[RFC,v4,12/22] target/arm: Handle NMI in arm_cpu_do_interrupt_aarch64()

Commit Message

Jinjie Ruan Feb. 28, 2024, 9:29 a.m. UTC

According to Arm GIC section 4.6.3 Interrupt superpriority, the interrupt
with superpriority is always IRQ, never FIQ, so the NMI exception trap entry
behave like IRQ. However, VNMI can be IRQ or FIQ, FIQ can only come from
hcrx_el2.HCRX_VFNMI bit, IRQ can be raised from the GIC or come from the
hcrx_el2.HCRX_VINMI bit.

Signed-off-by: Jinjie Ruan <[e-mail]>
---
v4:
- Also handle VNMI in arm_cpu_do_interrupt_aarch64().
v3:
- Remove the FIQ NMI handle.
---
 target/arm/helper.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Patch

diff --git a/target/arm/helper.c b/target/arm/helper.c
index b796dbdf21..bd34b3506a 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -11459,12 +11459,21 @@  static void arm_cpu_do_interrupt_aarch64(CPUState *cs)
         break;
     case EXCP_IRQ:
     case EXCP_VIRQ:
+    case EXCP_NMI:
         addr += 0x80;
         break;
     case EXCP_FIQ:
     case EXCP_VFIQ:
         addr += 0x100;
         break;
+    case EXCP_VNMI:
+        if (env->irq_line_state & CPU_INTERRUPT_VNMI ||
+            env->cp15.hcrx_el2 & HCRX_VINMI) {
+            addr += 0x80;
+        } else if (env->cp15.hcrx_el2 & HCRX_VFNMI) {
+            addr += 0x100;
+        }
+        break;
     case EXCP_VSERR:
         addr += 0x180;
         /* Construct the SError syndrome from IDS and ISS fields. */