From mboxrd@z Thu Jan 1 00:00:00 1970 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 AC9C133B6E9; Wed, 26 Nov 2025 16:00:01 +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=1764172801; cv=none; b=McQBDdosZo/v2WMfatg/oYdWDZDSgj08psAqEhh7oMNZhsB4p9cSgnt7DiL7lozQw8ov8vVq/g5I2xOPbtBCFstVHHRJPZlx5WQtdHRsIlCMSAP2UY7kpd/YpDjtdLqyKqmnY+e0kaxMgYcVZZamAO6XhE2Xv14G4+zvXrLT3xA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764172801; c=relaxed/simple; bh=+BV4THtYsQfcXI7IsOiiCra+PKb2lEDeuC2fbyHx94E=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=tgtmryyQULkia5RTD2wAmBYKStUswGMjEO+c2oG9x1q+DerrDLfrPocIN1QRnKESJxFc8PmvrfbeHiBAu/7Xllg58uFxEQG20+QXhN5JbZZpqnJ3S/RNNISfopcLyJIZWxBF0lyNqhPptyzMk93CAKTv+r0sEakMjI68+yNYTr8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YF9z44E5; 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="YF9z44E5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C936C116B1; Wed, 26 Nov 2025 16:00:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764172801; bh=+BV4THtYsQfcXI7IsOiiCra+PKb2lEDeuC2fbyHx94E=; h=From:To:Cc:Subject:Date:From; b=YF9z44E5JESLD5d1T4C1tdQX09Ei64wnllaj1pF7GgnSEPVlsMh75pmmVQ3tVA/Rg /q08fZDQTARboGe2lRON/sXRoPNXSl9rzgBpPdvl3Zc+sFtUtJyrdgeghOkG9e/Eeu Ao1s76QSGpGnryGXrPcZu5JGIszepPuKsoJ3llFP8jsZ0U8R1YFSE4vkpHKWIOO+sK ZKBFNTVwarwcwn/33LXaFnENMmh5/7BbQFaRzE1Hp2Mt4G2R8j1zk6OAUG+bmBRgZU FP+EfQPKbe/9uMvMtfmUu0ahsj+vGzY+LD5cPWqDzacJXdcITJWhiThMpEDS6PS7Vq f7azhSdV3moNw== 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 1vOHvy-00000008WrH-132B; Wed, 26 Nov 2025 15:59:58 +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 , Ben Horgan Subject: [PATCH v2 0/5] KVM: arm64: Add support for FEAT_IDST Date: Wed, 26 Nov 2025 15:59:46 +0000 Message-ID: <20251126155951.1146317-1-maz@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: 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, ben.horgan@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false 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. * From v1: [1] - Fixed commit message in patch #4 (Ben) - Collected RB, with thanks (Joey) [1] https://lore.kernel.org/r/20251120133202.2037803-1-maz@kernel.org 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