Re: [PATCH v3 0/6] efi/x86: add support for generic EFI mixed mode boot

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On Sun, Mar 01, 2020 at 08:36:42PM +0100, Ard Biesheuvel wrote:
> On Sun, 1 Mar 2020 at 18:22, Arvind Sankar <nivedita@xxxxxxxxxxxx> wrote:
> >
> > On Sun, Mar 01, 2020 at 12:15:10PM -0500, Arvind Sankar wrote:
> > > What I'm doing is creating an x86-64 defconfig based on tip:efi/core,
> > > and then running it via
> > >
> > > $ qemu-system-x86_64 -cpu Haswell -pflash qemu/OVMF_64.fd \
> >                                                  ^^^^^^^
> > That OVMF_64.fd is incorrect copy/paste from a different run, the panic
> > case is using OVMF-mixed-mode-compat-section.fd.
> > >   -drive file=fat:rw:qemu/boot -nographic -m 3072
> 
> Thanks for the patch. Interestingly, I don't even make it to the point
> where it crashes, and I end up in an ASSERT() in the firmware:
> 
> ASSERT_EFI_ERROR (Status = Not Found)
> ASSERT /home/ardbie01/build/edk2/MdeModulePkg/Universal/ReportStatusCodeRouter/RuntimeDxe/ReportStatusCodeRouterRuntimeDxe.c(347):
> !EFI_ERROR (Status)
> 
> which appears to be a result of the fact that the memory map passed to
> SetVirtualAddressMap() does not cover some function pointer that gets
> converted in that code.
> 
> I don't remember - does mixed mode even work in general with 3 GB of memory?

Oh -- is there some option to enable debugging assertions? I did see
that it crashed somewhere inside SetVirtualMap (i.e. we called it and
it never returned).

For some reason, with nokaslr on the command line, I can't get this to
crash. All the addresses seem to be within 4Gb, so it ought to work, no?



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