Introduce a function used to copy fields from the processor-specific shadow
vmcs to the software controlled VMCS12
Signed-off-by: Abel Gordon <abelg@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
--- .before/arch/x86/kvm/vmx.c 2013-03-10 18:00:55.000000000 +0200
+++ .after/arch/x86/kvm/vmx.c 2013-03-10 18:00:55.000000000 +0200
@@ -672,6 +672,7 @@ static void vmx_get_segment(struct kvm_v
struct kvm_segment *var, int seg);
static bool guest_state_valid(struct kvm_vcpu *vcpu);
static u32 vmx_segment_access_rights(struct kvm_segment *var);
+static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx);
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
@@ -5778,6 +5779,40 @@ static inline bool vmcs12_write_any(stru
}
+static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx)
+{
+ int i;
+ unsigned long field;
+ u64 field_value;
+ struct vmcs *shadow_vmcs = vmx->nested.current_shadow_vmcs;
+ unsigned long *fields = (unsigned long *)shadow_read_write_fields;
+ int num_fields = max_shadow_read_write_fields;
+
+ vmcs_load(shadow_vmcs);
+
+ for (i = 0; i < num_fields; i++) {
+ field = fields[i];
+ switch (vmcs_field_type(field)) {
+ case VMCS_FIELD_TYPE_U16:
+ field_value = vmcs_read16(field);
+ break;
+ case VMCS_FIELD_TYPE_U32:
+ field_value = vmcs_read32(field);
+ break;
+ case VMCS_FIELD_TYPE_U64:
+ field_value = vmcs_read64(field);
+ break;
+ case VMCS_FIELD_TYPE_NATURAL_WIDTH:
+ field_value = vmcs_readl(field);
+ break;
+ }
+ vmcs12_write_any(&vmx->vcpu, field, field_value);
+ }
+
+ vmcs_clear(shadow_vmcs);
+ vmcs_load(vmx->loaded_vmcs->vmcs);
+}
+
/*
* VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
* used before) all generate the same failure when it is missing.
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