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Subject[PATCH v4 3/6] KVM: MMU: introduce kvm_clear_all_lpage_info
Date
This function is used to reset the large page info of all guest pages
which will be used in later patch

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
---
arch/x86/kvm/x86.c | 25 +++++++++++++++++++++++++
arch/x86/kvm/x86.h | 2 ++
2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 52b4e97..8e4494c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6951,6 +6951,31 @@ static void memslot_set_lpage_disallowed(struct kvm_memory_slot *slot,
}
}

+static void clear_memslot_lpage_info(struct kvm_memory_slot *slot)
+{
+ int i;
+
+ for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
+ int lpages;
+ int level = i + 1;
+
+ lpages = gfn_to_index(slot->base_gfn + slot->npages - 1,
+ slot->base_gfn, level) + 1;
+
+ memset(slot->arch.lpage_info[i - 1], 0,
+ sizeof(*slot->arch.lpage_info[i - 1]));
+ memslot_set_lpage_disallowed(slot, slot->npages, i, lpages);
+ }
+}
+
+void kvm_clear_all_lpage_info(struct kvm *kvm)
+{
+ struct kvm_memory_slot *slot;
+
+ kvm_for_each_memslot(slot, kvm->memslots)
+ clear_memslot_lpage_info(slot);
+}
+
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
int i;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index e224f7a..beae540 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -108,6 +108,8 @@ static inline bool vcpu_match_mmio_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
return false;
}

+void kvm_clear_all_lpage_info(struct kvm *kvm);
+
void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
--
1.7.7.6


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