From mboxrd@z Thu Jan 1 00:00:00 1970 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 351A7C636D4 for ; Mon, 13 Feb 2023 16:36:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ySex9Dil+xcA+QUm3k61UYV2FzZMlaU6XVd3LPftKFw=; b=kFDpjubTld5+cA uhHGlrpvfYD0Kmv/JcWaybSOA3/vpHQg+HgiPXo5slnXPHYWlHWdKXrH8/Fxsic51qz7iR3V7Dg+D O0Pv/49lHVLI3YA433spmkQ9MNYKYXzpBIzlL8zB0YSnnZld8qtCZNUN32Z1bnJuRVO9gj73tIsrF dBrhfAJB82w7KstlR/O1YzxRGHKohyIOqo2/eTpdCC8lI5IuMvf3tPkjc0Qu4aTmaW3B8cGBhXOls mv6Lh8f1Z6GTtNYtlqjw8fGKU3eahjoj0eA0kXl3E0FK9g0rVazF2ZgeWvq92MuAr33xD828tYHv3 pYV7QuZDwwuvQEh7hg9g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pRbns-00FVLm-I9; Mon, 13 Feb 2023 16:35:44 +0000 Received: from mail-io1-xd30.google.com ([2607:f8b0:4864:20::d30]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pRbnn-00FVKT-3w for linux-arm-kernel@lists.infradead.org; Mon, 13 Feb 2023 16:35:42 +0000 Received: by mail-io1-xd30.google.com with SMTP id l128so4659000iof.2 for ; Mon, 13 Feb 2023 08:35:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1676306136; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=2rlnKFgrRUm8Uq6241EeorSyjCYr9c9HFlGFvXdOyL8=; b=pwEvTbpuPD909QsbFce8wQK8GLxAqY/YRJ8l5yTI2LF1etbDxBJyppNy1pw3sccpMT V/hOgCwIYM24FniVQ3CFzjUAQczUHEZS/y/O/cG6gtnPs5aSOCNiUnpISn6jHLMt3av8 UACyMYfr25ionq5s0vVIHsFkKSb/5mxhx/FDrQClY4po/ISPFHwrr+7VpWuXkDmRfg8E Kl+bVUQ9A5mxRhQveagrtS9J5Xexml9HYe3uEVQFQUUos0sJFLWTtBUa6H4qkml0YroF prnTaAGzt9AKzQcMQbv++KTD7xkPmuNIK5G/pKJIhAlOPXRSY5Rgj9YAL+D9MCyNHQ1o WvPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1676306136; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2rlnKFgrRUm8Uq6241EeorSyjCYr9c9HFlGFvXdOyL8=; b=JCsqIikOXo1/ZovyjzaItmTnDcLfg05LKl014XgpuhgQbgJagvzcLob/Kx7N3uZ4Nk g5NUsJ++64oUUGv06GysmyZ3YCbiS74Kn1aAL7jEb54/mEEnONXnNTr8u7nhdIMWb8Ly VgXSmdCgPJoDMy4AIPzaUjcXJZW6zBtvvZ1V8UksNVzR513QbhrD4K4mL8Cuxyq33c53 e/tCjAnusLYlWGs/Ary86r+6f/uKFs7T7V1obdIOeVM59qFknSs653tqCtCXdTYbLQWu kvXXm4UTIU8CeXrfD5aDhR1LCT6ar07xYHIS5e1ZctdB8qlRhvYmNsTcStqTDaU31iat dVfg== X-Gm-Message-State: AO0yUKWLvnHhKOM3V/eXZDORwjvfeuK6Uick1ECmDD2pCwk8K4k5/cJX uMXl4anWIiwA6SQTtm2rtU8= X-Google-Smtp-Source: AK7set8mRhRxVIVEf9OHVXJ6AT7dvTcgh2wGFkhbQuyPdTKuJ72bGM96bYuK7fsFHHVXsPTbWCfkQA== X-Received: by 2002:a6b:7d4c:0:b0:715:f031:a7f5 with SMTP id d12-20020a6b7d4c000000b00715f031a7f5mr16953693ioq.1.1676306136640; Mon, 13 Feb 2023 08:35:36 -0800 (PST) Received: from localhost (88-115-161-74.elisa-laajakaista.fi. [88.115.161.74]) by smtp.gmail.com with ESMTPSA id g5-20020a02c545000000b0038a6ae38ceasm4206262jaj.26.2023.02.13.08.35.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Feb 2023 08:35:36 -0800 (PST) Date: Mon, 13 Feb 2023 18:35:30 +0200 From: Zhi Wang To: Steven Price Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, 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 Subject: Re: [RFC PATCH 07/28] arm64: kvm: Allow passing machine type in KVM creation Message-ID: <20230213183530.00006d35@gmail.com> In-Reply-To: <20230127112932.38045-8-steven.price@arm.com> References: <20230127112248.136810-1-suzuki.poulose@arm.com> <20230127112932.38045-1-steven.price@arm.com> <20230127112932.38045-8-steven.price@arm.com> X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230213_083541_377412_BCB41F6C X-CRM114-Status: GOOD ( 25.06 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 27 Jan 2023 11:29:11 +0000 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. > > Signed-off-by: Steven Price > --- > arch/arm64/kvm/arm.c | 13 +++++++++++++ > arch/arm64/kvm/mmu.c | 3 --- > arch/arm64/kvm/reset.c | 3 --- > include/uapi/linux/kvm.h | 19 +++++++++++++++---- > 4 files changed, 28 insertions(+), 10 deletions(-) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index 50f54a63732a..badd775547b8 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -147,6 +147,19 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) > { > int ret; > > + 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; It is better to let this call fail when !kvm_rme_is_available? It is strange to be able to create a VM with REALM type in a system doesn't support RME. > + break; > + default: > + return -EINVAL; > + } > + > ret = kvm_share_hyp(kvm, kvm + 1); > if (ret) > return ret; > diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c > index d0f707767d05..22c00274884a 100644 > --- a/arch/arm64/kvm/mmu.c > +++ b/arch/arm64/kvm/mmu.c > @@ -709,9 +709,6 @@ int kvm_init_stage2_mmu(struct kvm *kvm, struct kvm_s2_mmu *mmu, unsigned long t > u64 mmfr0, mmfr1; > u32 phys_shift; > > - 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/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c > index c165df174737..9e71d69e051f 100644 > --- a/arch/arm64/kvm/reset.c > +++ b/arch/arm64/kvm/reset.c > @@ -405,9 +405,6 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type) > 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 (phys_shift) { > if (phys_shift > ipa_limit || > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index fec1909e8b73..bcfc4d58dc19 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -898,14 +898,25 @@ struct kvm_ppc_resize_hpt { > #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: > */ _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel