xen: factor out allocation of page tables into separate function
Do the allocation of page tables in a separate function. This will allow to do the allocation at different times of the boot preparations depending on the features the kernel is supporting. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Juergen Gross
Daniel Kiper
parent
1fbb2b4b39
commit
d73976fdff
1 changed files with 53 additions and 32 deletions
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@ -51,6 +51,9 @@ struct xen_loader_state {
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struct start_info *virt_start_info;
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grub_xen_mfn_t console_pfn;
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grub_uint64_t max_addr;
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grub_uint64_t *virt_pgtable;
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grub_uint64_t pgtbl_start;
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grub_uint64_t pgtbl_end;
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struct xen_multiboot_mod_list *module_info_page;
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grub_uint64_t modules_target_start;
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grub_size_t n_modules;
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@ -110,17 +113,17 @@ get_pgtable_size (grub_uint64_t total_pages, grub_uint64_t virt_base)
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static void
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generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start,
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grub_uint64_t total_pages, grub_uint64_t virt_base,
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grub_xen_mfn_t *mfn_list)
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grub_uint64_t paging_end, grub_uint64_t total_pages,
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grub_uint64_t virt_base, grub_xen_mfn_t *mfn_list)
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{
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if (!virt_base)
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total_pages++;
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paging_end++;
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grub_uint64_t lx[NUMBER_OF_LEVELS], lxs[NUMBER_OF_LEVELS];
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grub_uint64_t nlx, nls, sz = 0;
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int l;
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nlx = total_pages;
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nlx = paging_end;
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nls = virt_base >> PAGE_SHIFT;
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for (l = 0; l < NUMBER_OF_LEVELS; l++)
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{
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@ -164,7 +167,7 @@ generate_page_table (grub_uint64_t *where, grub_uint64_t paging_start,
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if (pr)
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pg += POINTERS_PER_PAGE;
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for (j = 0; j < total_pages; j++)
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for (j = 0; j < paging_end; j++)
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{
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if (j >= paging_start && j < lp)
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pg[j + lxs[0]] = page2offset (mfn_list[j]) | 5;
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@ -271,24 +274,12 @@ grub_xen_special_alloc (void)
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}
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static grub_err_t
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grub_xen_boot (void)
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grub_xen_pt_alloc (void)
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{
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grub_relocator_chunk_t ch;
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grub_err_t err;
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grub_uint64_t nr_info_pages;
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grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
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struct gnttab_set_version gnttab_setver;
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grub_size_t i;
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if (grub_xen_n_allocated_shared_pages)
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return grub_error (GRUB_ERR_BUG, "active grants");
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err = grub_xen_p2m_alloc ();
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if (err)
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return err;
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err = grub_xen_special_alloc ();
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if (err)
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return err;
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xen_state.next_start.pt_base =
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xen_state.max_addr + xen_state.xen_inf.virt_base;
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@ -309,32 +300,62 @@ grub_xen_boot (void)
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nr_pages = nr_need_pages;
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}
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grub_dprintf ("xen", "bootstrap domain %llx+%llx\n",
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(unsigned long long) xen_state.xen_inf.virt_base,
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(unsigned long long) page2offset (nr_pages));
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err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
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xen_state.max_addr,
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page2offset (nr_pt_pages));
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if (err)
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return err;
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xen_state.virt_pgtable = get_virtual_current_address (ch);
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xen_state.pgtbl_start = xen_state.max_addr >> PAGE_SHIFT;
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xen_state.max_addr += page2offset (nr_pt_pages);
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xen_state.state.stack =
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xen_state.max_addr + STACK_SIZE + xen_state.xen_inf.virt_base;
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xen_state.state.paging_size = nr_pt_pages;
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xen_state.next_start.nr_pt_frames = nr_pt_pages;
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xen_state.max_addr = page2offset (nr_pages);
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xen_state.pgtbl_end = nr_pages;
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_xen_boot (void)
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{
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grub_err_t err;
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grub_uint64_t nr_pages;
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struct gnttab_set_version gnttab_setver;
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grub_size_t i;
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if (grub_xen_n_allocated_shared_pages)
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return grub_error (GRUB_ERR_BUG, "active grants");
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err = grub_xen_p2m_alloc ();
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if (err)
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return err;
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err = grub_xen_special_alloc ();
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if (err)
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return err;
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err = grub_xen_pt_alloc ();
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if (err)
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return err;
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err = set_mfns (xen_state.console_pfn);
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if (err)
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return err;
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generate_page_table (get_virtual_current_address (ch),
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xen_state.max_addr >> PAGE_SHIFT, nr_pages,
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nr_pages = xen_state.max_addr >> PAGE_SHIFT;
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grub_dprintf ("xen", "bootstrap domain %llx+%llx\n",
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(unsigned long long) xen_state.xen_inf.virt_base,
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(unsigned long long) page2offset (nr_pages));
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generate_page_table (xen_state.virt_pgtable, xen_state.pgtbl_start,
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xen_state.pgtbl_end, nr_pages,
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xen_state.xen_inf.virt_base, xen_state.virt_mfn_list);
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xen_state.max_addr += page2offset (nr_pt_pages);
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xen_state.state.stack =
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xen_state.max_addr + STACK_SIZE + xen_state.xen_inf.virt_base;
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xen_state.state.entry_point = xen_state.xen_inf.entry_point;
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xen_state.next_start.nr_pt_frames = nr_pt_pages;
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xen_state.state.paging_size = nr_pt_pages;
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*xen_state.virt_start_info = xen_state.next_start;
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grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver));
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@ -348,8 +369,8 @@ grub_xen_boot (void)
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return grub_relocator_xen_boot (xen_state.relocator, xen_state.state, nr_pages,
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xen_state.xen_inf.virt_base <
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PAGE_SIZE ? page2offset (nr_pages) : 0,
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nr_pages - 1,
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page2offset (nr_pages - 1) +
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xen_state.pgtbl_end - 1,
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page2offset (xen_state.pgtbl_end - 1) +
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xen_state.xen_inf.virt_base);
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}
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