[RFC PATCH v9 08/23] target/arm: Handle IS/FS in ISR_EL1 for NMI, VINMI and VFNMI

[Jinjie Ruan]

Add IS and FS bit in ISR_EL1 and handle the read. With CPU_INTERRUPT_NMI or
CPU_INTERRUPT_VINMI, both CPSR_I and ISR_IS must be set. With
CPU_INTERRUPT_VFNMI, both CPSR_F and ISR_FS must be set.

Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
v9:
- CPU_INTERRUPT_VNMI -> CPU_INTERRUPT_VINMI.
- Handle CPSR_F and ISR_FS according to CPU_INTERRUPT_VFNMI instead of
  CPU_INTERRUPT_VFIQ and HCRX_EL2.VFNMI.
- Update the commit message.
v7:
- env->cp15.hcrx_el2 -> arm_hcrx_el2_eff().
- Add Reviewed-by.
v6:
- Verify that HCR_EL2.VF is set before checking VFNMI.
v4；
- Also handle VNMI.
v3:
- CPU_INTERRUPT_NMI do not set FIQ, so remove it.
- With CPU_INTERRUPT_NMI, both CPSR_I and ISR_IS must be set.
---
 target/arm/cpu.h    |  2 ++
 target/arm/helper.c | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 08a6bc50de..97997dbd08 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -1398,6 +1398,8 @@ void pmu_init(ARMCPU *cpu);
 #define CPSR_N (1U << 31)
 #define CPSR_NZCV (CPSR_N | CPSR_Z | CPSR_C | CPSR_V)
 #define CPSR_AIF (CPSR_A | CPSR_I | CPSR_F)
+#define ISR_FS (1U << 9)
+#define ISR_IS (1U << 10)
 
 #define CPSR_IT (CPSR_IT_0_1 | CPSR_IT_2_7)
 #define CACHED_CPSR_BITS (CPSR_T | CPSR_AIF | CPSR_GE | CPSR_IT | CPSR_Q \
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 077c9a6923..b57114d35d 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -2021,16 +2021,29 @@ static uint64_t isr_read(CPUARMState *env, const 
ARMCPRegInfo *ri)
         if (cs->interrupt_request & CPU_INTERRUPT_VIRQ) {
             ret |= CPSR_I;
         }
+        if (cs->interrupt_request & CPU_INTERRUPT_VINMI) {
+            ret |= ISR_IS;
+            ret |= CPSR_I;
+        }
     } else {
         if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
             ret |= CPSR_I;
         }
+
+        if (cs->interrupt_request & CPU_INTERRUPT_NMI) {
+            ret |= ISR_IS;
+            ret |= CPSR_I;
+        }
     }
 
     if (hcr_el2 & HCR_FMO) {
         if (cs->interrupt_request & CPU_INTERRUPT_VFIQ) {
             ret |= CPSR_F;
         }
+        if (cs->interrupt_request & CPU_INTERRUPT_VFNMI) {
+            ret |= ISR_FS;
+            ret |= CPSR_F;
+        }
     } else {
         if (cs->interrupt_request & CPU_INTERRUPT_FIQ) {
             ret |= CPSR_F;
-- 
2.34.1