On Fri, Jan 31, 2014 at 03:23:18PM +0100, Borislav Petkov wrote: > And now my question: > > How can I reliably find out which region contains that > uv_systab.function call? > > I need it so that I can map it in the EFI page table and you can > continue to call that function and you can get back to your reliable way > to boot. While working on an answer to this question, I ran across another issue on some newer hardware, that looks like it's definitely related to this problem, and might be the root cause. When booting on a UV2 we die in efi_enter_virtual_mode: BUG: unable to handle kernel paging request at 0000008f7e848020 IP: [<000000007dadb6a9>] 0x7dadb6a8 PGD 0 Oops: 0000 [#1] SMP Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.11.0-medusa-00038-gd2f7cbe #821 Hardware name: SGI UV2000/ROMLEY, BIOS SGI UV 2000/3000 series BIOS 01/15/2013 task: ffffffff817ae400 ti: ffffffff8179e000 task.ti: ffffffff8179e000 RIP: 0010:[<000000007dadb6a9>] [<000000007dadb6a9>] 0x7dadb6a8 RSP: 0000:ffffffff8179fd90 EFLAGS: 00010202 RAX: 000000007d9b8e01 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000007db074f8 RSI: 000000007d9b8e18 RDI: 0000008f7e848000 RBP: 000000007db074f8 R08: 0000000000000001 R09: 0000008f7e848000 R10: 0000000000000030 R11: ffff880ffffda000 R12: 8000000000000000 R13: 000077ff80000000 R14: ffff888f7e848000 R15: 000000000009b000 FS: 0000000000000000(0000) GS:ffff880fffc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000008f7e848020 CR3: 000000000009b000 CR4: 00000000000406b0 Stack: fffffffef6000000 0000000000000000 0000000000000000 80000000000001e3 0000000000000030 000000007dadd540 0000000000001f20 0000000060000202 000000007d9b8da0 000000007daf8c6b ffffffff810fd2bc 00000000000000d0 Call Trace: [<ffffffff810fd2bc>] ? cache_grow+0x1e5/0x236 [<ffffffff8103adac>] ? efi_call4+0x6c/0xf0 [<ffffffff8186452f>] ? efi_enter_virtual_mode+0x1ac/0x328 [<ffffffff8184de98>] ? start_kernel+0x35b/0x3ed [<ffffffff8184d950>] ? repair_env_string+0x60/0x60 [<ffffffff8184d479>] ? x86_64_start_reservations+0x2e/0x30 [<ffffffff8184d5a3>] ? x86_64_start_kernel+0x128/0x12f Code: Bad RIP value. RIP [<000000007dadb6a9>] 0x7dadb6a8 RSP <ffffffff8179fd90> CR2: 0000008f7e848020 Let me know what other information you need and I'll get it to you ASAP. Thanks! - Alex -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
