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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: VR0Rf6pE2AjFaUBo7ct7tTzvx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1591363696; bh=oNzr49KAj2B3INoLWXng8vCgklnYoZbWiHFD/naivOI=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=oQMOcV78JLKdxdBJyNc6ZgUayQExDw8ajHg/PdZhZq9nf7QnXhYqCnja3Hn6Bu2OerQ FEcN5OrQYu8EsuNkkgQk5B2smpiNno+CtQJmFPFqZMby134whgYPgUlOtNza7lqECMDbX yikYdRI3Rbqz7Q3LSkb3RIH1AU35yhT3Jmg= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Type: text/plain; charset="utf-8" BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D2198 Under SEV-ES, a MWAIT/MWAITX 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 Acked-by: Laszlo Ersek Signed-off-by: Tom Lendacky --- OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 36 ++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Librar= y/VmgExitLib/VmgExitVcHandler.c index bb068a45ae00..9d93e30a8ea4 100644 --- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c +++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c @@ -854,6 +854,38 @@ MmioExit ( return Status; } =20 +/** + Handle a MWAIT event. + + Use the VMGEXIT instruction to handle a MWAIT event. + + @param[in, out] Ghcb Pointer to the Guest-Hypervisor Communi= cation + Block + @param[in, out] Regs x64 processor context + @param[in] InstructionData Instruction parsing context + + @return 0 Event handled successfully + @return Others New exception value to propagate + +**/ +STATIC +UINT64 +MwaitExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + DecodeModRm (Regs, InstructionData); + + Ghcb->SaveArea.Rax =3D Regs->Rax; + GhcbSetRegValid (Ghcb, GhcbRax); + Ghcb->SaveArea.Rcx =3D Regs->Rcx; + GhcbSetRegValid (Ghcb, GhcbRcx); + + return VmgExit (Ghcb, SVM_EXIT_MWAIT, 0, 0); +} + /** Handle a MONITOR event. =20 @@ -1530,6 +1562,10 @@ VmgExitHandleVc ( NaeExit =3D MonitorExit; break; =20 + case SVM_EXIT_MWAIT: + NaeExit =3D MwaitExit; + break; + case SVM_EXIT_NPF: NaeExit =3D MmioExit; break; --=20 2.27.0 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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