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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86B7EC433FE for ; Tue, 12 Oct 2021 04:36:47 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 3DB79610C7 for ; Tue, 12 Oct 2021 04:36:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 3DB79610C7 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E43A54B091; Tue, 12 Oct 2021 00:36:46 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8VDY65H72ydl; Tue, 12 Oct 2021 00:36:45 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 60F7A4B0D9; Tue, 12 Oct 2021 00:36:45 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4F2AB4B0CB for ; Tue, 12 Oct 2021 00:36:44 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mu97AgKPrFSH for ; Tue, 12 Oct 2021 00:36:43 -0400 (EDT) Received: from mail-qv1-f74.google.com (mail-qv1-f74.google.com [209.85.219.74]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id EC3DD4ACC9 for ; Tue, 12 Oct 2021 00:36:42 -0400 (EDT) Received: by mail-qv1-f74.google.com with SMTP id gw8-20020a0562140f0800b0038366347de1so5554833qvb.16 for ; Mon, 11 Oct 2021 21:36:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=W3IwbsI0k+1QwX+TAHKvccKyulobDPeUG2CVSppLk2E=; b=TfiizDughOv6XpmrE/B/ta2oJtWh1KOl7oRghEckpq0jtU04giMWrFXne9m7+dzkv6 +vDn6LO6SZHnG6Q2pROAG2PQBSDXREyd22lMQG+lxRGsSADq1E+VnO1Z7WqkDHfrJlNO EVH0Yg/uVDi2saPJf04+wIlOaX6lLvVlRsChENQhZNP7PXPXCNlE+6otUV3bnagcPn4z Yx6SBV7yyfslru2sqW6hIZHTINV96lf4W7ad0FwkZXwvoj8/k7dfbQXIV11HMFzC35M9 3BWa+zuJL4S/hTBSHGuyaF8QFy7mPEwc4ITx69ZWKUdntSI1EIJBbI4KYAjAoqtTxm/c HEOw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=W3IwbsI0k+1QwX+TAHKvccKyulobDPeUG2CVSppLk2E=; b=jiswkBC05hGJRTdps3d/GMA/tDAGcOgqtz5STLWi8OzlmnciSbHmtCRLHj91R46nGq jVpcli0QhRTPZ+mCH3vhsRgnm7AVtoWI7A/Ddb1IHlC6jlQj6Fp/K1CNkp34ssB6ypcS VsMyxxzCOnl/yp+FOQsP3uS7Oq7Xu8kc77dIfOut0dw62bjDoz7rEphapE+6pexllXC4 T/ngVrxoOvvA+1Yx5h0R/yE80g1AO4YSOyliQtyAoH1ORlbund8eomVoGyNZN0hXgdLL wLegzun/l++yuGnGYExa7095Dh4KKCr5IdUnFT4cVAfrcgtAlDNoljTst0ZU2tPt4DXP gP4g== X-Gm-Message-State: AOAM530hhNFh1wBcJ60eHlRyIXz0YVD7Opv3tuuwSqwPKuwaFh8UKxog T3pERK1C2wdM2DqNYVPvykDZwUpFEYg= X-Google-Smtp-Source: ABdhPJzqRlxJ4C5xz9JQufFpuXIYDJjLzFExk6TNCvlIXorPpPAh6QasGboxtVmBj45EPB8PnMerC+dbHno= X-Received: from reiji-vws.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:15a3]) (user=reijiw job=sendgmr) by 2002:a05:622a:1a0b:: with SMTP id f11mr12653018qtb.133.1634013402619; Mon, 11 Oct 2021 21:36:42 -0700 (PDT) Date: Mon, 11 Oct 2021 21:35:25 -0700 In-Reply-To: <20211012043535.500493-1-reijiw@google.com> Message-Id: <20211012043535.500493-16-reijiw@google.com> Mime-Version: 1.0 References: <20211012043535.500493-1-reijiw@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [RFC PATCH 15/25] KVM: arm64: Introduce KVM_CAP_ARM_ID_REG_WRITABLE capability From: Reiji Watanabe To: Marc Zyngier , kvmarm@lists.cs.columbia.edu Cc: kvm@vger.kernel.org, Will Deacon , Peter Shier , Paolo Bonzini , linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Introduce a new capability KVM_CAP_ARM_ID_REG_WRITABLE to indicate that ID registers are writable by userspace. Signed-off-by: Reiji Watanabe --- Documentation/virt/kvm/api.rst | 8 ++++++++ arch/arm64/kvm/arm.c | 1 + include/uapi/linux/kvm.h | 1 + 3 files changed, 10 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a6729c8cf063..f7dfb5127310 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -7265,3 +7265,11 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace the hypercalls whose corresponding bit is in the argument, and return ENOSYS for the others. + +8.35 KVM_CAP_ARM_ID_REG_WRITABLE +-------------------------------- + +:Architectures: arm64 + +This capability indicates that userspace can modify the ID registers +via KVM_SET_ONE_REG ioctl. diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 820f35051d77..29c13a32dd21 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -197,6 +197,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_VCPU_ATTRIBUTES: case KVM_CAP_PTP_KVM: + case KVM_CAP_ARM_ID_REG_WRITABLE: r = 1; break; case KVM_CAP_SET_GUEST_DEBUG2: diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index a067410ebea5..3345a57f05a6 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1112,6 +1112,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_BINARY_STATS_FD 203 #define KVM_CAP_EXIT_ON_EMULATION_FAILURE 204 #define KVM_CAP_ARM_MTE 205 +#define KVM_CAP_ARM_ID_REG_WRITABLE 206 #ifdef KVM_CAP_IRQ_ROUTING -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm