[Xen-devel] [PATCH v2 2/3] nested vmx: synchronize page fault error code match and mask

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

Page fault is specially handled not only with exception bitmaps,
but also with consideration of page fault error code mask/match
values. Therefore in nested virtualization case, the two values
need to be synchronized from virtual VMCS to shadow VMCS.

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 16fb3fd..0f13884 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -603,6 +603,17 @@ static void nvmx_update_tpr_threshold(struct vcpu *v)
         __vmwrite(TPR_THRESHOLD, 0);
 }
 
+static void nvmx_update_pfec(struct vcpu *v)
+{
+    struct nestedvcpu *nvcpu = &vcpu_nestedhvm(v);
+    void *vvmcs = nvcpu->nv_vvmcx;
+
+    __vmwrite(PAGE_FAULT_ERROR_CODE_MASK,
+        __get_vvmcs(vvmcs, PAGE_FAULT_ERROR_CODE_MASK));
+    __vmwrite(PAGE_FAULT_ERROR_CODE_MATCH,
+        __get_vvmcs(vvmcs, PAGE_FAULT_ERROR_CODE_MATCH));
+}
+
 static void __clear_current_vvmcs(struct vcpu *v)
 {
     struct nestedvcpu *nvcpu = &vcpu_nestedhvm(v);
@@ -813,6 +824,7 @@ static void load_shadow_control(struct vcpu *v)
     nvmx_update_apic_access_address(v);
     nvmx_update_virtual_apic_address(v);
     nvmx_update_tpr_threshold(v);
+    nvmx_update_pfec(v);
 }
 
 static void load_shadow_guest_state(struct vcpu *v)
-- 
1.7.1


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