x86/altp2m: treat view 0 as the hostp2m in p2m_get_mem_access()

p2m_set_mem_access() (and other places) treat view 0 as the
hostp2m, but p2m_get_mem_access() does not. Correct that
inconsistency.

Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>

diff --git a/xen/arch/x86/mm/mem_access.c b/xen/arch/x86/mm/mem_access.c
index 56c06a4fc6a66cce83c749eeb2ec90f766dccbbe..a144bb0ce494318b0493dcff31bb5e4e8a742969 100644 (file)
--- a/xen/arch/x86/mm/mem_access.c
+++ b/xen/arch/x86/mm/mem_access.c
@@ -505,7 +505,7 @@ int p2m_get_mem_access(struct domain *d, gfn_t gfn, xenmem_access_t *access,
         if ( altp2m_idx )
             return -EINVAL;
     }
-    else
+    else if ( altp2m_idx ) /* altp2m view 0 is treated as the hostp2m */
     {
         if ( altp2m_idx >= MAX_ALTP2M ||
              d->arch.altp2m_eptp[altp2m_idx] == mfn_x(INVALID_MFN) )