20190205190224.2198-2-alex.bennee@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Alex Bennée 2019-02-15 09:56:38 +00:00 • committed by Peter Maydell
parent abd5abc58c
commit b5bd744042
2 changed files with 17 additions and 1 deletions
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6
target/arm/helper.c
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@ -6857,7 +6857,11 @@ void define_one_arm_cp_reg_with_opaque(ARMCPU *cpu,
if (r->state != ARM_CP_STATE_AA32) {
int mask = 0;
switch (r->opc1) {
case 0: case 1: case 2:
case 0:
/* min_EL EL1, but some accessible to EL0 via kernel ABI */
mask = PL0U_R | PL1_RW;
break;
case 1: case 2:
/* min_EL EL1 */
mask = PL1_RW;
break;