Re: [edk2-devel] [PATCH v1 1/1] ArmVirtPkg: Kvmtool: Fix ACPI/DT boot selection

["Ard Biesheuvel" <ardb@kernel.org>]

Hello Sami,

On Tue, 26 Mar 2024 at 19:07, Sami Mujawar <sami.mujawar@arm.com> wrote:
>
> The Kvmtool guest firmware uses the dynamic HII
> PCD PcdForceNoAcpi to determine if ACPI tables
> or the DT must be used for booting an OS.
>
> This PcdForceNoAcpi is a BOOLEAN value that can
> be configured using the variable "ForceNoAcpi"
> specifing the gOvmfVariableGuid GUID which is
> "50BEA1E5-A2C5-46E9-9B3A-59596516B00A".
>
> However, this feature was not working as the
> PCD was not defined in the platform DSC file
> and the DEPEX section in KvmtoolPlatfomDxe.inf
> was not set correctly.
>

Understood. I do wonder whether gEfiVariableArchProtocolGuid is the
appropriate protocol here to DEPEX on. Shouldn't PcdDxe depend on this
already, and should we depend on the PCD protocol instead?

Other than that, this looks fine to me.

> Therefore, fix this issue so that the ACPI/DT
> boot selection can be done from the UEFI shell
> as shown below.
>
> 1. Check the status of the 'ForceNoAcpi' variable
>    setvar ForceNoAcpi -guid
>      "50BEA1E5-A2C5-46E9-9B3A-59596516B00A"
>      -nv -bs
>
>     Value 00 indicates ACPI boot
>     Value 01 indicates DT boot
>
> 2. Set the boot mode to ACPI
>    setvar ForceNoAcpi -guid
>      "50BEA1E5-A2C5-46E9-9B3A-59596516B00A"
>      -nv -bs =0x00
>
> 3. Set the boot mode to DT
>    setvar ForceNoAcpi -guid
>      "50BEA1E5-A2C5-46E9-9B3A-59596516B00A"
>      -nv -bs =0x01
>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Cc: Leif Lindholm <quic_llindhol@quicinc.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
> ---
> The changes can be seen at:
> https://github.com/samimujawar/edk2/tree/2954_kvmtool_fix_acpi_dt_selection_v1
>
>  ArmVirtPkg/ArmVirtKvmTool.dsc                        | 14 ++++++++++++++
>  ArmVirtPkg/KvmtoolPlatformDxe/KvmtoolPlatformDxe.inf |  2 +-
>  2 files changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/ArmVirtPkg/ArmVirtKvmTool.dsc b/ArmVirtPkg/ArmVirtKvmTool.dsc
> index 20da3319667900e64755272fa110d57452d1fc67..c3c27b2765b34599c7312026ce5cb9474a22c684 100644
> --- a/ArmVirtPkg/ArmVirtKvmTool.dsc
> +++ b/ArmVirtPkg/ArmVirtKvmTool.dsc
> @@ -189,6 +189,20 @@ [PcdsPatchableInModule.common]
>  [PcdsDynamicHii]
>    gEfiMdePkgTokenSpaceGuid.PcdPlatformBootTimeOut|L"Timeout"|gEfiGlobalVariableGuid|0x0|5
>
> +  #
> +  #  Dynamic Hii PCD to select ACPI/DT boot.
> +  #
> +  #   1. Check the status of the 'ForceNoAcpi' variable
> +  #      setvar ForceNoAcpi -guid "50BEA1E5-A2C5-46E9-9B3A-59596516B00A" -nv -bs
> +  #        Value 00 indicates ACPI boot
> +  #        Value 01 indicates DT boot
> +  #   2. Set the boot mode to ACPI
> +  #      setvar ForceNoAcpi -guid "50BEA1E5-A2C5-46E9-9B3A-59596516B00A" -nv -bs =0x00
> +  #   3. Set the boot mode to DT
> +  #      setvar ForceNoAcpi -guid "50BEA1E5-A2C5-46E9-9B3A-59596516B00A" -nv -bs =0x01
> +  #
> +  gUefiOvmfPkgTokenSpaceGuid.PcdForceNoAcpi|L"ForceNoAcpi"|gOvmfVariableGuid|0x0|FALSE|NV,BS
> +
>  [PcdsDynamicDefault.common]
>    gArmTokenSpaceGuid.PcdArmArchTimerSecIntrNum|0x0
>    gArmTokenSpaceGuid.PcdArmArchTimerIntrNum|0x0
> diff --git a/ArmVirtPkg/KvmtoolPlatformDxe/KvmtoolPlatformDxe.inf b/ArmVirtPkg/KvmtoolPlatformDxe/KvmtoolPlatformDxe.inf
> index b0583d52058805aaeece31d7e3776ac498f101ad..508bfa60c2c2cb3f3e7456b010f4e9057437cda8 100644
> --- a/ArmVirtPkg/KvmtoolPlatformDxe/KvmtoolPlatformDxe.inf
> +++ b/ArmVirtPkg/KvmtoolPlatformDxe/KvmtoolPlatformDxe.inf
> @@ -42,4 +42,4 @@ [Pcd]
>    gUefiOvmfPkgTokenSpaceGuid.PcdForceNoAcpi
>
>  [Depex]
> -  TRUE
> +  gEfiVariableArchProtocolGuid
> --
> 'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
>


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