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hw/intc/arm_gicv3: Fix secure-GIC NS ICC_PMR and ICC_RPR accesses 

If the GIC has the security extension support enabled, then a
non-secure access to ICC_PMR must take account of the non-secure
view of interrupt priorities, where real priorities 0x00..0x7f
are secure-only and not visible to the non-secure guest, and
priorities 0x80..0xff are shown to the guest as if they were
0x00..0xff. We had the logic here wrong:
 * on reads, the priority is in the secure range if bit 7
   is clear, not if it is set
 * on writes, we want to set bit 7, not mask everything else

Our ICC_RPR read code had the same error as ICC_PMR.

(Compare the GICv3 spec pseudocode functions ICC_RPR_EL1
and ICC_PMR_EL1.)

Fixes: https://bugs.launchpad.net/qemu/+bug/1748434
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 20180315133441.24149-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2018-03-23 18:26:45 +00:00
parent 544156efcf
commit a2e2d7fc46
1 changed files with 3 additions and 3 deletions
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6
hw/intc/arm_gicv3_cpuif.c
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@ -836,7 +836,7 @@ static uint64_t icc_pmr_read(CPUARMState *env, const ARMCPRegInfo *ri)
/* NS access and Group 0 is inaccessible to NS: return the
* NS view of the current priority
*/
if (value & 0x80) {
if ((value & 0x80) == 0) {
/* Secure priorities not visible to NS */
value = 0;
} else if (value != 0xff) {
@ -871,7 +871,7 @@ static void icc_pmr_write(CPUARMState *env, const ARMCPRegInfo *ri,
/* Current PMR in the secure range, don't allow NS to change it */
return;
}
value = (value >> 1) & 0x80;
value = (value >> 1) | 0x80;
}
cs->icc_pmr_el1 = value;
gicv3_cpuif_update(cs);
@ -1609,7 +1609,7 @@ static uint64_t icc_rpr_read(CPUARMState *env, const ARMCPRegInfo *ri)
if (arm_feature(env, ARM_FEATURE_EL3) &&
!arm_is_secure(env) && (env->cp15.scr_el3 & SCR_FIQ)) {
/* NS GIC access and Group 0 is inaccessible to NS */
if (prio & 0x80) {
if ((prio & 0x80) == 0) {
/* NS mustn't see priorities in the Secure half of the range */
prio = 0;
} else if (prio != 0xff) {