On 02/27/2015 02:50 AM, Ard Biesheuvel wrote:
On 27 February 2015 at 03:20, Timur Tabi <timur@xxxxxxxxxxxxxx> wrote:
On 02/25/2015 02:39 AM, Hanjun Guo wrote:
Changes since v8:
I'm still debugging it, but v9 on the 4.0-rc1 kernel crashes after calling
the UEFI boot time services exit function. That is, this line:
status = sys_table->boottime->exit_boot_services(handle, mmap_key);
in allocate_new_fdt_and_exit_boot() gets called, and then soon after it
returns, the kernel crashes. It's really early because the UEFI exception
handler is called.
I did not have this problem with v8 patchset on 3.19.
Are you not seeing this on v4.0-rc1 without the patchset applied?
You're right -- I get the same crash even without the patchset applied.
Could the crash be inside the subsequent call to
SetVirtualAddressMap() instead of inside ExitBootServices()?
It looks that way. I'm going to have to debug that.
If so, you have a firmware bug: Mark Rutland spotted a similar bug in
the AMD Seattle firmware, which has been fixed in the mean time.
It has to do with the firmware dereferencing the virtual mapping as it
is being installed, which violates the UEFI spec.
Thanks.
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