From patchwork Fri Oct 4 15:27:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13822794 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EFBCBCF884E for ; Fri, 4 Oct 2024 17:08:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=cGCAQQwb5t9XHNthmZyUMPVnHpncjL1pehWgQplpgW4=; b=G4MchlOePB7Ex/Hde/ShSIthVS QLjfu4rKqQ3dxTFFLF6YJkThF33ga9L7N7jTvbQKnRgYuXTIO06PcysjYyH8EuKKvi9GKoZob5yMy rYAlsv1MZGDLPkkg2ACEmdCLX03I/u8Ya7uwleIO3imSxV4kcubYMM5k5slF+9W4qcwUHC0aNBdYX ASRyLZU0oTmXXEhsWT2wBXquGcwPp+XltfVIKXX2k+HmexDNbM4FUvSy2KiQCd0EfSUu+N1+9+tiF 7UTrmKBKORNDKUaScMXS2G/JG82kVZthtI+lkHqmh0tfW6UvE1wjugpyCs2a0OhAivS99ErSeF6qU CZVxHppA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1swlmc-0000000DOL4-3pBv; Fri, 04 Oct 2024 17:08:02 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1swkEv-0000000CzwL-1C5f for linux-arm-kernel@lists.infradead.org; Fri, 04 Oct 2024 15:29:10 +0000 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 E6D37339; Fri, 4 Oct 2024 08:29:37 -0700 (PDT) Received: from e122027.cambridge.arm.com (unknown [10.1.25.25]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E35213F640; Fri, 4 Oct 2024 08:29:03 -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 , "Aneesh Kumar K . V" Subject: [PATCH v5 11/43] arm64: kvm: Allow passing machine type in KVM creation Date: Fri, 4 Oct 2024 16:27:32 +0100 Message-Id: <20241004152804.72508-12-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241004152804.72508-1-steven.price@arm.com> References: <20241004152804.72508-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241004_082909_439345_7DAD5A2A X-CRM114-Status: GOOD ( 14.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 bb7843349f5a..d16ba8d8bc44 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -208,6 +208,23 @@ 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 e01faf72021d..d4ef6dcf8eb7 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: */