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 F15D6C55175 for ; Mon, 3 Aug 2026 10:11:33 +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=//RZJaGyoeI1RxifgtDLFRHQpm92KEJu8DMKbfF6oOo=; b=3KcHCMvM8uRVxnjrWfe1kjd4Lf 7MiIL5NzUF82SUah9jNZqQTuMAKrk2Ej99yOL99iacm04Z81wLpDGV8+1uto9k8LorjSIXELk+Pkb JEczupI1E5ZMxzpkiaQOAjHSgh6s2beyBpAExhAnADc5gtLnxIAq0hS7xMvohyAz0R0FoJNc6vzEq 8t6XK65vV6w+VMwh9XMQvElK0pqGyqP6zy4foNTYgLS403bFAyHeRPh3gi1tTAQugUwETujSxAdPf 4FdoGyeES8SonTuZuYHMLx6x3XKHsHMErhxXPt4IRJvzk2oDlKwFy9EJXlcChqbACZKZcEi/4u0Yq 7+tEMaiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wqpdI-0000000GmmX-1dmg; Mon, 03 Aug 2026 10:10:56 +0000 Received: from mail-wm1-x348.google.com ([2a00:1450:4864:20::348]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wqpdG-0000000Gmlf-1YAb for linux-arm-kernel@lists.infradead.org; Mon, 03 Aug 2026 10:10:55 +0000 Received: by mail-wm1-x348.google.com with SMTP id 5b1f17b1804b1-495569acf8dso12865995e9.1 for ; Mon, 03 Aug 2026 03:10:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785751851; x=1786356651; darn=lists.infradead.org; h=content-type:cc:to:from:subject:message-id:mime-version:date:from :to:cc:subject:date:message-id:reply-to:content-type; bh=//RZJaGyoeI1RxifgtDLFRHQpm92KEJu8DMKbfF6oOo=; b=lUu7mdyOqIC19sGeRsUUHkAvjauCDkyM/kbaJsprpVUJKOZseQJHqRFvmYi/c2vycB T0W2eS8KmZY1WXkysjJ7lLcL7zExmuZk2eHARK966k866Da0N9AFcLAGNsvo7nn0PLAV /W8wUaBHpiX52olCdkdZmeuvT6JE87qQtkuDPNMBvd1o2HSabbMDz3qAuFGHYCOjo0+V domNn+PQpQUq4djTCuMCMZOdGvsGzzukm7PPPApHW8L+VjMbCkjEtLe1pYfm+itAYO1W Qbb/W0ULHPsMyIAJw9Anf+thJkRMpcSxE7ZZwErzMqr8h8Vpz4Ee37EUXbgrmffPsIaP lZvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785751851; x=1786356651; h=content-type:cc:to:from:subject:message-id:mime-version:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=//RZJaGyoeI1RxifgtDLFRHQpm92KEJu8DMKbfF6oOo=; b=NX+KoJznq+mKbwVCBHlIl/75VWkkvulKE6HFubsUNdRevRUEWKY2GCe56ZCdH/GOlZ KSf9uaIwjstgmsw2tkuxbMDL2TIHMD0XXdhVRCyhLvHC3VEcYVuX290DqIq75xCZ4QN3 ifoZlInAXLvnJwWeXY9WSxrbKyj2/q2E+jvKucVWOiZRdssvUZIjChBkxNzypqS1ckKv k1529KKUJB0QIDMtWJEW3oJpw1KBIsQ5zLYb6tlxoLgEHXkC5wT6xl2Lo1qEQtn2w09T gxYPuzOc4pJ88K0T/vDyxmcKqBErvY3Hr1/8onX4mXkh86EqdmEAJIdiCEAUvRvZSSBq pPQg== X-Forwarded-Encrypted: i=1; AHgh+RpPMkzXGrb5ZsgfGrKxEfhEuPyZghB9zEaMfLM9ta3QlYAMuSOixLR1OlA00CfvMKbn8jLm5F2PMG8UKRwrLEXt@lists.infradead.org X-Gm-Message-State: AOJu0YxSzTknRwyT5ZXoqNgb2waFRhIJY94a/+gIpAXlu1kmJTtOUo4z Ja7zLeyGDUJTSpD8JTjRYjvU4M3hUXDysFw6NouhZpT3yQilk2QU5HQxblRwYFEzsdwz2juwrKT b2wTnA99MKgu5a7q5Xsnsdg== X-Received: from wmrk14.prod.google.com ([2002:a05:600c:b4e:b0:493:b4d4:96bf]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:8b54:b0:495:4859:8f9b with SMTP id 5b1f17b1804b1-4980c674f25mr238962235e9.9.1785751851273; Mon, 03 Aug 2026 03:10:51 -0700 (PDT) Date: Mon, 3 Aug 2026 11:08:44 +0100 Mime-Version: 1.0 X-Mailer: git-send-email 2.55.0.508.g3f0d502094-goog Message-ID: <20260803100904.3563942-1-vdonnefort@google.com> Subject: [PATCH 00/20] Huge mapping support for protected VMs From: Vincent Donnefort To: maz@kernel.org, oupton@kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, kernel-team@android.com, fuad.tabba@linux.dev, qperret@google.com, keirf@google.com, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260803_031054_427151_87021F05 X-CRM114-Status: GOOD ( 12.79 ) 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 Currently, pKVM handles stage-2 mappings and ownership tracking strictly at the PAGE_SIZE level. This series extends pKVM to support PMD_SIZE block mappings, thereby enabling Transparent Huge Pages (THP) for protected guests. hugetlbfs is currently unsupported as it does not appear as swapbacked. Summary of changes: 1. Enable host stage-2 block-level annotations: The host stage-2 being annotated with the GFN of the guest on the host->guest donation transitions, we allow block-level annotations to ensure the host stage-2 mapping size matches the guest stage-2. 2. Expand ownership transition HVCs: Enable the ownership test to work with PMD_SIZE so we can test transitions supporting more than PAGE_SIZE. 3. Implements the `PKVM_HYP_REQ_SPLIT` hypervisor request: Allows the hypervisor to ask the host to split a mapping. This ensures the guest s2, pkvm_mapping tree and host s2 are always using the same mapping size. 4. Wires up THP support for pKVM guests. Keir Fraser (1): KVM: arm64: Prefault host stage-2 entries on block split Vincent Donnefort (19): KVM: arm64: Propagate host stage-2 annotated entries on block split KVM: arm64: Allow block-level stage-2 annotation KVM: arm64: Use block-level annotations when setting up the host stage-2 KVM: arm64: Make pKVM ownership selftest an HVC KVM: arm64: Add a range to __pkvm_host_share/unshare_hyp() KVM: arm64: Add a range to __pkvm_host_donate_guest() KVM: arm64: Add a range to __pkvm_host_reclaim_page_guest() KVM: arm64: Add a range to __pkvm_guest_share_host() KVM: arm64: Add a range to __pkvm_guest_unshare_host() KVM: arm64: Add a range to pKVM ownership selftest KVM: arm64: Handle huge mappings in __pkvm_host_force_reclaim_page_guest() KVM: arm64: Handle huge mappings in __pkvm_vcpu_in_poison_fault() KVM: arm64: pkvm: Warn on guest stage-2 block collapse KVM: arm64: Add pkvm_hyp_req infrastructure KVM: arm64: Add __pkvm_host_split_guest HVC KVM: arm64: Extend pKVM page ownership selftests to cover guest block split KVM: arm64: Add PKVM_HYP_REQ_SPLIT KVM: arm64: Raise PKVM_HYP_REQ_SPLIT on guest to host sharing KVM: arm64: Stage-2 huge mappings for protected VMs arch/arm64/include/asm/kvm_asm.h | 12 +- arch/arm64/include/asm/kvm_host.h | 19 + arch/arm64/include/asm/kvm_pgtable.h | 3 +- arch/arm64/include/asm/kvm_pkvm.h | 21 +- arch/arm64/kvm/arm.c | 2 + arch/arm64/kvm/handle_exit.c | 3 + arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 25 +- arch/arm64/kvm/hyp/include/nvhe/memory.h | 5 + arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 6 +- arch/arm64/kvm/hyp/nvhe/ffa.c | 12 +- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 47 +- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 545 ++++++++++++------ arch/arm64/kvm/hyp/nvhe/pkvm.c | 59 +- arch/arm64/kvm/hyp/nvhe/setup.c | 152 +++-- arch/arm64/kvm/hyp/pgtable.c | 113 +++- arch/arm64/kvm/mmu.c | 72 ++- arch/arm64/kvm/pkvm.c | 247 +++++++- arch/arm64/kvm/trace_pkvm.h | 44 ++ 18 files changed, 1036 insertions(+), 351 deletions(-) create mode 100644 arch/arm64/kvm/trace_pkvm.h base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff -- 2.55.0.508.g3f0d502094-goog