On Tue, Sep 29, 2026 at 12:02:51AM -0400, Zack Rusin wrote: > 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 <[email protected]> > Link: https://lore.kernel.org/r/aqqGUAX65s4LdJkr@thinkstation > Signed-off-by: Zack Rusin <[email protected]> > --- > 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
> @@ -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 So you're page aligning something that will get different protection and will thus shatter large pages? That is somewhat uncool. We like large pages, large pages are good.
