Subject: [kvm-unit-tests PATCH v9 10/31] powerpc: Fix emulator illegal instruction test for powernv

From: Nicholas Piggin <[email-masked]>
Date: Sat, 4 May 2024 22:28:16 +1000

Illegal instructions cause 0xe40 (HEAI) interrupts rather
than program interrupts.

Acked-by: Thomas Huth <[email-masked]>
Signed-off-by: Nicholas Piggin <[email-masked]>
---
 lib/powerpc/asm/processor.h |  1 +
 lib/powerpc/setup.c         | 13 +++++++++++++
 powerpc/emulator.c          | 16 ++++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/lib/powerpc/asm/processor.h b/lib/powerpc/asm/processor.h
index 9d8061962..cf1b9d8ff 100644
--- a/lib/powerpc/asm/processor.h
+++ b/lib/powerpc/asm/processor.h
@@ -11,6 +11,7 @@ void do_handle_exception(struct pt_regs *regs);
 #endif /* __ASSEMBLY__ */
 
 extern bool cpu_has_hv;
+extern bool cpu_has_heai;
 
 static inline uint64_t mfspr(int nr)
 {
diff --git a/lib/powerpc/setup.c b/lib/powerpc/setup.c
index 89e5157f2..3c81aee9e 100644
--- a/lib/powerpc/setup.c
+++ b/lib/powerpc/setup.c
@@ -87,6 +87,7 @@ static void cpu_set(int fdtnode, u64 regval, void *info)
 }
 
 bool cpu_has_hv;
+bool cpu_has_heai;
 
 static void cpu_init(void)
 {
@@ -108,6 +109,18 @@ static void cpu_init(void)
 		hcall(H_SET_MODE, 0, 4, 0, 0);
 #endif
 	}
+
+	switch (mfspr(SPR_PVR) & PVR_VERSION_MASK) {
+	case PVR_VER_POWER10:
+	case PVR_VER_POWER9:
+	case PVR_VER_POWER8E:
+	case PVR_VER_POWER8NVL:
+	case PVR_VER_POWER8:
+		cpu_has_heai = true;
+		break;
+	default:
+		break;
+	}
 }
 
 static void mem_init(phys_addr_t freemem_start)
diff --git a/powerpc/emulator.c b/powerpc/emulator.c
index 39dd59645..af5174944 100644
--- a/powerpc/emulator.c
+++ b/powerpc/emulator.c
@@ -31,6 +31,20 @@ static void program_check_handler(struct pt_regs *regs, void *opaque)
 	regs->nip += 4;
 }
 
+static void heai_handler(struct pt_regs *regs, void *opaque)
+{
+	int *data = opaque;
+
+	if (verbose) {
+		printf("Detected invalid instruction %#018lx: %08x\n",
+		       regs->nip, *(uint32_t*)regs->nip);
+	}
+
+	*data = 8; /* Illegal instruction */
+
+	regs->nip += 4;
+}
+
 static void alignment_handler(struct pt_regs *regs, void *opaque)
 {
 	int *data = opaque;
@@ -363,6 +377,8 @@ int main(int argc, char **argv)
 	int i;
 
 	handle_exception(0x700, program_check_handler, (void *)&is_invalid);
+	if (cpu_has_heai)
+		handle_exception(0xe40, heai_handler, (void *)&is_invalid);
 	handle_exception(0x600, alignment_handler, (void *)&alignment);
 
 	for (i = 1; i < argc; i++) {
-- 
2.43.0