[PATCH 1/2] OvmfPkg: start using the ECC plugin exception list

["Laszlo Ersek" <lersek@redhat.com>]

In the recent past, ECC has wreaked havoc at least twice:

- rejected Tom Lendacky's perfectly valid and clean code:

  https://bugzilla.tianocore.org/show_bug.cgi?id=3008#c5
  https://edk2.groups.io/g/devel/message/67097

- rejected James Bottomley's series for bogus reasons:

  https://bugzilla.tianocore.org/show_bug.cgi?id=3077#c4
  https://edk2.groups.io/g/devel/message/68302

There isn't capacity to improve ECC:

- Liming filed an ECC bug about the first case noted above, but it has
  received no feedback in 25 days (as of this writing):

  https://bugzilla.tianocore.org/show_bug.cgi?id=3060

And running CI or ECC on developer machines is difficult:

- I had to set up a separate VM for it,

- Shenglei gave Windows-based usage instructions only,

  https://edk2.groups.io/g/devel/message/61966

- experimenting with a CI outside of a VM is somewhat risky:

  https://github.com/tianocore/edk2-pytool-extensions/issues/231

ECC should be considered an experimental tool; I agreed to its enablement
in CI specifically because we were offered an exception list:

  https://edk2.groups.io/g/devel/message/60961
  https://www.redhat.com/archives/edk2-devel-archive/2020-June/msg00473.html

The github.com-based pull request process is already very inefficient for
both contributors and maintainers; it's time to put the ECC exception list
to use.

Now, I've tried adding those error codes that were reported against
James's series (after evaluating each entry in the report at
<https://dev.azure.com/tianocore/11ea4a10-ac9f-4e5f-8b13-7def1f19d478/_apis/build/builds/16071/logs/122>),
namely 4001, 4002, 5007, 8001, 8004, 8005. However, to my horror,
"EccCheck.ExceptionList" only supports the following format:

  "<ErrorID>", "<KeyWord>", "<ErrorID>", "<KeyWord>", ...

where each pair binds a particular error ID to a particular "offending"
identifier, such as C variable name. There is no wildcard support, so it's
impossible to disable entire classes of ECC reports.

Therefore, I have to use "EccCheck.IgnoreFiles". It also doesn't support
the "." subdirectory or the "*" wildcard. But, with some sweat, I can
still use it to disable ECC for all of OvmfPkg.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 OvmfPkg/OvmfPkg.ci.yaml | 49 ++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/OvmfPkg/OvmfPkg.ci.yaml b/OvmfPkg/OvmfPkg.ci.yaml
index 3128aefe9ed1..68d2de704d19 100644
--- a/OvmfPkg/OvmfPkg.ci.yaml
+++ b/OvmfPkg/OvmfPkg.ci.yaml
@@ -22,6 +22,55 @@
         ],
         ## Both file path and directory path are accepted.
         "IgnoreFiles": [
+            "8254TimerDxe",
+            "8259InterruptControllerDxe",
+            "AcpiPlatformDxe",
+            "AcpiTables",
+            "AmdSev",
+            "AmdSevDxe",
+            "Bhyve",
+            "CompatImageLoaderDxe",
+            "CpuHotplugSmm",
+            "CpuS3DataDxe",
+            "Csm",
+            "EmuVariableFvbRuntimeDxe",
+            "EnrollDefaultKeys",
+            "Include",
+            "IncompatiblePciDeviceSupportDxe",
+            "IoMmuDxe",
+            "Library",
+            "LinuxInitrdDynamicShellCommand",
+            "LsiScsiDxe",
+            "MptScsiDxe",
+            "OvmfXenElfHeaderGenerator.c",
+            "PciHotPlugInitDxe",
+            "PlatformDxe",
+            "PlatformPei",
+            "PvScsiDxe",
+            "QemuFlashFvbServicesRuntimeDxe",
+            "QemuKernelLoaderFsDxe",
+            "QemuRamfbDxe",
+            "QemuVideoDxe",
+            "SataControllerDxe",
+            "Sec",
+            "SioBusDxe",
+            "SmbiosPlatformDxe",
+            "SmmAccess",
+            "SmmControl2Dxe",
+            "Tcg",
+            "Virtio10Dxe",
+            "VirtioBlkDxe",
+            "VirtioGpuDxe",
+            "VirtioNetDxe",
+            "VirtioPciDeviceDxe",
+            "VirtioRngDxe",
+            "VirtioScsiDxe",
+            "XenBusDxe",
+            "XenIoPciDxe",
+            "XenIoPvhDxe",
+            "XenPlatformPei",
+            "XenPvBlkDxe",
+            "XenTimerDxe"
         ]
     },
     ## options defined .pytool/Plugin/CompilerPlugin
-- 
2.19.1.3.g30247aa5d201