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hw/nios2: virt: pass random seed to fdt 

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: Chris Wulff <crwulff@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Message-Id: <20220719120113.118034-1-Jason@zx2c4.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jason A. Donenfeld 2022-07-19 14:01:13 +02:00 committed by Paolo Bonzini
parent 7906f11e62
commit 6b23a67916
1 changed files with 5 additions and 0 deletions
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5
hw/nios2/boot.c
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@ -34,6 +34,7 @@
#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"
@ -83,6 +84,7 @@ static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize,
int fdt_size;
void *fdt = NULL;
int r;
uint8_t rng_seed[32];
if (dtb_filename) {
fdt = load_device_tree(dtb_filename, &fdt_size);
@ -91,6 +93,9 @@ static int nios2_load_dtb(struct nios2_boot_info bi, const uint32_t ramsize,
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);