On Tue, May 17, 2022 at 10:45:16AM -0700, Andrew Morton wrote: > On Tue, 17 May 2022 18:34:31 +0300 "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > > > UEFI Specification version 2.9 introduces the concept of memory > > acceptance. Some Virtual Machine platforms, such as Intel TDX or AMD > > SEV-SNP, require memory to be accepted before it can be used by the > > guest. Accepting happens via a protocol specific to the Virtual Machine > > platform. > > > > ... > > > > --- a/include/linux/page-flags.h > > +++ b/include/linux/page-flags.h > > @@ -928,6 +928,14 @@ static inline bool is_page_hwpoison(struct page *page) > > #define PG_offline 0x00000100 > > #define PG_table 0x00000200 > > #define PG_guard 0x00000400 > > +#define PG_unaccepted 0x00000800 > > "For pages that are never mapped to userspace (and aren't PageSlab), > page_type may be used." > > Is that true of these pages? Yes. PG_unaccepted is never set for any allocated page. It is only set for pages on free lists. It gets cleared in post_alloc_hook(). -- Kirill A. Shutemov
