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 D839DCD98E6 for ; Fri, 19 Jun 2026 07:05:23 +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-Type:Cc:To:From: Subject:Message-ID:Mime-Version:Date:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=PGcRBYs3Z9Uumpf23hDhMQDIQ6d9ZOsDwaNEYfVocws=; b=QH/JhgJbo0RPZv4O7UOe5X5L3Y J+iQyr6N0GPYA5ZaSkIcxsVSaeJtDEgFo+dSfBP33BwKLGxThNf9krdTrMlhHtDLw5X4MsXIXHyt6 oc9MFHZU6aoH2qot/9TnCbeZcPTAAz2cE5/4OckmhC/uqWmakDmhRfkzYqUtwXHixVQ20UYTTUdnj WXxBIgiMoTgyGQqjCuacq9tQ5UlXfdfx5WvfZK3rSA9wQGOd9gAxDtSUoeoddxsgdKGkrObnvb/qk XOuFSreo4WLnYrEykXHpiY7dvO07rJegC6lT1LzW3Nm9EbE0FvlPSvv0qpe4nis4+zXXgpj22zObW xO6rOkWw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1waTHu-000000024Pe-24CM; Fri, 19 Jun 2026 07:05:14 +0000 Received: from mail-wm1-x34a.google.com ([2a00:1450:4864:20::34a]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1waTHs-000000024Os-1pfS for linux-arm-kernel@lists.infradead.org; Fri, 19 Jun 2026 07:05:13 +0000 Received: by mail-wm1-x34a.google.com with SMTP id 5b1f17b1804b1-490afe64f26so7540575e9.0 for ; Fri, 19 Jun 2026 00:05:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781852710; x=1782457510; darn=lists.infradead.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=PGcRBYs3Z9Uumpf23hDhMQDIQ6d9ZOsDwaNEYfVocws=; b=fnpiR2C8ucZeIudkHVN5UI0czrw14nNL4OmFOhitcZ7v+R5SwEOEf4vkem6WJ8pwkX LOvxEvI2FuIw3rM4Pb0HvLLzeB8lCrocMYPI+8GJXwGs0Da8eA/+HzFQmnWmbj1mAuhm ro7H6FegmBbjufujbW0tN30KChQ+4dROUE+mFI4JClbDgvN+d2s3ocKULuSeUKOimRRc bj7okogqhqVtRMCFb93+eevQ4nD+5tVfuVR+SJ1PoUXgR4yDtuEjgfbmYiTs+Snb+MuK fKyh5+hzh5YUeo9YOwCVMXnq/vziAW+4iiTjHs/xU88tHPViBju5qlvoLeKijyk0AqnH WA3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781852710; x=1782457510; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=PGcRBYs3Z9Uumpf23hDhMQDIQ6d9ZOsDwaNEYfVocws=; b=LMnnJ5m0kIikHar2mfX+a6Emc2NVMgpBGg3LrlvNw8lM5M/XYIyomOYTCTVKzTz3VO HCwCwf7Mdpzqk5phAKcMeWsZ8sEQSpz0Xp1REOmwGUwKAvePfzbOfjrarJFv7cYz7vbO 88e2UlSzCOAS5ffB0pCbVprjkswlPCi2tPpW9sdjbGZlPL3NqoWvKA4OGo+Pd20QtbS0 gfIJl8Dj+t83rpHq48b0zqxhOy76EbAyaDHrw9LyjeoOLCxKa/rAE3OgdDuShDsnYybI kE/cyUCvmzrB4Hp67qQ/jcqzwfWuQRUysG29XqK+7H4o7esv4sBA3u6WXGoayK9Cz2i5 wJLQ== X-Forwarded-Encrypted: i=1; AFNElJ8dtsemahF0DY+JUS156Xc+esEi8n8zo625zK1ITnp0IsuzaiI1DoMTSREisYCe9rqz63KaYUoWIbyJ2nMm3gQL@lists.infradead.org X-Gm-Message-State: AOJu0Yy0ULKdGiD7WxFoRidegbVeyNkNuy7nFEimgB+eftcVLim1xdr5 opxi1rGBw3T4YGJvOQQnLMql2W7SSMC2OjqAPg3fxt5abIALK9a6anFQKN/q735gawhdBiTBBXg 3Vg== X-Received: from wmpu38.prod.google.com ([2002:a05:600c:4d26:b0:492:4314:560e]) (user=tabba job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600d:15a:20b0:490:5000:917 with SMTP id 5b1f17b1804b1-492409fbfc4mr20439135e9.1.1781852709851; Fri, 19 Jun 2026 00:05:09 -0700 (PDT) Date: Fri, 19 Jun 2026 08:05:00 +0100 Mime-Version: 1.0 X-Mailer: git-send-email 2.55.0.rc0.738.g0c8ab3ebcc-goog Message-ID: <20260619070508.802802-1-tabba@google.com> Subject: [PATCH 0/8] KVM: arm64: Rework pKVM vCPU state synchronisation 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 Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260619_000512_544596_A10CCBE1 X-CRM114-Status: GOOD ( 11.81 ) 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 v1 [2]: - Dropped the guard()/scoped_guard() conversion patches: standalone churn on code this series does not otherwise rework. (Marc) - Rebased onto kvmarm/next. The VGIC flush primitive now bounds used_lrs using the cached hyp_gicv3_nr_lr instead of reading ICH_VTR_EL2 on every entry. (Marc) - Grouped the PKVM_HOST_STATE_DIRTY flag with the other iflags and clarified its comment. (Marc) - Sync PSTATE alongside PC on every non-protected exit, and sync+dirty before host-side SError injection so the syndrome is not dropped. (sashiko) - Various cleanups and tidying up. (Vincent) Building on Will's pKVM infrastructure series [1], 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 kvmarm/next. [1] https://lore.kernel.org/all/20260105154939.11041-1-will@kernel.org/ [2] https://lore.kernel.org/all/20260612065925.755562-1-tabba@google.com/ Cheers, /fuad 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 | 30 ++++ 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, 410 insertions(+), 163 deletions(-) -- 2.55.0.rc0.738.g0c8ab3ebcc-goog