[edk2-devel] [RFC PATCH] OvmfPkg/PlatformCI VS2019: Enable temporary workaround for cpuhp bugfix

[Yao, Jiewen]

Acked-by: Jiewen Yao <Jiewen.yao at Intel.com>

> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Michael
> Kubacki
> Sent: Friday, January 20, 2023 12:51 AM
> To: devel at edk2.groups.io; ardb at kernel.org
> Cc: Laszlo Ersek <lersek at redhat.com>; Gerd Hoffmann
> <kraxel at redhat.com>; Yao, Jiewen <jiewen.yao at intel.com>; Michael Brown
> <mcb30 at ipxe.org>; Oliver Steffen <osteffen at redhat.com>; Kubacki, Michael
> <michael.kubacki at microsoft.com>
> Subject: Re: [edk2-devel] [RFC PATCH] OvmfPkg/PlatformCI VS2019: Enable
> temporary workaround for cpuhp bugfix
> 
> Reviewed-by: Michael Kubacki <michael.kubacki at microsoft.com>
> 
> On 1/19/2023 8:43 AM, 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 <lersek at redhat.com>
> >
> > Cc: Gerd Hoffmann <kraxel at redhat.com>
> >
> > Cc: Jiewen Yao <jiewen.yao at intel.com>
> >
> > Cc: Michael Brown <mcb30 at ipxe.org>
> >
> > Cc: Oliver Steffen <osteffen at redhat.com>
> >
> > Cc: Michael Kubacki <michael.kubacki at microsoft.com>
> >
> >
> >
> > Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=4250
> >
> > Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
> >
> > ---
> >
> >   OvmfPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml |  2 +-
> >
> >   OvmfPkg/PlatformCI/PlatformBuildLib.py                | 12 ++++++++++++
> >
> >   2 files changed, 13 insertions(+), 1 deletion(-)
> >
> >
> >
> > diff --git a/OvmfPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml
> b/OvmfPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml
> >
> > index 7e63f419b26b..b3b91aa84ea0 100644
> >
> > --- a/OvmfPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml
> >
> > +++ b/OvmfPkg/PlatformCI/.azurepipelines/Windows-VS2019.yml
> >
> > @@ -24,7 +24,7 @@ jobs:
> >
> >         package: 'OvmfPkg'
> >
> >         vm_image: 'windows-2019'
> >
> >         should_run: true
> >
> > -      run_flags: "MAKE_STARTUP_NSH=TRUE QEMU_HEADLESS=TRUE"
> >
> > +      run_flags: "MAKE_STARTUP_NSH=TRUE QEMU_HEADLESS=TRUE
> QEMU_CPUHP_QUIRK=TRUE"
> >
> >
> >
> >       #Use matrix to speed up the build process
> >
> >       strategy:
> >
> > diff --git a/OvmfPkg/PlatformCI/PlatformBuildLib.py
> b/OvmfPkg/PlatformCI/PlatformBuildLib.py
> >
> > index bfef9849c749..58dc1189a2cc 100644
> >
> > --- a/OvmfPkg/PlatformCI/PlatformBuildLib.py
> >
> > +++ b/OvmfPkg/PlatformCI/PlatformBuildLib.py
> >
> > @@ -170,6 +170,7 @@ class PlatformBuilder( UefiBuilder,
> BuildSettingsManager):
> >
> >           self.env.SetValue("PRODUCT_NAME", "OVMF", "Platform Hardcoded")
> >
> >           self.env.SetValue("MAKE_STARTUP_NSH", "FALSE", "Default to false")
> >
> >           self.env.SetValue("QEMU_HEADLESS", "FALSE", "Default to false")
> >
> > +        self.env.SetValue("QEMU_CPUHP_QUIRK", "FALSE", "Default to false")
> >
> >           return 0
> >
> >
> >
> >       def PlatformPreBuild(self):
> >
> > @@ -211,6 +212,17 @@ class PlatformBuilder( UefiBuilder,
> BuildSettingsManager):
> >
> >               args += " -pflash " + os.path.join(OutputPath_FV, "OVMF.fd")    #
> path to firmware
> >
> >
> >
> >
> >
> > +        ###
> >
> > +        ### NOTE This is a temporary workaround to allow platform CI to
> cope with
> >
> > +        ###      a QEMU bug in the CPU hotplug code. Once the CI
> environment has
> >
> > +        ###      been updated to carry a fixed version of QEMU, this can be
> >
> > +        ###      removed again
> >
> > +        ###
> >
> > +        ### Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=4250
> >
> > +        ###
> >
> > +        if (self.env.GetValue("QEMU_CPUHP_QUIRK").upper() == "TRUE"):
> >
> > +            args += "  -fw_cfg name=opt/org.tianocore/X-Cpuhp-Bugcheck-
> Override,string=yes"
> >
> > +
> >
> >           if (self.env.GetValue("MAKE_STARTUP_NSH").upper() == "TRUE"):
> >
> >               f = open(os.path.join(VirtualDrive, "startup.nsh"), "w")
> >
> >               f.write("BOOT SUCCESS !!! \n")
> >
> 
> 
> 
> 



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