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 62A42CF65E7 for ; Mon, 26 Jan 2026 12:17:55 +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: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:In-Reply-To:References:List-Owner; bh=N1MTMacPrjgv5Jfh+zveGyXFfX4XsD0MwqFQwkQwE+w=; b=ZQRMN/ZKO8jgAhIvDOloVslA4X dltzQ83r9eHgxe4H5/5ySMGfvHni4+Gslw0bskE9ktgBSzsYG20iRDFPdvtCDGUTGL2S4Yd/p1XQ3 BjiMq8bYOqXeN4CqN9FZkWK+IEibvA3zHivobdzV/u8y7AGa3HY5aOCmFXc4XPeRC+Tf3DxSI01E+ f4mreqO4pmaW4Dm0pv1QqmO7A7K988vsYyO5t/e8ayP0RJCEZ1KrBHyzc6V6XxCxOlUtZ7dIaJr3w fVvvo1q56wZGwQLgVuHjosJ1wUQQ3FLR8c9WP2bpeWmt5oP5IsAVYGuV4QrxQvcTUNtKZ3M6O+T9q I3OX75Hw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkLXR-0000000CV0V-0deP; Mon, 26 Jan 2026 12:17:49 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vkLXD-0000000CUqz-0Wnp for linux-arm-kernel@lists.infradead.org; Mon, 26 Jan 2026 12:17:37 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 064E044202; Mon, 26 Jan 2026 12:17:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1C87C19422; Mon, 26 Jan 2026 12:17:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769429853; bh=uc5X5aKabC+jCw4M1h0zdw2/00NHc+cDLz/jTFu+bto=; h=From:To:Cc:Subject:Date:From; b=azV2pcb36iRUs7IUKxkq3qU4RgLIqeHxfaQhDga1WIrF550NnLHv9AbgFlLynA20c 7uM0PuXkGrohnpB8g2Y/uHLdtW4ZeIyJQLIo0XPsAHRoJiX46hELd1HyA0kCE1uLms stnJ4fkdKEcgvdxyrbe5zZdkWsO6CrTdg4BOrkpQCeAbV3Bg6QRtfN76MCUY+tqxuK o8PDmGB5R8ZFbnkEpNhBqzcGfYpdbXtmc4Y5EENLCMVjlFp44nVdT1Ro+7SZEcc4xc gIyvwBNZx2DLCQ0ybb7gxkH6OPSprIQ0ayuCT51XMg8fXB4bQIkRzWhJNyFmlBtrDz U8WHYCoWclOeQ== 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 4.98.2) (envelope-from ) id 1vkLX9-00000005hx6-2B8p; Mon, 26 Jan 2026 12:17:31 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Will Deacon , Catalin Marinas Subject: [PATCH 00/20] KVM: arm64: Generalise RESx handling Date: Mon, 26 Jan 2026 12:16:34 +0000 Message-ID: <20260126121655.1641736-1-maz@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, tabba@google.com, will@kernel.org, catalin.marinas@arm.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-20260126_041735_203431_57A471CE X-CRM114-Status: GOOD ( 13.02 ) 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 Having spent some time dealing with some dark corners of the architecture, I have realised that our RESx handling is a bit patchy. Specially when it comes to RES1 bits, which are not clearly defined in config.c, and rely on band-aids such as FIXED_VALUE. This series takes the excuse of adding SCTLR_EL2 sanitisation to bite the bullet and pursue several goals: - clearly define bits that are RES1 when a feature is absent - have a unified data structure to manage both RES0 and RES1 bits - deal with the annoying complexity of some features being conditioned on E2H==1 - allow a single bit to take different RESx values depending on the value of E2H This allows quite a bit of cleanup, including the total removal of the FIXED_VALUE horror, which was always a bizarre construct. We also get a new debugfs file to introspect the RESx settings for a given guest. Overall, this lowers the complexity of expressing the configuration constraints, for very little code (most of the extra lines are introduced by the debugfs stuff, and SCTLR_EL2 being added to the sysreg file). Patches on top of my kvm-arm64/vtcr branch (which is currently simmering in -next). Marc Zyngier (20): arm64: Convert SCTLR_EL2 to sysreg infrastructure KVM: arm64: Remove duplicate configuration for SCTLR_EL1.{EE,E0E} KVM: arm64: Introduce standalone FGU computing primitive KVM: arm64: Introduce data structure tracking both RES0 and RES1 bits KVM: arm64: Extend unified RESx handling to runtime sanitisation KVM: arm64: Inherit RESx bits from FGT register descriptors KVM: arm64: Allow RES1 bits to be inferred from configuration KVM: arm64: Correctly handle SCTLR_EL1 RES1 bits for unsupported features KVM: arm64: Convert HCR_EL2.RW to AS_RES1 KVM: arm64: Simplify FIXED_VALUE handling KVM: arm64: Add REQUIRES_E2H1 constraint as configuration flags KVM: arm64: Add RESx_WHEN_E2Hx constraints as configuration flags KVM: arm64: Move RESx into individual register descriptors KVM: arm64: Simplify handling of HCR_EL2.E2H RESx KVM: arm64: Get rid of FIXED_VALUE altogether KVM: arm64: Simplify handling of full register invalid constraint KVM: arm64: Remove all traces of FEAT_TME KVM: arm64: Remove all traces of HCR_EL2.MIOCNCE KVM: arm64: Add sanitisation to SCTLR_EL2 KVM: arm64: Add debugfs file dumping computed RESx values arch/arm64/include/asm/kvm_host.h | 33 +- arch/arm64/include/asm/sysreg.h | 7 - arch/arm64/kvm/config.c | 430 ++++++++++-------- arch/arm64/kvm/emulate-nested.c | 10 +- arch/arm64/kvm/nested.c | 151 +++--- arch/arm64/kvm/sys_regs.c | 98 ++++ arch/arm64/tools/sysreg | 82 +++- tools/arch/arm64/include/asm/sysreg.h | 6 - tools/perf/Documentation/perf-arm-spe.txt | 1 - .../testing/selftests/kvm/arm64/set_id_regs.c | 1 - 10 files changed, 510 insertions(+), 309 deletions(-) -- 2.47.3