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KVM: nVMX: Copy processor-specific shadow-vmcs to VMCS12

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Introduce a function used to copy fields from the processor-specific shadow
vmcs to the software controlled VMCS12

Signed-off-by: Abel Gordon <abelg@il.ibm.com>
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Abel Gordon 2013-04-18 14:38:25 +03:00 committed by Gleb Natapov
parent e7953d7fab
commit 16f5b9034b
1 changed files with 35 additions and 0 deletions
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35
arch/x86/kvm/vmx.c
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@ -718,6 +718,7 @@ static void vmx_get_segment(struct kvm_vcpu *vcpu,
static bool guest_state_valid(struct kvm_vcpu *vcpu);
static u32 vmx_segment_access_rights(struct kvm_segment *var);
static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu);
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);
@ -5895,6 +5896,40 @@ static inline bool vmcs12_write_any(struct kvm_vcpu *vcpu,
}
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.