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 X-Spam-Level: X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B516CC433DB for ; Wed, 6 Jan 2021 17:24:45 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 74A8F23125 for ; Wed, 6 Jan 2021 17:24:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 74A8F23125 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=m9B8OCV1Dwr9h8Uv0DZ9SaXvqGmLznN4xVwcAex0hS8=; b=tZhAvCKTC4qZYloQ+reo3ul56C GLikcg9wos+L6hg3OuE/sLL3g0kydrsfsniFZxPeJLpNMyIjlxx03KDVd98Ivwtm04ZBWvTHgz4Ix izZmqQNBxKWxTEVObvt/EzQ9FL9ZIoH7JNFMvBTxxACEA/oPtv3++NOqoAMC8LAP01UFgpBHH5k/4 0XYPl0FEe2lIBgb52FU80efCKJOoQ2xLwndO7xsI1g41QGHQvAdMPuLsqiznFFXPEmUKSOXlxwll+ Jz8QvdKcC93TiusioZRrGHdUBMfgaHIyOQXLltMi0B39xu5STwcvJBU/c+gRQvsUMuipDw5375qrc OO9tkMAA==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kxCWV-0002JE-7a; Wed, 06 Jan 2021 17:23:03 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kxCWR-0002IE-Mh for linux-arm-kernel@lists.infradead.org; Wed, 06 Jan 2021 17:23:00 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 17199222F9; Wed, 6 Jan 2021 17:22:59 +0000 (UTC) Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94) (envelope-from ) id 1kxCWK-005g7y-B5; Wed, 06 Jan 2021 17:22:52 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH 0/2] KVM: arm64: Hide absent PMU registers from userspace Date: Wed, 6 Jan 2021 17:22:26 +0000 Message-Id: <20210106172228.2289695-1-maz@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, drjones@redhat.com, eric.auger@redhat.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210106_122259_822322_90809D7A X-CRM114-Status: GOOD ( 11.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrew Jones , Suzuki K Poulose , kernel-team@android.com, Eric Auger , James Morse , Alexandru Elisei , Julien Thierry 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 We're now able to hide PMU registers from the guest when no PMU is available, but I just realised that we don't do the same thing for userspace, which is pretty annoying (as it ends up with garbage). The first patch introduces a visibility callback for all PMU regs, which applies to both guest and userspace. That's what I should have done the first place. The second patch is only a cleanup, now that we are doing the right thing. This is a potential fix for 5.11, so shout if you spot something! Thanks, M. Marc Zyngier (2): KVM: arm64: Hide PMU registers from userspace when not available KVM: arm64: Simplify handling of absent PMU system registers arch/arm64/kvm/sys_regs.c | 76 +++++++++++++++++++++++++-------------- 1 file changed, 49 insertions(+), 27 deletions(-) -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel