Re: [PATCH v3 31/34] xen/riscv: add minimal stuff to mm.h to build full Xen

[Oleksii <oleksii.kurochko@xxxxxxxxx>]

On Fri, 2023-12-22 at 18:32 +0200, Oleksii wrote:
> > +
> > +struct page_info
> > +{
> > +    /* Each frame can be threaded onto a doubly-linked list. */
> > +    struct page_list_entry list;
> > +
> > +    /* Reference count and various PGC_xxx flags and fields. */
> > +    unsigned long count_info;
> > +
> > +    /* Context-dependent fields follow... */
> > +    union {
> > +        /* Page is in use: ((count_info & PGC_count_mask) != 0).
> > */
> > +        struct {
> > +            /* Type reference count and various PGT_xxx flags and
> > fields. */
> > +            unsigned long type_info;
> > +        } inuse;
> > +        /* Page is on a free list: ((count_info & PGC_count_mask)
> > ==
> > 0). */
> > +        union {
> > +            struct {
> > +                /*
> > +                 * Index of the first *possibly* unscrubbed page
> > in
> > the buddy.
> > +                 * One more bit than maximum possible order to
> > accommodate
> > +                 * INVALID_DIRTY_IDX.
> > +                 */
> > +#define INVALID_DIRTY_IDX ((1UL << (MAX_ORDER + 1)) - 1)
> > +                unsigned long first_dirty:MAX_ORDER + 1;
> > +
> > +                /* Do TLBs need flushing for safety before next
> > page
> > use? */
> > +                bool need_tlbflush:1;
> > +
> > +#define BUDDY_NOT_SCRUBBING    0
> > +#define BUDDY_SCRUBBING        1
> > +#define BUDDY_SCRUB_ABORT      2
> > +                unsigned long scrub_state:2;
> > +            };
> > +
> > +                unsigned long val;
> > +            } free;
> > +
> > +    } u;
> > +
> > +    union {
> > +        /* Page is in use, but not as a shadow. */
> > +        struct {
> > +            /* Owner of this page (zero if page is anonymous). */
> > +            struct domain *domain;
> > +        } inuse;
> > +
> > +        /* Page is on a free list. */
> > +        struct {
> > +            /* Order-size of the free chunk this page is the head
> > of. */
> > +            unsigned int order;
> > +        } free;
> > +
> > +    } v;
> > +
> > +    union {
> > +        /*
> > +         * Timestamp from 'TLB clock', used to avoid extra safety
> > flushes.
> > +         * Only valid for: a) free pages, and b) pages with zero
> > type count
> > +         */
> > +        uint32_t tlbflush_timestamp;
> > +    };
> > +    uint64_t pad;
I think it can be removed too. The changes weren't saved. ( Just
another one reminder for me ).

Sorry for the convenience.

~ Oleksii
>