This only implements the external delivery method via the GICv3.
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
v13:
- Add Reviewed-by.
v12:
- Correct the comment style in arm_cpu_initfn().
v10:
- In arm_cpu_exec_interrupt(), if SCTLR_ELx.NMI is 0, NMI -> IRQ,
VINMI -> VIRQ, VFNMI -> VFIQ.
- Make arm_cpu_update_virq() and arm_cpu_update_vfiq() check that it is not a
VINMI/VFNMI, so only set 1 bit in interrupt_request, not 2.
v9:
- Update the GPIOs passed in the arm_cpu_kvm_set_irq, and update the comment.
- Definitely not merge VINMI and VFNMI into EXCP_VNMI.
- Update VINMI and VFNMI when writing HCR_EL2 or HCRX_EL2.
v8:
- Fix the rcu stall after sending a VNMI in qemu VM.
v7:
- Add Reviewed-by.
v6:
- env->cp15.hcr_el2 -> arm_hcr_el2_eff().
- env->cp15.hcrx_el2 -> arm_hcrx_el2_eff().
- Not include VF && VFNMI in CPU_INTERRUPT_VNMI.
v4:
- Accept NMI unconditionally for arm_cpu_has_work() but add comment.
- Change from & to && for EXCP_IRQ or EXCP_FIQ.
- Refator nmi mask in arm_excp_unmasked().
- Also handle VNMI in arm_cpu_exec_interrupt() and arm_cpu_set_irq().
- Rename virtual to Virtual.
v3:
- Not include CPU_INTERRUPT_NMI when FEAT_NMI not enabled
- Add ARM_CPU_VNMI.
- Refator nmi mask in arm_excp_unmasked().
- Test SCTLR_ELx.NMI for ALLINT mask for NMI.
---
target/arm/cpu-qom.h | 5 +-
target/arm/cpu.c | 147 ++++++++++++++++++++++++++++++++++++++---
target/arm/cpu.h | 6 ++
target/arm/helper.c | 33 +++++++--
target/arm/internals.h | 18 +++++
5 files changed, 193 insertions(+), 16 deletions(-)
diff --git a/target/arm/cpu-qom.h b/target/arm/cpu-qom.h
index 8e032691db..b497667d61 100644
--- a/target/arm/cpu-qom.h
+++ b/target/arm/cpu-qom.h
@@ -36,11 +36,14 @@ DECLARE_CLASS_CHECKERS(AArch64CPUClass, AARCH64_CPU,
#define ARM_CPU_TYPE_SUFFIX "-" TYPE_ARM_CPU
#define ARM_CPU_TYPE_NAME(name) (name ARM_CPU_TYPE_SUFFIX)
-/* Meanings of the ARMCPU object's four inbound GPIO lines */
+/* Meanings of the ARMCPU object's seven inbound GPIO lines */
#define ARM_CPU_IRQ 0
#define ARM_CPU_FIQ 1
#define ARM_CPU_VIRQ 2
#define ARM_CPU_VFIQ 3
+#define ARM_CPU_NMI 4
+#define ARM_CPU_VINMI 5
+#define ARM_CPU_VFNMI 6
/* For M profile, some registers are banked secure vs non-secure;
* these are represented as a 2-element array where the first element
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index ab8d007a86..d2dfd36fd4 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -122,6 +122,13 @@ void arm_restore_state_to_opc(CPUState *cs,
}
#endif /* CONFIG_TCG */
+/*
+ * With SCTLR_ELx.NMI == 0, IRQ with Superpriority is masked identically with
+ * IRQ without Superpriority. Moreover, if the GIC is configured so that
+ * FEAT_GICv3_NMI is only set if FEAT_NMI is set, then we won't ever see
+ * CPU_INTERRUPT_*NMI anyway. So we might as well accept NMI here
+ * unconditionally.
+ */
static bool arm_cpu_has_work(CPUState *cs)
{
ARMCPU *cpu = ARM_CPU(cs);
@@ -129,6 +136,7 @@ static bool arm_cpu_has_work(CPUState *cs)
return (cpu->power_state != PSCI_OFF)
&& cs->interrupt_request &
(CPU_INTERRUPT_FIQ | CPU_INTERRUPT_HARD
+ | CPU_INTERRUPT_NMI | CPU_INTERRUPT_VINMI | CPU_INTERRUPT_VFNMI
| CPU_INTERRUPT_VFIQ | CPU_INTERRUPT_VIRQ | CPU_INTERRUPT_VSERR
| CPU_INTERRUPT_EXITTB);
}
@@ -668,6 +676,7 @@ static inline bool arm_excp_unmasked(CPUState *cs, unsigned int excp_idx,
CPUARMState *env = cpu_env(cs);
bool pstate_unmasked;
bool unmasked = false;
+ bool allIntMask = false;
/*
* Don't take exceptions if they target a lower EL.
@@ -678,13 +687,36 @@ static inline bool arm_excp_unmasked(CPUState *cs, unsigned int excp_idx,
return false;
}
+ if (cpu_isar_feature(aa64_nmi, env_archcpu(env)) &&
+ env->cp15.sctlr_el[target_el] & SCTLR_NMI && cur_el == target_el) {
+ allIntMask = env->pstate & PSTATE_ALLINT ||
+ ((env->cp15.sctlr_el[target_el] & SCTLR_SPINTMASK) &&
+ (env->pstate & PSTATE_SP));
+ }
+
switch (excp_idx) {
+ case EXCP_NMI:
+ pstate_unmasked = !allIntMask;
+ break;
+
+ case EXCP_VINMI:
+ if (!(hcr_el2 & HCR_IMO) || (hcr_el2 & HCR_TGE)) {
+ /* VINMIs are only taken when hypervized. */
+ return false;
+ }
+ return !allIntMask;
+ case EXCP_VFNMI:
+ if (!(hcr_el2 & HCR_FMO) || (hcr_el2 & HCR_TGE)) {
+ /* VFNMIs are only taken when hypervized. */
+ return false;
+ }
+ return !allIntMask;
case EXCP_FIQ:
- pstate_unmasked = !(env->daif & PSTATE_F);
+ pstate_unmasked = (!(env->daif & PSTATE_F)) && (!allIntMask);
break;
case EXCP_IRQ:
- pstate_unmasked = !(env->daif & PSTATE_I);
+ pstate_unmasked = (!(env->daif & PSTATE_I)) && (!allIntMask);
break;
case EXCP_VFIQ:
@@ -692,13 +724,13 @@ static inline bool arm_excp_unmasked(CPUState *cs, unsigned int excp_idx,
/* VFIQs are only taken when hypervized. */
return false;
}
- return !(env->daif & PSTATE_F);
+ return !(env->daif & PSTATE_F) && (!allIntMask);
case EXCP_VIRQ:
if (!(hcr_el2 & HCR_IMO) || (hcr_el2 & HCR_TGE)) {
/* VIRQs are only taken when hypervized. */
return false;
}
- return !(env->daif & PSTATE_I);
+ return !(env->daif & PSTATE_I) && (!allIntMask);
case EXCP_VSERR:
if (!(hcr_el2 & HCR_AMO) || (hcr_el2 & HCR_TGE)) {
/* VIRQs are only taken when hypervized. */
@@ -804,6 +836,48 @@ static bool arm_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
/* The prioritization of interrupts is IMPLEMENTATION DEFINED. */
+ if (cpu_isar_feature(aa64_nmi, env_archcpu(env)) &&
+ (arm_sctlr(env, cur_el) & SCTLR_NMI)) {
+ if (interrupt_request & CPU_INTERRUPT_NMI) {
+ excp_idx = EXCP_NMI;
+ target_el = arm_phys_excp_target_el(cs, excp_idx, cur_el, secure);
+ if (arm_excp_unmasked(cs, excp_idx, target_el,
+ cur_el, secure, hcr_el2)) {
+ goto found;
+ }
+ }
+ if (interrupt_request & CPU_INTERRUPT_VINMI) {
+ excp_idx = EXCP_VINMI;
+ target_el = 1;
+ if (arm_excp_unmasked(cs, excp_idx, target_el,
+ cur_el, secure, hcr_el2)) {
+ goto found;
+ }
+ }
+ if (interrupt_request & CPU_INTERRUPT_VFNMI) {
+ excp_idx = EXCP_VFNMI;
+ target_el = 1;
+ if (arm_excp_unmasked(cs, excp_idx, target_el,
+ cur_el, secure, hcr_el2)) {
+ goto found;
+ }
+ }
+ } else {
+ /*
+ * NMI disabled: interrupts with superpriority are handled
+ * as if they didn't have it
+ */
+ if (interrupt_request & CPU_INTERRUPT_NMI) {
+ interrupt_request |= CPU_INTERRUPT_HARD;
+ }
+ if (interrupt_request & CPU_INTERRUPT_VINMI) {
+ interrupt_request |= CPU_INTERRUPT_VIRQ;
+ }
+ if (interrupt_request & CPU_INTERRUPT_VFNMI) {
+ interrupt_request |= CPU_INTERRUPT_VFIQ;
+ }
+ }
+
if (interrupt_request & CPU_INTERRUPT_FIQ) {
excp_idx = EXCP_FIQ;
target_el = arm_phys_excp_target_el(cs, excp_idx, cur_el, secure);
@@ -867,7 +941,8 @@ void arm_cpu_update_virq(ARMCPU *cpu)
CPUARMState *env = &cpu->env;
CPUState *cs = CPU(cpu);
- bool new_state = (env->cp15.hcr_el2 & HCR_VI) ||
+ bool new_state = ((arm_hcr_el2_eff(env) & HCR_VI) &&
+ !(arm_hcrx_el2_eff(env) & HCRX_VINMI)) ||
(env->irq_line_state & CPU_INTERRUPT_VIRQ);
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VIRQ) != 0)) {
@@ -888,7 +963,8 @@ void arm_cpu_update_vfiq(ARMCPU *cpu)
CPUARMState *env = &cpu->env;
CPUState *cs = CPU(cpu);
- bool new_state = (env->cp15.hcr_el2 & HCR_VF) ||
+ bool new_state = ((arm_hcr_el2_eff(env) & HCR_VF) &&
+ !(arm_hcrx_el2_eff(env) & HCRX_VFNMI)) ||
(env->irq_line_state & CPU_INTERRUPT_VFIQ);
if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VFIQ) != 0)) {
@@ -900,6 +976,48 @@ void arm_cpu_update_vfiq(ARMCPU *cpu)
}
}
+void arm_cpu_update_vinmi(ARMCPU *cpu)
+{
+ /*
+ * Update the interrupt level for VINMI, which is the logical OR of
+ * the HCRX_EL2.VINMI bit and the input line level from the GIC.
+ */
+ CPUARMState *env = &cpu->env;
+ CPUState *cs = CPU(cpu);
+
+ bool new_state = ((arm_hcr_el2_eff(env) & HCR_VI) &&
+ (arm_hcrx_el2_eff(env) & HCRX_VINMI)) ||
+ (env->irq_line_state & CPU_INTERRUPT_VINMI);
+
+ if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VINMI) != 0)) {
+ if (new_state) {
+ cpu_interrupt(cs, CPU_INTERRUPT_VINMI);
+ } else {
+ cpu_reset_interrupt(cs, CPU_INTERRUPT_VINMI);
+ }
+ }
+}
+
+void arm_cpu_update_vfnmi(ARMCPU *cpu)
+{
+ /*
+ * Update the interrupt level for VFNMI, which is the HCRX_EL2.VFNMI bit.
+ */
+ CPUARMState *env = &cpu->env;
+ CPUState *cs = CPU(cpu);
+
+ bool new_state = (arm_hcr_el2_eff(env) & HCR_VF) &&
+ (arm_hcrx_el2_eff(env) & HCRX_VFNMI);
+
+ if (new_state != ((cs->interrupt_request & CPU_INTERRUPT_VFNMI) != 0)) {
+ if (new_state) {
+ cpu_interrupt(cs, CPU_INTERRUPT_VFNMI);
+ } else {
+ cpu_reset_interrupt(cs, CPU_INTERRUPT_VFNMI);
+ }
+ }
+}
+
void arm_cpu_update_vserr(ARMCPU *cpu)
{
/*
@@ -929,7 +1047,9 @@ static void arm_cpu_set_irq(void *opaque, int irq, int level)
[ARM_CPU_IRQ] = CPU_INTERRUPT_HARD,
[ARM_CPU_FIQ] = CPU_INTERRUPT_FIQ,
[ARM_CPU_VIRQ] = CPU_INTERRUPT_VIRQ,
- [ARM_CPU_VFIQ] = CPU_INTERRUPT_VFIQ
+ [ARM_CPU_VFIQ] = CPU_INTERRUPT_VFIQ,
+ [ARM_CPU_NMI] = CPU_INTERRUPT_NMI,
+ [ARM_CPU_VINMI] = CPU_INTERRUPT_VINMI,
};
if (!arm_feature(env, ARM_FEATURE_EL2) &&
@@ -955,8 +1075,12 @@ static void arm_cpu_set_irq(void *opaque, int irq, int level)
case ARM_CPU_VFIQ:
arm_cpu_update_vfiq(cpu);
break;
+ case ARM_CPU_VINMI:
+ arm_cpu_update_vinmi(cpu);
+ break;
case ARM_CPU_IRQ:
case ARM_CPU_FIQ:
+ case ARM_CPU_NMI:
if (level) {
cpu_interrupt(cs, mask[irq]);
} else {
@@ -1350,12 +1474,13 @@ static void arm_cpu_initfn(Object *obj)
#else
/* Our inbound IRQ and FIQ lines */
if (kvm_enabled()) {
- /* VIRQ and VFIQ are unused with KVM but we add them to maintain
- * the same interface as non-KVM CPUs.
+ /*
+ * VIRQ, VFIQ, NMI, VINMI are unused with KVM but we add
+ * them to maintain the same interface as non-KVM CPUs.
*/
- qdev_init_gpio_in(DEVICE(cpu), arm_cpu_kvm_set_irq, 4);
+ qdev_init_gpio_in(DEVICE(cpu), arm_cpu_kvm_set_irq, 6);
} else {
- qdev_init_gpio_in(DEVICE(cpu), arm_cpu_set_irq, 4);
+ qdev_init_gpio_in(DEVICE(cpu), arm_cpu_set_irq, 6);
}
qdev_init_gpio_out(DEVICE(cpu), cpu->gt_timer_outputs,
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index de740d223f..08a6bc50de 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -61,6 +61,9 @@
#define EXCP_DIVBYZERO 23 /* v7M DIVBYZERO UsageFault */
#define EXCP_VSERR 24
#define EXCP_GPC 25 /* v9 Granule Protection Check Fault */
+#define EXCP_NMI 26
+#define EXCP_VINMI 27
+#define EXCP_VFNMI 28
/* NB: add new EXCP_ defines to the array in arm_log_exception() too */
#define ARMV7M_EXCP_RESET 1
@@ -80,6 +83,9 @@
#define CPU_INTERRUPT_VIRQ CPU_INTERRUPT_TGT_EXT_2
#define CPU_INTERRUPT_VFIQ CPU_INTERRUPT_TGT_EXT_3
#define CPU_INTERRUPT_VSERR CPU_INTERRUPT_TGT_INT_0
+#define CPU_INTERRUPT_NMI CPU_INTERRUPT_TGT_EXT_4
+#define CPU_INTERRUPT_VINMI CPU_INTERRUPT_TGT_EXT_0
+#define CPU_INTERRUPT_VFNMI CPU_INTERRUPT_TGT_INT_1
/* The usual mapping for an AArch64 system register to its AArch32
* counterpart is for the 32 bit world to have access to the lower
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 5ed3eacbea..b82792f251 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -6042,15 +6042,19 @@ static void do_hcr_write(CPUARMState *env, uint64_t value, uint64_t valid_mask)
* and the state of the input lines from the GIC. (This requires
* that we have the BQL, which is done by marking the
* reginfo structs as ARM_CP_IO.)
- * Note that if a write to HCR pends a VIRQ or VFIQ it is never
- * possible for it to be taken immediately, because VIRQ and
- * VFIQ are masked unless running at EL0 or EL1, and HCR
- * can only be written at EL2.
+ * Note that if a write to HCR pends a VIRQ or VFIQ or VINMI or
+ * VFNMI, it is never possible for it to be taken immediately
+ * because VIRQ, VFIQ, VINMI and VFNMI are masked unless running
+ * at EL0 or EL1, and HCR can only be written at EL2.
*/
g_assert(bql_locked());
arm_cpu_update_virq(cpu);
arm_cpu_update_vfiq(cpu);
arm_cpu_update_vserr(cpu);
+ if (cpu_isar_feature(aa64_nmi, cpu)) {
+ arm_cpu_update_vinmi(cpu);
+ arm_cpu_update_vfnmi(cpu);
+ }
}
static void hcr_write(CPUARMState *env, const ARMCPRegInfo *ri, uint64_t value)
@@ -6198,6 +6202,23 @@ static void hcrx_write(CPUARMState *env, const ARMCPRegInfo *ri,
/* Clear RES0 bits. */
env->cp15.hcrx_el2 = value & valid_mask;
+
+ /*
+ * Updates to VINMI and VFNMI require us to update the status of
+ * virtual NMI, which are the logical OR of these bits
+ * and the state of the input lines from the GIC. (This requires
+ * that we have the BQL, which is done by marking the
+ * reginfo structs as ARM_CP_IO.)
+ * Note that if a write to HCRX pends a VINMI or VFNMI it is never
+ * possible for it to be taken immediately, because VINMI and
+ * VFNMI are masked unless running at EL0 or EL1, and HCRX
+ * can only be written at EL2.
+ */
+ if (cpu_isar_feature(aa64_nmi, cpu)) {
+ g_assert(bql_locked());
+ arm_cpu_update_vinmi(cpu);
+ arm_cpu_update_vfnmi(cpu);
+ }
}
static CPAccessResult access_hxen(CPUARMState *env, const ARMCPRegInfo *ri,
@@ -6213,6 +6234,7 @@ static CPAccessResult access_hxen(CPUARMState *env, const ARMCPRegInfo *ri,
static const ARMCPRegInfo hcrx_el2_reginfo = {
.name = "HCRX_EL2", .state = ARM_CP_STATE_AA64,
+ .type = ARM_CP_IO,
.opc0 = 3, .opc1 = 4, .crn = 1, .crm = 2, .opc2 = 2,
.access = PL2_RW, .writefn = hcrx_write, .accessfn = access_hxen,
.nv2_redirect_offset = 0xa0,
@@ -10795,6 +10817,9 @@ void arm_log_exception(CPUState *cs)
[EXCP_DIVBYZERO] = "v7M DIVBYZERO UsageFault",
[EXCP_VSERR] = "Virtual SERR",
[EXCP_GPC] = "Granule Protection Check",
+ [EXCP_NMI] = "NMI",
+ [EXCP_VINMI] = "Virtual IRQ NMI",
+ [EXCP_VFNMI] = "Virtual FIQ NMI",
};
if (idx >= 0 && idx < ARRAY_SIZE(excnames)) {
diff --git a/target/arm/internals.h b/target/arm/internals.h
index 516e0584bf..b53f5e8ff2 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -1109,6 +1109,24 @@ void arm_cpu_update_virq(ARMCPU *cpu);
*/
void arm_cpu_update_vfiq(ARMCPU *cpu);
+/**
+ * arm_cpu_update_vinmi: Update CPU_INTERRUPT_VINMI bit in cs->interrupt_request
+ *
+ * Update the CPU_INTERRUPT_VINMI bit in cs->interrupt_request, following
+ * a change to either the input VNMI line from the GIC or the HCRX_EL2.VINMI.
+ * Must be called with the BQL held.
+ */
+void arm_cpu_update_vinmi(ARMCPU *cpu);
+
+/**
+ * arm_cpu_update_vfnmi: Update CPU_INTERRUPT_VFNMI bit in cs->interrupt_request
+ *
+ * Update the CPU_INTERRUPT_VFNMI bit in cs->interrupt_request, following
+ * a change to the HCRX_EL2.VFNMI.
+ * Must be called with the BQL held.
+ */
+void arm_cpu_update_vfnmi(ARMCPU *cpu);
+
/**
* arm_cpu_update_vserr: Update CPU_INTERRUPT_VSERR bit
*
--
2.34.1