Secure-Boot related variables include the PK/KEK/DB/DBX and they are stored in NvVarStore (OVMF_VARS.fd). When lauching with -pflash, QEMU/OVMF will use emulated flash, and fully support UEFI variables. But when launching with -bios parameter, UEFI variables will be partially emulated, and non-volatile variables may lose their contents after a reboot. See OvmfPkg/README.
Tdx guest is an example that -pflash is not supported. So this patch-set is designed to initialize the NvVarStore with the content of in OVMF_VARS.fd. patch 1 - 2: Validate the integrity of OVMF_VARS.fd in Tdx guest. patch 3: Add a new function (AllocateRuntimePages) in PrePiMemoryAllocationLib. This function will be used in PeilessStartupLib which will run in SEC phase. patch 4 - 7: Then we add functions for EmuVariableNvStore in PlatformInitLib. This lib will then be called in OvmfPkg/PlatformPei and PeilessStartupLib. patch 8: At last a build-flag (SECURE_BOOT_FEATURE_ENABLED) is introduced in the dsc in OvmfPkg. Because the copy over of OVMR_VARS.fd to EmuVariableNvStore is only required when secure-boot is enabled. Code: https://github.com/mxu9/edk2/tree/secure-boot.v2 v2 changes: - The v1 title is "Enable Secure-Boot in Tdx guest". Because the patch-setwe was first designed to fix the gap when secure-boot feature was enabled in Tdx guest. After discussing with the community (see the disuccsions under https://edk2.groups.io/g/devel/message/90589) this patch-set can fix the secure-boot issue when OVMF is lauched with -bios parameter. So the title is updated. - Add a new function (AllocateRuntimePages) in PrePiMemoryAllocationLib. - Add build-flag SECURE_BOOT_FEATURE_ENABLED to control the copy over of OVMF_VARS.fd to EmuVariableNvStore. Cc: Leif Lindholm <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Abner Chang <[email protected]> Cc: Daniel Schaefer <[email protected]> Cc: Erdem Aktas <[email protected]> Cc: James Bottomley <[email protected]> [jejb] Cc: Jiewen Yao <[email protected]> [jyao1] Cc: Tom Lendacky <[email protected]> [tlendacky] Cc: Gerd Hoffmann <[email protected]> Signed-off-by: Min Xu <[email protected]> Min M Xu (8): OvmfPkg: Move TdxValidateCfv from PeilessStartupLib to PlatformInitLib OvmfPkg: Validate Cfv integrity in Tdx guest EmbeddedPkg: Add AllocateRuntimePages in PrePiMemoryAllocationLib OvmfPkg/PlatformInitLib: Add functions for EmuVariableNvStore OvmfPkg/PlatformPei: Update ReserveEmuVariableNvStore OvmfPkg: Reserve and init EmuVariableNvStore in Pei-less Startup OvmfPkg/TdxDxe: Set PcdEmuVariableNvStoreReserved OvmfPkg: Add build-flag SECURE_BOOT_FEATURE_ENABLED EmbeddedPkg/Include/Library/PrePiLib.h | 19 +++ .../MemoryAllocationLib.c | 64 ++++++-- OvmfPkg/CloudHv/CloudHvX64.dsc | 9 ++ OvmfPkg/Include/Library/PlatformInitLib.h | 51 ++++++ OvmfPkg/IntelTdx/IntelTdxX64.dsc | 9 ++ OvmfPkg/Library/PeilessStartupLib/IntelTdx.c | 153 ------------------ .../PeilessStartupLib/PeilessStartup.c | 7 + .../PeilessStartupInternal.h | 17 -- OvmfPkg/Library/PlatformInitLib/IntelTdx.c | 153 ++++++++++++++++++ OvmfPkg/Library/PlatformInitLib/Platform.c | 77 +++++++++ .../PlatformInitLib/PlatformInitLib.inf | 2 + OvmfPkg/OvmfPkgIa32.dsc | 9 ++ OvmfPkg/OvmfPkgIa32X64.dsc | 9 ++ OvmfPkg/OvmfPkgX64.dsc | 9 ++ OvmfPkg/PlatformPei/Platform.c | 25 +-- OvmfPkg/Sec/SecMain.c | 8 + OvmfPkg/Sec/SecMain.inf | 2 + OvmfPkg/TdxDxe/TdxDxe.c | 2 + OvmfPkg/TdxDxe/TdxDxe.inf | 1 + 19 files changed, 422 insertions(+), 204 deletions(-) -- 2.29.2.windows.2 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#90752): https://edk2.groups.io/g/devel/message/90752 Mute This Topic: https://groups.io/mt/91995187/21656 Group Owner: [email protected] Unsubscribe: https://edk2.groups.io/g/devel/unsub [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
