From: James Bottomley <j...@linux.ibm.com> Split the existing 4KB page reserved for SEV launch secrets into two parts: first 3KB for SEV launch secrets and last 1KB for firmware config hashes.
The area of the firmware config hashes will be attested (measured) by the PSP and thus the untrusted VMM can't pass in different files from what the guest owner allows. Declare this in the Reset Vector table using GUID 7255371f-3a3b-4b04-927b-1da6efa8d454 and a uint32_t table of a base and size value (similar to the structure used to declare the launch secret block). Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org> Cc: Jordan Justen <jordan.l.jus...@intel.com> Cc: Ashish Kalra <ashish.ka...@amd.com> Cc: Brijesh Singh <brijesh.si...@amd.com> Cc: Erdem Aktas <erdemak...@google.com> Cc: James Bottomley <j...@linux.ibm.com> Cc: Jiewen Yao <jiewen....@intel.com> Cc: Min Xu <min.m...@intel.com> Cc: Tom Lendacky <thomas.lenda...@amd.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3457 Co-developed-by: Dov Murik <dovmu...@linux.ibm.com> Signed-off-by: Dov Murik <dovmu...@linux.ibm.com> Signed-off-by: James Bottomley <j...@linux.ibm.com> Reviewed-by: Tom Lendacky <thomas.lenda...@amd.com> Reviewed-by: Brijesh Singh <brijesh.si...@amd.com> --- OvmfPkg/OvmfPkg.dec | 6 ++++++ OvmfPkg/AmdSev/AmdSevX64.fdf | 5 ++++- OvmfPkg/ResetVector/ResetVector.inf | 2 ++ OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm | 20 ++++++++++++++++++++ OvmfPkg/ResetVector/ResetVector.nasmb | 2 ++ 5 files changed, 34 insertions(+), 1 deletion(-) diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec index f82228d69cc2..2ab27f0c73c2 100644 --- a/OvmfPkg/OvmfPkg.dec +++ b/OvmfPkg/OvmfPkg.dec @@ -324,6 +324,12 @@ [PcdsFixedAtBuild] gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase|0x0|UINT32|0x42 gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize|0x0|UINT32|0x43 + ## The base address and size of a hash table confirming allowed + # parameters to be passed in via the Qemu firmware configuration + # device + gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableBase|0x0|UINT32|0x47 + gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableSize|0x0|UINT32|0x48 + [PcdsDynamic, PcdsDynamicEx] gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent|0|UINT64|2 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashVariablesEnable|FALSE|BOOLEAN|0x10 diff --git a/OvmfPkg/AmdSev/AmdSevX64.fdf b/OvmfPkg/AmdSev/AmdSevX64.fdf index 9977b0f00a18..0a89749700c3 100644 --- a/OvmfPkg/AmdSev/AmdSevX64.fdf +++ b/OvmfPkg/AmdSev/AmdSevX64.fdf @@ -59,9 +59,12 @@ [FD.MEMFD] 0x00B000|0x001000 gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase|gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaSize -0x00C000|0x001000 +0x00C000|0x000C00 gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase|gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize +0x00CC00|0x000400 +gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableBase|gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableSize + 0x00D000|0x001000 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupSize diff --git a/OvmfPkg/ResetVector/ResetVector.inf b/OvmfPkg/ResetVector/ResetVector.inf index dc38f68919cd..d028c92d8cfa 100644 --- a/OvmfPkg/ResetVector/ResetVector.inf +++ b/OvmfPkg/ResetVector/ResetVector.inf @@ -47,3 +47,5 @@ [Pcd] [FixedPcd] gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretBase gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize + gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableBase + gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableSize diff --git a/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm b/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm index 9c0b5853a46f..7ec3c6e980c3 100644 --- a/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm +++ b/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm @@ -47,7 +47,27 @@ TIMES (15 - ((guidedStructureEnd - guidedStructureStart + 15) % 16)) DB 0 ; guidedStructureStart: +; SEV Hash Table Block ; +; This describes the guest ram area where the hypervisor should +; install a table describing the hashes of certain firmware configuration +; device files that would otherwise be passed in unchecked. The current +; use is for the kernel, initrd and command line values, but others may be +; added. The data format is: +; +; base physical address (32 bit word) +; table length (32 bit word) +; +; GUID (SEV FW config hash block): 7255371f-3a3b-4b04-927b-1da6efa8d454 +; +sevFwHashBlockStart: + DD SEV_FW_HASH_BLOCK_BASE + DD SEV_FW_HASH_BLOCK_SIZE + DW sevFwHashBlockEnd - sevFwHashBlockStart + DB 0x1f, 0x37, 0x55, 0x72, 0x3b, 0x3a, 0x04, 0x4b + DB 0x92, 0x7b, 0x1d, 0xa6, 0xef, 0xa8, 0xd4, 0x54 +sevFwHashBlockEnd: + ; SEV Secret block ; ; This describes the guest ram area where the hypervisor should diff --git a/OvmfPkg/ResetVector/ResetVector.nasmb b/OvmfPkg/ResetVector/ResetVector.nasmb index 5fbacaed5f9d..8d0bab02f8cb 100644 --- a/OvmfPkg/ResetVector/ResetVector.nasmb +++ b/OvmfPkg/ResetVector/ResetVector.nasmb @@ -88,5 +88,7 @@ %define SEV_ES_AP_RESET_IP FixedPcdGet32 (PcdSevEsWorkAreaBase) %define SEV_LAUNCH_SECRET_BASE FixedPcdGet32 (PcdSevLaunchSecretBase) %define SEV_LAUNCH_SECRET_SIZE FixedPcdGet32 (PcdSevLaunchSecretSize) + %define SEV_FW_HASH_BLOCK_BASE FixedPcdGet32 (PcdQemuHashTableBase) + %define SEV_FW_HASH_BLOCK_SIZE FixedPcdGet32 (PcdQemuHashTableSize) %include "Ia16/ResetVectorVtf0.asm" -- 2.25.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. 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