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#include "sevstep.h"
#include "svm/cachepc/cachepc.h"
#include "mmu/mmu_internal.h"
#include "mmu.h"
#include "irq.h"
#include "ioapic.h"
#include "mmu.h"
#include "mmu/tdp_mmu.h"
#include "x86.h"
#include "kvm_cache_regs.h"
#include "kvm_emulate.h"
#include "cpuid.h"
#include "mmu/spte.h"
#include <linux/kvm_host.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/moduleparam.h>
#include <linux/export.h>
#include <linux/swap.h>
#include <linux/hugetlb.h>
#include <linux/compiler.h>
#include <linux/srcu.h>
#include <linux/slab.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#include <linux/hash.h>
#include <linux/kern_levels.h>
#include <linux/kthread.h>
#include <linux/sev.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include "kvm_cache_regs.h"
#include "svm/svm.h"
struct kvm* main_vm;
EXPORT_SYMBOL(main_vm);
bool
sevstep_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) {
pr_warn("Adding gfn: %016llx to access page track pool\n", gfn);
}
if (mode == KVM_PAGE_TRACK_WRITE) {
pr_warn("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 {
pr_warn("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(sevstep_track_single_page);
bool
sevstep_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) {
pr_warn("Removing gfn: %016llx from acess page track pool\n", gfn);
}
if (mode == KVM_PAGE_TRACK_WRITE) {
pr_warn("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 {
pr_warn("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(sevstep_untrack_single_page);
bool
sevstep_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(sevstep_reset_accessed_on_page);
bool
sevstep_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(sevstep_clear_nx_on_page);
long
sevstep_start_tracking(struct kvm_vcpu *vcpu, enum kvm_page_track_mode mode)
{
struct kvm_memory_slot *slot;
struct kvm_memory_slot *first_memslot;
struct rb_node *node;
u64 iterator, iterat_max;
long count = 0;
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;
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(sevstep_start_tracking);
long
sevstep_stop_tracking(struct kvm_vcpu *vcpu, enum kvm_page_track_mode mode)
{
struct kvm_memory_slot *slot;
struct kvm_memory_slot *first_memslot;
struct rb_node *node;
u64 iterator, iterat_max;
long count = 0;
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;
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(sevstep_stop_tracking);
int
sevstep_get_rip_kvm_vcpu(struct kvm_vcpu *vcpu, uint64_t *rip)
{
return 0;
}
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