KVM: MMU: Trace guest pagetable walker

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 53e129cec5fd..36ac6d70a847 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -125,13 +125,15 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
         gpa_t pte_gpa;
         int rsvd_fault = 0;
 
-        pgprintk("%s: addr %lx\n", __func__, addr);
+        trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault,
+                                     fetch_fault);
 walk:
         walker->level = vcpu->arch.mmu.root_level;
         pte = vcpu->arch.cr3;
 #if PTTYPE == 64
         if (!is_long_mode(vcpu)) {
                 pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3);
+                trace_kvm_mmu_paging_element(pte, walker->level);
                 if (!is_present_gpte(pte))
                         goto not_present;
                 --walker->level;
@@ -150,10 +152,9 @@ walk:
                 pte_gpa += index * sizeof(pt_element_t);
                 walker->table_gfn[walker->level - 1] = table_gfn;
                 walker->pte_gpa[walker->level - 1] = pte_gpa;
-                pgprintk("%s: table_gfn[%d] %lx\n", __func__,
-                         walker->level - 1, table_gfn);
 
                 kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte));
+                trace_kvm_mmu_paging_element(pte, walker->level);
 
                 if (!is_present_gpte(pte))
                         goto not_present;
@@ -175,6 +176,8 @@ walk:
 #endif
 
                 if (!(pte & PT_ACCESSED_MASK)) {
+                        trace_kvm_mmu_set_accessed_bit(table_gfn, index,
+                                                       sizeof(pte));
                         mark_page_dirty(vcpu->kvm, table_gfn);
                         if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn,
                             index, pte, pte|PT_ACCESSED_MASK))
@@ -208,6 +211,7 @@ walk:
         if (write_fault && !is_dirty_gpte(pte)) {
                 bool ret;
 
+                trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte));
                 mark_page_dirty(vcpu->kvm, table_gfn);
                 ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte,
                             pte|PT_DIRTY_MASK);
@@ -239,6 +243,7 @@ err:
                 walker->error_code |= PFERR_FETCH_MASK;
         if (rsvd_fault)
                 walker->error_code |= PFERR_RSVD_MASK;
+        trace_kvm_mmu_walker_error(walker->error_code);
         return 0;
 }