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Peter Anvin" , virtualization@lists.linux.dev, bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, Christoph Lameter , Andrew Morton , Bo Gan , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, Jonathan Corbet , "K. Y. Srinivasan" , Haiyang Zhang , Long Li , Andy Lutomirski , Peter Zijlstra , linux-doc@vger.kernel.org, linux-hyperv@vger.kernel.org, Nathan Chancellor , Kees Cook , Ashish Kalra Subject: [PATCH v2 0/6] x86/percpu: Share decrypted storage before guest setup Date: Tue, 29 Sep 2026 00:02:49 -0400 Message-ID: <20260929040256.543767-1-zack.rusin@broadcom.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e VMware publishes its per-CPU steal-time GPA without first sharing the storage in encrypted guests. Following Kiryl's review, this series moves sharing into early per-CPU initialization for both KVM and VMware. This replaces the VMware fix from Bo Gan and Alexey Makhalov: https://lore.kernel.org/r/20260309235250.2611115-5-alexey.makhalov@broadcom.com The common helper uses boot-time page-table allocation and preserves initial contents on AMD and TDX. Conversion precedes buffer registration on SMP and UP; failures stop boot. Encrypted guests use the embedded allocator, warn on percpu_alloc=page, and never fall back to page mode. There is no driver conversion loop or readiness flag. .bss..decrypted remains outside this series. I interpreted the allocator requirement as guest-specific, so both it and per-CPU conversion use CC_ATTR_GUEST_MEM_ENCRYPT and leave bare-metal SME behavior unchanged. Two corrections to v1: its isolation claim missed UP, where ordinary data could share the decrypted objects' page; patch 1 fixes that separately. TDX's vmalloc constraint concerns private aliases and adjacent accesses through load_unaligned_zeropad(), not just GPA lookup. This series removes the unused declaration macro and adds explicit SMP/UP section boundaries. I have not carried the v1 Ack onto the revised patches; renewed review would be appreciated. Tested on VMware ESXi with SEV-SNP and TDX guests, and on KVM with SEV and SEV-SNP guests, using SMP and UP kernels. v1: https://lore.kernel.org/r/cover.1789488039.git.zack.rusin@broadcom.com Zack Rusin (6): percpu: Page-align decrypted data in UP kernels percpu: Bound decrypted storage for all x86 encrypted guests x86/percpu: Require embedded allocation in encrypted guests x86/mm: Provide common early memory decryption x86/tdx: Support early sharing of kernel data x86/percpu: Share decrypted storage before guest CPU setup .../admin-guide/kernel-parameters.txt | 3 + arch/x86/coco/sev/core.c | 16 ++ arch/x86/coco/tdx/tdx.c | 32 ++++ arch/x86/hyperv/ivm.c | 4 + arch/x86/include/asm/mem_encrypt.h | 9 +- arch/x86/include/asm/x86_init.h | 4 + arch/x86/kernel/cpu/vmware.c | 2 +- arch/x86/kernel/kvm.c | 35 ----- arch/x86/kernel/setup.c | 2 + arch/x86/kernel/setup_percpu.c | 14 +- arch/x86/mm/mem_encrypt.c | 139 ++++++++++++++++++ arch/x86/mm/mem_encrypt_amd.c | 12 +- include/asm-generic/vmlinux.lds.h | 19 ++- include/linux/percpu-defs.h | 7 +- 14 files changed, 247 insertions(+), 51 deletions(-) base-commit: 93f51579e7df248780214094418f205253383cc5 -- 2.53.0