[PATCH v2 1/8] hw/arm/smmuv3-accel: Check ATS compatibility between host and guest

[Nathan Chen <nathanc@nvidia.com>]

From: Nathan Chen <nathanc@nvidia.com>

Compare the host SMMUv3 ATS support bit with the guest SMMUv3 ATS support
bit in IDR0 and fail the compatibility check if ATS support is opted as
enabled on the guest SMMUv3 when it is not supported on host SMMUv3.

Signed-off-by: Nathan Chen <nathanc@nvidia.com>
---
 hw/arm/smmuv3-accel.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/hw/arm/smmuv3-accel.c b/hw/arm/smmuv3-accel.c
index 17306cd04b..fe78ce69a5 100644
--- a/hw/arm/smmuv3-accel.c
+++ b/hw/arm/smmuv3-accel.c
@@ -101,6 +101,13 @@ smmuv3_accel_check_hw_compatible(SMMUv3State *s,
                    smmuv3_oas_bits(FIELD_EX32(s->idr[5], IDR5, OAS)));
         return false;
     }
+    /* Check ATS value opted is compatible with Host SMMUv3 */
+    if (FIELD_EX32(info->idr[0], IDR0, ATS) <
+                FIELD_EX32(s->idr[0], IDR0, ATS)) {
+        error_setg(errp, "Host SMMUv3 doesn't support Address Translation"
+                   " Services");
+        return false;
+    }
 
     /* QEMU SMMUv3 supports GRAN4K/GRAN16K/GRAN64K translation granules */
     if (FIELD_EX32(info->idr[5], IDR5, GRAN4K) !=
-- 
2.43.0