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 7762935EDBA for ; Mon, 19 Jan 2026 12:46:53 +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=1768826813; cv=none; b=W1WO9MafCDBp+Qtq3/UOLyGjXMsTrAHe4uN9b+OZBRktyR4Gi1kNk+EWVP3NGr9nSNAYYM2XECXlWW3ze9xh4Rr/PYm1z6VihvnF+/IvmtWUwweniZPTClsgq/QLLwgEHaMe0iVef2em3G7eynGr1jlWX6sR/IgmH3tBZHjSk7o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768826813; c=relaxed/simple; bh=YJ9e/R24mcZ6mGK1DihOlExa+pPF4aCUH5QlK/D4yPA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=o+ORaObis9rB1FP1yG79x4dBODX/LoWsg5+4i3KWqWe/KEMCDWpwytNaKoi/2TSgSp66O2AHPHgY97PyfN27XQeP43nVG/T4TiqSvyqn4ZLYYTczFqAw0msnWu4Ik/1rvbxgN6IK8vsBuDlPT+Up53X270iix/5kHQbyyFyet1Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bzJoVJs4; 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="bzJoVJs4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E8E8C116C6; Mon, 19 Jan 2026 12:46:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768826813; bh=YJ9e/R24mcZ6mGK1DihOlExa+pPF4aCUH5QlK/D4yPA=; h=From:To:Cc:Subject:Date:From; b=bzJoVJs4+Lai5ii+QpmQH2AnEboNDuMEW6z1pXg0DoOfY9/LkjYPjDAJpbD7Ok6y5 K0GKXBsJx7D0SW6ewUvxDh4M6ZkUIBP3Kf/mtzy/0tkmiq1qgfKV6BXUJAODW7VIrc WYVn7dAQERvEXDvhqxKD4PKw1Rh1rzOgWbw9W/oW6U3Ckeo6RgOOL/LCKLo8d3JtD8 7C96PLv0rHi8Khypx+/W5DfEQ3IrOMz3G1M8GPm+VPccVlLpxFj1YeORwU1kiwGi0w mX+oalBQJQNM+xuOqxqnuktImP5swhoXNYq3O/kcaqxlgWvjID1BlpWXvCzLEFTwDh JCPYbztIsAqSQ== 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 Subject: [PATCH v2 00/35] KVM: arm64: Add support for protected guest memory with pKVM Date: Mon, 19 Jan 2026 12:45:53 +0000 Message-ID: <20260119124629.2563-1-will@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 Hi folks, It's back and it's even bigger than before! Although the first patch has been picked up as a fix (thanks, Oliver), review feedback has resulted in some additional patches being included in the series. If you'd like to see the first version, it's available here: https://lore.kernel.org/kvmarm/20260105154939.11041-1-will@kernel.org/ Changes since v1 include: * Change hypercall order so that pKVM-specific calls are in their own range * Make 'pkvm_handle_t' a u16 and check its size at compile-time * Rework pte annotations to take a 4-bit type field * Fix a memory leak on the kvm_arch_init_vm() failure path * Pass KVM_PGTABLE_WALK_IGNORE_EAGAIN when mapping into the host idmap * Avoid host annotation when reclaiming guest pages * Re-instate guest pte metadata when unsharing a page * Extend selftests to cover guest share and unshare hypercalls * Drop broken MMU notifier changes * Documentation tweaks As before, patches are based on v6.19-rc4 and are also available at: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=kvm/protected-memory All feedback welcome. 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 --->8 Fuad Tabba (1): KVM: arm64: Expose self-hosted debug regs as RAZ/WI for protected guests Quentin Perret (2): KVM: arm64: Refactor enter_exception64() KVM: arm64: Inject SIGSEGV on illegal accesses Will Deacon (32): KVM: arm64: Invert KVM_PGTABLE_WALK_HANDLE_FAULT to fix pKVM walkers 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: 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 .../admin-guide/kernel-parameters.txt | 4 +- Documentation/virt/kvm/arm/index.rst | 1 + Documentation/virt/kvm/arm/pkvm.rst | 103 +++ arch/arm64/include/asm/kvm_asm.h | 27 +- arch/arm64/include/asm/kvm_emulate.h | 5 + arch/arm64/include/asm/kvm_host.h | 9 +- arch/arm64/include/asm/kvm_pgtable.h | 51 +- arch/arm64/include/asm/kvm_pkvm.h | 4 +- arch/arm64/include/asm/virt.h | 6 + arch/arm64/kvm/Kconfig | 10 + arch/arm64/kvm/arm.c | 12 +- arch/arm64/kvm/hyp/exception.c | 100 +-- arch/arm64/kvm/hyp/include/nvhe/mem_protect.h | 9 + arch/arm64/kvm/hyp/include/nvhe/memory.h | 6 + arch/arm64/kvm/hyp/include/nvhe/pkvm.h | 7 +- arch/arm64/kvm/hyp/nvhe/hyp-main.c | 125 ++-- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 595 ++++++++++++++++-- arch/arm64/kvm/hyp/nvhe/pkvm.c | 224 ++++++- arch/arm64/kvm/hyp/nvhe/switch.c | 1 + arch/arm64/kvm/hyp/nvhe/sys_regs.c | 8 + arch/arm64/kvm/hyp/pgtable.c | 38 +- arch/arm64/kvm/mmu.c | 122 +++- arch/arm64/kvm/pkvm.c | 149 ++++- arch/arm64/mm/fault.c | 31 +- include/uapi/linux/kvm.h | 5 + 25 files changed, 1405 insertions(+), 247 deletions(-) create mode 100644 Documentation/virt/kvm/arm/pkvm.rst -- 2.52.0.457.g6b5491de43-goog