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X-MS-Exchange-AntiSpam-MessageData: 4b1JxJk03rC6u+n97jHzMlRDj8db2l5aOCyDJ/gBdwdgJqfCI/5433iUNEzzATyUv26PKi+zco18rRDCU8ebohrBYccqxZMgz9IUJCVxAUJIFBzuFj3QJRsV4TX11TcyE5mUy9K09b31WUKgUuyi9OUWSAc0VOsYtPJdg3OmuM8y6c4NWX0J2GRXCyW1Na0EWyDLN7EAQ8gyARogOqnoswDdYf3vDnYcB/iHuubzQL2DXI36mdIfG4rIHjiQ0On8y/eQlM4UQamBCHMrTkEfAXBu9UhScyxZy9qonFdlO7aptV4UMuiWAb2f3Lncd3nFBiJ+VGzBCE2SVt3FIoQmr0mKYOvzCchw5KSDbhUc0gkJyPfFbKs/uhSXPIf3MOjRyNjmg8AYbn/b3ISr9s/o3lKZDx9U2m1aaJCRtxpiLwW8aF9gGztSv54OsgORBiAUnXXBdlAgOtQsOxRjcub/6oDxVd9JTpC1m3xs6GZG2YM= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 557f521e-f1d3-4a0a-7436-08d7fc3ed73c X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 May 2020 21:51:52.7418 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 0x7cTKODhtJ+r3VhBuqP3HOXfFfh39iJc+4J8748PFxX/niMiwwUNsm2wRmJpk4wLGxdI6LbsnoRyV3ge+RdEw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB2504 Content-Type: text/plain BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 Under SEV-ES, a RDTSCP intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Cc: Jordan Justen Cc: Laszlo Ersek Cc: Ard Biesheuvel Signed-off-by: Tom Lendacky --- .../Library/VmgExitLib/X64/VmgExitVcHandler.c | 47 +++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c index bf1555234d69..716f21a9ee0e 100644 --- a/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c +++ b/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c @@ -875,6 +875,49 @@ WbinvdExit ( return 0; } +/** + Handle a RDTSCP event. + + Use the VMGEXIT instruction to handle either a RDTSCP event. + + @param[in, out] Ghcb Pointer to the Guest-Hypervisor Communication + Block + @param[in, out] Regs x64 processor context + @param[in] InstructionData Instruction parsing context + + @retval 0 Event handled successfully + @retval Others New exception value to propagate + +**/ +STATIC +UINT64 +RdtscpExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINT64 Status; + + DecodeModRm (Regs, InstructionData); + + Status = VmgExit (Ghcb, SVM_EXIT_RDTSCP, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRcx) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + return UnsupportedExit (Ghcb, Regs, InstructionData); + } + Regs->Rax = Ghcb->SaveArea.Rax; + Regs->Rcx = Ghcb->SaveArea.Rcx; + Regs->Rdx = Ghcb->SaveArea.Rdx; + + return 0; +} + /** Handle a VMMCALL event. @@ -1443,6 +1486,10 @@ VmgExitHandleVc ( NaeExit = VmmCallExit; break; + case SVM_EXIT_RDTSCP: + NaeExit = RdtscpExit; + break; + case SVM_EXIT_WBINVD: NaeExit = WbinvdExit; break; -- 2.17.1