see possible solution, in #if 0 is original code in #else see possible
fix
static uint64_t icc_pmr_read(CPUARMState *env, const ARMCPRegInfo *ri)
....
#if 0 // KIURCHER: bug - shall be opposite; see ARM specification
if (value & 0x80) {
/* Secure priorities not visible to NS */
value = 0;
} else if (value != 0xff) {
value = (value << 1) & 0xff;
}
#else
if (value & 0x80) {
value = (value << 1) & 0xff;
} else {
value = 0;
}
#endif
....
static void icc_pmr_write(CPUARMState *env, const ARMCPRegInfo *ri,
uint64_t value)
....
#if 0 //KIURCHER: bug
if (arm_feature(env, ARM_FEATURE_EL3) && !arm_is_secure(env) &&
(env->cp15.scr_el3 & SCR_FIQ)) {
/* NS access and Group 0 is inaccessible to NS: return the
* NS view of the current priority
*/
if (!(cs->icc_pmr_el1 & 0x80)) {
/* Current PMR in the secure range, don't allow NS to change it */
return;
}
value = (value >> 1) & 0x80;
}
#else
if (arm_feature(env, ARM_FEATURE_EL3) && !arm_is_secure(env) &&
(env->cp15.scr_el3 & SCR_FIQ)) {
/* NS access and Group 0 is inaccessible to NS: return the
* NS view of the current priority
*/
if (!(cs->icc_pmr_el1 & 0x80)) {
/* Current PMR in the secure range, don't allow NS to change it */
return;
}
value = (value >> 1) | 0x80;
}
#endif
--
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https://bugs.launchpad.net/bugs/1748434
Title:
Possibly wrong GICv3 behavior when secure enabled
Status in QEMU:
New
Bug description:
I an tried arm-aarch64 interrupt routing to EL3, by SCR_EL3.FIQ=1. First I am
started QEMU with secure=on and GICv3 support.
I programmed secure and non-secure timers and set-up appropriate
interrupts.Secure timer to be GRP1_Secure and non-secure timer to be
GRP1_NonSecure. ICC_PMR = 0xff. Then I switched CPU to EL1.
With that setup no interrupt was delivered to PE. GIC interface showed that
non secure IRQ is pending. ICC_PMR read at EL1 returns 0 (shall return value
((PMR_(el3) << 1) & 0xff) according to GIC specification.
Than I tried to increase interrupt priority mask - so I set ICC_PMR = 0x7f
(at EL3). Then I read at EL1 ICC_PMR=0xfe - (is shall be 0). With this setup
IRQ of secure timer was taken at EL3, non secure timer didn't rise IRQ (as it
is masked by PMR).
I dig to qemu code and see wrong condition in file arm_gicv3_cpuif.c in
function icc_pmr_read(). This behavior is opposite of ARM specification.
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