vbox6: force C/H/S disk geometry from calculation

Some Ubuntu installations (e.g., 20.04) create installation disks with
strange C/H/S MBR partitions like 3988/255/2. Normally, VirtualBox reads
the MBR to guess disk geometry information for the virtual BIOS.
Unfortuantely, the strange values from Ubuntu lead to a heavy
virtual-disk activity on boot. Therefore, this commit forces the use of
calculated values based on the assumption that large disks use LBA
addressing anyway.

Fixes #4978

repos/ports/ports/virtualbox6.hash

@@ -1 +1 @@
-f5ebf8e03d4b29d3c186212bdc2d324bb31c5274
+d57e9deed61e070270fa153e610e3081f996ee24

repos/ports/src/virtualbox6/patches/disk_geometry.patch

@@ -0,0 +1,23 @@
+--- a/src/virtualbox6/src/VBox/Devices/PC/DevPcBios.cpp.orig
++++ b/src/virtualbox6/src/VBox/Devices/PC/DevPcBios.cpp
+@@ -604,6 +604,7 @@
+     RT_NOREF1(pBase);
+ 
+     PDMMEDIAGEOMETRY LCHSGeometry;
++#if 0 /* Genode */
+     int rc = pHardDisk->pfnBiosGetLCHSGeometry(pHardDisk, &LCHSGeometry);
+     if (   rc == VERR_PDM_GEOMETRY_NOT_SET
+         || LCHSGeometry.cCylinders == 0
+@@ -627,6 +628,12 @@
+             || LCHSGeometry.cSectors == 0
+             || LCHSGeometry.cSectors > 63)
+         {
++#else
++    /* always calculate geometry */
++    int rc = VINF_SUCCESS;
++    {
++        {
++#endif /* Genode */
+             uint64_t cSectors = pHardDisk->pfnGetSize(pHardDisk) / 512;
+             if (cSectors / 16 / 63 <= 1024)
+             {

repos/ports/src/virtualbox6/patches/series

@@ -12,3 +12,4 @@ audio.patch
 gcc-12.patch
 pgmphys.patch
 sup_ioctl_query_func_size.patch
+disk_geometry.patch