From patchwork Tue Aug 13 10:43:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13761769 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 6FB4CC52D7B for ; Tue, 13 Aug 2024 10:46:47 +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=URJQWGjrLamdTVhO4XCbEGmYL18Ca1QHFyRTUxqSDI4=; b=HSyGSmEftoR4zJTlm+3NKqEtlP d6Rqim73FdTC3WDOZ+df6XQz7jfrkZP03QTSwNRgoKmi7++Umc06t0CgVwHO7j3GFFbgURkY40mHY FbSFid1KPmPSpLRDi7522knYzif9GaSSBJooeVqnlK7uRuDYdk+3riB2GRS8Sab7zLfdC5rzotAFN yCcO1yeV3okve0lVnQDAP2/mbj7oDZ+hpthUiSBx+ytuLsZghaS6plis89NJILQtUSXDs61l4i4ye 7oBjanS7aUdkUs8uOQ6kBHDbAvKN+CmaBOBSFUZxqb7920BzYw+4byRFd/C8CAr0lXxBxJcTmafDx 5VcNRP2g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sdp30-00000003O41-3Iy4; Tue, 13 Aug 2024 10:46:38 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sdp0d-00000003NEl-3vRO for linux-arm-kernel@lists.infradead.org; Tue, 13 Aug 2024 10:44:14 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 2326A6163C; Tue, 13 Aug 2024 10:44:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF9BBC4AF16; Tue, 13 Aug 2024 10:44:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723545850; bh=c3Z1JxPnPDc0JyvzdjgMda935deX6eK6ajc0Q+Qvets=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nkyje5/5HfUnG64bziPwdwV9abferWbjpB7tSV0XfZpYuU14Zj622q4oxm7umZNQm JmMlwz8zzlDTR3iMGaw/mnwXb7kclEhKaniui92/xxRFTDAFAsU9J7BQfZHB6CB9Hi yuU6RIAJpj3fA/+I/MjsgIDTZg/8xYmF7dqhYAgJ6RGDEVwsKQqhR5aAAd72PblfHo zMPLoS6UdW2Mmr9KTWiR9Hid/KGjfo5fWNeaYG46qAd1+TCHzYGuBrWogUOw8BKCx3 eTYk7Wx01jyb+NOlcNcOUFjR7G1U2hPHJsmD4xtCN7v59yAgZsn0FefVnAaOXmJ/wa pKGsNAKZM50XQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1sdp0b-003JD1-43; Tue, 13 Aug 2024 11:44:09 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Joey Gouly , Mark Brown Subject: [PATCH v3 6/8] KVM: arm64: Expose ID_AA64FPFR0_EL1 as a writable ID reg Date: Tue, 13 Aug 2024 11:43:58 +0100 Message-Id: <20240813104400.1956132-7-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240813104400.1956132-1-maz@kernel.org> References: <20240813104400.1956132-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com, tabba@google.com, joey.gouly@arm.com, broonie@kernel.org 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-20240813_034412_072844_BD8D7015 X-CRM114-Status: GOOD ( 12.73 ) 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 ID_AA64FPFR0_EL1 contains all sort of bits that contain a description of which FP8 subfeatures are implemented. We don't really care about them, so let's just expose that register and allow userspace to disable subfeatures at will. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/sys_regs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 79d67f19130d..4c2f7c0af537 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2386,7 +2386,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), ID_HIDDEN(ID_AA64SMFR0_EL1), ID_UNALLOCATED(4,6), - ID_UNALLOCATED(4,7), + ID_WRITABLE(ID_AA64FPFR0_EL1, ~ID_AA64FPFR0_EL1_RES0), /* CRm=5 */ { SYS_DESC(SYS_ID_AA64DFR0_EL1),