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 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 C5184C4167B for ; Mon, 13 Nov 2023 17:44:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :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=tusR1DSPfXrkYJK/7il/lb6YKot+w6bQnd6b1Aceaj0=; b=pCxVpjgS/8xIBP jwF1jAmoieqqfPXsLItE58+QGWELcIsJl3+f6cnyh0uGL3xG7Tg7Pp8KLhcMWOsATnpMCHtuqR5S4 r1GYkRyZLy7H+mJDcpidfi22Zb21mfzvZ7sEN1KdifF7H01CdXc4UbCEs1RsPYWJLG2EnvpWG3y0O lH8i2f31TED//kb0BjnsFnrjvztW/L5iZfH4O+3RFtgXUxhFYXbH59QE0QyVLyoyLPs4xdD2WYVJi hOKHt2itZe+pRWpn3imLIMZ4hWG6yQNzmfzqXj/EJdv1O1crksGvsEK4TpynxFLZl8Vk9TD2mal7o jmhTpceqHqJ+8HS4fuYQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r2ayg-00EQDY-2v; Mon, 13 Nov 2023 17:44:02 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r2ayS-00EPyt-1k for linux-arm-kernel@lists.infradead.org; Mon, 13 Nov 2023 17:43:51 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by ams.source.kernel.org (Postfix) with ESMTP id E6506B80EBE; Mon, 13 Nov 2023 17:43:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49390C433C8; Mon, 13 Nov 2023 17:43:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699897424; bh=LZot5LSLKGFVViUkzTbvPTqxVYnoVhynEFbi3MG5bh4=; h=From:To:Cc:Subject:Date:From; b=WsyVobhVKnOB58EtnEkk4bQ1P8KaProQABFa9I+QovXTY9bDQJpZwIYFdh6pm/pOe QnC89GSG6b0ejw79cSzxzvwPKJsdbQPx+fDjy5zMkc+AWIFactlsszVyZ8Vp/FIrjk Xb0hXEJkZZJTaR0i/vZkZl5hEXRuwImwDAvETKk7iWQaE3DNqqZj71RXHV0SimZodl OnBgqf9RbFWtPbtBkf7lzRMB+oZnStc2qi3R0/bZ4YqcT7ADCNE0brfb95lCQ2vxfz dPFjc9b1nd7OYnPgZ5wNcEpUZFh+WrOi1lSMpe/oT649V0SimFEZxZFdvp8mrtC70y 2yNcDaRDZp+jQ== 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 1r2ayK-00CkQ4-WE; Mon, 13 Nov 2023 17:43:41 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Will Deacon , Mark Rutland , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH 00/12] arm64: Add support for FEAT_E2H0, or lack thereof Date: Mon, 13 Nov 2023 17:42:32 +0000 Message-Id: <20231113174244.3026520-1-maz@kernel.org> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.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-20231113_094348_878629_71EB1B80 X-CRM114-Status: GOOD ( 11.31 ) 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: , 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 Since ARMv8.1, the architecture has grown the VHE feature, which makes EL2 a superset of EL1. With ARMv9.5 (and retroactively allowed from ARMv8.1), the architecture allows implementations to have VHE as the *only* implemented behaviour, meaning that HCR_EL2.E2H can be implemented as RES1. As a follow-up, HCR_EL2.NV1 can also be implemented as RES0, making the VHE-ness of the architecture recursive. This has a number of consequences, both at boot time and for KVM, though the changes at that level are pretty minor. The real meat of this series is on the cpufeature front, as FEAT_E2H0 is a *negative* feature, where 0b1111 (-1) represents E2H being RES1 and 0b1110 (-2) additionally indicates that NV1 is RES0. Fun, isn't it? As a bonus, a popular crop of non-compliant HW gets promoted as the first batch of non-zero E2H0 users, making things easy for KVM. This series is a prefix for the next drop of NV support. Marc Zyngier (12): arm64: cpufeatures: Correctly handle signed values arm64: cpufeature: Correctly display signed override values arm64: sysreg: Add layout for ID_AA64MMFR4_EL1 arm64: cpufeature: Add ID_AA64MMFR4_EL1 handling arm64: cpufeature: Detect E2H0 not being implemented arm64: cpufeature: Detect HCR_EL2.NV1 being RES0 arm64: Treat HCR_EL2.E2H as RES1 when ID_AA64MMFR4_EL1.E2H0 is non-zero arm64: Add override for ID_AA64MMFR4_EL1.E2H0 arm64: Add MIDR-based override infrastructure arm64: Add MIDR-based overrides for ID_AA64MMFR4_EL1.E2H0 KVM: arm64: Expose ID_AA64MMFR4_EL1 to guests KVM: arm64: Force guest's HCR_EL2.E2H RES1 when NV1 is not implemented arch/arm64/include/asm/cpu.h | 1 + arch/arm64/include/asm/cpufeature.h | 2 + arch/arm64/include/asm/kvm_emulate.h | 3 +- arch/arm64/kernel/cpufeature.c | 92 +++++++++++++++++++++++++--- arch/arm64/kernel/cpuinfo.c | 1 + arch/arm64/kernel/head.S | 25 +++++--- arch/arm64/kernel/idreg-override.c | 65 ++++++++++++++++++++ arch/arm64/kvm/nested.c | 4 ++ arch/arm64/kvm/sys_regs.c | 14 ++++- arch/arm64/tools/cpucaps | 2 + arch/arm64/tools/sysreg | 37 +++++++++++ 11 files changed, 225 insertions(+), 21 deletions(-) -- 2.39.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel