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-rw-r--r--kvm/user/test/x86/vm.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kvm/user/test/x86/vm.c b/kvm/user/test/x86/vm.c
index 03c73546b..ec9c1458a 100644
--- a/kvm/user/test/x86/vm.c
+++ b/kvm/user/test/x86/vm.c
@@ -189,6 +189,9 @@ static void setup_mmu(unsigned long len)
unsigned long *cr3 = alloc_page();
unsigned long phys = 0;
+ if (len < (1ul << 32))
+ len = 1ul << 32; /* map mmio 1:1 */
+
memset(cr3, 0, PAGE_SIZE);
while (phys + LARGE_PAGE_SIZE <= len) {
install_large_page(cr3, phys, (void *)phys);