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OvmfPkg: Define a new PPI GUID to signal TPM MMIO accessability

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Define a new PPI GUID that is to be used as a signal of when it is safe
to access the TPM MMIO range. This is needed so that, when SEV is active,
the MMIO range can be mapped unencrypted before it is accessed.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <03e292339273721724c8b14605cfe9d7bbe45a71.1619716333.git.thomas.lendacky@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Lendacky, Thomas 2021-04-29 12:12:12 -05:00 committed by mergify[bot]
parent cc71bd9709
commit a3f12cd471
1 changed files with 4 additions and 0 deletions
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4
OvmfPkg/OvmfPkg.dec
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@ -128,6 +128,10 @@
# has been discovered and recorded
gOvmfTpmDiscoveredPpiGuid = {0xb9a61ad0, 0x2802, 0x41f3, {0xb5, 0x13, 0x96, 0x51, 0xce, 0x6b, 0xd5, 0x75}}
# This PPI signals that accessing the MMIO range of the TPM is possible in
# the PEI phase, regardless of memory encryption
gOvmfTpmMmioAccessiblePpiGuid = {0x35c84ff2, 0x7bfe, 0x453d, {0x84, 0x5f, 0x68, 0x3a, 0x49, 0x2c, 0xf7, 0xb7}}
[Protocols]
gVirtioDeviceProtocolGuid = {0xfa920010, 0x6785, 0x4941, {0xb6, 0xec, 0x49, 0x8c, 0x57, 0x9f, 0x16, 0x0a}}
gXenBusProtocolGuid = {0x3d3ca290, 0xb9a5, 0x11e3, {0xb7, 0x5d, 0xb8, 0xac, 0x6f, 0x7d, 0x65, 0xe6}}