1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 8eb49e055ec0..27a3318fa6c2 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -26,6 +26,7 @@
 #include <linux/mm.h>
 #include <linux/highmem.h>
 #include <linux/sched.h>
+#include <linux/moduleparam.h>
 
 #include <asm/io.h>
 #include <asm/desc.h>
@@ -33,6 +34,9 @@
 MODULE_AUTHOR("Qumranet");
 MODULE_LICENSE("GPL");
 
+static int bypass_guest_pf = 1;
+module_param(bypass_guest_pf, bool, 0);
+
 struct vmcs {
         u32 revision_id;
         u32 abort;
@@ -1535,8 +1539,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
         }
         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
 
-        vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
-        vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
+        vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
+        vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
         vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */
 
         vmcs_writel(HOST_CR0, read_cr0());  /* 22.2.3 */
@@ -2582,6 +2586,9 @@ static int __init vmx_init(void)
         if (r)
                 goto out1;
 
+        if (bypass_guest_pf)
+                kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
+
         return 0;
 
 out1: