linux-kernel - Re: [PATCH v8 09/43] KVM: arm64: Allow passing machine type in KVM creation

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Message-ID: <9c998d71-0368-4f93-ab37-7933bec9b419@redhat.com>
Date: Wed, 30 Apr 2025 15:47:33 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>,
 Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
 <yuzenghui@...wei.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Joey Gouly <joey.gouly@....com>,
 Alexandru Elisei <alexandru.elisei@....com>,
 Christoffer Dall <christoffer.dall@....com>, Fuad Tabba <tabba@...gle.com>,
 linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>,
 Shanker Donthineni <sdonthineni@...dia.com>, Alper Gun
 <alpergun@...gle.com>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v8 09/43] KVM: arm64: Allow passing machine type in KVM
 creation

On 4/16/25 11:41 PM, Steven Price wrote:
> Previously machine type was used purely for specifying the physical
> address size of the guest. Reserve the higher bits to specify an ARM
> specific machine type and declare a new type 'KVM_VM_TYPE_ARM_REALM'
> used to create a realm guest.
> 
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v7:
>   * Add some documentation explaining the new machine type.
> Changes since v6:
>   * Make the check for kvm_rme_is_available more visible and report an
>     error code of -EPERM (instead of -EINVAL) to make it explicit that
>     the kernel supports RME, but the platform doesn't.
> ---
>   Documentation/virt/kvm/api.rst | 16 ++++++++++++++--
>   arch/arm64/kvm/arm.c           | 15 +++++++++++++++
>   arch/arm64/kvm/mmu.c           |  3 ---
>   include/uapi/linux/kvm.h       | 19 +++++++++++++++----
>   4 files changed, 44 insertions(+), 9 deletions(-)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>