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Subject: Re: [PATCH v9 15/46] OvmfPkg/VmgExitLib: Add support for CPUID NAE events
To: Tom Lendacky <thomas.lendacky@amd.com>, devel@edk2.groups.io
Cc: Brijesh Singh <brijesh.singh@amd.com>,
 Ard Biesheuvel <ard.biesheuvel@arm.com>, Eric Dong <eric.dong@intel.com>,
 Jordan Justen <jordan.l.justen@intel.com>, Liming Gao
 <liming.gao@intel.com>, Michael D Kinney <michael.d.kinney@intel.com>,
 Ray Ni <ray.ni@intel.com>
References: <cover.1591363657.git.thomas.lendacky@amd.com>
 <2b2b229690e2a2422e35c9a4df0431085c76b1ca.1591363657.git.thomas.lendacky@amd.com>
From: "Laszlo Ersek" <lersek@redhat.com>
Message-ID: <32f79eee-80e8-912f-c409-36f85ac3d918@redhat.com>
Date: Wed, 10 Jun 2020 14:41:13 +0200
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On 06/05/20 15:27, Tom Lendacky wrote:
> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
> 
> Under SEV-ES, a CPUID intercept generates a #VC exception. VMGEXIT must be
> used to allow the hypervisor to handle this intercept.
> 
> Add support to construct the required GHCB values to support a CPUID NAE
> event. Additionally, CPUID 0x0000_000d (CPUID_EXTENDED_STATE) requires
> XCR0 to be supplied in the GHCB, so add support to issue the XGETBV
> instruction.
> 
> 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>
> ---
>  OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 60 ++++++++++++++++++++
>  1 file changed, 60 insertions(+)

Looks fine, thanks