On Wed, 29 May 2019 at 17:12, Laszlo Ersek <lersek@redhat.com> wrote:
>
> Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=1859
> Repo: https://github.com/lersek/edk2.git
> Branch: exbar_mtrr_bz_1859
>
> The fix (commit range 3b7a897cd8e3..39b9a5ffe661) for
> <https://bugzilla.tianocore.org/show_bug.cgi?id=1814> is technically
> correct, but it tickles an (arguably unjustified) assumption in QEMU the
> wrong way. For end users, this makes the original fix for TianoCore#1814
> a regression, under certain circumstances.
>
> In theory, the assumption should be eliminated in QEMU, but in practice,
> that could be quite intrusive and/or take long. It seems possible to
> work around the problem in OVMF, satisfying the assumption again; for
> that, OVMF needs a different fix (and a different trade-off) for the
> original problem described in TianoCore#1814.
>
> Please see the detailed problem statement and the workaround's idea in
> TianoCore#1859.
>
> If possible, I'd like to get this into edk2-stable201905 (which we're
> postponing by two weeks anyway, for the sake of the OpenSSL 1.1.1b
> upgrade).
>
> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Jordan Justen <jordan.l.justen@intel.com>
>
For the series,
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
I think the reverts obviously belong in the stable tag, and I don't
see why we shouldn't include the other two patches as well.
> Laszlo Ersek (6):
> Revert "OvmfPkg/PlatformPei: fix MTRR for low-RAM sizes that have many
> bits clear"
> Revert "OvmfPkg/PlatformPei: reorder the 32-bit PCI window vs. the
> PCIEXBAR on q35"
> Revert "OvmfPkg/PlatformPei: hoist PciBase assignment above the
> i440fx/q35 branching"
> Revert "OvmfPkg/PlatformPei: assign PciSize on both i440fx/q35
> branches explicitly"
> OvmfPkg: raise the PCIEXBAR base to 2816 MB on Q35
> OvmfPkg/PlatformPei: set 32-bit UC area at PciBase / PciExBarBase
> (pc/q35)
>
> OvmfPkg/OvmfPkgIa32.dsc | 5 +-
> OvmfPkg/OvmfPkgIa32X64.dsc | 5 +-
> OvmfPkg/OvmfPkgX64.dsc | 5 +-
> OvmfPkg/PlatformPei/Platform.h | 5 ++
> OvmfPkg/PlatformPei/MemDetect.c | 70 +++++++++++++++-----
> OvmfPkg/PlatformPei/Platform.c | 17 +++--
> 6 files changed, 80 insertions(+), 27 deletions(-)
>
> --
> 2.19.1.3.g30247aa5d201
>
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