OvmfPkg: Use the OvmfPkg version of CcProbeLib #10597
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Currently, multiple dsc files within the OvmfPkg directory use the NULL
version of the CcProbeLib library. However, these packages have support
for confidential guests (usage of CcExitLib, MemEncrypt{Sev,Tdx}Lib, etc.)
and should be using the OvmfPkg version of the CcProbeLib.
The use of the NULL library causes the PCI option ROM to be enabled, which
can't be trusted as it originates from the hypervisor. The use of the NULL
library also causes a KVM hypervisor error when attempting to map/back the
option ROM region when running an SEV-SNP guest.
Update the various dsc files to reference the OvmfPkg version of the
CcProbeLib library and prevent usage of PCI option ROMs.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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ardbiesheuvel,
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weltling
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I can test microvm tomorrow. Not sure about cloudhw, I'd suggest to check the commit log. |
Ok, I was able to boot an image using Cloud Hypervisor. |
fitzthum
approved these changes
Jan 9, 2025
jyao1
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Jan 10, 2025
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microvm is broken in master, looking ... |
kraxel
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Jan 10, 2025
ardbiesheuvel
approved these changes
Jan 13, 2025
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Description
Currently, multiple dsc files within the OvmfPkg directory use the NULL version of the CcProbeLib library. However, these packages have support for confidential guests (usage of CcExitLib, MemEncrypt{Sev,Tdx}Lib, etc.) and should be using the OvmfPkg version of the CcProbeLib.
The use of the NULL library causes the PCI option ROM to be enabled, which can't be trusted as it originates from the hypervisor. The use of the NULL library also causes a KVM hypervisor error when attempting to map/back the option ROM region when running an SEV-SNP guest.
Update the various dsc files to reference the OvmfPkg version of the CcProbeLib library and prevent usage of PCI option ROMs.
How This Was Tested
This was tested by launching SEV, SEV-ES and SEV-SNP guest using the AmdSev package. I have not tested the changes to the CloudHv or the Microvm packages.
Integration Instructions
N/A