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Subject[PATCH] m68k: virt: pass RNG seed via bootinfo block
Date
Other virt VMs can pass RNG seeds via the "rng-seed" device tree
property or via UEFI, but m68k doesn't have either. Instead it has its
own bootinfo protocol. So this commit adds support for receiving a RNG
seed from it, which will be used at the earliest possible time in boot,
just like device tree.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
arch/m68k/include/uapi/asm/bootinfo-virt.h | 1 +
arch/m68k/virt/config.c | 4 ++++
2 files changed, 5 insertions(+)

diff --git a/arch/m68k/include/uapi/asm/bootinfo-virt.h b/arch/m68k/include/uapi/asm/bootinfo-virt.h
index e4db7e2213ab..7c3044acdf4a 100644
--- a/arch/m68k/include/uapi/asm/bootinfo-virt.h
+++ b/arch/m68k/include/uapi/asm/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)

diff --git a/arch/m68k/virt/config.c b/arch/m68k/virt/config.c
index 632ba200ad42..ad71af8273ec 100644
--- a/arch/m68k/virt/config.c
+++ b/arch/m68k/virt/config.c
@@ -2,6 +2,7 @@

#include <linux/reboot.h>
#include <linux/serial_core.h>
+#include <linux/random.h>
#include <clocksource/timer-goldfish.h>

#include <asm/bootinfo.h>
@@ -92,6 +93,9 @@ int __init virt_parse_bootinfo(const struct bi_record *record)
data += 4;
virt_bi_data.virtio.irq = be32_to_cpup(data);
break;
+ case BI_VIRT_RNG_SEED:
+ add_bootloader_randomness(data + 4, be32_to_cpup(data));
+ break;
default:
unknown = 1;
break;
--
2.35.1
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