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 2F3F2C433EF for ; Wed, 3 Nov 2021 06:28:31 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id D57486117A for ; Wed, 3 Nov 2021 06:28:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D57486117A 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 833014B14C; Wed, 3 Nov 2021 02:28:30 -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 t6z6TubdhPMT; Wed, 3 Nov 2021 02:28:29 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id A5E5B4B195; Wed, 3 Nov 2021 02:28:27 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 7A8DA4B15A for ; Wed, 3 Nov 2021 02:28:26 -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 Ob3NBGfpUkQn for ; Wed, 3 Nov 2021 02:28:25 -0400 (EDT) Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 54C014B091 for ; Wed, 3 Nov 2021 02:28:25 -0400 (EDT) Received: by mail-pl1-f202.google.com with SMTP id k9-20020a170902c40900b001421e921ccaso159481plk.22 for ; Tue, 02 Nov 2021 23:28:25 -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=LPEo6E0odusyrNggBByLPHmUhPl/zAKGlEQeNEdskuA=; b=bUNM+pxcYjjNldjizqCPZrdfmrJ570sn9wZ2+V56DnjdvPvtesjhdX/PSW+VQDoFfO 4yc25e1h0xFAlZIhbOGpVQZrhoK267T/BxRH6QH3HLqV/1XTLHt0bmLoDFG2mBLwR2n5 4qjERrwJ999xwEgl++TYoXgA9t9wDvO8RsuGQMJaJ5XEvCaVXN3vs4Fn3idvHHMy8lzJ eIuynnNTqqXtqERgV/dwYp/hbLg3cZOLT2Hz/eodY1pJ69D1yTMVzvEJPhuK+3Cgtg/n 7U3CmnMjBBgBG4VlAeldkwlh/C5NaaZXwcCDPKbztqhLXOUTFjDOyPzZXSoH329hztzx 1ZYg== 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=LPEo6E0odusyrNggBByLPHmUhPl/zAKGlEQeNEdskuA=; b=5UeLpyIHyUy4l8HTJvOWFufFKNnsWu3zGyhU1Lt7U5rh1nAZxtaBZkXFW1EWKK9k+M OvsuHl0CgrIQaoQzAoaWFLkqPBYC3nZdGlQQAw5LICeL0hSA1OUIelTynqNk0MxWxN5p khFPSZ2CoEaKrEgVS5TgSUqhZZKrebIRnK8mr147I+jxwHclxvg00iC5XskPNzcp8piS Fp3LND94WTqpIahwzhPVmxNw9zDEJmhI5M+UIa/pAQkKXCrVvrNVHx9ZNiORZLJm35+2 rj8mcLz8TEA1mHmRJYumtFM+qWiEv0kCgJjX3AigvPIdVyeD3Jz8a1AbH1wf0Hvy8BLN 9u6g== X-Gm-Message-State: AOAM5331heq2yzzUJjNqvQUJL/hVINfiPk2LgTnsxUsUte23NH41joUS aR0IFLpTzCq6Rt/uAVohIa8YSdVX2tw= X-Google-Smtp-Source: ABdhPJxPQlTZgemwz/ej9COOHQof1/L/+yDn2lMn62bmlzOf2+lYhTzbKkH4dxYFVrp4EA9bFyTluvTF1D0= X-Received: from reiji-vws-sp.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3d59]) (user=reijiw job=sendgmr) by 2002:a62:1904:0:b0:480:816c:1d3e with SMTP id 4-20020a621904000000b00480816c1d3emr27606490pfz.83.1635920904536; Tue, 02 Nov 2021 23:28:24 -0700 (PDT) Date: Tue, 2 Nov 2021 23:25:10 -0700 In-Reply-To: <20211103062520.1445832-1-reijiw@google.com> Message-Id: <20211103062520.1445832-19-reijiw@google.com> Mime-Version: 1.0 References: <20211103062520.1445832-1-reijiw@google.com> X-Mailer: git-send-email 2.33.1.1089.g2158813163f-goog Subject: [RFC PATCH v2 18/28] 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 528058920b64..87b8432f5719 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 -- 2.33.1.1089.g2158813163f-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm