linux-kernel - RE: [PATCH hyperv-next v8 01/11] arm64: kvm, smccc: Introduce and use API for getting hypervisor UUID

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Date: Thu, 17 Apr 2025 15:27:14 +0000
From: Michael Kelley <mhklinux@...look.com>
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Subject: RE: [PATCH hyperv-next v8 01/11] arm64: kvm, smccc: Introduce and use
 API for getting hypervisor UUID

From: Roman Kisel <romank@...ux.microsoft.com> Sent: Monday, April 14, 2025 3:47 PM
> 
> The KVM/arm64 uses SMCCC to detect hypervisor presence. That code is
> private, and it follows the SMCCC specification. Other existing and
> emerging hypervisor guest implementations can and should use that
> standard approach as well.
> 
> Factor out a common infrastructure that the guests can use, update KVM
> to employ the new API. The central notion of the SMCCC method is the
> UUID of the hypervisor, and the new API follows that.
> 
> No functional changes. Validated with a KVM/arm64 guest.
> 
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> ---
>  arch/arm64/kvm/hypercalls.c        | 10 +++--
>  drivers/firmware/smccc/kvm_guest.c | 10 +----
>  drivers/firmware/smccc/smccc.c     | 17 ++++++++
>  include/linux/arm-smccc.h          | 64 ++++++++++++++++++++++++++++--
>  4 files changed, 85 insertions(+), 16 deletions(-)
> 

Reviewed-by: Michael Kelley <mhklinux@...look.com>