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 9CDA5CF8856 for ; Thu, 20 Nov 2025 13:32:36 +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=rqbCRwLVsNscBBxZnTO/PnT32DqxwyuxhxzUHdQcc7E=; b=1vluSmizX/CnJIP3U1zSrEAA61 qaLIWCDlk7RBESPEU2/9ScMexUV4prifsk/cTfv1Vnwdl553Njhd+6kIqGDu7y27FsU6o42vyu2CD GmlBhfQFb89s4KDSIslNexUvTEHQVgfb2eJcAHoPkluDgHY176ygh4yIRmE8Z3Xx9mrQBTYJY81hx atn7OSYbAyuc1qT5Ur2Zn2mh6mcNeFcrBneS46JjGWsys2AhSmpxf3FVlnG5qw1elXXZBPFUrUq44 VOppU+Yz3SdGrJ+B6Q+DthvvxQrr4VXgYT5i4c/KGry0/dFpfC8kD7BClbyBjXtWW1a4v5+zPsD3f pt1vWcOA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vM4lz-00000006jXe-18cR; Thu, 20 Nov 2025 13:32:31 +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 1vM4lp-00000006jUH-0vI4 for linux-arm-kernel@lists.infradead.org; Thu, 20 Nov 2025 13:32:22 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 2C5314436D; Thu, 20 Nov 2025 13:32:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 02CB0C4CEF1; Thu, 20 Nov 2025 13:32:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763645540; bh=weqSIwlp3xIIHPIv7fkV+2kNuL/A0SzWqeYwqZ5jLi8=; h=From:To:Cc:Subject:Date:From; b=dwZgB7CvdEkFocHnkkkxHfssM84KVXbUrqRzwJB1NVp/V/keQLLD+LHdAgN/KNlz3 B0k9IWy4v7v5ERWdMvWaEu2c+lzN5HOTzOeaA+spGcFcO8rb7hN6MJZ6UMH89ovZHo /cLmv51TPJXDLk3nf5RaMYchzMFeIfKTWYLz4iNMOAJKXWSNyyZd3RkKfv4N0nHnHV 4DlsnoQJZ80fBTTgYFds4dFcLqcc7V/esF0p+cuwrz4lUQdMY98YFWcH4lfVUhApwX OWRALzFH6j7CraDI7+yPYM7t7QhWSQjn3TquzZJZcWbT1fRU57Rgtx+UpeYdgP0ip4 6PC4eDdRAaLZA== 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 1vM4ll-00000006tUG-2khI; Thu, 20 Nov 2025 13:32:17 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH 0/5] KVM: arm64: Add support for FEAT_IDST Date: Thu, 20 Nov 2025 13:31:57 +0000 Message-ID: <20251120133202.2037803-1-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, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, 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-20251120_053221_279956_6BBDBC4C X-CRM114-Status: GOOD ( 12.60 ) 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 FEAT_IDST appeared in ARMv8.4, and allows ID registers to be trapped if they are not implemented. This only concerns 3 registers (GMID_EL1, CCSIDR2_EL1 and SMIDR_EL1), which are part of features that may not be exposed to the guest even if present on the host. For these registers, the HW should report them with EC=0x18, even if the feature isn't implemented. Add support for this feature by handling these registers in a specific way and implementing GMID_EL1 support in the process. A very basic selftest checks that these registers behave as expected. Marc Zyngier (5): KVM: arm64: Add routing/handling for GMID_EL1 KVM: arm64: Force trap of GMID_EL1 when the guest doesn't have MTE KVM: arm64: Add a generic synchronous exception injection primitive KVM: arm64: Report optional ID register traps with a 0x18 syndrome KVM: arm64: selftests: Add a test for FEAT_IDST arch/arm64/include/asm/kvm_emulate.h | 1 + arch/arm64/kvm/emulate-nested.c | 8 ++ arch/arm64/kvm/inject_fault.c | 10 +- arch/arm64/kvm/sys_regs.c | 17 ++- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/arm64/idreg-idst.c | 117 ++++++++++++++++++ 6 files changed, 149 insertions(+), 5 deletions(-) create mode 100644 tools/testing/selftests/kvm/arm64/idreg-idst.c -- 2.47.3