Re: [PATCH v9 00/21] Introduce ACPI for ARM64 based on ACPI 5.1

[Timur Tabi]

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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