From patchwork Thu Dec 12 15:55:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13905474 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id BDC3E229696; Thu, 12 Dec 2024 15:57:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734019040; cv=none; b=nrc8RFp4IIeJBjRvUJtkrfzo/jc4SqvGJEiIWt6vOQXjnyNhMANLQCzrmkmuxEr4TEx2uS0TzVPmle47atL+uTuPCK1d/YG1fsIylnGsmp5YiAwTMceAy29vdaTPosSOqbD4uXBUOVzclH1qcMGKgp3YQ4nkZqZC2usU6mP0+nk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734019040; c=relaxed/simple; bh=TJyi+bqs8AFhaNRO82/Fww3BAKjhZGZ4ahlFAIpBvLw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lVVm977M9L/EIqSInIsXp4KtArHtRdF7EjwIovQTXIGwtjmZYXQDIQqjek6V8vYJXO5Yeo+YGWqShrVe8ZZK61Y/bkANOHuRo12vEf+ecyaYP+WUzSMFto0ot437T5CbWcRye7HsCnLGxlPoAwrjU5ZB+xQJ5guBcIaazuL61+I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 69CBA1762; Thu, 12 Dec 2024 07:57:46 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.39.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0E9FD3F720; Thu, 12 Dec 2024 07:57:14 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , 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 , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" Subject: [PATCH v6 10/43] arm64: kvm: Allow passing machine type in KVM creation Date: Thu, 12 Dec 2024 15:55:35 +0000 Message-ID: <20241212155610.76522-11-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241212155610.76522-1-steven.price@arm.com> References: <20241212155610.76522-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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); diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index f09d580c12ad..f3b48895aee5 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -873,9 +873,6 @@ static int kvm_init_ipa_range(struct kvm *kvm, if (kvm_is_realm(kvm)) kvm_ipa_limit = kvm_realm_ipa_limit(); - if (type & ~KVM_VM_TYPE_ARM_IPA_SIZE_MASK) - return -EINVAL; - phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type); if (is_protected_kvm_enabled()) { phys_shift = kvm_ipa_limit; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index f448198838cf..05fb31ced849 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -648,14 +648,25 @@ struct kvm_enable_cap { #define KVM_S390_SIE_PAGE_OFFSET 1 /* - * On arm64, machine type can be used to request the physical - * address size for the VM. Bits[7-0] are reserved for the guest - * PA size shift (i.e, log2(PA_Size)). For backward compatibility, - * value 0 implies the default IPA size, 40bits. + * On arm64, machine type can be used to request both the machine type and + * the physical address size for the VM. + * + * Bits[11-8] are reserved for the ARM specific machine type. + * + * Bits[7-0] are reserved for the guest PA size shift (i.e, log2(PA_Size)). + * For backward compatibility, value 0 implies the default IPA size, 40bits. */ +#define KVM_VM_TYPE_ARM_SHIFT 8 +#define KVM_VM_TYPE_ARM_MASK (0xfULL << KVM_VM_TYPE_ARM_SHIFT) +#define KVM_VM_TYPE_ARM(_type) \ + (((_type) << KVM_VM_TYPE_ARM_SHIFT) & KVM_VM_TYPE_ARM_MASK) +#define KVM_VM_TYPE_ARM_NORMAL KVM_VM_TYPE_ARM(0) +#define KVM_VM_TYPE_ARM_REALM KVM_VM_TYPE_ARM(1) + #define KVM_VM_TYPE_ARM_IPA_SIZE_MASK 0xffULL #define KVM_VM_TYPE_ARM_IPA_SIZE(x) \ ((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK) + /* * ioctls for /dev/kvm fds: */