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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
	linux-efi <linux-efi@vger.kernel.org>,
	Hans de Goede <hdegoede@redhat.com>,
	the arch/x86 maintainers <x86@kernel.org>
Subject: Re: [PATCH v3 0/6] efi/x86: add support for generic EFI mixed mode boot
Date: Sun, 1 Mar 2020 15:00:35 -0500	[thread overview]
Message-ID: <20200301200035.GA2031375@rani.riverdale.lan> (raw)
In-Reply-To: <CAKv+Gu_N3vbea79CAQNZn6DmKBsKOhT9ucQYgBf0_8Pnd+vz2g@mail.gmail.com>

On Sun, Mar 01, 2020 at 08:36:42PM +0100, Ard Biesheuvel wrote:
> On Sun, 1 Mar 2020 at 18:22, Arvind Sankar <nivedita@alum.mit.edu> 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?

  reply	other threads:[~2020-03-01 20:00 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-22 15:55 [PATCH v3 0/6] efi/x86: add support for generic EFI mixed mode boot Ard Biesheuvel
2020-02-22 15:55 ` [PATCH v3 1/6] efi/x86: add headroom to decompressor BSS to account for setup block Ard Biesheuvel
2020-02-22 15:55 ` [PATCH v3 2/6] efi/x86: Drop redundant .bss section Ard Biesheuvel
2020-02-22 15:55 ` [PATCH v3 3/6] efi/libstub/x86: Make loaded_image protocol handling mixed mode safe Ard Biesheuvel
2020-02-22 15:55 ` [PATCH v3 4/6] efi/libstub/x86: Use Exit() boot service to exit the stub on errors Ard Biesheuvel
2020-02-22 15:55 ` [PATCH v3 5/6] efi/x86: Implement mixed mode boot without the handover protocol Ard Biesheuvel
2020-02-22 15:55 ` [PATCH v3 6/6] efi/x86: Add true mixed mode entry point into .compat section Ard Biesheuvel
2020-03-01 17:15 ` [PATCH v3 0/6] efi/x86: add support for generic EFI mixed mode boot Arvind Sankar
2020-03-01 17:22   ` Arvind Sankar
2020-03-01 19:36     ` Ard Biesheuvel
2020-03-01 20:00       ` Arvind Sankar [this message]
2020-03-01 20:02         ` Ard Biesheuvel
2020-03-01 20:20           ` Ard Biesheuvel
2020-03-01 20:41             ` Ard Biesheuvel
2020-03-01 20:54               ` Arvind Sankar
2020-03-01 21:36                 ` Ard Biesheuvel
2020-03-01 22:01                   ` Arvind Sankar
2020-03-01 22:56                     ` Ard Biesheuvel
2020-03-01 23:03                       ` Arvind Sankar
2020-03-02 12:14                         ` Ard Biesheuvel
2020-03-03  4:19                           ` Arvind Sankar

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