This function is used to reset the rmaps and page info of all guest page
which will be used in later patch
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/x86.c | 31 +++++++++++++++++++++++++++++++
include/linux/kvm_host.h | 1 +
2 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2cf3722..3cb7685 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6881,6 +6881,37 @@ memslot_set_lpage_disallowed(struct kvm_memory_slot *slot,
}
}
+static void clear_memslot_page_info(struct kvm_memory_slot *slot)
+{
+ int i;
+
+ for (i = 0; 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.rmap[i], 0,
+ lpages * sizeof(*slot->arch.rmap[i]));
+
+ if (i) {
+ 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_gfn_page_info(struct kvm *kvm)
+{
+ struct kvm_memory_slot *slot;
+
+ kvm_for_each_memslot(slot, kvm->memslots)
+ clear_memslot_page_info(slot);
+}
+
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
int i;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9fa13eb..449126f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -490,6 +490,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem);
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont);
+void kvm_clear_all_gfn_page_info(struct kvm *kvm);
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages);
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
--
1.7.7.6
--
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