m68k: rework BI_VIRT_RNG_SEED as BI_RNG_SEED

Following a change on the kernel side (see link), pass BI_RNG_SEED
instead of BI_VIRT_RNG_SEED. This should have no impact on
compatibility, as there will simply be no effect if it's an old kernel,
which is how things have always been. We then use this as an opportunity
to add this to q800, since now we can, which is a nice improvement.

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Laurent Vivier <laurent@vivier.eu>
Link: https://lore.kernel.org/lkml/20220923170340.4099226-3-Jason@zx2c4.com/
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Message-Id: <20220926113900.1256630-1-Jason@zx2c4.com>
[lv: s/^I/         /g]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

1 files changed, 7 insertions, 0 deletions

diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c
index 101ab0f803..a4590c2cb0 100644
--- a/hw/m68k/q800.c
+++ b/hw/m68k/q800.c
@@ -23,6 +23,7 @@
 #include "qemu/osdep.h"
 #include "qemu/units.h"
 #include "qemu/datadir.h"
+#include "qemu/guest-random.h"
 #include "sysemu/sysemu.h"
 #include "cpu.h"
 #include "hw/boards.h"
@@ -385,6 +386,7 @@ static void q800_init(MachineState *machine)
     NubusBus *nubus;
     DeviceState *glue;
     DriveInfo *dinfo;
+    uint8_t rng_seed[32];
 
     linux_boot = (kernel_filename != NULL);
 
@@ -634,6 +636,11 @@ static void q800_init(MachineState *machine)
                         kernel_cmdline);
         }
 
+        /* Pass seed to RNG. */
+        qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
+        BOOTINFODATA(cs->as, parameters_base, BI_RNG_SEED,
+                     rng_seed, sizeof(rng_seed));
+
         /* load initrd */
         if (initrd_filename) {
             initrd_size = get_image_size(initrd_filename);