linux-kernel - Re: [PATCH v3 4/5] EFI: Introduce the new AMD Memory Encryption GUID.

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Message-ID: <CAMj1kXGOaTR6bCHYtdapgM4wfzNTFQ5f-n5Jf0q28JEmsKimZw@mail.gmail.com>
Date:   Thu, 10 Jun 2021 17:01:54 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Ashish Kalra <Ashish.Kalra@....com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Tom Lendacky <Thomas.Lendacky@....com>,
        X86 ML <x86@...nel.org>, kvm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Steve Rutherford <srutherford@...gle.com>,
        Brijesh Singh <brijesh.singh@....com>,
        linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v3 4/5] EFI: Introduce the new AMD Memory Encryption GUID.

On Tue, 8 Jun 2021 at 20:07, Ashish Kalra <Ashish.Kalra@....com> wrote:
>
> From: Ashish Kalra <ashish.kalra@....com>
>
> Introduce a new AMD Memory Encryption GUID which is currently
> used for defining a new UEFI environment variable which indicates
> UEFI/OVMF support for the SEV live migration feature. This variable
> is setup when UEFI/OVMF detects host/hypervisor support for SEV
> live migration and later this variable is read by the kernel using
> EFI runtime services to verify if OVMF supports the live migration
> feature.
>
> Signed-off-by: Ashish Kalra <ashish.kalra@....com>

Acked-by: Ard Biesheuvel <ardb@...nel.org>

> ---
>  include/linux/efi.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 6b5d36babfcc..dbd39b20e034 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -362,6 +362,7 @@ void efi_native_runtime_setup(void);
>
>  /* OEM GUIDs */
>  #define DELLEMC_EFI_RCI2_TABLE_GUID            EFI_GUID(0x2d9f28a2, 0xa886, 0x456a,  0x97, 0xa8, 0xf1, 0x1e, 0xf2, 0x4f, 0xf4, 0x55)
> +#define AMD_SEV_MEM_ENCRYPT_GUID               EFI_GUID(0x0cf29b71, 0x9e51, 0x433a,  0xa3, 0xb7, 0x81, 0xf3, 0xab, 0x16, 0xb8, 0x75)
>
>  typedef struct {
>         efi_guid_t guid;
> --
> 2.17.1
>