From patchwork Wed Aug 21 15:38:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13771794 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 89CD11B5EBD; Wed, 21 Aug 2024 15:39:49 +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=1724254791; cv=none; b=gDDuk1IeR6HpsGrdhT6Qs0b1/w47gDxxj1oGqSdiWkl2krpEbx8ODJgTGnI1cUGg+oGoUmemiEMj8n+oEd0lsKzq6GhD8jCTZ4WmqqNK+I2QHjm+zKoUX4XO1dhi8MXgQ1JntTFz1CozB9Gjz1in1u9KPOd07ZsliUuPJbhNFHk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724254791; c=relaxed/simple; bh=yQUG3G3e8YVuk/JHyq/w/vaJsmkAiHfihJowPYVK2tI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=TDUfCfftY0dnDT0nUljoWKOCAznyHo8Geg6mmSDWSDN/ywTR+9kmiIXNwMjkRsLIo1IuEnOZXv1KQ/MyiEpCMni3yExIZQX37TYM9Dge7lQ2dmn/GxVhZKxd+WGCK0aUqTK1xSLGlScr2UbHVQcj1Xq/uvLE0ssGMZjjaGLPA8g= 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 3C9A1FEC; Wed, 21 Aug 2024 08:40:15 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.37.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BD0063F73B; Wed, 21 Aug 2024 08:39:45 -0700 (PDT) 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 Subject: [PATCH v4 11/43] arm64: kvm: Allow passing machine type in KVM creation Date: Wed, 21 Aug 2024 16:38:12 +0100 Message-Id: <20240821153844.60084-12-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240821153844.60084-1-steven.price@arm.com> References: <20240821153844.60084-1-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 6f3b2c907c85..fb1ed1f44561 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -205,6 +205,23 @@ 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 2257a3b4fb06..4e6a1e39ceb3 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)) 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 b3884757739d..74f256eb07d2 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: */