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KVM: MMU: Add link_shadow_page() helper

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To simplify the process of fetching an spte, add a helper that links
a shadow page to an spte.

Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-07-13 14:27:04 +03:00
parent 4a994358b9
commit 32ef26a359
2 changed files with 12 additions and 5 deletions
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10
arch/x86/kvm/mmu.c
View File

@ -1482,6 +1482,16 @@ static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator)
--iterator->level; --iterator->level;
} }
static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp)
{
u64 spte;
spte = __pa(sp->spt)
| PT_PRESENT_MASK | PT_ACCESSED_MASK
| PT_WRITABLE_MASK | PT_USER_MASK;
*sptep = spte;
}
static void kvm_mmu_page_unlink_children(struct kvm *kvm, static void kvm_mmu_page_unlink_children(struct kvm *kvm,
struct kvm_mmu_page *sp) struct kvm_mmu_page *sp)
{ {

7
arch/x86/kvm/paging_tmpl.h
View File

@ -309,7 +309,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
{ {
unsigned access = gw->pt_access; unsigned access = gw->pt_access;
struct kvm_mmu_page *sp; struct kvm_mmu_page *sp;
u64 spte, *sptep = NULL; u64 *sptep = NULL;
int direct; int direct;
gfn_t table_gfn; gfn_t table_gfn;
int r; int r;
@ -395,10 +395,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
} }
} }
spte = __pa(sp->spt) link_shadow_page(sptep, sp);
| PT_PRESENT_MASK | PT_ACCESSED_MASK
| PT_WRITABLE_MASK | PT_USER_MASK;
*sptep = spte;
} }
return sptep; return sptep;