Re: [edk2-devel] [PATCH 0/7] Add VirtMmCommunication driver, enable for OVMF and ArmVirt.

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

On Thu, 23 Nov 2023 at 16:02, Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> This is the edk2 side of the qemu patch series posted last week to
> qemu-devel:
>   https://lists.gnu.org/archive/html/qemu-devel/2023-11/msg03714.html
>
> The driver forwards MM calls to the virtualization host instead of the
> MM code running in SMM (x64) or el3 (arm) mode.  The functionality
> traditionally implemented by the SMM code is provided by qemu instead.
>
> This allows to provide persistent variable support without an
> (virtual) flash device and it also allows to support secure
> boot without depending on SMM or el3 emulation support in the
> hypervisor.
>

I like this a lot - not only for QEMU + OVMF/ArmVirt, but also for
other VM firmware projects (I am working on a minimal UEFI
implementation in Rust for ArmVirt, and variable support is much
easier to implement using this paravirt interface)


> Gerd Hoffmann (7):
>   OvmfPkg: add IndustryStandard/QemuUefiVars.h
>   OvmfPkg: add new VirtMmCommunicationDxe driver
>   OvmfPkg/OvmfPkgX64: add QEMU_VARS option
>   OvmfPkg: add PcdQemuVarsRequire
>   OvmfPkg/VirtMmCommunicationDxe: stop on init failure
>   OvmfPkg/VirtMmCommunicationDxe: add arm support
>   ArmVirtPkg/ArmVirtQemu: add QEMU_VARS option
>
>  OvmfPkg/OvmfPkg.dec                           |   3 +
>  ArmVirtPkg/ArmVirt.dsc.inc                    |   3 +
>  ArmVirtPkg/ArmVirtQemu.dsc                    |  11 +
>  ArmVirtPkg/ArmVirtQemuKernel.dsc              |  11 +
>  OvmfPkg/OvmfPkgX64.dsc                        |  17 +-
>  OvmfPkg/OvmfPkgX64.fdf                        |  12 +-
>  OvmfPkg/PlatformPei/PlatformPei.inf           |   1 +
>  .../VirtMmCommunication.inf                   |  67 +++
>  .../Include/IndustryStandard/QemuUefiVars.h   |  41 ++
>  .../VirtMmCommunication.h                     |  37 ++
>  OvmfPkg/PlatformPei/Platform.c                |   4 +
>  OvmfPkg/VirtMmCommunicationDxe/QemuFdt.c      | 208 ++++++++++
>  OvmfPkg/VirtMmCommunicationDxe/QemuX64.c      | 106 +++++
>  .../VirtMmCommunication.c                     | 390 ++++++++++++++++++
>  ArmVirtPkg/ArmVirtQemuFvMain.fdf.inc          |   5 +
>  15 files changed, 914 insertions(+), 2 deletions(-)
>  create mode 100644 OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.inf
>  create mode 100644 OvmfPkg/Include/IndustryStandard/QemuUefiVars.h
>  create mode 100644 OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.h
>  create mode 100644 OvmfPkg/VirtMmCommunicationDxe/QemuFdt.c
>  create mode 100644 OvmfPkg/VirtMmCommunicationDxe/QemuX64.c
>  create mode 100644 OvmfPkg/VirtMmCommunicationDxe/VirtMmCommunication.c
>
> --
> 2.42.0
>
>
>
> 
>
>


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