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 81BF91061B02 for ; Mon, 30 Mar 2026 14:48:57 +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=+66i0+NEqb5bbxKFGg8fovNrcxiQO7n74V5N5Qc1Ufg=; b=yhlVSKQoImAqd2n0dLmxucgoKT xNY7F6+Ibf5Ncnt5jaNvnnnb4ZUWjAYImkCC3go/1FvxI8Y18MkGkRK2u9GBXXNhXz3u7uazVeys1 bwXjxTow9tCY+xMB+nWxm8qA7/PdzEOYUGCYhg88ApczEnP8vDcciy4xCrvPb4BmZj4H3X11EorJv trGEsit8evZ132TkykBfHTzidMRB1poSmBZKpDtWXhYAS1vs87cv5SDFQtr04M1daQ7BCprq02ly6 /KSe5EurcNL9JJycubxZ0r27YfqrXeZOlBKGNjPowgvSBsYoUevXqJwjX6Nfx6jfMd5sR2AHeK3+p ffsvXCgw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7DvB-0000000BSnC-2OMY; Mon, 30 Mar 2026 14:48:53 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w7DvA-0000000BSn1-0YWA for linux-arm-kernel@lists.infradead.org; Mon, 30 Mar 2026 14:48:52 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 7FDFD600CB; Mon, 30 Mar 2026 14:48:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 703B0C19423; Mon, 30 Mar 2026 14:48:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774882131; bh=NrRyOsVjOHoPrL6iv8tTnDhamv18Yc2Yh+BKq0iPw3U=; h=From:To:Cc:Subject:Date:From; b=LDxJphnhxDQ5+QBR7ZVz8YElpXuAciEF0HNA0S07NRqfPJZwjcUdiFikuehe7g4v9 wiDGQNMNure4FJ2+nNTkueMMiE9zWLi4B2IQkLY+RfBRvoOLwbgKsRyPRgT8My54Y0 Cdl0vPZnqYJ4GRApfSTf08rwQHYmGbRdX9iTr9kXfSXFPVjMkw8+w5lJPL3pyOYavL JaAXJ5+s/ZsJMVTRj4+UpFR99B9eprLPFp128g2ZDsIILCKnKB/pIPED4u7TRMeiuI rpu8QpDQntLjFsFha+zEqBN5MSk8R/wxEWP9uNrRcYtWhES29+cocdlU0jzAhnHzhd Cx2To5/C5dBbQ== From: Will Deacon To: kvmarm@lists.linux.dev Cc: linux-arm-kernel@lists.infradead.org, Will Deacon , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Quentin Perret , Fuad Tabba , Vincent Donnefort , Mostafa Saleh , Alexandru Elisei Subject: [PATCH v5 00/38] KVM: arm64: Add support for protected guest memory with pKVM Date: Mon, 30 Mar 2026 15:48:01 +0100 Message-ID: <20260330144841.26181-1-will@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 everyone, As promised on Friday, here's v5 of the pKVM protected memory patches previously posted here: v1: https://lore.kernel.org/kvmarm/20260105154939.11041-1-will@kernel.org/ v2: https://lore.kernel.org/kvmarm/20260119124629.2563-1-will@kernel.org/ v3: https://lore.kernel.org/r/20260305144351.17071-1-will@kernel.org v4: https://lore.kernel.org/r/20260327140039.21228-1-will@kernel.org This version primarily addresses the comments from Sashiko that I think are valid: * Mask out page offset from physical address passed to "force reclaim" hypercall. * Check for 'is_dying' in get_pkvm_hyp_vm() to prevent taking a reference on a VM in the process of being destroyed. * Take the 'slots_lock' while creating the hyp vm to avoid racing with check in kvm_arch_prepare_memory_region(). * Keep trying to reclaim pages from a dying guest if we fail part-way through. * Fix return value from pkvm_pgtable_stage2_test_clear_young() if it's unexpectedly called for a pVM. As before, I've pushed an updated branch with this series: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=kvm/protected-memory and the kvmtool patches are available at: https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/log/?h=pkvm Cheers, Will Cc: Marc Zyngier Cc: Oliver Upton Cc: Joey Gouly Cc: Suzuki K Poulose Cc: Zenghui Yu Cc: Catalin Marinas Cc: Quentin Perret Cc: Fuad Tabba Cc: Vincent Donnefort Cc: Mostafa Saleh Cc: Alexandru Elisei --->8 Fuad Tabba (1): KVM: arm64: Expose self-hosted debug regs as RAZ/WI for protected guests Quentin Perret (1): KVM: arm64: Inject SIGSEGV on illegal accesses Will Deacon (36): KVM: arm64: Remove unused PKVM_ID_FFA definition KVM: arm64: Don't leak stage-2 page-table if VM fails to init under pKVM KVM: arm64: Move handle check into pkvm_pgtable_stage2_destroy_range() KVM: arm64: Rename __pkvm_pgtable_stage2_unmap() KVM: arm64: Don't advertise unsupported features for protected guests KVM: arm64: Remove is_protected_kvm_enabled() checks from hypercalls KVM: arm64: Ignore MMU notifier callbacks for protected VMs KVM: arm64: Prevent unsupported memslot operations on protected VMs KVM: arm64: Ignore -EAGAIN when mapping in pages for the pKVM host KVM: arm64: Split teardown hypercall into two phases KVM: arm64: Introduce __pkvm_host_donate_guest() KVM: arm64: Hook up donation hypercall to pkvm_pgtable_stage2_map() KVM: arm64: Handle aborts from protected VMs KVM: arm64: Introduce __pkvm_reclaim_dying_guest_page() KVM: arm64: Hook up reclaim hypercall to pkvm_pgtable_stage2_destroy() KVM: arm64: Factor out pKVM host exception injection logic KVM: arm64: Support translation faults in inject_host_exception() KVM: arm64: Avoid pointless annotation when mapping host-owned pages KVM: arm64: Generalise kvm_pgtable_stage2_set_owner() KVM: arm64: Introduce host_stage2_set_owner_metadata_locked() KVM: arm64: Change 'pkvm_handle_t' to u16 KVM: arm64: Annotate guest donations with handle and gfn in host stage-2 KVM: arm64: Introduce hypercall to force reclaim of a protected page KVM: arm64: Reclaim faulting page from pKVM in spurious fault handler KVM: arm64: Return -EFAULT from VCPU_RUN on access to a poisoned pte KVM: arm64: Add hvc handler at EL2 for hypercalls from protected VMs KVM: arm64: Implement the MEM_SHARE hypercall for protected VMs KVM: arm64: Implement the MEM_UNSHARE hypercall for protected VMs KVM: arm64: Allow userspace to create protected VMs when pKVM is enabled KVM: arm64: Add some initial documentation for pKVM KVM: arm64: Extend pKVM page ownership selftests to cover guest donation KVM: arm64: Register 'selftest_vm' in the VM table KVM: arm64: Extend pKVM page ownership selftests to cover forced reclaim KVM: arm64: Extend pKVM page ownership selftests to cover guest hvcs KVM: arm64: Rename PKVM_PAGE_STATE_MASK drivers/virt: pkvm: Add Kconfig dependency on DMA_RESTRICTED_POOL .../admin-guide/kernel-parameters.txt | 4 +- Documentation/virt/kvm/arm/index.rst | 1 + Documentation/virt/kvm/arm/pkvm.rst | 106 ++++ arch/arm64/include/asm/kvm_asm.h | 31 +- arch/arm64/include/asm/kvm_host.h | 9 +- arch/arm64/include/asm/kvm_pgtable.h | 45 +- arch/arm64/include/asm/kvm_pkvm.h | 4 +- arch/arm64/include/asm/virt.h | 9 + arch/arm64/kvm/arm.c | 12 +- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 10 +- arch/arm64/kvm/hyp/include/nvhe/memory.h | 12 +- arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 7 +- .../arm64/kvm/hyp/include/nvhe/trap_handler.h | 2 + arch/arm64/kvm/hyp/nvhe/hyp-main.c | 184 +++--- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 587 ++++++++++++++++-- arch/arm64/kvm/hyp/nvhe/pkvm.c | 232 ++++++- arch/arm64/kvm/hyp/nvhe/switch.c | 1 + arch/arm64/kvm/hyp/nvhe/sys_regs.c | 8 + arch/arm64/kvm/hyp/pgtable.c | 33 +- arch/arm64/kvm/mmu.c | 114 +++- arch/arm64/kvm/pkvm.c | 157 ++++- arch/arm64/mm/fault.c | 33 +- drivers/virt/coco/pkvm-guest/Kconfig | 2 +- include/uapi/linux/kvm.h | 5 + 24 files changed, 1380 insertions(+), 228 deletions(-) create mode 100644 Documentation/virt/kvm/arm/pkvm.rst -- 2.53.0.1018.g2bb0e51243-goog