linux-kernel - Re: [PATCH 03/10] Documentation: kvm/sev: separate description of firmware

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Date: Wed, 14 Feb 2024 17:23:10 -0600
From: Michael Roth <michael.roth@....com>
To: Paolo Bonzini <pbonzini@...hat.com>
CC: <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<seanjc@...gle.com>, <aik@....com>, <isaku.yamahata@...el.com>
Subject: Re: [PATCH 03/10] Documentation: kvm/sev: separate description of
 firmware

On Fri, Feb 09, 2024 at 01:37:35PM -0500, Paolo Bonzini wrote:
> The description of firmware is included part under the "SEV Key Management"
> header, part under the KVM_SEV_INIT ioctl.  Put these two bits together and
> and rename "SEV Key Management" to what it actually is, namely a description
> of the KVM_MEMORY_ENCRYPT_OP API.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Reviewed-by: Michael Roth <michael.roth@....com>

> ---
>  .../virt/kvm/x86/amd-memory-encryption.rst    | 29 +++++++++++--------
>  1 file changed, 17 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/virt/kvm/x86/amd-memory-encryption.rst b/Documentation/virt/kvm/x86/amd-memory-encryption.rst
> index 995780088eb2..37c5c37f4f6e 100644
> --- a/Documentation/virt/kvm/x86/amd-memory-encryption.rst
> +++ b/Documentation/virt/kvm/x86/amd-memory-encryption.rst
> @@ -46,14 +46,8 @@ SEV hardware uses ASIDs to associate a memory encryption key with a VM.
>  Hence, the ASID for the SEV-enabled guests must be from 1 to a maximum value
>  defined in the CPUID 0x8000001f[ecx] field.
>  
> -SEV Key Management
> -==================
> -
> -The SEV guest key management is handled by a separate processor called the AMD
> -Secure Processor (AMD-SP). Firmware running inside the AMD-SP provides a secure
> -key management interface to perform common hypervisor activities such as
> -encrypting bootstrap code, snapshot, migrating and debugging the guest. For more
> -information, see the SEV Key Management spec [api-spec]_
> +``KVM_MEMORY_ENCRYPT_OP`` API
> +=============================
>  
>  The main ioctl to access SEV is KVM_MEMORY_ENCRYPT_OP.  If the argument
>  to KVM_MEMORY_ENCRYPT_OP is NULL, the ioctl returns 0 if SEV is enabled
> @@ -87,10 +81,6 @@ guests, such as launching, running, snapshotting, migrating and decommissioning.
>  The KVM_SEV_INIT command is used by the hypervisor to initialize the SEV platform
>  context. In a typical workflow, this command should be the first command issued.
>  
> -The firmware can be initialized either by using its own non-volatile storage or
> -the OS can manage the NV storage for the firmware using the module parameter
> -``init_ex_path``. If the file specified by ``init_ex_path`` does not exist or
> -is invalid, the OS will create or override the file with output from PSP.
>  
>  Returns: 0 on success, -negative on error
>  
> @@ -434,6 +424,21 @@ issued by the hypervisor to make the guest ready for execution.
>  
>  Returns: 0 on success, -negative on error
>  
> +Firmware Management
> +===================
> +
> +The SEV guest key management is handled by a separate processor called the AMD
> +Secure Processor (AMD-SP). Firmware running inside the AMD-SP provides a secure
> +key management interface to perform common hypervisor activities such as
> +encrypting bootstrap code, snapshot, migrating and debugging the guest. For more
> +information, see the SEV Key Management spec [api-spec]_
> +
> +The AMD-SP firmware can be initialized either by using its own non-volatile
> +storage or the OS can manage the NV storage for the firmware using
> +parameter ``init_ex_path`` of the ``ccp`` module. If the file specified
> +by ``init_ex_path`` does not exist or is invalid, the OS will create or
> +override the file with PSP non-volatile storage.
> +
>  References
>  ==========
>  
> -- 
> 2.39.0
> 
> 
>