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paravirt: add hooks for ptep_modify_prot_start/commit

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This patch adds paravirt-ops hooks in pv_mmu_ops for ptep_modify_prot_start and
ptep_modify_prot_commit.  This allows the hypervisor-specific backends to
implement these in some more efficient way.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-06-16 04:30:01 -07:00
committed by Ingo Molnar
parent 1ea0704e0d
commit 08b882c627
3 changed files with 34 additions and 0 deletions
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3
arch/x86/kernel/paravirt.c
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@@ -380,6 +380,9 @@ struct pv_mmu_ops pv_mmu_ops = {
.pte_update = paravirt_nop, .pte_update = paravirt_nop,
.pte_update_defer = paravirt_nop, .pte_update_defer = paravirt_nop,
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
#ifdef CONFIG_HIGHPTE #ifdef CONFIG_HIGHPTE
.kmap_atomic_pte = kmap_atomic, .kmap_atomic_pte = kmap_atomic,
#endif #endif

3
arch/x86/xen/enlighten.c
View File

@@ -1138,6 +1138,9 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
.set_pte_at = xen_set_pte_at, .set_pte_at = xen_set_pte_at,
.set_pmd = xen_set_pmd_hyper, .set_pmd = xen_set_pmd_hyper,
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
.pte_val = xen_pte_val, .pte_val = xen_pte_val,
.pte_flags = native_pte_val, .pte_flags = native_pte_val,
.pgd_val = xen_pgd_val, .pgd_val = xen_pgd_val,

28
include/asm-x86/paravirt.h
View File

@@ -238,6 +238,11 @@ struct pv_mmu_ops {
void (*pte_update_defer)(struct mm_struct *mm, void (*pte_update_defer)(struct mm_struct *mm,
unsigned long addr, pte_t *ptep); unsigned long addr, pte_t *ptep);
pte_t (*ptep_modify_prot_start)(struct mm_struct *mm, unsigned long addr,
pte_t *ptep);
void (*ptep_modify_prot_commit)(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
pteval_t (*pte_val)(pte_t); pteval_t (*pte_val)(pte_t);
pteval_t (*pte_flags)(pte_t); pteval_t (*pte_flags)(pte_t);
pte_t (*make_pte)(pteval_t pte); pte_t (*make_pte)(pteval_t pte);
@@ -1039,6 +1044,29 @@ static inline pgdval_t pgd_val(pgd_t pgd)
return ret; return ret;
} }
#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pteval_t ret;
ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
mm, addr, ptep);
return (pte_t) { .pte = ret };
}
static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
if (sizeof(pteval_t) > sizeof(long))
/* 5 arg words */
pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
else
PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
mm, addr, ptep, pte.pte);
}
static inline void set_pte(pte_t *ptep, pte_t pte) static inline void set_pte(pte_t *ptep, pte_t pte)
{ {
if (sizeof(pteval_t) > sizeof(long)) if (sizeof(pteval_t) > sizeof(long))