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hw/rx: 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.

Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Message-Id: <20220719122033.135902-1-Jason@zx2c4.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jason A. Donenfeld 2022-07-19 14:20:33 +02:00 committed by Paolo Bonzini
parent 5e19cc68fb
commit c287941a4d
1 changed files with 4 additions and 0 deletions
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4
hw/rx/rx-gdbsim.c
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@ -19,6 +19,7 @@
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "qapi/error.h"
#include "hw/loader.h"
#include "hw/rx/rx62n.h"
@ -83,6 +84,7 @@ static void rx_gdbsim_init(MachineState *machine)
MemoryRegion *sysmem = get_system_memory();
const char *kernel_filename = machine->kernel_filename;
const char *dtb_filename = machine->dtb;
uint8_t rng_seed[32];
if (machine->ram_size < mc->default_ram_size) {
char *sz = size_to_str(mc->default_ram_size);
@ -140,6 +142,8 @@ static void rx_gdbsim_init(MachineState *machine)
error_report("Couldn't set /chosen/bootargs");
exit(1);
}
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
qemu_fdt_setprop(dtb, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
/* DTB is located at the end of SDRAM space. */
dtb_offset = ROUND_DOWN(machine->ram_size - dtb_size, 16);
rom_add_blob_fixed("dtb", dtb, dtb_size,