diff mbox series

[v3,1/3] nubus-device: round Declaration ROM memory region address to qemu_target_page_size()

Message ID 20240111102954.449462-2-mark.cave-ayland@ilande.co.uk
State New
Headers show
Series nubus: add nubus-virtio-mmio device | expand

Commit Message

Mark Cave-Ayland Jan. 11, 2024, 10:29 a.m. UTC 
Declaration ROM binary images can be any arbitrary size, however if a host ROM
memory region is not aligned to qemu_target_page_size() then we fail the
"assert(!(iotlb & ~TARGET_PAGE_MASK))" check in tlb_set_page_full().

Ensure that the host ROM memory region is aligned to qemu_target_page_size()
and adjust the offset at which the Declaration ROM image is loaded, since Nubus
ROM images are unusual in that they are aligned to the end of the slot address
space.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/nubus/nubus-device.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/hw/nubus/nubus-device.c b/hw/nubus/nubus-device.c
index 49008e4938..be4cb24696 100644
--- a/hw/nubus/nubus-device.c
+++ b/hw/nubus/nubus-device.c
@@ -10,6 +10,7 @@ 
 
 #include "qemu/osdep.h"
 #include "qemu/datadir.h"
+#include "exec/target_page.h"
 #include "hw/irq.h"
 #include "hw/loader.h"
 #include "hw/nubus/nubus.h"
@@ -30,7 +31,8 @@  static void nubus_device_realize(DeviceState *dev, Error **errp)
     NubusDevice *nd = NUBUS_DEVICE(dev);
     char *name, *path;
     hwaddr slot_offset;
-    int64_t size;
+    int64_t size, align_size;
+    uint8_t *rom_ptr;
     int ret;
 
     /* Super */
@@ -76,16 +78,24 @@  static void nubus_device_realize(DeviceState *dev, Error **errp)
         }
 
         name = g_strdup_printf("nubus-slot-%x-declaration-rom", nd->slot);
-        memory_region_init_rom(&nd->decl_rom, OBJECT(dev), name, size,
+
+        /*
+         * Ensure ROM memory region is aligned to target page size regardless
+         * of the size of the Declaration ROM image
+         */
+        align_size = ROUND_UP(size, qemu_target_page_size());
+        memory_region_init_rom(&nd->decl_rom, OBJECT(dev), name, align_size,
                                &error_abort);
-        ret = load_image_mr(path, &nd->decl_rom);
+        rom_ptr = memory_region_get_ram_ptr(&nd->decl_rom);
+        ret = load_image_size(path, rom_ptr + (uintptr_t)(align_size - size),
+                              size);
         g_free(path);
         g_free(name);
         if (ret < 0) {
             error_setg(errp, "could not load romfile \"%s\"", nd->romfile);
             return;
         }
-        memory_region_add_subregion(&nd->slot_mem, NUBUS_SLOT_SIZE - size,
+        memory_region_add_subregion(&nd->slot_mem, NUBUS_SLOT_SIZE - align_size,
                                     &nd->decl_rom);
     }
 }