Re: [PATCH v1 0/5] Add ASPEED ACRY RSA model for the AST2600

On 8/13/26 08:24, Jamin Lin wrote:
> This series adds a model of the ASPEED ACRY engine found on the AST2600
> SoC, wires it into the SoC, and adds a qtest.
> 
> The ACRY engine performs RSA modular exponentiation (c = m^e mod n). It
> DMAs the operands (data, exponent, and modulus) from guest DRAM and writes
> the result to a dedicated 64 KiB SRAM region.
> 
> Guest firmware uses the engine for RSA signature verification during boot.
> Without a model, the guest starts the engine and waits indefinitely for a
> completion interrupt, causing the boot to hang.
> 
> The model uses QEMU's generic akcipher API to perform raw (unpadded) RSA.
> Raw RSA is currently supported only by the libgcrypt backend. When it is
> unavailable, the engine still completes and raises its interrupt, but
> returns an all-zero result. This allows the guest's signature verification
> to fail cleanly instead of hanging. The qtest is skipped when the selected
> crypto backend does not support raw RSA.

One can still use -Dgcrypt=enabled when gnutls is installed.

C.

> 
> Although the hardware documentation describes both RSA and ECDSA support,
> ECDSA is known to be broken on this hardware and is therefore not modeled.
> 
> v1:
>   1. Add ASPEED ACRY RSA model for the AST2600
>   2. Add qtest for AST2600 ASPEED ACRY RSA model
> 
> Jamin Lin (5):
>    hw/misc/aspeed_acry: Add ASPEED ACRY model
>    hw/arm/aspeed_ast2600: Introduce the ACRY SRAM
>    hw/arm/aspeed_soc: Add the ACRY model to AspeedSoCState
>    hw/arm/aspeed_ast2600: Wire up the ACRY model
>    tests/qtest/aspeed-acry-test: Add RSA ModExp tests
> 
>   include/hw/arm/aspeed_soc.h    |   3 +
>   include/hw/misc/aspeed_acry.h  |  50 ++++
>   hw/arm/aspeed_ast2600.c        |  33 +++
>   hw/misc/aspeed_acry.c          | 447 +++++++++++++++++++++++++++++++++
>   tests/qtest/aspeed-acry-test.c | 408 ++++++++++++++++++++++++++++++
>   hw/misc/meson.build            |   1 +
>   hw/misc/trace-events           |   6 +
>   tests/qtest/meson.build        |   5 +-
>   8 files changed, 952 insertions(+), 1 deletion(-)
>   create mode 100644 include/hw/misc/aspeed_acry.h
>   create mode 100644 hw/misc/aspeed_acry.c
>   create mode 100644 tests/qtest/aspeed-acry-test.c
>