61bacc0fa1
The base VmgExitLib library provides a default limited interface. As it does not provide full support, create an OVMF version of this library to begin the process of providing full support of SEV-ES within OVMF. SEV-ES support is only provided for X64 builds, so only OvmfPkgX64.dsc is updated to make use of the OvmfPkg version of the library. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/** @file
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X64 #VC Exception Handler functon.
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Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Uefi.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/VmgExitLib.h>
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#include <Register/Amd/Msr.h>
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/**
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Handle a #VC exception.
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Performs the necessary processing to handle a #VC exception.
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@param[in, out] ExceptionType Pointer to an EFI_EXCEPTION_TYPE to be set
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as value to use on error.
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@param[in, out] SystemContext Pointer to EFI_SYSTEM_CONTEXT
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@retval EFI_SUCCESS Exception handled
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@retval EFI_UNSUPPORTED #VC not supported, (new) exception value to
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propagate provided
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@retval EFI_PROTOCOL_ERROR #VC handling failed, (new) exception value to
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propagate provided
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**/
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EFI_STATUS
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EFIAPI
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VmgExitHandleVc (
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IN OUT EFI_EXCEPTION_TYPE *ExceptionType,
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IN OUT EFI_SYSTEM_CONTEXT SystemContext
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)
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{
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MSR_SEV_ES_GHCB_REGISTER Msr;
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EFI_SYSTEM_CONTEXT_X64 *Regs;
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GHCB *Ghcb;
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UINT64 ExitCode, Status;
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EFI_STATUS VcRet;
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VcRet = EFI_SUCCESS;
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Msr.GhcbPhysicalAddress = AsmReadMsr64 (MSR_SEV_ES_GHCB);
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ASSERT (Msr.GhcbInfo.Function == 0);
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ASSERT (Msr.Ghcb != 0);
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Regs = SystemContext.SystemContextX64;
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Ghcb = Msr.Ghcb;
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VmgInit (Ghcb);
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ExitCode = Regs->ExceptionData;
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switch (ExitCode) {
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default:
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Status = VmgExit (Ghcb, SVM_EXIT_UNSUPPORTED, ExitCode, 0);
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if (Status == 0) {
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Regs->ExceptionData = 0;
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*ExceptionType = GP_EXCEPTION;
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} else {
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GHCB_EVENT_INJECTION Event;
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Event.Uint64 = Status;
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if (Event.Elements.ErrorCodeValid != 0) {
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Regs->ExceptionData = Event.Elements.ErrorCode;
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} else {
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Regs->ExceptionData = 0;
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}
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*ExceptionType = Event.Elements.Vector;
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}
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VcRet = EFI_PROTOCOL_ERROR;
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}
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VmgDone (Ghcb);
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return VcRet;
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}
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