linux-kernel - Re: [PATCH v1 1/8] include/acpi: add definition of ASPT table

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Message-ID: <CAJZ5v0i=NDrHAQYQPfvBGvkvBzNnDhUxxPivQ1VaZ8HBhAyS0A@mail.gmail.com>
Date:   Mon, 23 Jan 2023 20:56:32 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
Cc:     linux-kernel@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v1 1/8] include/acpi: add definition of ASPT table

On Mon, Jan 23, 2023 at 4:23 PM Jeremi Piotrowski
<jpiotrowski@...ux.microsoft.com> wrote:
>
> The AMD Secure Processor ACPI Table provides the memory location of the
> register window and register offsets necessary to communicate with AMD's
> PSP (Platform Security Processor). This table is exposed on Hyper-V VMs
> configured with support for AMD's SNP isolation technology.
>
> Signed-off-by: Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>

This modifies the ACPICA code, so it should at least be submitted as a
pull request to the upstream ACPICA project on GitHub.

Thanks!

> ---
>  include/acpi/actbl1.h | 46 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>
> diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
> index 15c78678c5d3..00d40373df37 100644
> --- a/include/acpi/actbl1.h
> +++ b/include/acpi/actbl1.h
> @@ -26,6 +26,7 @@
>   */
>  #define ACPI_SIG_AEST           "AEST" /* Arm Error Source Table */
>  #define ACPI_SIG_ASF            "ASF!" /* Alert Standard Format table */
> +#define ACPI_SIG_ASPT           "ASPT" /* AMD Secure Processor Table */
>  #define ACPI_SIG_BERT           "BERT" /* Boot Error Record Table */
>  #define ACPI_SIG_BGRT           "BGRT" /* Boot Graphics Resource Table */
>  #define ACPI_SIG_BOOT           "BOOT" /* Simple Boot Flag Table */
> @@ -106,6 +107,51 @@ struct acpi_whea_header {
>         u64 mask;               /* Bitmask required for this register instruction */
>  };
>
> +/* https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/acpitabl/ns-acpitabl-aspt_table */
> +#define ASPT_REVISION_ID 0x01
> +struct acpi_table_aspt {
> +       struct acpi_table_header header;
> +       u32 num_entries;
> +};
> +
> +struct acpi_aspt_header {
> +       u16 type;
> +       u16 length;
> +};
> +
> +enum acpi_aspt_type {
> +       ACPI_ASPT_TYPE_GLOBAL_REGS = 0,
> +       ACPI_ASPT_TYPE_SEV_MBOX_REGS = 1,
> +       ACPI_ASPT_TYPE_ACPI_MBOX_REGS = 2,
> +};
> +
> +/* 0: ASPT Global Registers */
> +struct acpi_aspt_global_regs {
> +       struct acpi_aspt_header header;
> +       u32 reserved;
> +       u64 feature_reg_addr;
> +       u64 irq_en_reg_addr;
> +       u64 irq_st_reg_addr;
> +};
> +
> +/* 1: ASPT SEV Mailbox Registers */
> +struct acpi_aspt_sev_mbox_regs {
> +       struct acpi_aspt_header header;
> +       u8 mbox_irq_id;
> +       u8 reserved[3];
> +       u64 cmd_resp_reg_addr;
> +       u64 cmd_buf_lo_reg_addr;
> +       u64 cmd_buf_hi_reg_addr;
> +};
> +
> +/* 2: ASPT ACPI Mailbox Registers */
> +struct acpi_aspt_acpi_mbox_regs {
> +       struct acpi_aspt_header header;
> +       u32 reserved1;
> +       u64 cmd_resp_reg_addr;
> +       u64 reserved2[2];
> +};
> +
>  /*******************************************************************************
>   *
>   * ASF - Alert Standard Format table (Signature "ASF!")
> --
> 2.25.1
>