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hw/mips: boston: 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.

I'd do the same for other MIPS platforms but boston is the only one that
seems to use FDT.

Cc: Paul Burton <paulburton@kernel.org>
Cc: Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>
Cc: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Message-Id: <20220719120843.134392-1-Jason@zx2c4.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jason A. Donenfeld 2022-07-19 14:08:43 +02:00 committed by Paolo Bonzini
parent 6b23a67916
commit 5e19cc68fb
1 changed files with 5 additions and 0 deletions
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5
hw/mips/boston.c
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@ -34,6 +34,7 @@
#include "hw/qdev-properties.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "qemu/log.h"
#include "chardev/char.h"
#include "sysemu/device_tree.h"
@ -363,6 +364,7 @@ static const void *boston_fdt_filter(void *opaque, const void *fdt_orig,
size_t ram_low_sz, ram_high_sz;
size_t fdt_sz = fdt_totalsize(fdt_orig) * 2;
g_autofree void *fdt = g_malloc0(fdt_sz);
uint8_t rng_seed[32];
err = fdt_open_into(fdt_orig, fdt, fdt_sz);
if (err) {
@ -370,6 +372,9 @@ static const void *boston_fdt_filter(void *opaque, const void *fdt_orig,
return NULL;
}
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
qemu_fdt_setprop(fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
cmdline = (machine->kernel_cmdline && machine->kernel_cmdline[0])
? machine->kernel_cmdline : " ";
err = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);