[Xen-devel] [PATCH] x86/shadow: don't pass wrong L4 MFN to guest_walk_tables()

["Jan Beulich" <JBeulich@xxxxxxxx>]

64-bit PV guest user mode runs on a different L4 table. Make sure
- the accessed bit gets set in the correct table (and in log-dirty
  mode the correct page gets marked dirty) during guest walks,
- the correct table gets audited by sh_audit_gw(),
- correct info gets logged by print_gw().

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -180,7 +180,10 @@ sh_walk_guest_tables(struct vcpu *v, uns
                              INVALID_MFN,
                              v->arch.paging.shadow.gl3e
 #else /* 32 or 64 */
-                             pagetable_get_mfn(v->arch.guest_table),
+                             (((v->arch.flags & TF_kernel_mode) ||
+                               is_pv_32bit_vcpu(v))
+                              ? pagetable_get_mfn(v->arch.guest_table)
+                              : pagetable_get_mfn(v->arch.guest_table_user)),
                              v->arch.paging.shadow.guest_vtable
 #endif
                              );



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