xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2024-11-23 11:39:53 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

hw/riscv: virt: pass random seed to fdt

Browse Source 
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.

Cc: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Message-Id: <20220613115810.178210-1-Jason@zx2c4.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Jason A. Donenfeld 2022-06-13 13:58:10 +02:00 committed by Alistair Francis
parent 6d00ffad4e
commit e4b4f0b71c
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
hw/riscv/virt.c
View File

@ -21,6 +21,7 @@
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/error-report.h"
#include "qemu/guest-random.h"
#include "qapi/error.h"
#include "hw/boards.h"
#include "hw/loader.h"
@ -998,6 +999,7 @@ static void create_fdt(RISCVVirtState *s, const MemMapEntry *memmap,
MachineState *mc = MACHINE(s);
uint32_t phandle = 1, irq_mmio_phandle = 1, msi_pcie_phandle = 1;
uint32_t irq_pcie_phandle = 1, irq_virtio_phandle = 1;
uint8_t rng_seed[32];
if (mc->dtb) {
mc->fdt = load_device_tree(mc->dtb, &s->fdt_size);
@ -1046,6 +1048,10 @@ update_bootargs:
if (cmdline && *cmdline) {
qemu_fdt_setprop_string(mc->fdt, "/chosen", "bootargs", cmdline);
}
/* Pass seed to RNG */
qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
qemu_fdt_setprop(mc->fdt, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
}
static inline DeviceState *gpex_pcie_init(MemoryRegion *sys_mem,