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#include "kvm.h"
#include <linux/types.h>
bool
__untrack_single_page(struct kvm_vcpu *vcpu, gfn_t gfn,
enum kvm_page_track_mode mode)
{
int idx;
bool ret;
struct kvm_memory_slot *slot;
ret = false;
idx = srcu_read_lock(&vcpu->kvm->srcu);
if (mode == KVM_PAGE_TRACK_ACCESS) {
//printk("Removing gfn: %016llx from acess page track pool\n", gfn);
}
if (mode == KVM_PAGE_TRACK_WRITE) {
//printk("Removing gfn: %016llx from write page track pool\n", gfn);
}
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
if (slot != NULL && kvm_slot_page_track_is_active(vcpu->kvm, slot, gfn, mode)) {
write_lock(&vcpu->kvm->mmu_lock);
kvm_slot_page_track_remove_page(vcpu->kvm, slot, gfn, mode);
write_unlock(&vcpu->kvm->mmu_lock);
ret = true;
} else {
printk("Failed to untrack %016llx because ", gfn);
if (slot == NULL) {
printk(KERN_CONT "slot was null");
} else if (!kvm_slot_page_track_is_active(vcpu->kvm, slot, gfn, mode)) {
printk(KERN_CONT "page track was not active");
}
printk(KERN_CONT "\n");
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
return ret;
}
EXPORT_SYMBOL(__untrack_single_page);
bool
__reset_accessed_on_page(struct kvm_vcpu *vcpu, gfn_t gfn)
{
int idx;
bool ret;
struct kvm_memory_slot *slot;
ret = false;
idx = srcu_read_lock(&vcpu->kvm->srcu);
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
if( slot != NULL ) {
write_lock(&vcpu->kvm->mmu_lock);
//Vincent: The kvm mmu function now requires min_level
//We want all pages to protected so we do PG_LEVEL_4K
//https://patchwork.kernel.org/project/kvm/patch/20210416082511.2856-2-zhukeqian1@huawei.com/
sevstep_kvm_mmu_slot_gfn_protect(vcpu->kvm,slot,gfn,PG_LEVEL_4K,KVM_PAGE_TRACK_RESET_ACCESSED);
write_unlock(&vcpu->kvm->mmu_lock);
ret = true;
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
return ret;
}
EXPORT_SYMBOL(__reset_accessed_on_page);
bool
__clear_nx_on_page(struct kvm_vcpu *vcpu, gfn_t gfn)
{
int idx;
bool ret;
struct kvm_memory_slot *slot;
ret = false;
idx = srcu_read_lock(&vcpu->kvm->srcu);
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
if( slot != NULL ) {
write_lock(&vcpu->kvm->mmu_lock);
//Vincent: The kvm mmu function now requires min_level
//We want all pages to protected so we do PG_LEVEL_4K
//https://patchwork.kernel.org/project/kvm/patch/20210416082511.2856-2-zhukeqian1@huawei.com/
sevstep_kvm_mmu_slot_gfn_protect(vcpu->kvm, slot, gfn,
PG_LEVEL_4K, KVM_PAGE_TRACK_RESET_EXEC);
write_unlock(&vcpu->kvm->mmu_lock);
ret = true;
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
return ret;
}
EXPORT_SYMBOL(__clear_nx_on_page);
bool
__track_single_page(struct kvm_vcpu *vcpu, gfn_t gfn,
enum kvm_page_track_mode mode)
{
int idx;
bool ret;
struct kvm_memory_slot *slot;
ret = false;
idx = srcu_read_lock(&vcpu->kvm->srcu);
if (mode == KVM_PAGE_TRACK_ACCESS) {
//printk_ratelimited("Adding gfn: %016llx to acess page track pool\n", gfn);
//printk("Adding gfn: %016llx to acess page track pool\n", gfn);
}
if (mode == KVM_PAGE_TRACK_WRITE) {
//printk_ratelimited("Adding gfn: %016llx to write page track pool\n", gfn);
}
slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
if (slot != NULL && !kvm_slot_page_track_is_active(vcpu->kvm,slot, gfn, mode)) {
write_lock(&vcpu->kvm->mmu_lock);
kvm_slot_page_track_add_page(vcpu->kvm, slot, gfn, mode);
write_unlock(&vcpu->kvm->mmu_lock);
ret = true;
} else {
printk("Failed to track %016llx because ", gfn);
if (slot == NULL) {
printk(KERN_CONT "slot was null");
}
if (kvm_slot_page_track_is_active(vcpu->kvm, slot, gfn, mode)) {
printk(KERN_CONT "page is already tracked");
}
printk(KERN_CONT "\n");
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
return ret;
}
EXPORT_SYMBOL(__track_single_page);
long
kvm_start_tracking(struct kvm_vcpu *vcpu,enum kvm_page_track_mode mode )
{
long count = 0;
u64 iterator, iterat_max;
struct kvm_memory_slot *slot;
int idx;
//Vincent: Memslots interface changed into a rb tree, see
//here: https://lwn.net/Articles/856392/
//and here: https://lore.kernel.org/all/cover.1632171478.git.maciej.szmigiero@oracle.com/T/#u
//Thus we use instead of
//iterat_max = vcpu->kvm->memslots[0]->memslots[0].base_gfn
// + vcpu->kvm->memslots[0]->memslots[0].npages;
struct rb_node *node;
struct kvm_memory_slot *first_memslot;
node = rb_last(&(vcpu->kvm->memslots[0]->gfn_tree));
first_memslot = container_of(node, struct kvm_memory_slot, gfn_node[0]);
iterat_max = first_memslot->base_gfn + first_memslot->npages;
for (iterator=0; iterator < iterat_max; iterator++)
{
idx = srcu_read_lock(&vcpu->kvm->srcu);
slot = kvm_vcpu_gfn_to_memslot(vcpu, iterator);
if ( slot != NULL && !kvm_slot_page_track_is_active(vcpu->kvm, slot, iterator, mode)) {
write_lock(&vcpu->kvm->mmu_lock);
kvm_slot_page_track_add_page(vcpu->kvm, slot, iterator, mode);
write_unlock(&vcpu->kvm->mmu_lock);
count++;
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
}
return count;
}
EXPORT_SYMBOL(kvm_start_tracking);
long
kvm_stop_tracking(struct kvm_vcpu *vcpu,enum kvm_page_track_mode mode)
{
long count = 0;
u64 iterator, iterat_max;
struct kvm_memory_slot *slot;
int idx;
//Vincent: Memslots interface changed into a rb tree, see
//here: https://lwn.net/Articles/856392/
//and here: https://lore.kernel.org/all/cover.1632171478.git.maciej.szmigiero@oracle.com/T/#u
//Thus we use instead of
//iterat_max = vcpu->kvm->memslots[0]->memslots[0].base_gfn
// + vcpu->kvm->memslots[0]->memslots[0].npages;
struct rb_node *node;
struct kvm_memory_slot *first_memslot;
node = rb_last(&(vcpu->kvm->memslots[0]->gfn_tree));
first_memslot = container_of(node, struct kvm_memory_slot, gfn_node[0]);
iterat_max = first_memslot->base_gfn + first_memslot->npages;
for (iterator=0; iterator < iterat_max; iterator++)
{
idx = srcu_read_lock(&vcpu->kvm->srcu);
slot = kvm_vcpu_gfn_to_memslot(vcpu, iterator);
//Vincent: I think see here https://patchwork.kernel.org/project/kvm/patch/20210924163152.289027-22-pbonzini@redhat.com/
if ( slot != NULL && kvm_slot_page_track_is_active(vcpu->kvm, slot, iterator, mode)) {
write_lock(&vcpu->kvm->mmu_lock);
kvm_slot_page_track_remove_page(vcpu->kvm, slot, iterator, mode);
write_unlock(&vcpu->kvm->mmu_lock);
count++;
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
}
return count;
}
EXPORT_SYMBOL(kvm_stop_tracking);
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