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m68k: virt: pass RNG seed via bootinfo block

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This commit wires up bootinfo's RNG seed attribute so that Linux VMs can
have their RNG seeded from the earliest possible time in boot, just like
the "rng-seed" device tree property on those platforms. The link
contains the corresponding Linux patch.

Link: https://lore.kernel.org/lkml/20220626111509.330159-1-Jason@zx2c4.com/
Based-on: <20220625152318.120849-1-Jason@zx2c4.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Message-Id: <20220626111804.330745-1-Jason@zx2c4.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Jason A. Donenfeld 2022-06-26 13:18:04 +02:00 committed by Laurent Vivier
parent 23f0a6c80d
commit a988465d0e
3 changed files with 24 additions and 0 deletions
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16
hw/m68k/bootinfo.h
View File

@ -56,4 +56,20 @@
stb_phys(as, base++, 0); \
base = (base + 1) & ~1; \
} while (0)
#define BOOTINFODATA(as, base, id, data, len) \
do { \
int i; \
stw_phys(as, base, id); \
base += 2; \
stw_phys(as, base, \
(sizeof(struct bi_record) + len + 3) & ~1); \
base += 2; \
stw_phys(as, base, len); \
base += 2; \
for (i = 0; i < len; ++i) { \
stb_phys(as, base++, data[i]); \
} \
base = (base + 1) & ~1; \
} while (0)
#endif

7
hw/m68k/virt.c
View File

@ -9,6 +9,7 @@
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/guest-random.h"
#include "sysemu/sysemu.h"
#include "cpu.h"
#include "hw/boards.h"
@ -120,6 +121,7 @@ static void virt_init(MachineState *machine)
hwaddr io_base;
int i;
ResetInfo *reset_info;
uint8_t rng_seed[32];
if (ram_size > 3399672 * KiB) {
/*
@ -245,6 +247,11 @@ 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));
/* load initrd */
if (initrd_filename) {
initrd_size = get_image_size(initrd_filename);

1
include/standard-headers/asm-m68k/bootinfo-virt.h
View File

@ -12,6 +12,7 @@
#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
#define VIRT_BOOTI_VERSION MK_BI_VERSION(2, 0)