From patchwork Tue Aug 20 13:18:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13770091 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 69704190670; Tue, 20 Aug 2024 13:18:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724159889; cv=none; b=BKlcgF3wrkl6LjbGfDqoM7mRXSEAgCqa5oZbwuEfuAyR7o2qI51l39vEt+NLtOj8fwenJQeblDAu+fxWTXziENa/G+wXOhj7nOBJbFdAqrk6SR/oqXupgVRad0oJhqD1AGz20FfrfaZpXAN1KehqLs3sOBlCEAt3RFEoM+nTaIM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724159889; c=relaxed/simple; bh=c3Z1JxPnPDc0JyvzdjgMda935deX6eK6ajc0Q+Qvets=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kYvtNClYsX0O2OOM6Us14077AqvqpSnlOWb2q0Ty1qK23LD07FkQW5HS9qC9u29THL96DOFPyrjm15+snieBlMFWxK4aAkHClUGeG8AX7ZwVb+W14J/KY2+7Bv/A0SZ1g2Tzb9EyK3HG1JPmE1KocgyKcS1xLttv6b6nxc7xub4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=U3oUGGqa; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="U3oUGGqa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05488C4AF0C; Tue, 20 Aug 2024 13:18:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724159889; bh=c3Z1JxPnPDc0JyvzdjgMda935deX6eK6ajc0Q+Qvets=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U3oUGGqa9JMkDJxqUXk/CcBrIuxgjMWcBc9qmIxU6Nq5JjKDLBW2+EJZ7F6OlZqMU 2F308LEUA0WiSLyqNVLEU+PChu0YG4v/lQRnDSwflYiEenxT0IRwfyT74z4ByryWWu aJH0kGPfDKz+unolps36LKFZc0sq4LULPAcQha6OLIgJPXh+s/fuWFACs8QEINbKsi UN/o1VDz9oPfx+PQNsENz30yircLteHmcei6fr2Ub304dB+V6rpweIoi+J3CaL8aQp wUHKOSD0sO5r8d3u+4hUSDaoLSvPD6SlehkquYq15kFIIDyviDjNyX5k8u0CZTq30S rP97TWzutFUiQ== 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 1sgOkR-005HMQ-6n; Tue, 20 Aug 2024 14:18:07 +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 v4 6/8] KVM: arm64: Expose ID_AA64FPFR0_EL1 as a writable ID reg Date: Tue, 20 Aug 2024 14:18:00 +0100 Message-Id: <20240820131802.3547589-7-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240820131802.3547589-1-maz@kernel.org> References: <20240820131802.3547589-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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),