On Thu, Jan 19, 2023 at 02:43:02PM +0100, Ard Biesheuvel wrote: > QEMU for x86 has a nasty CPU hotplug bug of which the ramifications are > difficult to oversee, even though KVM acceleration seems to be > unaffected. This has been addressed in QEMU mainline, and will percolate > through the ecosystem at its usual pace. In the mean time, due to the > potential impact on production workloads, we will be updating OVMF to > abort the boot when it detects a QEMU build that is affected. > > Tiancore's platform CI uses QEMU in TCG mode, and is therefore impacted > by this mitigation, unless its QEMU builds are updated. This has been > done for Ubuntu-GCC5, but Windows-VS2019 still uses a QEMU build that is > affected. > > Aborting the boot upon detecting the QEMU issue will render all boot > tests carried out on Windows-VS2019 broken unless we implement the > 'escape hatch' that enables proceed-at-your-own-risk mode, and permits > the boot to proceed even if the QEMU issue is detected. > > So let's enable this for Windows-VS2019, and remove it again once it is > no longer needed. > > Cc: Laszlo Ersek <ler...@redhat.com> > Cc: Gerd Hoffmann <kra...@redhat.com> > Cc: Jiewen Yao <jiewen....@intel.com> > Cc: Michael Brown <mc...@ipxe.org> > Cc: Oliver Steffen <ostef...@redhat.com> > Cc: Michael Kubacki <michael.kuba...@microsoft.com> > > Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=4250 > Signed-off-by: Ard Biesheuvel <a...@kernel.org>
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