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SubjectEFI tree kernel panic in phys_efi_set_virtual_address_map()
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Hi Boris,

An EFI tree kernel panic'd during boot on one of my systems. It boots
fine when efi=old_map option is specified. So, I think it is caused by
your EFI virtual mapping changes.

The panic message is as follows. I added some printk's to log the
arguments of phys_efi_set_virtual_address_map(). The fault address is
__pa(new_memmap) + 0x20 (too high for the map?).

Thanks,
-Toshi



efi: >> Call phys_efi_set_virtual_address_map()
efi: count 29
efi: desc_size 0x30
efi: new_memmap 0xffff8a03fec16800
efi: __pa(new_memmap) 0x203fec16800

BUG: unable to handle kernel paging request at 00000203fec16820
IP: [<0000000072dcda76>] 0x72dcda75
PGD 0
Oops: 0000 [#1] SMP
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.12.0+ #52
Hardware name: HP CB920s x1, BIOS Bundle: 005.028.018 SFW: 012.124.000
10/28/2013
task: ffffffff81a10480 ti: ffffffff81a00000 task.ti: ffffffff81a00000
RIP: 0010:[<0000000072dcda76>] [<0000000072dcda76>] 0x72dcda75
RSP: 0000:ffffffff81a01e08 EFLAGS: 00010206
RAX: 00000000725fee18 RBX: 00000000725feda0 RCX: 00000203fec16800
RDX: 0000000072dfe070 RSI: 0000000060000202 RDI: 0000000072dcdac8
RBP: 0000000072dd0560 R08: 0000000000000000 R09: 000000000000001d
R10: 0000000000000030 R11: 8000000000000000 R12: ffff8a03fec16800
R13: 0000000000000001 R14: 000000000000001d R15: 000000000009c000
FS: 0000000000000000(0000) GS:ffff88087fa00000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000203fec16820 CR3: 000000000009c000 CR4: 00000000000406b0
Stack:
0000000072dfb88f 0000000000000001 0000000000000d08 0000000000000000
ffffffff81d79a98 0000000072dcdac8 0000000072dcdb93 0000000000000001
ffffffff81a01f80 0000000000000570 0000000000000000 0000000000000000
Call Trace:
[<ffffffff81045cec>] ? efi_call4+0x6c/0xf0
[<ffffffff81b02f65>] ? efi_enter_virtual_mode+0x229/0x3f1
[<ffffffff81aebdf2>] ? start_kernel+0x36c/0x407
[<ffffffff81aeb88f>] ? repair_env_string+0x5c/0x5c
[<ffffffff81aeb5a3>] ? x86_64_start_reservations+0x2a/0x2c
[<ffffffff81aeb696>] ? x86_64_start_kernel+0xf1/0xf4
Code: Bad RIP value.
RIP [<0000000072dcda76>] 0x72dcda75
RSP <ffffffff81a01e08>
CR2: 00000203fec16820
---[ end trace e50b25032c120443 ]---




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