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Tue, 28 Jan 2025 20:08:00 -0800 (PST) X-Google-Smtp-Source: AGHT+IHQIoq8D2QaYFpzEq5kL3xdCHIiITAzdgGLjBLAtD4+BnGQNR/G88wzSm8jyqJiShrpZVo+NA== X-Received: by 2002:a17:902:ce01:b0:215:3a42:dc17 with SMTP id d9443c01a7336-21dd7c4c298mr26327115ad.7.1738123680051; Tue, 28 Jan 2025 20:08:00 -0800 (PST) Received: from [192.168.68.55] ([180.233.125.64]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21da41415e9sm90098135ad.116.2025.01.28.20.07.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Jan 2025 20:07:59 -0800 (PST) Message-ID: Date: Wed, 29 Jan 2025 14:07:51 +1000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 10/43] arm64: kvm: Allow passing machine type in KVM creation To: Steven Price , kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" References: <20241212155610.76522-1-steven.price@arm.com> <20241212155610.76522-11-steven.price@arm.com> Content-Language: en-US From: Gavin Shan In-Reply-To: <20241212155610.76522-11-steven.price@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/13/24 1:55 AM, 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 > Signed-off-by: Steven Price > --- > arch/arm64/kvm/arm.c | 17 +++++++++++++++++ > arch/arm64/kvm/mmu.c | 3 --- > include/uapi/linux/kvm.h | 19 +++++++++++++++---- > 3 files changed, 32 insertions(+), 7 deletions(-) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index c505ec61180a..73016e1e0067 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -207,6 +207,23 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) > mutex_unlock(&kvm->lock); > #endif > > + if (type & ~(KVM_VM_TYPE_ARM_MASK | KVM_VM_TYPE_ARM_IPA_SIZE_MASK)) > + return -EINVAL; > + > + switch (type & KVM_VM_TYPE_ARM_MASK) { > + case KVM_VM_TYPE_ARM_NORMAL: > + break; > + case KVM_VM_TYPE_ARM_REALM: > + kvm->arch.is_realm = true; > + if (!kvm_is_realm(kvm)) { > + /* Realm support unavailable */ > + return -EINVAL; > + } > + break; > + default: > + return -EINVAL; > + } > + > kvm_init_nested(kvm); > > ret = kvm_share_hyp(kvm, kvm + 1); Corresponding to comments for PATCH[6], the block of the code can be modified to avoid using kvm_is_realm() here. In this way, kvm_is_realm() can be simplifed as I commented for PATCH[6]. case KVM_VM_TYPE_ARM_REALM: if (static_branch_unlikely(&kvm_rme_is_available)) return -EPERM; /* -EPERM may be more suitable than -EINVAL */ kvm->arch.is_realm = true; break; Thanks, Gavin