Apologies for the late review. I added my comments on GH. Aside from a request for more context for https://github.com/tianocore/edk2/commit/b7387dae40cc3a72562c6461d007d20087ab7414#comments, I think this patch set from a functionality standpoint looks good enough to be submitted.

Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>

From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Tuan Phan
Sent: Wednesday, April 19, 2023 5:37 PM
To: devel@edk2.groups.io; Warkentin, Andrei <andrei.warkentin@intel.com>
Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>; sunilvl@ventanamicro.com; git@danielschaefer.me
Subject: Re: [edk2-devel] [PATCH v2 0/6] RISC-V MMU support

Hi Andrei,

Here you go: https://github.com/pttuan/edk2/tree/tphan/riscv_mmu

Will put the link in the cover letter next round.

From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Andrei Warkentin <andrei.warkentin@intel.com>
Date: Tuesday, April 18, 2023 at 9:04 AM
To: Tuan Phan <tphan@ventanamicro.com>, devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Kinney, Michael D <michael.d.kinney@intel.com>, Gao, Liming <gaoliming@byosoft.com.cn>, Liu, Zhiguang <zhiguang.liu@intel.com>, sunilvl@ventanamicro.com <sunilvl@ventanamicro.com>, git@danielschaefer.me <git@danielschaefer.me>
Subject: Re: [edk2-devel] [PATCH v2 0/6] RISC-V MMU support

Hi Tuan,

Do you mind sharing the GitHub branch as well? It would help with the review immensely.

A

> -----Original Message-----
> From: Tuan Phan <tphan@ventanamicro.com>
> Sent: Friday, April 14, 2023 1:58 PM
> To: devel@edk2.groups.io
> Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Gao, Liming
> <gaoliming@byosoft.com.cn>; Liu, Zhiguang <zhiguang.liu@intel.com>;
> sunilvl@ventanamicro.com; git@danielschaefer.me; Warkentin, Andrei
> <andrei.warkentin@intel.com>; Tuan Phan <tphan@ventanamicro.com>
> Subject: [PATCH v2 0/6] RISC-V MMU support
>
> RISC-V: Add MMU support
>
> This series adds MMU support for RISC-V. Only SV39/48/57 modes are
> supported and tested. The MMU is required to support setting page
> attribute which is the first basic step to support security booting on RISC-V.
>
> There are three parts:
> 1. Add MMU base library. MMU will be enabled during CpuDxe initialization.
> 2. Fix OvmfPkg/VirtNorFlashDxe that failed to add flash base address to GCD
> if already done.
> 3. Fix all resources should be populated in HOB or added to GCD by driver
> before accessing when MMU enabled.
>
> Changes in v2:
>   - Move MMU core to a library.
>   - Setup SATP mode as highest possible that HW supports.
>
> Tuan Phan (6):
>   MdePkg/BaseLib: RISC-V: Support getting satp register value
>   MdePkg/Register: RISC-V: Add satp mode bits shift definition
>   UefiCpuPkg: RISC-V: Support MMU with SV39/48/57 mode
>   OvmfPkg/RiscVVirt: VirtNorFlashPlatformLib: Fix wrong flash size
>   OvmfPkg/VirtNorFlashDxe: Not add memory space if it exists
>   OvmfPkg/RiscVVirt: SEC: Add IO memory resource hob for platform
>     devices
>
>  MdePkg/Include/Library/BaseLib.h              |   5 +
>  MdePkg/Include/Library/BaseRiscVMmuLib.h      |  39 ++
>  .../Include/Register/RiscV64/RiscVEncoding.h  |   7 +-
>  MdePkg/Library/BaseLib/RiscV64/RiscVMmu.S     |   8 +
>  .../Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c | 569
> ++++++++++++++++++
>  .../BaseRiscVMmuLib/BaseRiscVMmuLib.inf       |  25 +
>  MdePkg/Library/BaseRiscVMmuLib/RiscVMmuCore.S |  31 +
>  .../VirtNorFlashStaticLib.c                   |   3 +-
>  OvmfPkg/RiscVVirt/RiscVVirt.dsc.inc           |   1 +
>  OvmfPkg/RiscVVirt/Sec/Memory.c                |  18 +-
>  OvmfPkg/RiscVVirt/Sec/Platform.c              |  62 ++
>  OvmfPkg/RiscVVirt/Sec/SecMain.inf             |   1 +
>  OvmfPkg/VirtNorFlashDxe/VirtNorFlashDxe.c     |  25 +-
>  UefiCpuPkg/CpuDxeRiscV64/CpuDxe.c             |   9 +-
>  UefiCpuPkg/CpuDxeRiscV64/CpuDxe.h             |   2 +
>  UefiCpuPkg/CpuDxeRiscV64/CpuDxeRiscV64.inf    |   2 +
>  16 files changed, 776 insertions(+), 31 deletions(-)  create mode 100644
> MdePkg/Include/Library/BaseRiscVMmuLib.h
>  create mode 100644
> MdePkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.c
>  create mode 100644
> MdePkg/Library/BaseRiscVMmuLib/BaseRiscVMmuLib.inf
>  create mode 100644 MdePkg/Library/BaseRiscVMmuLib/RiscVMmuCore.S
>
> --
> 2.25.1