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m68k: rework BI_VIRT_RNG_SEED as BI_RNG_SEED

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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>
This commit is contained in:
Jason A. Donenfeld 2022-09-26 13:38:59 +02:00 committed by Laurent Vivier
parent 0529245488
commit 693869a66e
4 changed files with 21 additions and 6 deletions
hw/m68k
q800.cvirt.c
include/standard-headers/asm-m68k
bootinfo-virt.hbootinfo.h

7
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);

8
hw/m68k/virt.c

@ -248,10 +248,10 @@ static void virt_init(MachineState *machine)
kernel_cmdline);
}
/* Pass seed to RNG. */
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
BOOTINFODATA(cs->as, parameters_base, BI_VIRT_RNG_SEED,
rng_seed, sizeof(rng_seed));
/* 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) {

4
include/standard-headers/asm-m68k/bootinfo-virt.h

@ -12,7 +12,9 @@
#define BI_VIRT_GF_TTY_BASE 0x8003
#define BI_VIRT_VIRTIO_BASE 0x8004
#define BI_VIRT_CTRL_BASE 0x8005
#define BI_VIRT_RNG_SEED 0x8006
/* No longer used -- replaced with BI_RNG_SEED -- but don't reuse this index:
* #define BI_VIRT_RNG_SEED 0x8006 */
#define VIRT_BOOTI_VERSION MK_BI_VERSION(2, 0)

8
include/standard-headers/asm-m68k/bootinfo.h

@ -57,7 +57,13 @@ struct mem_info {
/* (struct mem_info) */
#define BI_COMMAND_LINE 0x0007 /* kernel command line parameters */
/* (string) */
/*
* A random seed used to initialize the RNG. Record format:
*
* - length [ 2 bytes, 16-bit big endian ]
* - seed data [ `length` bytes, padded to preserve 4-byte struct alignment ]
*/
#define BI_RNG_SEED 0x0008
/*
* Linux/m68k Architectures (BI_MACHTYPE)