target/arm: ISR_EL1 bits track virtual interrupts if IMO/FMO set

The A/I/F bits in ISR_EL1 should track the virtual interrupt
status, not the physical interrupt status, if the associated
HCR_EL2.AMO/IMO/FMO bit is set. Implement this, rather than
always showing the physical interrupt status.

We don't currently implement anything to do with external
aborts, so this applies only to the I and F bits (though it
ought to be possible for the outer guest to present a virtual
external abort to the inner guest, even if QEMU doesn't
emulate physical external aborts, so there is missing
functionality in this area).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20181012144235.19646-6-peter.maydell@linaro.org

target/arm/helper.c

@@ -1329,12 +1329,26 @@ static uint64_t isr_read(CPUARMState *env, const ARMCPRegInfo *ri)
     CPUState *cs = ENV_GET_CPU(env);
     uint64_t ret = 0;
 
-    if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
-        ret |= CPSR_I;
+    if (arm_hcr_el2_imo(env)) {
+        if (cs->interrupt_request & CPU_INTERRUPT_VIRQ) {
+            ret |= CPSR_I;
+        }
+    } else {
+        if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
+            ret |= CPSR_I;
+        }
     }
-    if (cs->interrupt_request & CPU_INTERRUPT_FIQ) {
-        ret |= CPSR_F;
+
+    if (arm_hcr_el2_fmo(env)) {
+        if (cs->interrupt_request & CPU_INTERRUPT_VFIQ) {
+            ret |= CPSR_F;
+        }
+    } else {
+        if (cs->interrupt_request & CPU_INTERRUPT_FIQ) {
+            ret |= CPSR_F;
+        }
     }
+
     /* External aborts are not possible in QEMU so A bit is always clear */
     return ret;
 }