Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-24 05:02:12 +00:00
Code Issues Packages Projects Releases Wiki Activity

xen: deal with pmd being allocated/freed

Browse Source 
Deal properly with pmd-level pages being allocated and freed
dynamically.  We can handle them more or less the same as pte pages.

Also, deal with early_ioremap pagetable manipulations.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge 2008-01-30 13:33:39 +01:00 committed by Ingo Molnar
parent a5a19c63f4
commit 1c70e9bd83
1 changed files with 25 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
arch/x86/xen/enlighten.c
View File

@ -658,6 +658,13 @@ static __init void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn)
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
}
/* Early release_pt assumes that all pts are pinned, since there's
only init_mm and anything attached to that is pinned. */
static void xen_release_pt_init(u32 pfn)
{
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
}
static void pin_pagetable_pfn(unsigned level, unsigned long pfn)
{
struct mmuext_op op;
@ -669,7 +676,7 @@ static void pin_pagetable_pfn(unsigned level, unsigned long pfn)
/* This needs to make sure the new pte page is pinned iff its being
attached to a pinned pagetable. */
static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
{
struct page *page = pfn_to_page(pfn);
@ -678,7 +685,7 @@ static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
if (!PageHighMem(page)) {
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
pin_pagetable_pfn(level, pfn);
} else
/* make sure there are no stray mappings of
this page */
@ -686,6 +693,16 @@ static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
}
}
static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
{
xen_alloc_ptpage(mm, pfn, MMUEXT_PIN_L1_TABLE);
}
static void xen_alloc_pd(struct mm_struct *mm, u32 pfn)
{
xen_alloc_ptpage(mm, pfn, MMUEXT_PIN_L2_TABLE);
}
/* This should never happen until we're OK to use struct page */
static void xen_release_pt(u32 pfn)
{
@ -788,6 +805,9 @@ static __init void xen_pagetable_setup_done(pgd_t *base)
/* This will work as long as patching hasn't happened yet
(which it hasn't) */
pv_mmu_ops.alloc_pt = xen_alloc_pt;
pv_mmu_ops.alloc_pd = xen_alloc_pd;
pv_mmu_ops.release_pt = xen_release_pt;
pv_mmu_ops.release_pd = xen_release_pt;
pv_mmu_ops.set_pte = xen_set_pte;
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
@ -1011,10 +1031,10 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
.pte_update_defer = paravirt_nop,
.alloc_pt = xen_alloc_pt_init,
.release_pt = xen_release_pt,
.alloc_pd = paravirt_nop,
.release_pt = xen_release_pt_init,
.alloc_pd = xen_alloc_pt_init,
.alloc_pd_clone = paravirt_nop,
.release_pd = paravirt_nop,
.release_pd = xen_release_pt_init,
#ifdef CONFIG_HIGHPTE
.kmap_atomic_pte = xen_kmap_atomic_pte,