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contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,thomas.lendacky@amd.com X-Gm-Message-State: RzACULRXlbcvoVxYdNZbjEYbx1787277AA= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1589925111; bh=hQY0GcUp+ENu0ec/ugmdV4wU6KgcaGMhmEChZTSr2fY=; h=Cc:Content-Type:Date:From:Reply-To:Subject:To; b=VZMjM9pJIhEeHf7V/DkSe6/wM3qp/HKFqPoZ8KtIFMfw1xPKdcNotDR0+iHD46bgn6z ZDuGm7GwW9uP5hD/tZtNdq78GWmbiQFBvcD4Fx9yTVxQioC6fuKtTk/NsXW6zYFxOL+5I 4UWJRC5ySrb7+YvnMsigSePeGN5DVOqPtyI= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D2198 Under SEV-ES, a RDTSC 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 Acked-by: Laszlo Ersek --- .../Library/VmgExitLib/X64/VmgExitVcHandler.c | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c b/OvmfPkg/Li= brary/VmgExitLib/X64/VmgExitVcHandler.c index 0cf26c052b32..3d2a9c6f9bc9 100644 --- a/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c +++ b/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c @@ -1214,6 +1214,45 @@ CpuidExit ( return 0; } =20 +/** + Handle a RDTSC event. + + Use the VMGEXIT instruction to handle a RDTSC 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 + + @retval 0 Event handled successfully + @retval Others New exception value to propagate + +**/ +STATIC +UINT64 +RdtscExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINT64 Status; + + Status =3D VmgExit (Ghcb, SVM_EXIT_RDTSC, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + return UnsupportedExit (Ghcb, Regs, InstructionData); + } + Regs->Rax =3D Ghcb->SaveArea.Rax; + Regs->Rdx =3D Ghcb->SaveArea.Rdx; + + return 0; +} + /** Handle a #VC exception. =20 @@ -1258,6 +1297,10 @@ VmgExitHandleVc ( =20 ExitCode =3D Regs->ExceptionData; switch (ExitCode) { + case SVM_EXIT_RDTSC: + NaeExit =3D RdtscExit; + break; + case SVM_EXIT_CPUID: NaeExit =3D CpuidExit; break; --=20 2.17.1 -=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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