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xen: refactor xen_{alloc,release}_{pt,pd}()

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Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Cc: xen-devel@lists.xensource.com
Cc: Mark McLoughlin <markmc@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mark McLoughlin 2008-04-02 15:36:36 +01:00 committed by Ingo Molnar
parent 8f59610de2
commit f64337062c
3 changed files with 27 additions and 14 deletions
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27
arch/x86/xen/enlighten.c
View File

@ -667,10 +667,10 @@ 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)
static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
{
struct mmuext_op op;
op.cmd = level;
op.cmd = cmd;
op.arg1.mfn = pfn_to_mfn(pfn);
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
BUG();
@ -687,7 +687,10 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
if (!PageHighMem(page)) {
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
pin_pagetable_pfn(level, pfn);
if (level == PT_PTE)
pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
else if (level == PT_PMD)
pin_pagetable_pfn(MMUEXT_PIN_L2_TABLE, pfn);
} else
/* make sure there are no stray mappings of
this page */
@ -697,16 +700,16 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
{
xen_alloc_ptpage(mm, pfn, MMUEXT_PIN_L1_TABLE);
xen_alloc_ptpage(mm, pfn, PT_PTE);
}
static void xen_alloc_pd(struct mm_struct *mm, u32 pfn)
{
xen_alloc_ptpage(mm, pfn, MMUEXT_PIN_L2_TABLE);
xen_alloc_ptpage(mm, pfn, PT_PMD);
}
/* This should never happen until we're OK to use struct page */
static void xen_release_pt(u32 pfn)
static void xen_release_ptpage(u32 pfn, unsigned level)
{
struct page *page = pfn_to_page(pfn);
@ -718,6 +721,16 @@ static void xen_release_pt(u32 pfn)
}
}
static void xen_release_pt(u32 pfn)
{
xen_release_ptpage(pfn, PT_PTE);
}
static void xen_release_pd(u32 pfn)
{
xen_release_ptpage(pfn, PT_PMD);
}
#ifdef CONFIG_HIGHPTE
static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
{
@ -838,7 +851,7 @@ static __init void xen_pagetable_setup_done(pgd_t *base)
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.release_pd = xen_release_pd;
pv_mmu_ops.set_pte = xen_set_pte;
setup_shared_info();

7
arch/x86/xen/mmu.c
View File

@ -310,13 +310,6 @@ pgd_t xen_make_pgd(unsigned long pgd)
}
#endif /* CONFIG_X86_PAE */
enum pt_level {
PT_PGD,
PT_PUD,
PT_PMD,
PT_PTE
};
/*
(Yet another) pagetable walker. This one is intended for pinning a
pagetable. This means that it walks a pagetable and calls the

7
arch/x86/xen/mmu.h
View File

@ -3,6 +3,13 @@
#include <linux/linkage.h>
#include <asm/page.h>
enum pt_level {
PT_PGD,
PT_PUD,
PT_PMD,
PT_PTE
};
/*
* Page-directory addresses above 4GB do not fit into architectural %cr3.
* When accessing %cr3, or equivalent field in vcpu_guest_context, guests