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hw/microblaze: pass random seed to fdt

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If the FDT contains /chosen/rng-seed, then the Linux RNG will use it to
initialize early. Set this using the usual guest random number
generation function. This FDT node is part of the DT specification.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
This commit is contained in:
Jason A. Donenfeld 2022-09-08 11:40:30 +02:00 committed by Edgar E. Iglesias
parent 2906f933dd
commit b91b6b5a2c
1 changed files with 5 additions and 0 deletions
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5
hw/microblaze/boot.c
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@ -30,6 +30,7 @@
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "sysemu/device_tree.h"
#include "sysemu/reset.h"
#include "hw/boards.h"
@ -75,6 +76,7 @@ static int microblaze_load_dtb(hwaddr addr,
int fdt_size;
void *fdt = NULL;
int r;
uint8_t rng_seed[32];
if (dtb_filename) {
fdt = load_device_tree(dtb_filename, &fdt_size);
@ -83,6 +85,9 @@ static int microblaze_load_dtb(hwaddr addr,
return 0;
}
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
if (kernel_cmdline) {
r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
kernel_cmdline);