Booting Xen 4.9.0 on kernel-default 4.11.0-4, I currently see a non-fatal
WARNING
efi: Could not map UEFI random seed!
...
(XEN) Xen version 4.9.0_04-493 ([email protected]) (gcc (SUSE Linux) 4.8.5)
debug=y Wed May 10
21:26:38 UTC 2017
(XEN) Latest ChangeSet:
(XEN) Bootloader: EFI
(XEN) Command line: dom0_mem=4096M,max:4096M dom0_max_vcpus=1
dom0_vcpus_pin=true cpuidle=1 c
pufreq=xen vga=gfx-1920x1080x16 com1=115200,8n1,pci console=com1,vga
console_timestamps conso
le_to_ring conring_size=64 reboot=acpi sched=credit2 clocksource=hpet
iommu=verbose log_buf_l
en=16M sched_debug apic_verbosity=verbose loglvl=warning
guest_loglvl=none/warning
(XEN) Xen image load base address: 0x8c200000
...
[ 0.000000] console [xenboot0] enabled
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] efi: EFI v2.31 by American Megatrends
[ 0.000000] efi: ESRT=0x9ef8d998 ACPI 2.0=0x9e819000 ACPI=0x9e819000
SMBIOS=0xf04c0 M
PS=0xfd490
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: CPU: 0 PID: 0 at ../mm/early_ioremap.c:137
__early_ioremap+0xf4/0x1b9
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted
4.11.0-4.gcb15206-default #1
[ 0.000000] Call Trace:
[ 0.000000] dump_stack+0x5c/0x78
[ 0.000000] __warn+0xbe/0xe0
[ 0.000000] __early_ioremap+0xf4/0x1b9
[ 0.000000] efi_config_parse_tables+0x10d/0x1a7
[ 0.000000] ? __early_set_fixmap+0x8b/0x8e
[ 0.000000] ? efi_config_init+0x71/0x93
[ 0.000000] ? efi_config_init+0x71/0x93
[ 0.000000] ? efi_init+0x35f/0x45d
[ 0.000000] ? 0xffffffff81000000
[ 0.000000] ? setup_arch+0x471/0xcea
[ 0.000000] ? printk+0x43/0x4b
[ 0.000000] ? start_kernel+0x9d/0x43e
[ 0.000000] ? xen_start_kernel+0x4de/0x4e8
[ 0.000000] ---[ end trace c06508679cc2dcf2 ]---
[ 0.000000] efi: Could not map UEFI random seed!
[ 0.000000] efi: memattr: Unexpected EFI Memory Attributes table version
-268402688
[ 0.000000] SMBIOS 2.7 present.
[ 0.000000] DMI: Supermicro X10SAT/X10SAT, BIOS 3.0 05/26/2015
[ 0.000000] Hypervisor detected: Xen
...
The notice is relatively new; tho can't tell you specifically when it appeared.
The system *does* boot successfully, and *appears* to be functioning.
Digging, I found
Patchwork [1/2] efi: add support for seeding the RNG from a UEFI config table
https://patchwork.kernel.org/patch/9364581/
Is this WARNING, in fact, related to that patch?
Is the 'fix' for the warning the inclusion of that patch? Or, is there a
kernel boot option needed?
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