On Sun, Mar 10, 2013 at 06:07:56PM +0200, Abel Gordon wrote:
> Introduce a function used to copy fields from the software controlled VMCS12
> to the processor-specific shadow vmcs
>
> Signed-off-by: Abel Gordon <[email protected]>
> ---
> arch/x86/kvm/vmx.c | 45 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 45 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_vmcs12_to_shadow(struct vcpu_vmx *vmx);
> static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx);
>
> static DEFINE_PER_CPU(struct vmcs *, vmxarea);
> @@ -5813,6 +5814,50 @@ static void copy_shadow_to_vmcs12(struct
> vmcs_load(vmx->loaded_vmcs->vmcs);
> }
>
> +static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
> +{
> + int num_lists = 2;
int num_lists = ARRAY_SIZE(fields)
> + unsigned long *fields[] = {
> + (unsigned long *)shadow_read_write_fields,
> + (unsigned long *)shadow_read_only_fields
> + };
> + int max_fields[] = {
> + max_shadow_read_write_fields,
> + max_shadow_read_only_fields
> + };
> + int i, q;
> + unsigned long field;
> + u64 field_value = 0;
> + struct vmcs *shadow_vmcs = vmx->nested.current_shadow_vmcs;
> +
> + vmcs_load(shadow_vmcs);
> +
> + for (q = 0; q < num_lists; q++) {
> + for (i = 0; i < max_fields[q]; i++) {
> + field = fields[q][i];
> + vmcs12_read_any(&vmx->vcpu, field, &field_value);
> +
> + switch (vmcs_field_type(field)) {
> + case VMCS_FIELD_TYPE_U16:
> + vmcs_write16(field, (u16)field_value);
> + break;
> + case VMCS_FIELD_TYPE_U32:
> + vmcs_write32(field, (u32)field_value);
> + break;
> + case VMCS_FIELD_TYPE_U64:
> + vmcs_write64(field, (u64)field_value);
> + break;
> + case VMCS_FIELD_TYPE_NATURAL_WIDTH:
> + vmcs_writel(field, (long)field_value);
> + break;
> + }
> + }
> + }
> +
> + 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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--
Gleb.
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