OvmfPkg/UefiCpuPkg/UefiPayloadPkg: Rename VmgExitLib to CcExitLib
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4123 VmgExitLib once was designed to provide interfaces to support #VC handler and issue VMGEXIT instruction. After TDVF (enable TDX feature in OVMF) is introduced, this library is updated to support #VE as well. Now the name of VmgExitLib cannot reflect what the lib does. This patch renames VmgExitLib to CcExitLib (Cc means Confidential Computing). This is a simple renaming and there is no logic changes. After renaming all the VmgExitLib related codes are updated with CcExitLib. These changes are in OvmfPkg/UefiCpuPkg/UefiPayloadPkg. Cc: Guo Dong <guo.dong@intel.com> Cc: Sean Rhodes <sean@starlabs.systems> Cc: James Lu <james.lu@intel.com> Cc: Gua Guo <gua.guo@intel.com> Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: James Lu <james.lu@intel.com> Reviewed-by: Gua Guo <gua.guo@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>
This commit is contained in:
Min M Xu
mergify[bot]
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OvmfPkg/Library/CcExitLib/X64/TdVmcallCpuid.nasm
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OvmfPkg/Library/CcExitLib/X64/TdVmcallCpuid.nasm
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;------------------------------------------------------------------------------
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;*
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;* Copyright (c) 2020 - 2021, Intel Corporation. All rights reserved.<BR>
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;* SPDX-License-Identifier: BSD-2-Clause-Patent
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;*
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;*
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;------------------------------------------------------------------------------
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DEFAULT REL
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SECTION .text
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%define TDVMCALL_EXPOSE_REGS_MASK 0xffec
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%define TDVMCALL 0x0
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%define EXIT_REASON_CPUID 0xa
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%macro tdcall 0
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db 0x66,0x0f,0x01,0xcc
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%endmacro
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%macro tdcall_push_regs 0
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push rbp
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mov rbp, rsp
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push r15
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push r14
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push r13
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push r12
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push rbx
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push rsi
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push rdi
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%endmacro
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%macro tdcall_pop_regs 0
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pop rdi
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pop rsi
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pop rbx
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pop r12
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pop r13
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pop r14
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pop r15
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pop rbp
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%endmacro
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%define number_of_regs_pushed 8
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%define number_of_parameters 4
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;
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; Keep these in sync for push_regs/pop_regs, code below
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; uses them to find 5th or greater parameters
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;
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%define first_variable_on_stack_offset \
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((number_of_regs_pushed * 8) + (number_of_parameters * 8) + 8)
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%define second_variable_on_stack_offset \
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((first_variable_on_stack_offset) + 8)
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%macro tdcall_regs_preamble 2
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mov rax, %1
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xor rcx, rcx
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mov ecx, %2
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; R10 = 0 (standard TDVMCALL)
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xor r10d, r10d
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; Zero out unused (for standard TDVMCALL) registers to avoid leaking
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; secrets to the VMM.
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xor ebx, ebx
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xor esi, esi
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xor edi, edi
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xor edx, edx
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xor ebp, ebp
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xor r8d, r8d
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xor r9d, r9d
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xor r14, r14
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xor r15, r15
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%endmacro
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%macro tdcall_regs_postamble 0
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xor ebx, ebx
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xor esi, esi
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xor edi, edi
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xor ecx, ecx
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xor edx, edx
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xor r8d, r8d
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xor r9d, r9d
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xor r10d, r10d
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xor r11d, r11d
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%endmacro
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;------------------------------------------------------------------------------
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; 0 => RAX = TDCALL leaf / TDVMCALL
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; M => RCX = TDVMCALL register behavior
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; 0xa => R11 = TDVMCALL function / CPUID
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; RCX => R12 = p1
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; RDX => R13 = p2
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;
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; UINT64
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; EFIAPI
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; TdVmCallCpuid (
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; UINT64 EaxIn, // Rcx
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; UINT64 EcxIn, // Rdx
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; UINT64 *Results // R8
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; )
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global ASM_PFX(TdVmCallCpuid)
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ASM_PFX(TdVmCallCpuid):
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tdcall_push_regs
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mov r11, EXIT_REASON_CPUID
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mov r12, rcx
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mov r13, rdx
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; Save *results pointers
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push r8
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tdcall_regs_preamble TDVMCALL, TDVMCALL_EXPOSE_REGS_MASK
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tdcall
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; ignore return data if TDCALL reports failure.
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test rax, rax
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jnz .no_return_data
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; Propagate TDVMCALL success/failure to return value.
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mov rax, r10
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test rax, rax
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jnz .no_return_data
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; Retrieve *Results
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pop r8
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test r8, r8
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jz .no_return_data
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; Caller pass in buffer so store results r12-r15 contains eax-edx
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mov [r8 + 0], r12
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mov [r8 + 8], r13
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mov [r8 + 16], r14
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mov [r8 + 24], r15
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.no_return_data:
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tdcall_regs_postamble
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tdcall_pop_regs
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ret
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