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 C4D54C43602 for ; Mon, 6 Jul 2026 10:00:26 +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=SZ3QkxL5lSmQITjRayAuuXXHTP7vXqbAqjUunG+3nfU=; b=f7F6ZHT6humA4MCOcQHb3b4FvE XHg2UyUCvnwrm3V3HQat9bhcQMHn9uRxZfN+WZWptxojvzedNgbRQ6zdO8H25DfSLJ7i2zwwxZsE3 h1BJgcJED/e+Bxm5FWj9k9k403bV09VCVhD4z92GSIOJSAs3yspU1p2UWQdyXmvMHQ29DiruJvNR2 Pu+qs9lJR94QFVsH3lWXAycqdetY+FWsWFZCRs0UjkrxIZJSbOjUu6Jm74OHZgcoeAc/MtbAJ1H6e xI1pSsm3VmuJi8mD/jfaubKbubDA8fuPD+DXoEma0p5tat86v08rFl7NhHXkIxHuUobnJIZDlH7kb V9TfcORw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wgg7c-0000000C7XN-102X; Mon, 06 Jul 2026 10:00:16 +0000 Received: from out-178.mta0.migadu.com ([91.218.175.178]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wgg7Z-0000000C7Vx-1llY for linux-arm-kernel@lists.infradead.org; Mon, 06 Jul 2026 10:00:15 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1783332007; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=SZ3QkxL5lSmQITjRayAuuXXHTP7vXqbAqjUunG+3nfU=; b=N13TejMj6aKLDaskvb0oPXUPQdrPBi2Qri7KqBg0czzHUdzykakftn+zwI71VpgOy7qsHM jpXtMmiSk7jgHFUV9osvTD9nzGZ4OmUXB1Et/7bKEgcs4K58xDPbz+NRJhnWV6rJsmrf81 fy7QuZ8SJqSmgJer6RfV95OdFYg1f7o= From: Fuad Tabba To: Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , Vincent Donnefort , Quentin Perret , Sebastian Ene , Hyunwoo Kim , Fuad Tabba Subject: [PATCH v4 0/8] KVM: arm64: pKVM vCPU state management at EL2 (series A) Date: Mon, 6 Jul 2026 10:59:19 +0100 Message-Id: <20260706095927.560795-1-fuad.tabba@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260706_030013_954384_EC148286 X-CRM114-Status: UNSURE ( 9.39 ) X-CRM114-Notice: Please train this message. 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 Hi folks, Changes since v3 [1]: - Rebased onto v7.2-rc2. No code changes. - Carried Vincent's Reviewed-by. Building on Will's pKVM infrastructure series [2], this series reworks how pKVM moves vCPU state between the host and EL2, and stops copying a non-protected guest's state on every world switch. EL2 gains proper primitives for the state it transfers: vCPU lookup helpers, and VGIC flush/sync that reduces how much host state EL2 dereferences. The series also moves some preparatory code (such as sys reg access and PSCI helpers) to shared headers and HYP, and implements lazy copying of a non-protected guest's register state back to the host until the host actually needs it, instead of on every exit. This is the first of two series moving pKVM vCPU state management to EL2. The follow-up completes the job for protected VMs: state isolation, PSCI handling at EL2, and the resulting API behaviour. The series is structured as follows: 01-04: Preparatory refactoring (MPIDR, sys reg access, vCPU reset, PSCI helpers) to shared headers and HYP. 05: Host and hypervisor vCPU lookup primitives. 06-07: VGIC: reduce EL2's exposure to host state, add flush/sync primitives. 08: Lazy state sync for non-protected guests. Based on v7.2-rc2 (8cdeaa50eae8d). Cheers, /fuad [1] https://lore.kernel.org/all/20260626070408.3420953-1-fuad.tabba@linux.dev/ [2] https://lore.kernel.org/all/20260105154939.11041-1-will@kernel.org/ Fuad Tabba (5): KVM: arm64: Extract MPIDR computation into a shared header KVM: arm64: Make vcpu_{read,write}_sys_reg available to HYP code KVM: arm64: Factor out reusable vCPU reset helpers KVM: arm64: Move PSCI helper functions to a shared header KVM: arm64: Implement lazy vCPU state sync for non-protected guests Marc Zyngier (3): KVM: arm64: Add host and hypervisor vCPU lookup primitives KVM: arm64: Minimise EL2's exposure of host VGIC state during world switch KVM: arm64: Add primitives to flush/sync the VGIC state at EL2 arch/arm64/include/asm/kvm_arm.h | 12 ++ arch/arm64/include/asm/kvm_asm.h | 1 + arch/arm64/include/asm/kvm_emulate.h | 79 +++++++- arch/arm64/include/asm/kvm_host.h | 2 + arch/arm64/kvm/arm.c | 7 + arch/arm64/kvm/handle_exit.c | 23 +++ arch/arm64/kvm/hyp/exception.c | 34 +--- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 258 +++++++++++++++++++++++---- arch/arm64/kvm/psci.c | 30 +--- arch/arm64/kvm/reset.c | 60 +------ arch/arm64/kvm/sys_regs.c | 14 +- arch/arm64/kvm/sys_regs.h | 19 ++ include/kvm/arm_psci.h | 27 +++ 13 files changed, 403 insertions(+), 163 deletions(-) base-commit: 8cdeaa50eae8dad34885515f62559ee83e7e8dda -- 2.39.5