Reviewed-by: Jiewen Yao <jiewen....@intel.com>
> -----Original Message-----
> From: Gerd Hoffmann <kra...@redhat.com>
> Sent: Wednesday, April 24, 2024 2:00 PM
> To: devel@edk2.groups.io
> Cc: Oliver Steffen <ostef...@redhat.com>; Gerd Hoffmann
> <kra...@redhat.com>; Ard Biesheuvel <ardb+tianoc...@kernel.org>; Yao, Jiewen
> <jiewen....@intel.com>; Srikanth Aithal <srait...@amd.com>
> Subject: [PATCH v4 1/1] OvmfPkg/VirtHstiDxe: do not load driver in
> confidential
> guests
>
> The VirtHstiDxe does not work in confidential guests. There also isn't
> anything we can reasonably test, neither flash storage nor SMM mode will
> be used in that case. So just skip driver load when running in a
> confidential guest.
>
> Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
> Cc: Jiewen Yao <jiewen....@intel.com>
> Fixes: 506740982bba ("OvmfPkg/VirtHstiDxe: add code flash check")
> Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
> Tested-by: Srikanth Aithal <srait...@amd.com>
> ---
> OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf | 1 +
> OvmfPkg/VirtHstiDxe/VirtHstiDxe.c | 6 ++++++
> 2 files changed, 7 insertions(+)
>
> diff --git a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> index 9514933011e8..b5c237288766 100644
> --- a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> +++ b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> @@ -49,6 +49,7 @@ [FeaturePcd]
> gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire
>
> [Pcd]
> + gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr
> gUefiOvmfPkgTokenSpaceGuid.PcdBfvBase
> gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageVariableBase
>
> diff --git a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> index b6e53a1219d1..efaff0d1f3cb 100644
> --- a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> +++ b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> @@ -17,6 +17,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
> #include <Library/MemoryAllocationLib.h>
> #include <Library/UefiBootServicesTableLib.h>
> #include <Library/UefiLib.h>
> +#include <Library/PcdLib.h>
> #include <Library/PlatformInitLib.h>
>
> #include <IndustryStandard/Hsti.h>
> @@ -140,6 +141,11 @@ VirtHstiDxeEntrypoint (
> EFI_STATUS Status;
> EFI_EVENT Event;
>
> + if (PcdGet64 (PcdConfidentialComputingGuestAttr)) {
> + DEBUG ((DEBUG_INFO, "%a: confidential guest\n", __func__));
> + return EFI_UNSUPPORTED;
> + }
> +
> DevId = VirtHstiGetHostBridgeDevId ();
> switch (DevId) {
> case INTEL_82441_DEVICE_ID:
> --
> 2.44.0
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