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OpenCloudOS-Kernel
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KVM: MMU: cleanup FNAME(invlpg) 

Directly Use mmu_page_zap_pte to zap spte in FNAME(invlpg), also remove the
same code between FNAME(invlpg) and FNAME(sync_page)

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2011-09-22 16:56:06 +08:00 committed by Avi Kivity
parent d01f8d5e02
commit 505aef8f30
2 changed files with 27 additions and 33 deletions
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16
arch/x86/kvm/mmu.c
View File

@ -1809,7 +1809,7 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
}
}
static void mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
static bool mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
u64 *spte)
{
u64 pte;
@ -1817,17 +1817,21 @@ static void mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
pte = *spte;
if (is_shadow_present_pte(pte)) {
if (is_last_spte(pte, sp->role.level))
if (is_last_spte(pte, sp->role.level)) {
drop_spte(kvm, spte);
else {
if (is_large_pte(pte))
--kvm->stat.lpages;
} else {
child = page_header(pte & PT64_BASE_ADDR_MASK);
drop_parent_pte(child, spte);
}
} else if (is_mmio_spte(pte))
return true;
}
if (is_mmio_spte(pte))
mmu_spte_clear_no_track(spte);
if (is_large_pte(pte))
--kvm->stat.lpages;
return false;
}
static void kvm_mmu_page_unlink_children(struct kvm *kvm,

44
arch/x86/kvm/paging_tmpl.h
View File

@ -656,6 +656,18 @@ out_unlock:
return 0;
}
static gpa_t FNAME(get_level1_sp_gpa)(struct kvm_mmu_page *sp)
{
int offset = 0;
WARN_ON(sp->role.level != 1);
if (PTTYPE == 32)
offset = sp->role.quadrant << PT64_LEVEL_BITS;
return gfn_to_gpa(sp->gfn) + offset * sizeof(pt_element_t);
}
static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
{
struct kvm_shadow_walk_iterator iterator;
@ -663,7 +675,6 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
gpa_t pte_gpa = -1;
int level;
u64 *sptep;
int need_flush = 0;
vcpu_clear_mmio_info(vcpu, gva);
@ -675,36 +686,20 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
sp = page_header(__pa(sptep));
if (is_last_spte(*sptep, level)) {
int offset, shift;
if (!sp->unsync)
break;
shift = PAGE_SHIFT -
(PT_LEVEL_BITS - PT64_LEVEL_BITS) * level;
offset = sp->role.quadrant << shift;
pte_gpa = (sp->gfn << PAGE_SHIFT) + offset;
pte_gpa = FNAME(get_level1_sp_gpa)(sp);
pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);
if (is_shadow_present_pte(*sptep)) {
if (is_large_pte(*sptep))
--vcpu->kvm->stat.lpages;
drop_spte(vcpu->kvm, sptep);
need_flush = 1;
} else if (is_mmio_spte(*sptep))
mmu_spte_clear_no_track(sptep);
break;
if (mmu_page_zap_pte(vcpu->kvm, sp, sptep))
kvm_flush_remote_tlbs(vcpu->kvm);
}
if (!is_shadow_present_pte(*sptep) || !sp->unsync_children)
break;
}
if (need_flush)
kvm_flush_remote_tlbs(vcpu->kvm);
atomic_inc(&vcpu->kvm->arch.invlpg_counter);
spin_unlock(&vcpu->kvm->mmu_lock);
@ -769,19 +764,14 @@ static gpa_t FNAME(gva_to_gpa_nested)(struct kvm_vcpu *vcpu, gva_t vaddr,
*/
static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
{
int i, offset, nr_present;
int i, nr_present = 0;
bool host_writable;
gpa_t first_pte_gpa;
offset = nr_present = 0;
/* direct kvm_mmu_page can not be unsync. */
BUG_ON(sp->role.direct);
if (PTTYPE == 32)
offset = sp->role.quadrant << PT64_LEVEL_BITS;
first_pte_gpa = gfn_to_gpa(sp->gfn) + offset * sizeof(pt_element_t);
first_pte_gpa = FNAME(get_level1_sp_gpa)(sp);
for (i = 0; i < PT64_ENT_PER_PAGE; i++) {
unsigned pte_access;