diff options
| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-06-26 13:18:04 +0200 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2022-07-06 12:30:41 +0200 |
| commit | a988465d0eb7e2ee31a3679bbe3fbe71681820da (patch) | |
| tree | c8bd43d7565293669d195147ee87e11cab488a6c | |
| parent | 23f0a6c80d9dc05508a9c63e29e9ded905186099 (diff) | |
m68k: virt: pass RNG seed via bootinfo block
This commit wires up bootinfo's RNG seed attribute so that Linux VMs can
have their RNG seeded from the earliest possible time in boot, just like
the "rng-seed" device tree property on those platforms. The link
contains the corresponding Linux patch.
Link: https://lore.kernel.org/lkml/20220626111509.330159-1-Jason@zx2c4.com/
Based-on: <20220625152318.120849-1-Jason@zx2c4.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Message-Id: <20220626111804.330745-1-Jason@zx2c4.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
| -rw-r--r-- | hw/m68k/bootinfo.h | 16 | ||||
| -rw-r--r-- | hw/m68k/virt.c | 7 | ||||
| -rw-r--r-- | include/standard-headers/asm-m68k/bootinfo-virt.h | 1 |
3 files changed, 24 insertions, 0 deletions
diff --git a/hw/m68k/bootinfo.h b/hw/m68k/bootinfo.h index ff4e155a3c..bd8b212fd3 100644 --- a/hw/m68k/bootinfo.h +++ b/hw/m68k/bootinfo.h @@ -56,4 +56,20 @@ stb_phys(as, base++, 0); \ base = (base + 1) & ~1; \ } while (0) + +#define BOOTINFODATA(as, base, id, data, len) \ + do { \ + int i; \ + stw_phys(as, base, id); \ + base += 2; \ + stw_phys(as, base, \ + (sizeof(struct bi_record) + len + 3) & ~1); \ + base += 2; \ + stw_phys(as, base, len); \ + base += 2; \ + for (i = 0; i < len; ++i) { \ + stb_phys(as, base++, data[i]); \ + } \ + base = (base + 1) & ~1; \ + } while (0) #endif diff --git a/hw/m68k/virt.c b/hw/m68k/virt.c index e215aa3d42..0aa383fa6b 100644 --- a/hw/m68k/virt.c +++ b/hw/m68k/virt.c @@ -9,6 +9,7 @@ #include "qemu/osdep.h" #include "qemu/units.h" +#include "qemu/guest-random.h" #include "sysemu/sysemu.h" #include "cpu.h" #include "hw/boards.h" @@ -120,6 +121,7 @@ static void virt_init(MachineState *machine) hwaddr io_base; int i; ResetInfo *reset_info; + uint8_t rng_seed[32]; if (ram_size > 3399672 * KiB) { /* @@ -245,6 +247,11 @@ static void virt_init(MachineState *machine) kernel_cmdline); } + /* Pass seed to RNG. */ + qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed)); + BOOTINFODATA(cs->as, parameters_base, BI_VIRT_RNG_SEED, + rng_seed, sizeof(rng_seed)); + /* load initrd */ if (initrd_filename) { initrd_size = get_image_size(initrd_filename); diff --git a/include/standard-headers/asm-m68k/bootinfo-virt.h b/include/standard-headers/asm-m68k/bootinfo-virt.h index 81be1e0924..1b1ffd4705 100644 --- a/include/standard-headers/asm-m68k/bootinfo-virt.h +++ b/include/standard-headers/asm-m68k/bootinfo-virt.h @@ -12,6 +12,7 @@ #define BI_VIRT_GF_TTY_BASE 0x8003 #define BI_VIRT_VIRTIO_BASE 0x8004 #define BI_VIRT_CTRL_BASE 0x8005 +#define BI_VIRT_RNG_SEED 0x8006 #define VIRT_BOOTI_VERSION MK_BI_VERSION(2, 0) |