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xen: factor out allocation of special pages into separate function

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Do the allocation of special pages (start info, console and xenbus
ring buffers) 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 2016-03-03 10:38:12 +01:00 committed by Daniel Kiper
parent c221ea06b5
commit 1fbb2b4b39
1 changed files with 37 additions and 23 deletions
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60
grub-core/loader/i386/xen.c
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@ -48,6 +48,8 @@ struct xen_loader_state {
struct start_info next_start;
struct grub_xen_file_info xen_inf;
grub_xen_mfn_t *virt_mfn_list;
struct start_info *virt_start_info;
grub_xen_mfn_t console_pfn;
grub_uint64_t max_addr;
struct xen_multiboot_mod_list *module_info_page;
grub_uint64_t modules_target_start;
@ -239,12 +241,40 @@ grub_xen_p2m_alloc (void)
return GRUB_ERR_NONE;
}
static grub_err_t
grub_xen_special_alloc (void)
{
grub_relocator_chunk_t ch;
grub_err_t err;
err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
xen_state.max_addr,
sizeof (xen_state.next_start));
if (err)
return err;
xen_state.state.start_info = xen_state.max_addr + xen_state.xen_inf.virt_base;
xen_state.virt_start_info = get_virtual_current_address (ch);
xen_state.max_addr =
ALIGN_UP (xen_state.max_addr + sizeof (xen_state.next_start), PAGE_SIZE);
xen_state.console_pfn = xen_state.max_addr >> PAGE_SHIFT;
xen_state.max_addr += 2 * PAGE_SIZE;
xen_state.next_start.nr_pages = grub_xen_start_page_addr->nr_pages;
grub_memcpy (xen_state.next_start.magic, grub_xen_start_page_addr->magic,
sizeof (xen_state.next_start.magic));
xen_state.next_start.store_mfn = grub_xen_start_page_addr->store_mfn;
xen_state.next_start.store_evtchn = grub_xen_start_page_addr->store_evtchn;
xen_state.next_start.console.domU = grub_xen_start_page_addr->console.domU;
xen_state.next_start.shared_info = grub_xen_start_page_addr->shared_info;
return GRUB_ERR_NONE;
}
static grub_err_t
grub_xen_boot (void)
{
grub_relocator_chunk_t ch;
grub_err_t err;
struct start_info *nst;
grub_uint64_t nr_info_pages;
grub_uint64_t nr_pages, nr_pt_pages, nr_need_pages;
struct gnttab_set_version gnttab_setver;
@ -256,29 +286,9 @@ grub_xen_boot (void)
err = grub_xen_p2m_alloc ();
if (err)
return err;
err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
xen_state.max_addr,
sizeof (xen_state.next_start));
err = grub_xen_special_alloc ();
if (err)
return err;
xen_state.state.start_info = xen_state.max_addr + xen_state.xen_inf.virt_base;
nst = get_virtual_current_address (ch);
xen_state.max_addr =
ALIGN_UP (xen_state.max_addr + sizeof (xen_state.next_start), PAGE_SIZE);
xen_state.next_start.nr_pages = grub_xen_start_page_addr->nr_pages;
grub_memcpy (xen_state.next_start.magic, grub_xen_start_page_addr->magic,
sizeof (xen_state.next_start.magic));
xen_state.next_start.store_mfn = grub_xen_start_page_addr->store_mfn;
xen_state.next_start.store_evtchn = grub_xen_start_page_addr->store_evtchn;
xen_state.next_start.console.domU = grub_xen_start_page_addr->console.domU;
xen_state.next_start.shared_info = grub_xen_start_page_addr->shared_info;
err = set_mfns (xen_state.max_addr >> PAGE_SHIFT);
if (err)
return err;
xen_state.max_addr += 2 * PAGE_SIZE;
xen_state.next_start.pt_base =
xen_state.max_addr + xen_state.xen_inf.virt_base;
@ -309,6 +319,10 @@ grub_xen_boot (void)
if (err)
return err;
err = set_mfns (xen_state.console_pfn);
if (err)
return err;
generate_page_table (get_virtual_current_address (ch),
xen_state.max_addr >> PAGE_SHIFT, nr_pages,
xen_state.xen_inf.virt_base, xen_state.virt_mfn_list);
@ -321,7 +335,7 @@ grub_xen_boot (void)
xen_state.next_start.nr_pt_frames = nr_pt_pages;
xen_state.state.paging_size = nr_pt_pages;
*nst = xen_state.next_start;
*xen_state.virt_start_info = xen_state.next_start;
grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver));