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hw/openrisc: virt: 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 is confirmed to successfully initialize the
RNG on Linux 5.19-rc2.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Jason A. Donenfeld 2022-06-22 13:45:13 +02:00 committed by Stafford Horne
parent 66564c31e4
commit c6fe3e6b4c
1 changed files with 6 additions and 0 deletions
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6
hw/openrisc/virt.c
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@ -8,6 +8,7 @@
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "qapi/error.h"
#include "cpu.h"
#include "exec/address-spaces.h"
@ -130,6 +131,7 @@ static void openrisc_create_fdt(OR1KVirtState *state,
void *fdt;
int cpu;
char *nodename;
uint8_t rng_seed[32];
fdt = state->fdt = create_device_tree(&state->fdt_size);
if (!fdt) {
@ -186,6 +188,10 @@ static void openrisc_create_fdt(OR1KVirtState *state,
qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);
}
/* Pass seed to RNG. */
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
/* Create aliases node for use by devices. */
qemu_fdt_add_subnode(fdt, "/aliases");
}