Reviewed-by: Min Xu <min.m...@intel.com> > -----Original Message----- > From: Sun, CepingX <cepingx....@intel.com> > Sent: Tuesday, February 27, 2024 5:19 AM > To: devel@edk2.groups.io > Cc: Sun, CepingX <cepingx....@intel.com>; Liming Gao > <gaolim...@byosoft.com.cn>; Kinney, Michael D > <michael.d.kin...@intel.com>; Aktas, Erdem <erdemak...@google.com>; > James Bottomley <j...@linux.ibm.com>; Yao, Jiewen > <jiewen....@intel.com>; Xu, Min M <min.m...@intel.com>; Tom Lendacky > <thomas.lenda...@amd.com>; Michael Roth <michael.r...@amd.com>; > Gerd Hoffmann <kra...@redhat.com>; Yamahata, Isaku > <isaku.yamah...@intel.com> > Subject: [PATCH V1 0/3] OvmfPkg: Update TDVMCALL to avoid leaking secrets > to the VMM > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4696 > > According to section 2.4.1 of [GHCI] spec, RBP register is usually used as a > frame pointer according to the C language calling convention. > The software should not use RBP as an input/output parameter and should > clear BIT5 (RBP) in the GPR mask in RCX. > > Reference: > [GHCI]: TDX Guest-Host-Communication Interface v1.5 > https://cdrdv2.intel.com/v1/dl/getContent/726792 > > > Cc: Liming Gao <gaolim...@byosoft.com.cn> > Cc: Michael D Kinney <michael.d.kin...@intel.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> > Cc: Michael Roth <michael.r...@amd.com> > Cc: Gerd Hoffmann <kra...@redhat.com> > Cc: Isaku Yamahata <isaku.yamah...@intel.com> > Signed-off-by: Ceping Sun <cepingx....@intel.com> > > Ceping Sun (3): > MdePkg/BaseLib: Update TDVMCALL_EXPOSE_REGS_MASK > OvmfPkg/CcExitLib: Update TDVMCALL_EXPOSE_REGS_MASK > OvmfPkg/TdxDxe: Clear the registers before tdcall > > MdePkg/Library/BaseLib/X64/TdVmcall.nasm | 2 +- > .../Library/CcExitLib/X64/TdVmcallCpuid.nasm | 2 +- > OvmfPkg/TdxDxe/X64/ApRunLoop.nasm | 30 ++++++++++++++++--- > 3 files changed, 28 insertions(+), 6 deletions(-) > > -- > 2.34.1
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