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OvmfPkg: add PcdEntryPointOverrideDefaultValue 

UefiDriverEntryPointFwCfgOverrideLib will use
PcdEntryPointOverrideDefaultValue to decide what to do in case the
fw_cfg file specified via PcdEntryPointOverrideFwCfgVarName is not
present.  Default is "yes".

This allows to disable drivers by default and only enable them when
requested via fw_cfg.

Also log a message with the config option applied and whenever the
default value or a fw_cfg option was used.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2024-11-08 10:24:03 +01:00 committed by mergify[bot]
parent 9ca29831f6
commit 645988d9b3
3 changed files with 19 additions and 1 deletions
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15
OvmfPkg/Library/UefiDriverEntryPointFwCfgOverrideLib/UefiDriverEntryPointFwCfgOverrideLib.c
View File

@ -120,7 +120,20 @@ _ModuleEntryPoint (
FixedPcdGetPtr (PcdEntryPointOverrideFwCfgVarName),
&Enabled
);
if (!RETURN_ERROR (RetStatus) && !Enabled) {
if (RETURN_ERROR (RetStatus)) {
Enabled = AsciiStrCmp (FixedPcdGetPtr (PcdEntryPointOverrideDefaultValue), "yes") == 0;
}
DEBUG ((
DEBUG_INFO,
"EntryPointFwCfgOverride: %a = %a (%a)\n",
FixedPcdGetPtr (PcdEntryPointOverrideFwCfgVarName),
Enabled ? "enabled" : "disabled",
RETURN_ERROR (RetStatus) ? "default" : "fw_cfg"
));
if (!Enabled) {
//
// The QEMU fw_cfg variable tells us not to load this image. So abort.
//

1
OvmfPkg/Library/UefiDriverEntryPointFwCfgOverrideLib/UefiDriverEntryPointFwCfgOverrideLib.inf
View File

@ -37,6 +37,7 @@
[FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideFwCfgVarName
gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideDefaultValue
#
# For UEFI drivers, these architectural protocols defined in PI 1.0 spec need

4
OvmfPkg/OvmfPkg.dec
View File

@ -346,6 +346,10 @@
# check to decide whether to abort dispatch of the driver it is linked into.
gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideFwCfgVarName|""|VOID*|0x68
## The default value UefiDriverEntryPointFwCfgOverrideLib will use in case
# the QEMU fw_cfg variable is not present
gUefiOvmfPkgTokenSpaceGuid.PcdEntryPointOverrideDefaultValue|"yes"|VOID*|0x76
## Restrict boot to EFI applications in firmware volumes.
gUefiOvmfPkgTokenSpaceGuid.PcdBootRestrictToFirmware|FALSE|BOOLEAN|0x6c