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authorJason A. Donenfeld <Jason@zx2c4.com>2022-06-22 13:45:13 +0200
committerStafford Horne <shorne@gmail.com>2022-09-04 07:02:57 +0100
commitc6fe3e6b4cd8d7b98ea37bf37fb3686ecd1304fe (patch)
treefea96c40212746ca105b320ee9eeb6675dc61f6c
parent66564c31e4e012c65c84d403c2dc14c0a754047f (diff)
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hw/openrisc: 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 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>
-rw-r--r--hw/openrisc/virt.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/hw/openrisc/virt.c b/hw/openrisc/virt.c
index 9a78234..f8a68a6 100644
--- a/hw/openrisc/virt.c
+++ b/hw/openrisc/virt.c
@@ -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");
}