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riscv: re-randomize rng-seed on reboot

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When the system reboots, the rng-seed that the FDT has should be
re-randomized, so that the new boot gets a new seed. Since the FDT is in
the ROM region at this point, we add a hook right after the ROM has been
added, so that we have a pointer to that copy of the FDT.

Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Alistair Francis <alistair.francis@wdc.com>
Cc: Bin Meng <bin.meng@windriver.com>
Cc: qemu-riscv@nongnu.org
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20221025004327.568476-6-Jason@zx2c4.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Jason A. Donenfeld 2022-10-25 02:43:21 +02:00 committed by Peter Maydell
parent 98aa4c839d
commit 64c75db3c5
1 changed files with 3 additions and 0 deletions
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3
hw/riscv/boot.c
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@ -30,6 +30,7 @@
#include "sysemu/device_tree.h" #include "sysemu/device_tree.h"
#include "sysemu/qtest.h" #include "sysemu/qtest.h"
#include "sysemu/kvm.h" #include "sysemu/kvm.h"
#include "sysemu/reset.h"
#include <libfdt.h> #include <libfdt.h>
@ -241,6 +242,8 @@ uint64_t riscv_load_fdt(hwaddr dram_base, uint64_t mem_size, void *fdt)
rom_add_blob_fixed_as("fdt", fdt, fdtsize, fdt_addr, rom_add_blob_fixed_as("fdt", fdt, fdtsize, fdt_addr,
&address_space_memory); &address_space_memory);
qemu_register_reset_nosnapshotload(qemu_fdt_randomize_seeds,
rom_ptr_for_as(&address_space_memory, fdt_addr, fdtsize));
return fdt_addr; return fdt_addr;
} }