diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2009-06-10 12:27:03 -0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-10 08:32:53 +0300 |
| commit | 776e6633363b5616be6fa4493a8b70ef8e2ea04b (patch) | |
| tree | 07c0c2547f681330b600f82e860d3e74192532d5 /arch | |
| parent | 3f5d18a96577fd78277e08c467041573b9a65eaf (diff) | |
| download | linux-776e6633363b5616be6fa4493a8b70ef8e2ea04b.tar.bz2 | |
KVM: MMU: introduce is_last_spte helper
Hiding some of the last largepage / level interaction (which is useful
for gbpages and for zero based levels).
Also merge the PT_PAGE_TABLE_LEVEL clearing loop in unlink_children.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index b6e4cda77047..f85d9953a620 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -250,6 +250,15 @@ static int is_rmap_spte(u64 pte) return is_shadow_present_pte(pte); } +static int is_last_spte(u64 pte, int level) +{ + if (level == PT_PAGE_TABLE_LEVEL) + return 1; + if (level == PT_DIRECTORY_LEVEL && is_large_pte(pte)) + return 1; + return 0; +} + static pfn_t spte_to_pfn(u64 pte) { return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; @@ -1313,25 +1322,17 @@ static void kvm_mmu_page_unlink_children(struct kvm *kvm, pt = sp->spt; - if (sp->role.level == PT_PAGE_TABLE_LEVEL) { - for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { - if (is_shadow_present_pte(pt[i])) - rmap_remove(kvm, &pt[i]); - pt[i] = shadow_trap_nonpresent_pte; - } - return; - } - for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { ent = pt[i]; if (is_shadow_present_pte(ent)) { - if (!is_large_pte(ent)) { + if (!is_last_spte(ent, sp->role.level)) { ent &= PT64_BASE_ADDR_MASK; mmu_page_remove_parent_pte(page_header(ent), &pt[i]); } else { - --kvm->stat.lpages; + if (is_large_pte(ent)) + --kvm->stat.lpages; rmap_remove(kvm, &pt[i]); } } @@ -2381,8 +2382,7 @@ static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu, pte = *spte; if (is_shadow_present_pte(pte)) { - if (sp->role.level == PT_PAGE_TABLE_LEVEL || - is_large_pte(pte)) + if (is_last_spte(pte, sp->role.level)) rmap_remove(vcpu->kvm, spte); else { child = page_header(pte & PT64_BASE_ADDR_MASK); |