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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 2/6] percpu: Bound decrypted storage for all x86 encrypted guests Date: Tue, 29 Sep 2026 00:02:51 -0400 Message-ID: <20260929040256.543767-3-zack.rusin@broadcom.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260929040256.543767-1-zack.rusin@broadcom.com> References: <20260929040256.543767-1-zack.rusin@broadcom.com> Precedence: bulk X-Mailing-List: linux-arch@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 TDX also needs shared per-CPU buffers. Use X86_MEM_ENCRYPT for their definition and placement, and provide page-aligned boundaries so the architecture can convert each CPU's whole section before registration. Define the boundaries in the SMP template or UP data as appropriate. Drop the unused DECLARE_PER_CPU_DECRYPTED() macro. Suggested-by: Kiryl Shutsemau Link: https://lore.kernel.org/r/aqqGUAX65s4LdJkr@thinkstation Signed-off-by: Zack Rusin --- include/asm-generic/vmlinux.lds.h | 12 ++++++++---- include/linux/percpu-defs.h | 7 ++----- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 64bc2bfdd2ec..145fcdbbe9db 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -368,11 +368,13 @@ /* * .data section */ -#if defined(CONFIG_AMD_MEM_ENCRYPT) && !defined(CONFIG_SMP) +#if defined(CONFIG_X86_MEM_ENCRYPT) && !defined(CONFIG_SMP) #define DATA_DECRYPTED \ . = ALIGN(PAGE_SIZE); \ + __start_percpu_decrypted = .; \ *(.data..decrypted) \ - . = ALIGN(PAGE_SIZE); + . = ALIGN(PAGE_SIZE); \ + __end_percpu_decrypted = .; #else #define DATA_DECRYPTED *(.data..decrypted) #endif @@ -1022,11 +1024,13 @@ * Note: We use a separate section so that only this section gets * decrypted to avoid exposing more than we wish. */ -#ifdef CONFIG_AMD_MEM_ENCRYPT +#if defined(CONFIG_X86_MEM_ENCRYPT) && defined(CONFIG_SMP) #define PERCPU_DECRYPTED_SECTION \ . = ALIGN(PAGE_SIZE); \ + __start_percpu_decrypted = .; \ *(.data..percpu..decrypted) \ - . = ALIGN(PAGE_SIZE); + . = ALIGN(PAGE_SIZE); \ + __end_percpu_decrypted = .; #else #define PERCPU_DECRYPTED_SECTION #endif diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h index dbe3267a0a13..fdb666a1b4de 100644 --- a/include/linux/percpu-defs.h +++ b/include/linux/percpu-defs.h @@ -169,13 +169,10 @@ DEFINE_PER_CPU_SECTION(type, name, "..read_mostly") /* - * Declaration/definition used for per-CPU variables that should be accessed + * Definition used for built-in per-CPU variables that should be accessed * as decrypted when memory encryption is enabled in the guest. */ -#ifdef CONFIG_AMD_MEM_ENCRYPT -#define DECLARE_PER_CPU_DECRYPTED(type, name) \ - DECLARE_PER_CPU_SECTION(type, name, "..decrypted") - +#ifdef CONFIG_X86_MEM_ENCRYPT #define DEFINE_PER_CPU_DECRYPTED(type, name) \ DEFINE_PER_CPU_SECTION(type, name, "..decrypted") #else -- 2.53.0