Commit 46971a2f authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Radim Krčmář

KVM: MMU: skip obsolete sp in for_each_gfn_*()

The obsolete sp should not be used on current vCPUs and should not hurt
vCPU's running, so skip it from for_each_gfn_sp() and
for_each_gfn_indirect_valid_sp()

The side effort is we will double check role.invalid in kvm_mmu_get_page()
but i think it is okay as role is well cached
Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent c54cdf14
...@@ -1909,18 +1909,17 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm, ...@@ -1909,18 +1909,17 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
* since it has been deleted from active_mmu_pages but still can be found * since it has been deleted from active_mmu_pages but still can be found
* at hast list. * at hast list.
* *
* for_each_gfn_indirect_valid_sp has skipped that kind of page and * for_each_gfn_valid_sp() has skipped that kind of pages.
* kvm_mmu_get_page(), the only user of for_each_gfn_sp(), has skipped
* all the obsolete pages.
*/ */
#define for_each_gfn_sp(_kvm, _sp, _gfn) \ #define for_each_gfn_valid_sp(_kvm, _sp, _gfn) \
hlist_for_each_entry(_sp, \ hlist_for_each_entry(_sp, \
&(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \ &(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \
if ((_sp)->gfn != (_gfn)) {} else if ((_sp)->gfn != (_gfn) || is_obsolete_sp((_kvm), (_sp)) \
|| (_sp)->role.invalid) {} else
#define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \ #define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \
for_each_gfn_sp(_kvm, _sp, _gfn) \ for_each_gfn_valid_sp(_kvm, _sp, _gfn) \
if ((_sp)->role.direct || (_sp)->role.invalid) {} else if ((_sp)->role.direct) {} else
/* @sp->gfn should be write-protected at the call site */ /* @sp->gfn should be write-protected at the call site */
static bool __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, static bool __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
...@@ -1961,6 +1960,11 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { } ...@@ -1961,6 +1960,11 @@ static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { }
static void mmu_audit_disable(void) { } static void mmu_audit_disable(void) { }
#endif #endif
static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
{
return unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen);
}
static bool kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, static bool kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct list_head *invalid_list) struct list_head *invalid_list)
{ {
...@@ -2105,11 +2109,6 @@ static void clear_sp_write_flooding_count(u64 *spte) ...@@ -2105,11 +2109,6 @@ static void clear_sp_write_flooding_count(u64 *spte)
__clear_sp_write_flooding_count(sp); __clear_sp_write_flooding_count(sp);
} }
static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
{
return unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen);
}
static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
gfn_t gfn, gfn_t gfn,
gva_t gaddr, gva_t gaddr,
...@@ -2136,10 +2135,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, ...@@ -2136,10 +2135,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
role.quadrant = quadrant; role.quadrant = quadrant;
} }
for_each_gfn_sp(vcpu->kvm, sp, gfn) { for_each_gfn_valid_sp(vcpu->kvm, sp, gfn) {
if (is_obsolete_sp(vcpu->kvm, sp))
continue;
if (!need_sync && sp->unsync) if (!need_sync && sp->unsync)
need_sync = true; need_sync = true;
......
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