[PATCH 2/2] hw/arm/virt: Warn when high memory region is disabled

[Gavin Shan]

When one specific high memory region is disabled due to the PA
limit, it'd better to warn user about that. The warning messages
help to identify the cause in some cases. For example, PCIe device
that has large MMIO bar, to be covered by PCIE_MMIO high memory
region, won't work properly if PCIE_MMIO high memory region is
disabled due to the PA limit.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 hw/arm/virt.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index bc0cd218f9..c91756e33d 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1691,6 +1691,7 @@ static uint64_t virt_cpu_mp_affinity(VirtMachineState 
*vms, int idx)
 static void virt_memmap_fits(VirtMachineState *vms, int index,
                              bool *enabled, hwaddr *base, int pa_bits)
 {
+    const char *region_name;
     hwaddr size = extended_memmap[index].size;
 
     /* The region will be disabled if its size isn't given */
@@ -1713,6 +1714,23 @@ static void virt_memmap_fits(VirtMachineState *vms, int 
index,
         vms->highest_gpa = *base + size - 1;
 
        *base = *base + size;
+    } else {
+        switch (index) {
+        case VIRT_HIGH_GIC_REDIST2:
+            region_name = "GIC_REDIST2";
+            break;
+        case VIRT_HIGH_PCIE_ECAM:
+            region_name = "PCIE_ECAM";
+            break;
+        case VIRT_HIGH_PCIE_MMIO:
+            region_name = "PCIE_MMIO";
+            break;
+        default:
+            region_name = "unknown";
+        }
+
+        warn_report("Disabled %s high memory region due to PA limit",
+                    region_name);
     }
 }
 
-- 
2.23.0